Re: [PATCH V11 09/22] LoongArch: Add boot and setup routines

From: Huacai Chen
Date: Wed May 18 2022 - 12:09:05 EST

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In reply to: WANG Xuerui: "Re: [PATCH V11 09/22] LoongArch: Add boot and setup routines"
Next in thread: Ard Biesheuvel: "Re: [PATCH V11 09/22] LoongArch: Add boot and setup routines"
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Hi, Xuerui,

On Wed, May 18, 2022 at 11:18 PM WANG Xuerui <kernel@xxxxxxxxxx> wrote:
>
> On 5/18/22 17:26, Huacai Chen wrote:
> > Add basic boot, setup and reset routines for LoongArch. Now, LoongArch
> > machines use UEFI-based firmware. The firmware passes configuration
> > information to the kernel via ACPI and DMI/SMBIOS.
> >
> > Currently an existing interface between the kernel and the bootloader
> > is implemented. Kernel gets 2 values from the bootloader, passed in
> Nit: one extra space after "is".
OK, thanks.

> > registers a0 and a1; a0 is an "EFI boot flag" distinguishing UEFI and
> > non-UEFI firmware, while a1 is a pointer to an FDT with systable,
> > memmap, cmdline and initrd information.
> >
> > This interface is used by existing bootloaders for booting kernels in
> > raw ELF format. However, the standard UEFI boot protocol (EFISTUB) is
> > preferred.
> >
> > ECR for adding LoongArch support in ACPI:
> > https://mantis.uefi.org/mantis/view.php?id=2203
> >
> > ECR for adding LoongArch support in ACPI (version update):
> > https://mantis.uefi.org/mantis/view.php?id=2268
> >
> > ECR for adding LoongArch support in UEFI:
> > https://mantis.uefi.org/mantis/view.php?id=2313
> >
> > ACPI changes of LoongArch have been approved in the last year, but the
> > new version of ACPI SPEC hasn't been made public yet. And UEFI changes
> > of LoongArch are under review now.
> >
> > Cc: linux-efi@xxxxxxxxxxxxxxx
> > Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
> > Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
> > ---
> > arch/loongarch/include/asm/acenv.h | 18 +
> > arch/loongarch/include/asm/acpi.h | 38 ++
> > arch/loongarch/include/asm/bootinfo.h | 41 +++
> > arch/loongarch/include/asm/dmi.h | 24 ++
> > arch/loongarch/include/asm/efi.h | 41 +++
> > arch/loongarch/include/asm/reboot.h | 10 +
> > arch/loongarch/include/asm/setup.h | 21 ++
> > arch/loongarch/kernel/acpi.c | 338 +++++++++++++++++
> > arch/loongarch/kernel/cacheinfo.c | 122 ++++++
> > arch/loongarch/kernel/cpu-probe.c | 292 +++++++++++++++
> > arch/loongarch/kernel/efi-header.S | 100 +++++
> > arch/loongarch/kernel/efi.c | 229 ++++++++++++
> > arch/loongarch/kernel/env.c | 70 ++++
> > arch/loongarch/kernel/head.S | 101 +++++
> > arch/loongarch/kernel/image-vars.h | 29 ++
> > arch/loongarch/kernel/mem.c | 64 ++++
> > arch/loongarch/kernel/reset.c | 90 +++++
> > arch/loongarch/kernel/setup.c | 348 ++++++++++++++++++
> > arch/loongarch/kernel/time.c | 220 +++++++++++
> > arch/loongarch/kernel/topology.c | 13 +
> > drivers/firmware/efi/Kconfig | 2 +-
> > drivers/firmware/efi/libstub/Makefile | 10 +
> > .../firmware/efi/libstub/efi-stub-helper.c | 2 +-
> > drivers/firmware/efi/libstub/efi-stub.c | 2 +-
> > drivers/firmware/efi/libstub/loongarch-stub.c | 87 +++++
> > include/linux/efi.h | 1 +
> > include/linux/pe.h | 1 +
> > 27 files changed, 2311 insertions(+), 3 deletions(-)
> > create mode 100644 arch/loongarch/include/asm/acenv.h
> > create mode 100644 arch/loongarch/include/asm/acpi.h
> > create mode 100644 arch/loongarch/include/asm/bootinfo.h
> > create mode 100644 arch/loongarch/include/asm/dmi.h
> > create mode 100644 arch/loongarch/include/asm/efi.h
> > create mode 100644 arch/loongarch/include/asm/reboot.h
> > create mode 100644 arch/loongarch/include/asm/setup.h
> > create mode 100644 arch/loongarch/kernel/acpi.c
> > create mode 100644 arch/loongarch/kernel/cacheinfo.c
> > create mode 100644 arch/loongarch/kernel/cpu-probe.c
> > create mode 100644 arch/loongarch/kernel/efi-header.S
> > create mode 100644 arch/loongarch/kernel/efi.c
> > create mode 100644 arch/loongarch/kernel/env.c
> > create mode 100644 arch/loongarch/kernel/head.S
> > create mode 100644 arch/loongarch/kernel/image-vars.h
> > create mode 100644 arch/loongarch/kernel/mem.c
> > create mode 100644 arch/loongarch/kernel/reset.c
> > create mode 100644 arch/loongarch/kernel/setup.c
> > create mode 100644 arch/loongarch/kernel/time.c
> > create mode 100644 arch/loongarch/kernel/topology.c
> > create mode 100644 drivers/firmware/efi/libstub/loongarch-stub.c
> >
> > diff --git a/arch/loongarch/include/asm/acenv.h b/arch/loongarch/include/asm/acenv.h
> > new file mode 100644
> > index 000000000000..52f298f7293b
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/acenv.h
> > @@ -0,0 +1,18 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * LoongArch specific ACPICA environments and implementation
> > + *
> > + * Author: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
> > + * Huacai Chen <chenhuacai@xxxxxxxxxxx>
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +
> > +#ifndef _ASM_LOONGARCH_ACENV_H
> > +#define _ASM_LOONGARCH_ACENV_H
> > +
> > +/*
> > + * This header is required by ACPI core, but we have nothing to fill in
> > + * right now. Will be updated later when needed.
> > + */
> > +
> > +#endif /* _ASM_LOONGARCH_ACENV_H */
> > diff --git a/arch/loongarch/include/asm/acpi.h b/arch/loongarch/include/asm/acpi.h
> > new file mode 100644
> > index 000000000000..62044cd5b7bc
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/acpi.h
> > @@ -0,0 +1,38 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Author: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
> > + * Huacai Chen <chenhuacai@xxxxxxxxxxx>
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +
> > +#ifndef _ASM_LOONGARCH_ACPI_H
> > +#define _ASM_LOONGARCH_ACPI_H
> > +
> > +#ifdef CONFIG_ACPI
> > +extern int acpi_strict;
> > +extern int acpi_disabled;
> > +extern int acpi_pci_disabled;
> > +extern int acpi_noirq;
> > +
> > +#define acpi_os_ioremap acpi_os_ioremap
> > +void __init __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size);
> > +
> > +static inline void disable_acpi(void)
> > +{
> > + acpi_disabled = 1;
> > + acpi_pci_disabled = 1;
> > + acpi_noirq = 1;
> > +}
> > +
> > +static inline bool acpi_has_cpu_in_madt(void)
> > +{
> > + return true;
> > +}
> > +
> > +extern struct list_head acpi_wakeup_device_list;
> > +
> > +#endif /* !CONFIG_ACPI */
> > +
> > +#define ACPI_TABLE_UPGRADE_MAX_PHYS ARCH_LOW_ADDRESS_LIMIT
> > +
> > +#endif /* _ASM_LOONGARCH_ACPI_H */
> > diff --git a/arch/loongarch/include/asm/bootinfo.h b/arch/loongarch/include/asm/bootinfo.h
> > new file mode 100644
> > index 000000000000..0076a9e1a817
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/bootinfo.h
> > @@ -0,0 +1,41 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#ifndef _ASM_BOOTINFO_H
> > +#define _ASM_BOOTINFO_H
> > +
> > +#include <linux/types.h>
> > +#include <asm/setup.h>
> > +
> > +const char *get_system_type(void);
> > +
> > +extern void init_environ(void);
> > +extern void memblock_init(void);
> > +extern void platform_init(void);
> > +
> > +struct loongson_board_info {
> > + int bios_size;
> > + char *bios_vendor;
> > + char *bios_version;
> > + char *bios_release_date;
> > + char *board_name;
> > + char *board_vendor;
> > +};
> > +
> > +struct loongson_system_configuration {
> > + int nr_cpus;
> > + int nr_nodes;
> > + int nr_io_pics;
> > + int boot_cpu_id;
> > + int cores_per_node;
> > + int cores_per_package;
> > + char *cpuname;
> > +};
> > +
> > +extern u64 efi_system_table;
> > +extern struct loongson_board_info b_info;
> > +extern struct loongson_system_configuration loongson_sysconf;
> > +extern unsigned long fw_arg0, fw_arg1, fw_arg2;
> fw_arg2 isn't being used in this revision, so we can just remove it.
OK, will be removed.

> > +
> > +#endif /* _ASM_BOOTINFO_H */
> > diff --git a/arch/loongarch/include/asm/dmi.h b/arch/loongarch/include/asm/dmi.h
> > new file mode 100644
> > index 000000000000..605493417753
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/dmi.h
> > @@ -0,0 +1,24 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#ifndef _ASM_DMI_H
> > +#define _ASM_DMI_H
> > +
> > +#include <linux/io.h>
> > +#include <linux/memblock.h>
> > +
> > +#define dmi_early_remap(x, l) dmi_remap(x, l)
> > +#define dmi_early_unmap(x, l) dmi_unmap(x)
> > +#define dmi_alloc(l) memblock_alloc(l, PAGE_SIZE)
> > +
> > +static inline void *dmi_remap(u64 phys_addr, unsigned long size)
> > +{
> > + return ((void *)TO_CACHE(phys_addr));
> > +}
> > +
> > +static inline void dmi_unmap(void *addr)
> > +{
> > +}
> > +
> > +#endif /* _ASM_DMI_H */
> > diff --git a/arch/loongarch/include/asm/efi.h b/arch/loongarch/include/asm/efi.h
> > new file mode 100644
> > index 000000000000..0127d84d5e1d
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/efi.h
> > @@ -0,0 +1,41 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#ifndef _ASM_LOONGARCH_EFI_H
> > +#define _ASM_LOONGARCH_EFI_H
> > +
> > +#include <linux/efi.h>
> > +
> > +void __init efi_init(void);
> > +void __init efi_runtime_init(void);
> > +void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
> > +
> > +#define ARCH_EFI_IRQ_FLAGS_MASK 0x00000004 /* Bit 2: CSR.CRMD.IE */
> > +
> > +#define arch_efi_call_virt_setup() \
> > +({ \
> > +})
> > +
> > +#define arch_efi_call_virt(p, f, args...) \
> > +({ \
> > + efi_##f##_t * __f; \
> > + __f = p->f; \
> > + __f(args); \
> > +})
> > +
> > +#define arch_efi_call_virt_teardown() \
> > +({ \
> > +})
> > +
> > +#define EFI_ALLOC_ALIGN SZ_64K
> > +
> > +struct screen_info *alloc_screen_info(void);
> > +void free_screen_info(struct screen_info *si);
> > +
> > +static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr)
> > +{
> > + return ULONG_MAX;
> > +}
> > +
> > +#endif /* _ASM_LOONGARCH_EFI_H */
> > diff --git a/arch/loongarch/include/asm/reboot.h b/arch/loongarch/include/asm/reboot.h
> > new file mode 100644
> > index 000000000000..51151749d8f0
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/reboot.h
> > @@ -0,0 +1,10 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#ifndef _ASM_REBOOT_H
> > +#define _ASM_REBOOT_H
> > +
> > +extern void (*pm_restart)(void);
> > +
> > +#endif /* _ASM_REBOOT_H */
> > diff --git a/arch/loongarch/include/asm/setup.h b/arch/loongarch/include/asm/setup.h
> > new file mode 100644
> > index 000000000000..6d7d2a3e23dd
> > --- /dev/null
> > +++ b/arch/loongarch/include/asm/setup.h
> > @@ -0,0 +1,21 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +
> > +#ifndef _LOONGARCH_SETUP_H
> > +#define _LOONGARCH_SETUP_H
> > +
> > +#include <linux/types.h>
> > +#include <uapi/asm/setup.h>
> > +
> > +#define VECSIZE 0x200
> > +
> > +extern unsigned long eentry;
> > +extern unsigned long tlbrentry;
> > +extern void cpu_cache_init(void);
> > +extern void per_cpu_trap_init(int cpu);
> > +extern void set_handler(unsigned long offset, void *addr, unsigned long len);
> > +extern void set_merr_handler(unsigned long offset, void *addr, unsigned long len);
> > +
> > +#endif /* __SETUP_H */
> > diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.c
> > new file mode 100644
> > index 000000000000..506ab9912c51
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/acpi.c
> > @@ -0,0 +1,338 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * acpi.c - Architecture-Specific Low-Level ACPI Boot Support
> > + *
> > + * Author: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
> > + * Huacai Chen <chenhuacai@xxxxxxxxxxx>
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +
> > +#include <linux/init.h>
> > +#include <linux/acpi.h>
> > +#include <linux/irq.h>
> > +#include <linux/irqdomain.h>
> > +#include <linux/memblock.h>
> > +#include <linux/serial_core.h>
> > +#include <asm/io.h>
> > +#include <asm/loongson.h>
> > +
> > +int acpi_disabled;
> > +EXPORT_SYMBOL(acpi_disabled);
> > +int acpi_noirq;
> > +int acpi_pci_disabled;
> > +EXPORT_SYMBOL(acpi_pci_disabled);
> > +int acpi_strict = 1; /* We have no workarounds on LoongArch */
> > +int num_processors;
> > +int disabled_cpus;
> > +enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
> > +
> > +u64 acpi_saved_sp;
> > +
> > +#define MAX_CORE_PIC 256
> > +
> > +#define PREFIX "ACPI: "
> > +
> > +int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
> > +{
> > + if (irqp != NULL)
> > + *irqp = acpi_register_gsi(NULL, gsi, -1, -1);
> > + return (*irqp >= 0) ? 0 : -EINVAL;
> > +}
> > +EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
> > +
> > +int acpi_isa_irq_to_gsi(unsigned int isa_irq, u32 *gsi)
> > +{
> > + if (gsi)
> > + *gsi = isa_irq;
> > + return 0;
> > +}
> > +
> > +/*
> > + * success: return IRQ number (>=0)
> > + * failure: return < 0
> > + */
> > +int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
> > +{
> > + int id;
> > + struct irq_fwspec fwspec;
> > +
> > + switch (gsi) {
> > + case GSI_MIN_CPU_IRQ ... GSI_MAX_CPU_IRQ:
> > + fwspec.fwnode = liointc_domain->fwnode;
> > + fwspec.param[0] = gsi - GSI_MIN_CPU_IRQ;
> > + fwspec.param_count = 1;
> > +
> > + return irq_create_fwspec_mapping(&fwspec);
> > +
> > + case GSI_MIN_LPC_IRQ ... GSI_MAX_LPC_IRQ:
> > + if (!pch_lpc_domain)
> > + return -EINVAL;
> > +
> > + fwspec.fwnode = pch_lpc_domain->fwnode;
> > + fwspec.param[0] = gsi - GSI_MIN_LPC_IRQ;
> > + fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity);
> > + fwspec.param_count = 2;
> > +
> > + return irq_create_fwspec_mapping(&fwspec);
> > +
> > + case GSI_MIN_PCH_IRQ ... GSI_MAX_PCH_IRQ:
> > + id = find_pch_pic(gsi);
> > + if (id < 0)
> > + return -EINVAL;
> > +
> > + fwspec.fwnode = pch_pic_domain[id]->fwnode;
> > + fwspec.param[0] = gsi - acpi_pchpic[id]->gsi_base;
> > + fwspec.param[1] = IRQ_TYPE_LEVEL_HIGH;
> > + fwspec.param_count = 2;
> > +
> > + return irq_create_fwspec_mapping(&fwspec);
> > + }
> > +
> > + return -EINVAL;
> > +}
> > +EXPORT_SYMBOL_GPL(acpi_register_gsi);
> > +
> > +void acpi_unregister_gsi(u32 gsi)
> > +{
> > +
> > +}
> > +EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
> > +
> > +void __init __iomem * __acpi_map_table(unsigned long phys, unsigned long size)
> > +{
> > +
> > + if (!phys || !size)
> > + return NULL;
> > +
> > + return early_memremap(phys, size);
> > +}
> > +void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
> > +{
> > + if (!map || !size)
> > + return;
> > +
> > + early_memunmap(map, size);
> > +}
> > +
> > +void __init __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
> > +{
> > + if (!memblock_is_memory(phys))
> > + return ioremap(phys, size);
> > + else
> > + return ioremap_cache(phys, size);
> > +}
> > +
> > +void __init acpi_boot_table_init(void)
> > +{
> > + /*
> > + * If acpi_disabled, bail out
> > + */
> > + if (acpi_disabled)
> > + return;
> > +
> > + /*
> > + * Initialize the ACPI boot-time table parser.
> > + */
> > + if (acpi_table_init()) {
> > + disable_acpi();
> > + return;
> > + }
> > +}
> > +
> > +static int __init
> > +acpi_parse_cpuintc(union acpi_subtable_headers *header, const unsigned long end)
> > +{
> > + struct acpi_madt_core_pic *processor = NULL;
> > +
> > + processor = (struct acpi_madt_core_pic *)header;
> > + if (BAD_MADT_ENTRY(processor, end))
> > + return -EINVAL;
> > +
> > + acpi_table_print_madt_entry(&header->common);
> > +
> > + return 0;
> > +}
> > +
> > +static int __init
> > +acpi_parse_liointc(union acpi_subtable_headers *header, const unsigned long end)
> > +{
> > + struct acpi_madt_lio_pic *liointc = NULL;
> > +
> > + liointc = (struct acpi_madt_lio_pic *)header;
> > +
> > + if (BAD_MADT_ENTRY(liointc, end))
> > + return -EINVAL;
> > +
> > + acpi_liointc = liointc;
> > +
> > + return 0;
> > +}
> > +
> > +static int __init
> > +acpi_parse_eiointc(union acpi_subtable_headers *header, const unsigned long end)
> > +{
> > + static int id = 0;
> > + struct acpi_madt_eio_pic *eiointc = NULL;
> > +
> > + eiointc = (struct acpi_madt_eio_pic *)header;
> > +
> > + if (BAD_MADT_ENTRY(eiointc, end))
> > + return -EINVAL;
> > +
> > + acpi_eiointc[id++] = eiointc;
> > + loongson_sysconf.nr_io_pics = id;
> > +
> > + return 0;
> > +}
> > +
> > +static int __init
> > +acpi_parse_htintc(union acpi_subtable_headers *header, const unsigned long end)
> > +{
> > + struct acpi_madt_ht_pic *htintc = NULL;
> > +
> > + htintc = (struct acpi_madt_ht_pic *)header;
> > +
> > + if (BAD_MADT_ENTRY(htintc, end))
> > + return -EINVAL;
> > +
> > + acpi_htintc = htintc;
> > + loongson_sysconf.nr_io_pics = 1;
> > +
> > + return 0;
> > +}
> > +
> > +static int __init
> > +acpi_parse_pch_pic(union acpi_subtable_headers *header, const unsigned long end)
> > +{
> > + static int id = 0;
> > + struct acpi_madt_bio_pic *pchpic = NULL;
> > +
> > + pchpic = (struct acpi_madt_bio_pic *)header;
> > +
> > + if (BAD_MADT_ENTRY(pchpic, end))
> > + return -EINVAL;
> > +
> > + acpi_pchpic[id++] = pchpic;
> > +
> > + return 0;
> > +}
> > +
> > +static int __init
> > +acpi_parse_pch_msi(union acpi_subtable_headers *header, const unsigned long end)
> > +{
> > + static int id = 0;
> > + struct acpi_madt_msi_pic *pchmsi = NULL;
> > +
> > + pchmsi = (struct acpi_madt_msi_pic *)header;
> > +
> > + if (BAD_MADT_ENTRY(pchmsi, end))
> > + return -EINVAL;
> > +
> > + acpi_pchmsi[id++] = pchmsi;
> > +
> > + return 0;
> > +}
> > +
> > +static int __init
> > +acpi_parse_pch_lpc(union acpi_subtable_headers *header, const unsigned long end)
> > +{
> > + struct acpi_madt_lpc_pic *pchlpc = NULL;
> > +
> > + pchlpc = (struct acpi_madt_lpc_pic *)header;
> > +
> > + if (BAD_MADT_ENTRY(pchlpc, end))
> > + return -EINVAL;
> > +
> > + acpi_pchlpc = pchlpc;
> > +
> > + return 0;
> > +}
> > +
> > +static void __init acpi_process_madt(void)
> > +{
> > + int error;
> > +
> > + /* Parse MADT CPUINTC entries */
> > + error = acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC, acpi_parse_cpuintc, MAX_CORE_PIC);
> > + if (error < 0) {
> > + disable_acpi();
> > + pr_err(PREFIX "Invalid BIOS MADT (CPUINTC entries), ACPI disabled\n");
> > + return;
> > + }
> > +
> > + loongson_sysconf.nr_cpus = num_processors;
> > +
> > + /* Parse MADT LIOINTC entries */
> > + error = acpi_table_parse_madt(ACPI_MADT_TYPE_LIO_PIC, acpi_parse_liointc, 1);
> > + if (error < 0) {
> > + disable_acpi();
> > + pr_err(PREFIX "Invalid BIOS MADT (LIOINTC entries), ACPI disabled\n");
> > + return;
> > + }
> > +
> > + /* Parse MADT EIOINTC entries */
> > + error = acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC, acpi_parse_eiointc, MAX_IO_PICS);
> > + if (error < 0) {
> > + disable_acpi();
> > + pr_err(PREFIX "Invalid BIOS MADT (EIOINTC entries), ACPI disabled\n");
> > + return;
> > + }
> > +
> > + /* Parse MADT HTVEC entries */
> > + error = acpi_table_parse_madt(ACPI_MADT_TYPE_HT_PIC, acpi_parse_htintc, 1);
> > + if (error < 0) {
> > + disable_acpi();
> > + pr_err(PREFIX "Invalid BIOS MADT (HTVEC entries), ACPI disabled\n");
> > + return;
> > + }
> > +
> > + /* Parse MADT PCHPIC entries */
> > + error = acpi_table_parse_madt(ACPI_MADT_TYPE_BIO_PIC, acpi_parse_pch_pic, MAX_IO_PICS);
> > + if (error < 0) {
> > + disable_acpi();
> > + pr_err(PREFIX "Invalid BIOS MADT (PCHPIC entries), ACPI disabled\n");
> > + return;
> > + }
> > +
> > + /* Parse MADT PCHMSI entries */
> > + error = acpi_table_parse_madt(ACPI_MADT_TYPE_MSI_PIC, acpi_parse_pch_msi, MAX_IO_PICS);
> > + if (error < 0) {
> > + disable_acpi();
> > + pr_err(PREFIX "Invalid BIOS MADT (PCHMSI entries), ACPI disabled\n");
> > + return;
> > + }
> > +
> > + /* Parse MADT PCHLPC entries */
> > + error = acpi_table_parse_madt(ACPI_MADT_TYPE_LPC_PIC, acpi_parse_pch_lpc, 1);
> > + if (error < 0) {
> > + disable_acpi();
> > + pr_err(PREFIX "Invalid BIOS MADT (PCHLPC entries), ACPI disabled\n");
> > + return;
> > + }
> > +}
> > +
> > +int __init acpi_boot_init(void)
> > +{
> > + /*
> > + * If acpi_disabled, bail out
> > + */
> > + if (acpi_disabled)
> > + return -1;
> > +
> > + loongson_sysconf.boot_cpu_id = read_csr_cpuid();
> > +
> > + /*
> > + * Process the Multiple APIC Description Table (MADT), if present
> > + */
> > + acpi_process_madt();
> > +
> > + /* Do not enable ACPI SPCR console by default */
> > + acpi_parse_spcr(earlycon_acpi_spcr_enable, false);
> > +
> > + return 0;
> > +}
> > +
> > +void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
> > +{
> > + memblock_reserve(addr, size);
> > +}
> > diff --git a/arch/loongarch/kernel/cacheinfo.c b/arch/loongarch/kernel/cacheinfo.c
> > new file mode 100644
> > index 000000000000..8c9fe29e98f0
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/cacheinfo.c
> > @@ -0,0 +1,122 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * LoongArch cacheinfo support
> > + *
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/cacheinfo.h>
> > +
> > +/* Populates leaf and increments to next leaf */
> > +#define populate_cache(cache, leaf, c_level, c_type) \
> > +do { \
> > + leaf->type = c_type; \
> > + leaf->level = c_level; \
> > + leaf->coherency_line_size = c->cache.linesz; \
> > + leaf->number_of_sets = c->cache.sets; \
> > + leaf->ways_of_associativity = c->cache.ways; \
> > + leaf->size = c->cache.linesz * c->cache.sets * \
> > + c->cache.ways; \
> > + leaf++; \
> > +} while (0)
> > +
> > +int init_cache_level(unsigned int cpu)
> > +{
> > + struct cpuinfo_loongarch *c = &current_cpu_data;
> > + struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
> > + int levels = 0, leaves = 0;
> > +
> > + /*
> > + * If Dcache is not set, we assume the cache structures
> > + * are not properly initialized.
> > + */
> > + if (c->dcache.waysize)
> > + levels += 1;
> > + else
> > + return -ENOENT;
> > +
> > +
> > + leaves += (c->icache.waysize) ? 2 : 1;
> > +
> > + if (c->vcache.waysize) {
> > + levels++;
> > + leaves++;
> > + }
> > +
> > + if (c->scache.waysize) {
> > + levels++;
> > + leaves++;
> > + }
> > +
> > + if (c->tcache.waysize) {
> > + levels++;
> > + leaves++;
> > + }
> > +
> > + this_cpu_ci->num_levels = levels;
> > + this_cpu_ci->num_leaves = leaves;
> > + return 0;
> > +}
> > +
> > +static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
> > + struct cacheinfo *sib_leaf)
> > +{
> > + return !((this_leaf->level == 1) || (this_leaf->level == 2));
> > +}
> > +
> > +static void cache_cpumap_setup(unsigned int cpu)
> > +{
> > + struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
> > + struct cacheinfo *this_leaf, *sib_leaf;
> > + unsigned int index;
> > +
> > + for (index = 0; index < this_cpu_ci->num_leaves; index++) {
> > + unsigned int i;
> > +
> > + this_leaf = this_cpu_ci->info_list + index;
> > + /* skip if shared_cpu_map is already populated */
> > + if (!cpumask_empty(&this_leaf->shared_cpu_map))
> > + continue;
> > +
> > + cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
> > + for_each_online_cpu(i) {
> > + struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i);
> > +
> > + if (i == cpu || !sib_cpu_ci->info_list)
> > + continue;/* skip if itself or no cacheinfo */
> > + sib_leaf = sib_cpu_ci->info_list + index;
> > + if (cache_leaves_are_shared(this_leaf, sib_leaf)) {
> > + cpumask_set_cpu(cpu, &sib_leaf->shared_cpu_map);
> > + cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
> > + }
> > + }
> > + }
> > +}
> > +
> > +int populate_cache_leaves(unsigned int cpu)
> > +{
> > + int level = 1;
> > + struct cpuinfo_loongarch *c = &current_cpu_data;
> > + struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
> > + struct cacheinfo *this_leaf = this_cpu_ci->info_list;
> > +
> > + if (c->icache.waysize) {
> > + populate_cache(dcache, this_leaf, level, CACHE_TYPE_DATA);
> > + populate_cache(icache, this_leaf, level++, CACHE_TYPE_INST);
> > + } else {
> > + populate_cache(dcache, this_leaf, level++, CACHE_TYPE_UNIFIED);
> > + }
> > +
> > + if (c->vcache.waysize)
> > + populate_cache(vcache, this_leaf, level++, CACHE_TYPE_UNIFIED);
> > +
> > + if (c->scache.waysize)
> > + populate_cache(scache, this_leaf, level++, CACHE_TYPE_UNIFIED);
> > +
> > + if (c->tcache.waysize)
> > + populate_cache(tcache, this_leaf, level++, CACHE_TYPE_UNIFIED);
> > +
> > + cache_cpumap_setup(cpu);
> > + this_cpu_ci->cpu_map_populated = true;
> > +
> > + return 0;
> > +}
> > diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-probe.c
> > new file mode 100644
> > index 000000000000..5a33c03ccc2d
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/cpu-probe.c
> > @@ -0,0 +1,292 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Processor capabilities determination functions.
> > + *
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/init.h>
> > +#include <linux/kernel.h>
> > +#include <linux/ptrace.h>
> > +#include <linux/smp.h>
> > +#include <linux/stddef.h>
> > +#include <linux/export.h>
> > +#include <linux/printk.h>
> > +#include <linux/uaccess.h>
> > +
> > +#include <asm/cpu-features.h>
> > +#include <asm/elf.h>
> > +#include <asm/fpu.h>
> > +#include <asm/loongarch.h>
> > +#include <asm/pgtable-bits.h>
> > +#include <asm/setup.h>
> > +
> > +/* Hardware capabilities */
> > +unsigned int elf_hwcap __read_mostly;
> > +EXPORT_SYMBOL_GPL(elf_hwcap);
> > +
> > +/*
> > + * Determine the FCSR mask for FPU hardware.
> > + */
> > +static inline void cpu_set_fpu_fcsr_mask(struct cpuinfo_loongarch *c)
> > +{
> > + unsigned long sr, mask, fcsr, fcsr0, fcsr1;
> > +
> > + fcsr = c->fpu_csr0;
> > + mask = FPU_CSR_ALL_X | FPU_CSR_ALL_E | FPU_CSR_ALL_S | FPU_CSR_RM;
> > +
> > + sr = read_csr_euen();
> > + enable_fpu();
> > +
> > + fcsr0 = fcsr & mask;
> > + write_fcsr(LOONGARCH_FCSR0, fcsr0);
> > + fcsr0 = read_fcsr(LOONGARCH_FCSR0);
> > +
> > + fcsr1 = fcsr | ~mask;
> > + write_fcsr(LOONGARCH_FCSR0, fcsr1);
> > + fcsr1 = read_fcsr(LOONGARCH_FCSR0);
> > +
> > + write_fcsr(LOONGARCH_FCSR0, fcsr);
> > +
> > + write_csr_euen(sr);
> > +
> > + c->fpu_mask = ~(fcsr0 ^ fcsr1) & ~mask;
> > +}
> > +
> > +static inline void set_elf_platform(int cpu, const char *plat)
> > +{
> > + if (cpu == 0)
> > + __elf_platform = plat;
> > +}
> > +
> > +/* MAP BASE */
> > +unsigned long vm_map_base;
> > +EXPORT_SYMBOL_GPL(vm_map_base);
> > +
> > +static void cpu_probe_addrbits(struct cpuinfo_loongarch *c)
> > +{
> > +#ifdef __NEED_ADDRBITS_PROBE
> > + c->pabits = (read_cpucfg(LOONGARCH_CPUCFG1) & CPUCFG1_PABITS) >> 4;
> > + c->vabits = (read_cpucfg(LOONGARCH_CPUCFG1) & CPUCFG1_VABITS) >> 12;
> > + vm_map_base = 0UL - (1UL << c->vabits);
> > +#endif
> > +}
> > +
> > +static void set_isa(struct cpuinfo_loongarch *c, unsigned int isa)
> > +{
> > + switch (isa) {
> > + case LOONGARCH_CPU_ISA_LA64:
> > + c->isa_level |= LOONGARCH_CPU_ISA_LA64;
> > + fallthrough;
> > + case LOONGARCH_CPU_ISA_LA32S:
> > + c->isa_level |= LOONGARCH_CPU_ISA_LA32S;
> > + fallthrough;
> > + case LOONGARCH_CPU_ISA_LA32R:
> > + c->isa_level |= LOONGARCH_CPU_ISA_LA32R;
> > + break;
> > + }
> > +}
> > +
> > +static void cpu_probe_common(struct cpuinfo_loongarch *c)
> > +{
> > + unsigned int config;
> > + unsigned long asid_mask;
> > +
> > + c->options = LOONGARCH_CPU_CPUCFG | LOONGARCH_CPU_CSR |
> > + LOONGARCH_CPU_TLB | LOONGARCH_CPU_VINT | LOONGARCH_CPU_WATCH;
> > +
> > + elf_hwcap |= HWCAP_LOONGARCH_CRC32;
> > +
> > + config = read_cpucfg(LOONGARCH_CPUCFG1);
> > + if (config & CPUCFG1_UAL) {
> > + c->options |= LOONGARCH_CPU_UAL;
> > + elf_hwcap |= HWCAP_LOONGARCH_UAL;
> > + }
> > +
> > + config = read_cpucfg(LOONGARCH_CPUCFG2);
> > + if (config & CPUCFG2_LAM) {
> > + c->options |= LOONGARCH_CPU_LAM;
> > + elf_hwcap |= HWCAP_LOONGARCH_LAM;
> > + }
> > + if (config & CPUCFG2_FP) {
> > + c->options |= LOONGARCH_CPU_FPU;
> > + elf_hwcap |= HWCAP_LOONGARCH_FPU;
> > + }
> > + if (config & CPUCFG2_COMPLEX) {
> > + c->options |= LOONGARCH_CPU_COMPLEX;
> > + elf_hwcap |= HWCAP_LOONGARCH_COMPLEX;
> > + }
> > + if (config & CPUCFG2_CRYPTO) {
> > + c->options |= LOONGARCH_CPU_CRYPTO;
> > + elf_hwcap |= HWCAP_LOONGARCH_CRYPTO;
> > + }
> > + if (config & CPUCFG2_LVZP) {
> > + c->options |= LOONGARCH_CPU_LVZ;
> > + elf_hwcap |= HWCAP_LOONGARCH_LVZ;
> > + }
> > +
> > + config = read_cpucfg(LOONGARCH_CPUCFG6);
> > + if (config & CPUCFG6_PMP)
> > + c->options |= LOONGARCH_CPU_PMP;
> > +
> > + config = iocsr_readl(LOONGARCH_IOCSR_FEATURES);
> > + if (config & IOCSRF_CSRIPI)
> > + c->options |= LOONGARCH_CPU_CSRIPI;
> > + if (config & IOCSRF_EXTIOI)
> > + c->options |= LOONGARCH_CPU_EXTIOI;
> > + if (config & IOCSRF_FREQSCALE)
> > + c->options |= LOONGARCH_CPU_SCALEFREQ;
> > + if (config & IOCSRF_FLATMODE)
> > + c->options |= LOONGARCH_CPU_FLATMODE;
> > + if (config & IOCSRF_EIODECODE)
> > + c->options |= LOONGARCH_CPU_EIODECODE;
> > + if (config & IOCSRF_VM)
> > + c->options |= LOONGARCH_CPU_HYPERVISOR;
> > +
> > + config = csr_readl(LOONGARCH_CSR_ASID);
> > + config = (config & CSR_ASID_BIT) >> CSR_ASID_BIT_SHIFT;
> > + asid_mask = GENMASK(config - 1, 0);
> > + set_cpu_asid_mask(c, asid_mask);
> > +
> > + config = read_csr_prcfg1();
> > + c->ksave_mask = GENMASK((config & CSR_CONF1_KSNUM) - 1, 0);
> > + c->ksave_mask &= ~(EXC_KSAVE_MASK | PERCPU_KSAVE_MASK | KVM_KSAVE_MASK);
> > +
> > + config = read_csr_prcfg3();
> > + switch (config & CSR_CONF3_TLBTYPE) {
> > + case 0:
> > + c->tlbsizemtlb = 0;
> > + c->tlbsizestlbsets = 0;
> > + c->tlbsizestlbways = 0;
> > + c->tlbsize = 0;
> > + break;
> > + case 1:
> > + c->tlbsizemtlb = ((config & CSR_CONF3_MTLBSIZE) >> CSR_CONF3_MTLBSIZE_SHIFT) + 1;
> > + c->tlbsizestlbsets = 0;
> > + c->tlbsizestlbways = 0;
> > + c->tlbsize = c->tlbsizemtlb + c->tlbsizestlbsets * c->tlbsizestlbways;
> > + break;
> > + case 2:
> > + c->tlbsizemtlb = ((config & CSR_CONF3_MTLBSIZE) >> CSR_CONF3_MTLBSIZE_SHIFT) + 1;
> > + c->tlbsizestlbsets = 1 << ((config & CSR_CONF3_STLBIDX) >> CSR_CONF3_STLBIDX_SHIFT);
> > + c->tlbsizestlbways = ((config & CSR_CONF3_STLBWAYS) >> CSR_CONF3_STLBWAYS_SHIFT) + 1;
> > + c->tlbsize = c->tlbsizemtlb + c->tlbsizestlbsets * c->tlbsizestlbways;
> > + break;
> > + default:
> > + pr_warn("Warning: unknown TLB type\n");
> > + }
> > +}
> > +
> > +#define MAX_NAME_LEN 32
> > +#define VENDOR_OFFSET 0
> > +#define CPUNAME_OFFSET 9
> > +
> > +static char cpu_full_name[MAX_NAME_LEN] = " - ";
> > +
> > +static inline void cpu_probe_loongson(struct cpuinfo_loongarch *c, unsigned int cpu)
> > +{
> > + uint64_t *vendor = (void *)(&cpu_full_name[VENDOR_OFFSET]);
> > + uint64_t *cpuname = (void *)(&cpu_full_name[CPUNAME_OFFSET]);
> > +
> > + __cpu_full_name[cpu] = cpu_full_name;
> > + *vendor = iocsr_readq(LOONGARCH_IOCSR_VENDOR);
> > + *cpuname = iocsr_readq(LOONGARCH_IOCSR_CPUNAME);
> > +
> > + switch (c->processor_id & PRID_SERIES_MASK) {
> > + case PRID_SERIES_LA132:
> > + c->cputype = CPU_LOONGSON32;
> > + set_isa(c, LOONGARCH_CPU_ISA_LA32S);
> > + __cpu_family[cpu] = "Loongson-32bit";
> > + pr_info("32-bit Loongson Processor probed (LA132 Core)\n");
> > + break;
> > + case PRID_SERIES_LA264:
> > + c->cputype = CPU_LOONGSON64;
> > + set_isa(c, LOONGARCH_CPU_ISA_LA64);
> > + __cpu_family[cpu] = "Loongson-64bit";
> > + pr_info("64-bit Loongson Processor probed (LA264 Core)\n");
> > + break;
> > + case PRID_SERIES_LA364:
> > + c->cputype = CPU_LOONGSON64;
> > + set_isa(c, LOONGARCH_CPU_ISA_LA64);
> > + __cpu_family[cpu] = "Loongson-64bit";
> > + pr_info("64-bit Loongson Processor probed (LA364 Core)\n");
> > + break;
> > + case PRID_SERIES_LA464:
> > + c->cputype = CPU_LOONGSON64;
> > + set_isa(c, LOONGARCH_CPU_ISA_LA64);
> > + __cpu_family[cpu] = "Loongson-64bit";
> > + pr_info("64-bit Loongson Processor probed (LA464 Core)\n");
> > + break;
> > + case PRID_SERIES_LA664:
> > + c->cputype = CPU_LOONGSON64;
> > + set_isa(c, LOONGARCH_CPU_ISA_LA64);
> > + __cpu_family[cpu] = "Loongson-64bit";
> > + pr_info("64-bit Loongson Processor probed (LA664 Core)\n");
> > + break;
> > + default: /* Default to 64 bit */
> > + c->cputype = CPU_LOONGSON64;
> > + set_isa(c, LOONGARCH_CPU_ISA_LA64);
> > + __cpu_family[cpu] = "Loongson-64bit";
> > + pr_info("64-bit Loongson Processor probed (Unknown Core)\n");
> > + }
> > +}
> > +
> > +#ifdef CONFIG_64BIT
> > +/* For use by uaccess.h */
> > +u64 __ua_limit;
> > +EXPORT_SYMBOL(__ua_limit);
> > +#endif
> > +
> > +const char *__cpu_family[NR_CPUS];
> > +const char *__cpu_full_name[NR_CPUS];
> > +const char *__elf_platform;
> > +
> > +static void cpu_report(void)
> > +{
> > + struct cpuinfo_loongarch *c = &current_cpu_data;
> > +
> > + pr_info("CPU%d revision is: %08x (%s)\n",
> > + smp_processor_id(), c->processor_id, cpu_family_string());
> > + if (c->options & LOONGARCH_CPU_FPU)
> > + pr_info("FPU%d revision is: %08x\n", smp_processor_id(), c->fpu_vers);
> > +}
> > +
> > +void cpu_probe(void)
> > +{
> > + unsigned int cpu = smp_processor_id();
> > + struct cpuinfo_loongarch *c = &current_cpu_data;
> > +
> > + /*
> > + * Set a default ELF platform, cpu probe may later
> > + * overwrite it with a more precise value
> > + */
> > + set_elf_platform(cpu, "loongarch");
> > +
> > + c->cputype = CPU_UNKNOWN;
> > + c->processor_id = read_cpucfg(LOONGARCH_CPUCFG0);
> > + c->fpu_vers = (read_cpucfg(LOONGARCH_CPUCFG2) >> 3) & 0x3;
> > +
> > + c->fpu_csr0 = FPU_CSR_RN;
> > + c->fpu_mask = FPU_CSR_RSVD;
> > +
> > + cpu_probe_common(c);
> > +
> > + per_cpu_trap_init(cpu);
> > +
> > + switch (c->processor_id & PRID_COMP_MASK) {
> > + case PRID_COMP_LOONGSON:
> > + cpu_probe_loongson(c, cpu);
> > + break;
> > + }
> > +
> > + BUG_ON(!__cpu_family[cpu]);
> > + BUG_ON(c->cputype == CPU_UNKNOWN);
> > +
> > + cpu_probe_addrbits(c);
> > +
> > +#ifdef CONFIG_64BIT
> > + if (cpu == 0)
> > + __ua_limit = ~((1ull << cpu_vabits) - 1);
> > +#endif
> > +
> > + cpu_report();
> > +}
> > diff --git a/arch/loongarch/kernel/efi-header.S b/arch/loongarch/kernel/efi-header.S
> > new file mode 100644
> > index 000000000000..d299cac4e691
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/efi-header.S
> > @@ -0,0 +1,100 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +
> > +#include <linux/pe.h>
> > +#include <linux/sizes.h>
> > +
> > + .macro __EFI_PE_HEADER
> > + .long PE_MAGIC
> > +.Lcoff_header:
> > + .short IMAGE_FILE_MACHINE_LOONGARCH /* Machine */
> > + .short .Lsection_count /* NumberOfSections */
> > + .long 0 /* TimeDateStamp */
> > + .long 0 /* PointerToSymbolTable */
> > + .long 0 /* NumberOfSymbols */
> > + .short .Lsection_table - .Loptional_header /* SizeOfOptionalHeader */
> > + .short IMAGE_FILE_DEBUG_STRIPPED | \
> > + IMAGE_FILE_EXECUTABLE_IMAGE | \
> > + IMAGE_FILE_LINE_NUMS_STRIPPED /* Characteristics */
> > +
> > +.Loptional_header:
> > + .short PE_OPT_MAGIC_PE32PLUS /* PE32+ format */
> > + .byte 0x02 /* MajorLinkerVersion */
> > + .byte 0x14 /* MinorLinkerVersion */
> > + .long __inittext_end - .Lefi_header_end /* SizeOfCode */
> > + .long _end - __initdata_begin /* SizeOfInitializedData */
> > + .long 0 /* SizeOfUninitializedData */
> > + .long __efistub_efi_pe_entry - _head /* AddressOfEntryPoint */
> > + .long .Lefi_header_end - _head /* BaseOfCode */
> > +
> > +.Lextra_header_fields:
> > + .quad 0 /* ImageBase */
> > + .long PECOFF_SEGMENT_ALIGN /* SectionAlignment */
> > + .long PECOFF_FILE_ALIGN /* FileAlignment */
> > + .short 0 /* MajorOperatingSystemVersion */
> > + .short 0 /* MinorOperatingSystemVersion */
> > + .short LINUX_EFISTUB_MAJOR_VERSION /* MajorImageVersion */
> > + .short LINUX_EFISTUB_MINOR_VERSION /* MinorImageVersion */
> > + .short 0 /* MajorSubsystemVersion */
> > + .short 0 /* MinorSubsystemVersion */
> > + .long 0 /* Win32VersionValue */
> > +
> > + .long _end - _head /* SizeOfImage */
> > +
> > + /* Everything before the kernel image is considered part of the header */
> > + .long .Lefi_header_end - _head /* SizeOfHeaders */
> > + .long 0 /* CheckSum */
> > + .short IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */
> > + .short 0 /* DllCharacteristics */
> > + .quad 0 /* SizeOfStackReserve */
> > + .quad 0 /* SizeOfStackCommit */
> > + .quad 0 /* SizeOfHeapReserve */
> > + .quad 0 /* SizeOfHeapCommit */
> > + .long 0 /* LoaderFlags */
> > + .long (.Lsection_table - .) / 8 /* NumberOfRvaAndSizes */
> > +
> > + .quad 0 /* ExportTable */
> > + .quad 0 /* ImportTable */
> > + .quad 0 /* ResourceTable */
> > + .quad 0 /* ExceptionTable */
> > + .quad 0 /* CertificationTable */
> > + .quad 0 /* BaseRelocationTable */
> > +
> > + /* Section table */
> > +.Lsection_table:
> > + .ascii ".text\0\0\0"
> > + .long __inittext_end - .Lefi_header_end /* VirtualSize */
> > + .long .Lefi_header_end - _head /* VirtualAddress */
> > + .long __inittext_end - .Lefi_header_end /* SizeOfRawData */
> > + .long .Lefi_header_end - _head /* PointerToRawData */
> > +
> > + .long 0 /* PointerToRelocations */
> > + .long 0 /* PointerToLineNumbers */
> > + .short 0 /* NumberOfRelocations */
> > + .short 0 /* NumberOfLineNumbers */
> > + .long IMAGE_SCN_CNT_CODE | \
> > + IMAGE_SCN_MEM_READ | \
> > + IMAGE_SCN_MEM_EXECUTE /* Characteristics */
> > +
> > + .ascii ".data\0\0\0"
> > + .long _end - __initdata_begin /* VirtualSize */
> > + .long __initdata_begin - _head /* VirtualAddress */
> > + .long _edata - __initdata_begin /* SizeOfRawData */
> > + .long __initdata_begin - _head /* PointerToRawData */
> > +
> > + .long 0 /* PointerToRelocations */
> > + .long 0 /* PointerToLineNumbers */
> > + .short 0 /* NumberOfRelocations */
> > + .short 0 /* NumberOfLineNumbers */
> > + .long IMAGE_SCN_CNT_INITIALIZED_DATA | \
> > + IMAGE_SCN_MEM_READ | \
> > + IMAGE_SCN_MEM_WRITE /* Characteristics */
> > +
> > + .org 0x20e
> > + .word kernel_version - 512 - _head
> > +
> > + .set .Lsection_count, (. - .Lsection_table) / 40
> > +.Lefi_header_end:
> > + .endm
> > diff --git a/arch/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c
> > new file mode 100644
> > index 000000000000..69ebdd4220ec
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/efi.c
> > @@ -0,0 +1,229 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * EFI initialization
> > + *
> > + * Author: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
> > + * Huacai Chen <chenhuacai@xxxxxxxxxxx>
> > + *
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +
> > +#include <linux/acpi.h>
> > +#include <linux/efi.h>
> > +#include <linux/efi-bgrt.h>
> > +#include <linux/init.h>
> > +#include <linux/kernel.h>
> > +#include <linux/export.h>
> > +#include <linux/io.h>
> > +#include <linux/kobject.h>
> > +#include <linux/memblock.h>
> > +#include <linux/reboot.h>
> > +#include <linux/uaccess.h>
> > +
> > +#include <asm/early_ioremap.h>
> > +#include <asm/efi.h>
> > +#include <asm/tlb.h>
> > +#include <asm/loongson.h>
> > +
> > +static unsigned long efi_nr_tables;
> > +static unsigned long efi_config_table;
> > +static unsigned long screen_info_table __initdata = EFI_INVALID_TABLE_ADDR;
> > +
> > +static efi_system_table_t *efi_systab;
> > +static efi_config_table_type_t arch_tables[] __initdata = {
> > + {LINUX_EFI_LARCH_SCREEN_INFO_TABLE_GUID, &screen_info_table, "SINFO"},
> > + {},
> > +};
> > +
> > +static void __init init_screen_info(void)
> > +{
> > + struct screen_info *si;
> > +
> > + if (screen_info_table == EFI_INVALID_TABLE_ADDR)
> > + return;
> > +
> > + si = early_memremap_ro(screen_info_table, sizeof(*si));
> > + if (!si) {
> > + pr_err("Could not map screen_info config table\n");
> > + return;
> > + }
> > + screen_info = *si;
> > + early_memunmap(si, sizeof(*si));
> > +
> > + if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI)
> > + memblock_reserve(screen_info.lfb_base, screen_info.lfb_size);
> > +}
> > +
> > +static void __init create_tlb(u32 index, u64 vppn, u32 ps, u32 mat)
> > +{
> > + unsigned long tlblo0, tlblo1;
> > +
> > + write_csr_pagesize(ps);
> > +
> > + tlblo0 = vppn | CSR_TLBLO0_V | CSR_TLBLO0_WE |
> > + CSR_TLBLO0_GLOBAL | (mat << CSR_TLBLO0_CCA_SHIFT);
> > + tlblo1 = tlblo0 + (1 << ps);
> > +
> > + csr_writeq(vppn, LOONGARCH_CSR_TLBEHI);
> > + csr_writeq(tlblo0, LOONGARCH_CSR_TLBELO0);
> > + csr_writeq(tlblo1, LOONGARCH_CSR_TLBELO1);
> > + csr_xchgl(0, CSR_TLBIDX_EHINV, LOONGARCH_CSR_TLBIDX);
> > + csr_xchgl(index, CSR_TLBIDX_IDX, LOONGARCH_CSR_TLBIDX);
> > +
> > + tlb_write_indexed();
> > +}
> > +
> > +#define MTLB_ENTRY_INDEX 0x800
> > +
> > +/* Create VA == PA mapping as UEFI */
> > +static void __init fix_efi_mapping(void)
> > +{
> > + unsigned int index = MTLB_ENTRY_INDEX;
> > + unsigned int tlbnr = boot_cpu_data.tlbsizemtlb - 2;
> > + unsigned long i, vppn;
> > +
> > + /* Low Memory, Cached */
> > + create_tlb(index++, 0x00000000, PS_128M, 1);
> > + /* MMIO Registers, Uncached */
> > + create_tlb(index++, 0x10000000, PS_128M, 0);
> > +
> > + /* High Memory, Cached */
> > + for (i = 0; i < tlbnr; i++) {
> > + vppn = 0x80000000ULL + (i * SZ_2G);
> > + create_tlb(index++, vppn, PS_1G, 1);
> > + }
> > +}
> > +
> > +/*
> > + * set_virtual_map() - create a virtual mapping for the EFI memory map and call
> > + * efi_set_virtual_address_map enter virtual for runtime service
> > + *
> > + * This function populates the virt_addr fields of all memory region descriptors
> > + * in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors
> > + * are also copied to @runtime_map, and their total count is returned in @count.
> > + */
> > +static unsigned int __init set_virtual_map(void)
> > +{
> > + int count = 0;
> > + unsigned int size;
> > + unsigned long attr;
> > + efi_status_t status;
> > + efi_runtime_services_t *rt;
> > + efi_set_virtual_address_map_t *svam;
> > + efi_memory_desc_t *in, runtime_map[32];
> > +
> > + size = sizeof(efi_memory_desc_t);
> > +
> > + for_each_efi_memory_desc(in) {
> > + attr = in->attribute;
> > + if (!(attr & EFI_MEMORY_RUNTIME))
> > + continue;
> > +
> > + if (attr & (EFI_MEMORY_WB | EFI_MEMORY_WT))
> > + in->virt_addr = TO_CACHE(in->phys_addr);
> > + else
> > + in->virt_addr = TO_UNCACHE(in->phys_addr);
> > +
> > + memcpy(&runtime_map[count++], in, size);
> > + }
> > +
> > + rt = early_memremap_ro((unsigned long)efi_systab->runtime, sizeof(*rt));
> > +
> > + /* Install the new virtual address map */
> > + svam = rt->set_virtual_address_map;
> > +
> > + fix_efi_mapping();
> > +
> > + status = svam(size * count, size, efi.memmap.desc_version,
> > + (efi_memory_desc_t *)TO_PHYS((unsigned long)runtime_map));
> > +
> > + local_flush_tlb_all();
> > + write_csr_pagesize(PS_DEFAULT_SIZE);
> > +
> > + if (status != EFI_SUCCESS)
> > + return -1;
> > +
> > + return 0;
> > +}
> > +
> > +void __init efi_runtime_init(void)
> > +{
> > + efi_status_t status;
> > +
> > + if (!efi_enabled(EFI_BOOT))
> > + return;
> > +
> > + if (!efi_systab->runtime)
> > + return;
> > +
> > + status = set_virtual_map();
> > + if (status < 0)
> > + return;
> > +
> > + if (efi_runtime_disabled()) {
> > + pr_info("EFI runtime services will be disabled.\n");
> > + return;
> > + }
> > +
> > + efi.runtime = (efi_runtime_services_t *)efi_systab->runtime;
> > + efi.runtime_version = (unsigned int)efi.runtime->hdr.revision;
> > +
> > + efi_native_runtime_setup();
> > + set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
> > +}
> > +
> > +void __init efi_init(void)
> > +{
> > + int size;
> > + void *config_tables;
> > +
> > + if (!efi_system_table)
> > + return;
> > +
> > + efi_systab = (efi_system_table_t *)early_memremap_ro(efi_system_table, sizeof(efi_systab));
> > + if (!efi_systab) {
> > + pr_err("Can't find EFI system table.\n");
> > + return;
> > + }
> > +
> > + set_bit(EFI_64BIT, &efi.flags);
> > + efi_nr_tables = efi_systab->nr_tables;
> > + efi_config_table = (unsigned long)efi_systab->tables;
> > +
> > + size = sizeof(efi_config_table_t);
> > + config_tables = early_memremap(efi_config_table, efi_nr_tables * size);
> > + efi_config_parse_tables(config_tables, efi_systab->nr_tables, arch_tables);
> > + early_memunmap(config_tables, efi_nr_tables * size);
> > +
> > + init_screen_info();
> > +}
> > +
> > +static ssize_t boardinfo_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf)
> > +{
> > + return sprintf(buf,
> > + "BIOS Information\n"
> > + "Vendor\t\t\t: %s\n"
> > + "Version\t\t\t: %s\n"
> > + "ROM Size\t\t: %d KB\n"
> > + "Release Date\t\t: %s\n\n"
> > + "Board Information\n"
> > + "Manufacturer\t\t: %s\n"
> > + "Board Name\t\t: %s\n"
> > + "Family\t\t\t: LOONGSON64\n\n",
> > + b_info.bios_vendor, b_info.bios_version,
> > + b_info.bios_size, b_info.bios_release_date,
> > + b_info.board_vendor, b_info.board_name);
> > +}
> > +
> > +static struct kobj_attribute boardinfo_attr = __ATTR(boardinfo, 0444,
> > + boardinfo_show, NULL);
> > +
> > +static int __init boardinfo_init(void)
> > +{
> > + if (!efi_kobj)
> > + return -EINVAL;
> > +
> > + return sysfs_create_file(efi_kobj, &boardinfo_attr.attr);
> > +}
> > +late_initcall(boardinfo_init);
> > diff --git a/arch/loongarch/kernel/env.c b/arch/loongarch/kernel/env.c
> > new file mode 100644
> > index 000000000000..bf2593f1e536
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/env.c
> > @@ -0,0 +1,70 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Author: Huacai Chen <chenhuacai@xxxxxxxxxxx>
> > + *
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/acpi.h>
> > +#include <linux/efi.h>
> > +#include <linux/export.h>
> > +#include <linux/memblock.h>
> > +#include <linux/of_fdt.h>
> > +#include <asm/early_ioremap.h>
> > +#include <asm/bootinfo.h>
> > +#include <asm/loongson.h>
> > +
> > +u64 efi_system_table;
> > +struct loongson_system_configuration loongson_sysconf;
> > +EXPORT_SYMBOL(loongson_sysconf);
> > +
> > +u64 loongson_chipcfg[MAX_PACKAGES];
> > +u64 loongson_chiptemp[MAX_PACKAGES];
> > +u64 loongson_freqctrl[MAX_PACKAGES];
> > +unsigned long long smp_group[MAX_PACKAGES];
> > +
> > +static void __init register_addrs_set(u64 *registers, const u64 addr, int num)
> > +{
> > + u64 i;
> > +
> > + for (i = 0; i < num; i++) {
> > + *registers = (i << 44) | addr;
> > + registers++;
> > + }
> > +}
> > +
> > +void __init init_environ(void)
> > +{
> > + int efi_boot = fw_arg0;
> > + struct efi_memory_map_data data;
> > + void *fdt_ptr = early_memremap_ro(fw_arg1, SZ_64K);
> > +
> > + if (efi_boot)
> > + set_bit(EFI_BOOT, &efi.flags);
> > + else
> > + clear_bit(EFI_BOOT, &efi.flags);
> > +
> > + early_init_dt_scan(fdt_ptr);
> > + early_init_fdt_reserve_self();
> > + efi_system_table = efi_get_fdt_params(&data);
> > +
> > + efi_memmap_init_early(&data);
> Why not die in case efi_get_fdt_params or efi_memmap_init_early fails? I
> know in these cases it'll still die afterwards, because we're so early
> there's little room for error, but panicking seems more clear.
At least, no systemtable and no efi_mmap is acceptable for full FDT
system (non-ACPI system). And for ACPI system, systemtable and
efi_mmap do exist.

Huacai
> > + memblock_reserve(data.phys_map & PAGE_MASK,
> > + PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
> > +
> > + register_addrs_set(smp_group, TO_UNCACHE(0x1fe01000), 16);
> > + register_addrs_set(loongson_chipcfg, TO_UNCACHE(0x1fe00180), 16);
> > + register_addrs_set(loongson_chiptemp, TO_UNCACHE(0x1fe0019c), 16);
> > + register_addrs_set(loongson_freqctrl, TO_UNCACHE(0x1fe001d0), 16);
> > +}
> > +
> > +static int __init init_cpu_fullname(void)
> > +{
> > + int cpu;
> > +
> > + if (loongson_sysconf.cpuname && !strncmp(loongson_sysconf.cpuname, "Loongson", 8)) {
> > + for (cpu = 0; cpu < NR_CPUS; cpu++)
> > + __cpu_full_name[cpu] = loongson_sysconf.cpuname;
> > + }
> > + return 0;
> > +}
> > +arch_initcall(init_cpu_fullname);
> > diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S
> > new file mode 100644
> > index 000000000000..a5b4940c98fe
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/head.S
> > @@ -0,0 +1,101 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/init.h>
> > +#include <linux/threads.h>
> > +
> > +#include <asm/addrspace.h>
> > +#include <asm/asm.h>
> > +#include <asm/asmmacro.h>
> > +#include <asm/regdef.h>
> > +#include <asm/loongarch.h>
> > +#include <asm/stackframe.h>
> > +#include <generated/compile.h>
> > +#include <generated/utsrelease.h>
> > +
> > +#ifdef CONFIG_EFI_STUB
> > +
> > +#include "efi-header.S"
> > +
> > + __HEAD
> > +
> > +_head:
> > + .word MZ_MAGIC /* "MZ", MS-DOS header */
> > + .org 0x38
> > +#ifdef CONFIG_32BIT
> > + .ascii "LA32" /* Magic number for BootLoader */
> > +#else
> > + .ascii "LA64" /* Magic number for BootLoader */
> > +#endif
>
> So this is just the *dullest* suggestion from my comment on v10; seems
> we have to live with a lack of sense of humor. ¯\_(ツ)_/¯
>
> Anyway, bottom line is "don't create yet another image header format",
> and this revision fixed the problem in v10. So I have no further problem
> with this.
>
> > + .org 0x3c
> > + .long pe_header - _head /* Offset to the PE header */
> > +
> > +pe_header:
> > + __EFI_PE_HEADER
> > +
> > +SYM_DATA(kernel_asize, .long _end - _text);
> > +SYM_DATA(kernel_fsize, .long _edata - _text);
> > +SYM_DATA(kernel_offset, .long kernel_offset - _text);
> > +
> > +kernel_version:
> > + .ascii UTS_RELEASE " (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ") " UTS_VERSION "\0"
> > +
> > +#endif
> > +
> > + __REF
> > +
> > +SYM_ENTRY(_stext, SYM_L_GLOBAL, SYM_A_NONE)
> > +
> > +SYM_CODE_START(kernel_entry) # kernel entry point
> > +
> > + /* Config direct window and set PG */
> > + li.d t0, CSR_DMW0_INIT # UC, PLV0, 0x8000 xxxx xxxx xxxx
> > + csrwr t0, LOONGARCH_CSR_DMWIN0
> > + li.d t0, CSR_DMW1_INIT # CA, PLV0, 0x9000 xxxx xxxx xxxx
> > + csrwr t0, LOONGARCH_CSR_DMWIN1
> > + /* Enable PG */
> > + li.w t0, 0xb0 # PLV=0, IE=0, PG=1
> > + csrwr t0, LOONGARCH_CSR_CRMD
> > + li.w t0, 0x04 # PLV=0, PIE=1, PWE=0
> > + csrwr t0, LOONGARCH_CSR_PRMD
> > + li.w t0, 0x00 # FPE=0, SXE=0, ASXE=0, BTE=0
> > + csrwr t0, LOONGARCH_CSR_EUEN
> > +
> > + /* We might not get launched at the address the kernel is linked to,
> > + so we jump there. */
> > + la.abs t0, 0f
> > + jirl zero, t0, 0
> > +0:
> > + la t0, __bss_start # clear .bss
> > + st.d zero, t0, 0
> > + la t1, __bss_stop - LONGSIZE
> > +1:
> > + addi.d t0, t0, LONGSIZE
> > + st.d zero, t0, 0
> > + bne t0, t1, 1b
> > +
> > + la t0, fw_arg0
> > + st.d a0, t0, 0 # firmware arguments
> > + la t0, fw_arg1
> > + st.d a1, t0, 0
> > + la t0, fw_arg2
> > + st.d a2, t0, 0
> > +
> > + /* KSave3 used for percpu base, initialized as 0 */
> > + csrwr zero, PERCPU_BASE_KS
> > + /* GPR21 used for percpu base (runtime), initialized as 0 */
> > + or u0, zero, zero
> > +
> > + la tp, init_thread_union
> > + /* Set the SP after an empty pt_regs. */
> > + PTR_LI sp, (_THREAD_SIZE - 32 - PT_SIZE)
> > + PTR_ADD sp, sp, tp
> > + set_saved_sp sp, t0, t1
> > + PTR_ADDI sp, sp, -4 * SZREG # init stack pointer
> > +
> > + bl start_kernel
> > +
> > +SYM_CODE_END(kernel_entry)
> > +
> > +SYM_ENTRY(kernel_entry_end, SYM_L_GLOBAL, SYM_A_NONE)
> > diff --git a/arch/loongarch/kernel/image-vars.h b/arch/loongarch/kernel/image-vars.h
> > new file mode 100644
> > index 000000000000..104e9f0e97fe
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/image-vars.h
> > @@ -0,0 +1,29 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#ifndef __LOONGARCH_KERNEL_IMAGE_VARS_H
> > +#define __LOONGARCH_KERNEL_IMAGE_VARS_H
> > +
> > +#ifdef CONFIG_EFI_STUB
> > +
> > +__efistub_memcmp = memcmp;
> > +__efistub_memchr = memchr;
> > +__efistub_memcpy = memcpy;
> > +__efistub_memmove = memmove;
> > +__efistub_memset = memset;
> > +__efistub_strcat = strcat;
> > +__efistub_strcmp = strcmp;
> > +__efistub_strlen = strlen;
> > +__efistub_strncat = strncat;
> > +__efistub_strnstr = strnstr;
> > +__efistub_strnlen = strnlen;
> > +__efistub_strrchr = strrchr;
> > +__efistub_kernel_entry = kernel_entry;
> > +__efistub_kernel_asize = kernel_asize;
> > +__efistub_kernel_fsize = kernel_fsize;
> > +__efistub_kernel_offset = kernel_offset;
> > +
> > +#endif
> > +
> > +#endif /* __LOONGARCH_KERNEL_IMAGE_VARS_H */
> > diff --git a/arch/loongarch/kernel/mem.c b/arch/loongarch/kernel/mem.c
> > new file mode 100644
> > index 000000000000..7423361b0ebc
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/mem.c
> > @@ -0,0 +1,64 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/efi.h>
> > +#include <linux/initrd.h>
> > +#include <linux/memblock.h>
> > +
> > +#include <asm/bootinfo.h>
> > +#include <asm/loongson.h>
> > +#include <asm/sections.h>
> > +
> > +void __init memblock_init(void)
> > +{
> > + u32 mem_type;
> > + u64 mem_start, mem_end, mem_size;
> > + efi_memory_desc_t *md;
> > +
> > + /* Parse memory information */
> > + for_each_efi_memory_desc(md) {
> > + mem_type = md->type;
> > + mem_start = md->phys_addr;
> > + mem_size = md->num_pages << EFI_PAGE_SHIFT;
> > + mem_end = mem_start + mem_size;
> > +
> > + switch (mem_type) {
> > + case EFI_LOADER_CODE:
> > + case EFI_LOADER_DATA:
> > + case EFI_BOOT_SERVICES_CODE:
> > + case EFI_BOOT_SERVICES_DATA:
> > + case EFI_PERSISTENT_MEMORY:
> > + case EFI_CONVENTIONAL_MEMORY:
> > + memblock_add(mem_start, mem_size);
> > + if (max_low_pfn < (mem_end >> PAGE_SHIFT))
> > + max_low_pfn = mem_end >> PAGE_SHIFT;
> > + break;
> > + case EFI_PAL_CODE:
> > + case EFI_UNUSABLE_MEMORY:
> > + case EFI_ACPI_RECLAIM_MEMORY:
> > + memblock_add(mem_start, mem_size);
> > + fallthrough;
> > + case EFI_RESERVED_TYPE:
> > + case EFI_RUNTIME_SERVICES_CODE:
> > + case EFI_RUNTIME_SERVICES_DATA:
> > + case EFI_MEMORY_MAPPED_IO:
> > + case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
> > + memblock_reserve(mem_start, mem_size);
> > + break;
> > + }
> > + }
> > +
> > + memblock_set_current_limit(PFN_PHYS(max_low_pfn));
> > + memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
> > +
> > + /* Reserve the first 2MB */
> > + memblock_reserve(PHYS_OFFSET, 0x200000);
> > +
> > + /* Reserve the kernel text/data/bss */
> > + memblock_reserve(__pa_symbol(&_text),
> > + __pa_symbol(&_end) - __pa_symbol(&_text));
> > +
> > + /* Reserve the initrd */
> > + reserve_initrd_mem();
> > +}
> > diff --git a/arch/loongarch/kernel/reset.c b/arch/loongarch/kernel/reset.c
> > new file mode 100644
> > index 000000000000..ef484ce43c5c
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/reset.c
> > @@ -0,0 +1,90 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/kernel.h>
> > +#include <linux/acpi.h>
> > +#include <linux/efi.h>
> > +#include <linux/export.h>
> > +#include <linux/pm.h>
> > +#include <linux/types.h>
> > +#include <linux/reboot.h>
> > +#include <linux/delay.h>
> > +#include <linux/console.h>
> > +
> > +#include <acpi/reboot.h>
> > +#include <asm/compiler.h>
> > +#include <asm/idle.h>
> > +#include <asm/loongarch.h>
> > +#include <asm/reboot.h>
> > +
> > +static void default_halt(void)
> > +{
> > + local_irq_disable();
> > + clear_csr_ecfg(ECFG0_IM);
> > +
> > + pr_notice("\n\n** You can safely turn off the power now **\n\n");
> > + console_flush_on_panic(CONSOLE_FLUSH_PENDING);
> > +
> > + while (true) {
> > + __arch_cpu_idle();
> > + }
> > +}
> > +
> > +static void default_poweroff(void)
> > +{
> > +#ifdef CONFIG_EFI
> > + efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
> > +#endif
> > + while (true) {
> > + __arch_cpu_idle();
> > + }
> > +}
> > +
> > +static void default_restart(void)
> > +{
> > +#ifdef CONFIG_EFI
> > + if (efi_capsule_pending(NULL))
> > + efi_reboot(REBOOT_WARM, NULL);
> > + else
> > + efi_reboot(REBOOT_COLD, NULL);
> > +#endif
> > + if (!acpi_disabled)
> > + acpi_reboot();
> > +
> > + while (true) {
> > + __arch_cpu_idle();
> > + }
> > +}
> > +
> > +void (*pm_restart)(void);
> > +EXPORT_SYMBOL(pm_restart);
> > +
> > +void (*pm_power_off)(void);
> > +EXPORT_SYMBOL(pm_power_off);
> > +
> > +void machine_halt(void)
> > +{
> > + default_halt();
> > +}
> > +
> > +void machine_power_off(void)
> > +{
> > + pm_power_off();
> > +}
> > +
> > +void machine_restart(char *command)
> > +{
> > + do_kernel_restart(command);
> > + pm_restart();
> > +}
> > +
> > +static int __init loongarch_reboot_setup(void)
> > +{
> > + pm_restart = default_restart;
> > + pm_power_off = default_poweroff;
> > +
> > + return 0;
> > +}
> > +
> > +arch_initcall(loongarch_reboot_setup);
> > diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
> > new file mode 100644
> > index 000000000000..827d07204e62
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/setup.c
> > @@ -0,0 +1,348 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + *
> > + * Derived from MIPS:
> > + * Copyright (C) 1995 Linus Torvalds
> > + * Copyright (C) 1995 Waldorf Electronics
> > + * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
> > + * Copyright (C) 1996 Stoned Elipot
> > + * Copyright (C) 1999 Silicon Graphics, Inc.
> > + * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki
> > + */
> > +#include <linux/init.h>
> > +#include <linux/acpi.h>
> > +#include <linux/dmi.h>
> > +#include <linux/efi.h>
> > +#include <linux/export.h>
> > +#include <linux/screen_info.h>
> > +#include <linux/memblock.h>
> > +#include <linux/initrd.h>
> > +#include <linux/ioport.h>
> > +#include <linux/root_dev.h>
> > +#include <linux/console.h>
> > +#include <linux/pfn.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/sizes.h>
> > +#include <linux/device.h>
> > +#include <linux/dma-map-ops.h>
> > +#include <linux/swiotlb.h>
> > +
> > +#include <asm/addrspace.h>
> > +#include <asm/bootinfo.h>
> > +#include <asm/cache.h>
> > +#include <asm/cpu.h>
> > +#include <asm/dma.h>
> > +#include <asm/efi.h>
> > +#include <asm/loongson.h>
> > +#include <asm/pgalloc.h>
> > +#include <asm/sections.h>
> > +#include <asm/setup.h>
> > +#include <asm/time.h>
> > +
> > +#define SMBIOS_BIOSSIZE_OFFSET 0x09
> > +#define SMBIOS_BIOSEXTERN_OFFSET 0x13
> > +#define SMBIOS_FREQLOW_OFFSET 0x16
> > +#define SMBIOS_FREQHIGH_OFFSET 0x17
> > +#define SMBIOS_FREQLOW_MASK 0xFF
> > +#define SMBIOS_CORE_PACKAGE_OFFSET 0x23
> > +#define LOONGSON_EFI_ENABLE (1 << 3)
> > +
> > +#ifdef CONFIG_VT
> > +struct screen_info screen_info;
> > +#endif
> > +
> > +DEFINE_PER_CPU(unsigned long, kernelsp);
> > +unsigned long fw_arg0, fw_arg1, fw_arg2;
> > +struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly;
> > +
> > +EXPORT_SYMBOL(cpu_data);
> > +
> > +struct loongson_board_info b_info;
> > +static const char dmi_empty_string[] = " ";
> > +
> > +/*
> > + * Setup information
> > + *
> > + * These are initialized so they are in the .data section
> > + */
> > +
> > +static int num_standard_resources;
> > +static struct resource *standard_resources;
> > +
> > +static struct resource code_resource = { .name = "Kernel code", };
> > +static struct resource data_resource = { .name = "Kernel data", };
> > +static struct resource bss_resource = { .name = "Kernel bss", };
> > +
> > +const char *get_system_type(void)
> > +{
> > + return "generic-loongson-machine";
> > +}
> > +
> > +static const char *dmi_string_parse(const struct dmi_header *dm, u8 s)
> > +{
> > + const u8 *bp = ((u8 *) dm) + dm->length;
> > +
> > + if (s) {
> > + s--;
> > + while (s > 0 && *bp) {
> > + bp += strlen(bp) + 1;
> > + s--;
> > + }
> > +
> > + if (*bp != 0) {
> > + size_t len = strlen(bp)+1;
> > + size_t cmp_len = len > 8 ? 8 : len;
> > +
> > + if (!memcmp(bp, dmi_empty_string, cmp_len))
> > + return dmi_empty_string;
> > +
> > + return bp;
> > + }
> > + }
> > +
> > + return "";
> > +}
> > +
> > +static void __init parse_cpu_table(const struct dmi_header *dm)
> > +{
> > + long freq_temp = 0;
> > + char *dmi_data = (char *)dm;
> > +
> > + freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) +
> > + ((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK));
> > + cpu_clock_freq = freq_temp * 1000000;
> > +
> > + loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]);
> > + loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET);
> > +
> > + pr_info("CpuClock = %llu\n", cpu_clock_freq);
> > +}
> > +
> > +static void __init parse_bios_table(const struct dmi_header *dm)
> > +{
> > + int bios_extern;
> > + char *dmi_data = (char *)dm;
> > +
> > + bios_extern = *(dmi_data + SMBIOS_BIOSEXTERN_OFFSET);
> > + b_info.bios_size = *(dmi_data + SMBIOS_BIOSSIZE_OFFSET);
> > +
> > + if (bios_extern & LOONGSON_EFI_ENABLE)
> > + set_bit(EFI_BOOT, &efi.flags);
> > + else
> > + clear_bit(EFI_BOOT, &efi.flags);
> > +}
> > +
> > +static void __init find_tokens(const struct dmi_header *dm, void *dummy)
> > +{
> > + switch (dm->type) {
> > + case 0x0: /* Extern BIOS */
> > + parse_bios_table(dm);
> > + break;
> > + case 0x4: /* Calling interface */
> > + parse_cpu_table(dm);
> > + break;
> > + }
> > +}
> > +static void __init smbios_parse(void)
> > +{
> > + b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR);
> > + b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION);
> > + b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE);
> > + b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR);
> > + b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME);
> > + dmi_walk(find_tokens, NULL);
> > +}
> > +
> > +static int usermem __initdata;
> > +
> > +static int __init early_parse_mem(char *p)
> > +{
> > + phys_addr_t start, size;
> > +
> > + /*
> > + * If a user specifies memory size, we
> > + * blow away any automatically generated
> > + * size.
> > + */
> > + if (usermem == 0) {
> > + usermem = 1;
> > + memblock_remove(memblock_start_of_DRAM(),
> > + memblock_end_of_DRAM() - memblock_start_of_DRAM());
> > + }
> > + start = 0;
> > + size = memparse(p, &p);
> > + if (*p == '@')
> > + start = memparse(p + 1, &p);
> > + else {
> > + pr_err("Invalid format!\n");
> > + return -EINVAL;
> > + }
> > +
> > + memblock_add(start, size);
> > +
> > + return 0;
> > +}
> > +early_param("mem", early_parse_mem);
> > +
> > +void __init platform_init(void)
> > +{
> > + efi_init();
> > +#ifdef CONFIG_ACPI_TABLE_UPGRADE
> > + acpi_table_upgrade();
> > +#endif
> > +#ifdef CONFIG_ACPI
> > + acpi_gbl_use_default_register_widths = false;
> > + acpi_boot_table_init();
> > + acpi_boot_init();
> > +#endif
> > +
> > + dmi_setup();
> > + smbios_parse();
> > + pr_info("The BIOS Version: %s\n", b_info.bios_version);
> > +
> > + efi_runtime_init();
> > +}
> > +
> > +static void __init check_kernel_sections_mem(void)
> > +{
> > + phys_addr_t start = __pa_symbol(&_text);
> > + phys_addr_t size = __pa_symbol(&_end) - start;
> > +
> > + if (!memblock_is_region_memory(start, size)) {
> > + pr_info("Kernel sections are not in the memory maps\n");
> > + memblock_add(start, size);
> > + }
> > +}
> > +
> > +/*
> > + * arch_mem_init - initialize memory management subsystem
> > + */
> > +static void __init arch_mem_init(char **cmdline_p)
> > +{
> > + if (usermem)
> > + pr_info("User-defined physical RAM map overwrite\n");
> > +
> > + check_kernel_sections_mem();
> > +
> > + /*
> > + * In order to reduce the possibility of kernel panic when failed to
> > + * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
> > + * low memory as small as possible before plat_swiotlb_setup(), so
> > + * make sparse_init() using top-down allocation.
> > + */
> > + memblock_set_bottom_up(false);
> > + sparse_init();
> > + memblock_set_bottom_up(true);
> > +
> > + swiotlb_init(1);
> > +
> > + dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
> > +
> > + memblock_dump_all();
> > +
> > + early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
> > +}
> > +
> > +static void __init resource_init(void)
> > +{
> > + long i = 0;
> > + size_t res_size;
> > + struct resource *res;
> > + struct memblock_region *region;
> > +
> > + code_resource.start = __pa_symbol(&_text);
> > + code_resource.end = __pa_symbol(&_etext) - 1;
> > + data_resource.start = __pa_symbol(&_etext);
> > + data_resource.end = __pa_symbol(&_edata) - 1;
> > + bss_resource.start = __pa_symbol(&__bss_start);
> > + bss_resource.end = __pa_symbol(&__bss_stop) - 1;
> > +
> > + num_standard_resources = memblock.memory.cnt;
> > + res_size = num_standard_resources * sizeof(*standard_resources);
> > + standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);
> > +
> > + for_each_mem_region(region) {
> > + res = &standard_resources[i++];
> > + if (!memblock_is_nomap(region)) {
> > + res->name = "System RAM";
> > + res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
> > + res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
> > + res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
> > + } else {
> > + res->name = "Reserved";
> > + res->flags = IORESOURCE_MEM;
> > + res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
> > + res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
> > + }
> > +
> > + request_resource(&iomem_resource, res);
> > +
> > + /*
> > + * We don't know which RAM region contains kernel data,
> > + * so we try it repeatedly and let the resource manager
> > + * test it.
> > + */
> > + request_resource(res, &code_resource);
> > + request_resource(res, &data_resource);
> > + request_resource(res, &bss_resource);
> > + }
> > +}
> > +
> > +static int __init reserve_memblock_reserved_regions(void)
> > +{
> > + u64 i, j;
> > +
> > + for (i = 0; i < num_standard_resources; ++i) {
> > + struct resource *mem = &standard_resources[i];
> > + phys_addr_t r_start, r_end, mem_size = resource_size(mem);
> > +
> > + if (!memblock_is_region_reserved(mem->start, mem_size))
> > + continue;
> > +
> > + for_each_reserved_mem_range(j, &r_start, &r_end) {
> > + resource_size_t start, end;
> > +
> > + start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
> > + end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
> > +
> > + if (start > mem->end || end < mem->start)
> > + continue;
> > +
> > + reserve_region_with_split(mem, start, end, "Reserved");
> > + }
> > + }
> > +
> > + return 0;
> > +}
> > +arch_initcall(reserve_memblock_reserved_regions);
> > +
> > +void __init setup_arch(char **cmdline_p)
> > +{
> > + cpu_probe();
> > + *cmdline_p = boot_command_line;
> > +
> > + init_environ();
> > + memblock_init();
> > + parse_early_param();
> > +
> > + platform_init();
> > + pagetable_init();
> > + arch_mem_init(cmdline_p);
> > +
> > + resource_init();
> > +
> > + paging_init();
> > +}
> > +
> > +static int __init register_gop_device(void)
> > +{
> > + void *pd;
> > +
> > + if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
> > + return 0;
> > + pd = platform_device_register_data(NULL, "efi-framebuffer", 0,
> > + &screen_info, sizeof(screen_info));
> > + return PTR_ERR_OR_ZERO(pd);
> > +}
> > +subsys_initcall(register_gop_device);
> > diff --git a/arch/loongarch/kernel/time.c b/arch/loongarch/kernel/time.c
> > new file mode 100644
> > index 000000000000..5d2b2c6712bc
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/time.c
> > @@ -0,0 +1,220 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Common time service routines for LoongArch machines.
> > + *
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +#include <linux/clockchips.h>
> > +#include <linux/delay.h>
> > +#include <linux/export.h>
> > +#include <linux/init.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/kernel.h>
> > +#include <linux/sched_clock.h>
> > +#include <linux/spinlock.h>
> > +
> > +#include <asm/cpu-features.h>
> > +#include <asm/loongarch.h>
> > +#include <asm/time.h>
> > +
> > +u64 cpu_clock_freq;
> > +EXPORT_SYMBOL(cpu_clock_freq);
> > +u64 const_clock_freq;
> > +EXPORT_SYMBOL(const_clock_freq);
> > +
> > +static DEFINE_RAW_SPINLOCK(state_lock);
> > +static DEFINE_PER_CPU(struct clock_event_device, constant_clockevent_device);
> > +
> > +static void constant_event_handler(struct clock_event_device *dev)
> > +{
> > +}
> > +
> > +irqreturn_t constant_timer_interrupt(int irq, void *data)
> > +{
> > + int cpu = smp_processor_id();
> > + struct clock_event_device *cd;
> > +
> > + /* Clear Timer Interrupt */
> > + write_csr_tintclear(CSR_TINTCLR_TI);
> > + cd = &per_cpu(constant_clockevent_device, cpu);
> > + cd->event_handler(cd);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int constant_set_state_oneshot(struct clock_event_device *evt)
> > +{
> > + unsigned long timer_config;
> > +
> > + raw_spin_lock(&state_lock);
> > +
> > + timer_config = csr_readq(LOONGARCH_CSR_TCFG);
> > + timer_config |= CSR_TCFG_EN;
> > + timer_config &= ~CSR_TCFG_PERIOD;
> > + csr_writeq(timer_config, LOONGARCH_CSR_TCFG);
> > +
> > + raw_spin_unlock(&state_lock);
> > +
> > + return 0;
> > +}
> > +
> > +static int constant_set_state_oneshot_stopped(struct clock_event_device *evt)
> > +{
> > + unsigned long timer_config;
> > +
> > + raw_spin_lock(&state_lock);
> > +
> > + timer_config = csr_readq(LOONGARCH_CSR_TCFG);
> > + timer_config &= ~CSR_TCFG_EN;
> > + csr_writeq(timer_config, LOONGARCH_CSR_TCFG);
> > +
> > + raw_spin_unlock(&state_lock);
> > +
> > + return 0;
> > +}
> > +
> > +static int constant_set_state_periodic(struct clock_event_device *evt)
> > +{
> > + unsigned long period;
> > + unsigned long timer_config;
> > +
> > + raw_spin_lock(&state_lock);
> > +
> > + period = const_clock_freq / HZ;
> > + timer_config = period & CSR_TCFG_VAL;
> > + timer_config |= (CSR_TCFG_PERIOD | CSR_TCFG_EN);
> > + csr_writeq(timer_config, LOONGARCH_CSR_TCFG);
> > +
> > + raw_spin_unlock(&state_lock);
> > +
> > + return 0;
> > +}
> > +
> > +static int constant_set_state_shutdown(struct clock_event_device *evt)
> > +{
> > + return 0;
> > +}
> > +
> > +static int constant_timer_next_event(unsigned long delta, struct clock_event_device *evt)
> > +{
> > + unsigned long timer_config;
> > +
> > + delta &= CSR_TCFG_VAL;
> > + timer_config = delta | CSR_TCFG_EN;
> > + csr_writeq(timer_config, LOONGARCH_CSR_TCFG);
> > +
> > + return 0;
> > +}
> > +
> > +static unsigned long __init get_loops_per_jiffy(void)
> > +{
> > + unsigned long lpj = (unsigned long)const_clock_freq;
> > +
> > + do_div(lpj, HZ);
> > +
> > + return lpj;
> > +}
> > +
> > +static long init_timeval;
> > +
> > +void sync_counter(void)
> > +{
> > + /* Ensure counter begin at 0 */
> > + csr_writeq(-init_timeval, LOONGARCH_CSR_CNTC);
> > +}
> > +
> > +int constant_clockevent_init(void)
> > +{
> > + unsigned int irq;
> > + unsigned int cpu = smp_processor_id();
> > + unsigned long min_delta = 0x600;
> > + unsigned long max_delta = (1UL << 48) - 1;
> > + struct clock_event_device *cd;
> > + static int timer_irq_installed = 0;
> > +
> > + irq = get_timer_irq();
> > +
> > + cd = &per_cpu(constant_clockevent_device, cpu);
> > +
> > + cd->name = "Constant";
> > + cd->features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_PERCPU;
> > +
> > + cd->irq = irq;
> > + cd->rating = 320;
> > + cd->cpumask = cpumask_of(cpu);
> > + cd->set_state_oneshot = constant_set_state_oneshot;
> > + cd->set_state_oneshot_stopped = constant_set_state_oneshot_stopped;
> > + cd->set_state_periodic = constant_set_state_periodic;
> > + cd->set_state_shutdown = constant_set_state_shutdown;
> > + cd->set_next_event = constant_timer_next_event;
> > + cd->event_handler = constant_event_handler;
> > +
> > + clockevents_config_and_register(cd, const_clock_freq, min_delta, max_delta);
> > +
> > + if (timer_irq_installed)
> > + return 0;
> > +
> > + timer_irq_installed = 1;
> > +
> > + sync_counter();
> > +
> > + if (request_irq(irq, constant_timer_interrupt, IRQF_PERCPU | IRQF_TIMER, "timer", NULL))
> > + pr_err("Failed to request irq %d (timer)\n", irq);
> > +
> > + lpj_fine = get_loops_per_jiffy();
> > + pr_info("Constant clock event device register\n");
> > +
> > + return 0;
> > +}
> > +
> > +static u64 read_const_counter(struct clocksource *clk)
> > +{
> > + return drdtime();
> > +}
> > +
> > +static u64 native_sched_clock(void)
> > +{
> > + return read_const_counter(NULL);
> > +}
> > +
> > +static struct clocksource clocksource_const = {
> > + .name = "Constant",
> > + .rating = 400,
> > + .read = read_const_counter,
> > + .mask = CLOCKSOURCE_MASK(64),
> > + .flags = CLOCK_SOURCE_IS_CONTINUOUS,
> > + .mult = 0,
> > + .shift = 10,
> > +};
> > +
> > +int __init constant_clocksource_init(void)
> > +{
> > + int res;
> > + unsigned long freq;
> > +
> > + freq = const_clock_freq;
> > +
> > + clocksource_const.mult =
> > + clocksource_hz2mult(freq, clocksource_const.shift);
> > +
> > + res = clocksource_register_hz(&clocksource_const, freq);
> > +
> > + sched_clock_register(native_sched_clock, 64, freq);
> > +
> > + pr_info("Constant clock source device register\n");
> > +
> > + return res;
> > +}
> > +
> > +void __init time_init(void)
> > +{
> > + if (!cpu_has_cpucfg)
> > + const_clock_freq = cpu_clock_freq;
> > + else
> > + const_clock_freq = calc_const_freq();
> > +
> > + init_timeval = drdtime() - csr_readq(LOONGARCH_CSR_CNTC);
> > +
> > + constant_clockevent_init();
> > + constant_clocksource_init();
> > +}
> > diff --git a/arch/loongarch/kernel/topology.c b/arch/loongarch/kernel/topology.c
> > new file mode 100644
> > index 000000000000..3b2cbb95875b
> > --- /dev/null
> > +++ b/arch/loongarch/kernel/topology.c
> > @@ -0,0 +1,13 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +#include <linux/cpu.h>
> > +#include <linux/init.h>
> > +#include <linux/percpu.h>
> > +
> > +static struct cpu cpu_device;
> > +
> > +static int __init topology_init(void)
> > +{
> > + return register_cpu(&cpu_device, 0);
> > +}
> > +
> > +subsys_initcall(topology_init);
> > diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
> > index 2c3dac5ecb36..c47fa1ef9387 100644
> > --- a/drivers/firmware/efi/Kconfig
> > +++ b/drivers/firmware/efi/Kconfig
> > @@ -106,7 +106,7 @@ config EFI_GENERIC_STUB
> >
> > config EFI_ARMSTUB_DTB_LOADER
> > bool "Enable the DTB loader"
> > - depends on EFI_GENERIC_STUB && !RISCV
> > + depends on EFI_GENERIC_STUB && !RISCV && !LOONGARCH
> > default y
> > help
> > Select this config option to add support for the dtb= command
> > diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
> > index d0537573501e..1588c61939e7 100644
> > --- a/drivers/firmware/efi/libstub/Makefile
> > +++ b/drivers/firmware/efi/libstub/Makefile
> > @@ -26,6 +26,8 @@ cflags-$(CONFIG_ARM) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
> > $(call cc-option,-mno-single-pic-base)
> > cflags-$(CONFIG_RISCV) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
> > -fpic
> > +cflags-$(CONFIG_LOONGARCH) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \
> > + -fpic
> >
> > cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt
> >
> > @@ -70,6 +72,8 @@ lib-$(CONFIG_ARM) += arm32-stub.o
> > lib-$(CONFIG_ARM64) += arm64-stub.o
> > lib-$(CONFIG_X86) += x86-stub.o
> > lib-$(CONFIG_RISCV) += riscv-stub.o
> > +lib-$(CONFIG_LOONGARCH) += loongarch-stub.o
> > +
> > CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
> >
> > # Even when -mbranch-protection=none is set, Clang will generate a
> > @@ -125,6 +129,12 @@ STUBCOPY_FLAGS-$(CONFIG_RISCV) += --prefix-alloc-sections=.init \
> > --prefix-symbols=__efistub_
> > STUBCOPY_RELOC-$(CONFIG_RISCV) := R_RISCV_HI20
> >
> > +# For LoongArch, keep all the symbols in .init section and make sure that no
> > +# absolute symbols references doesn't exist.
> > +STUBCOPY_FLAGS-$(CONFIG_LOONGARCH) += --prefix-alloc-sections=.init \
> > + --prefix-symbols=__efistub_
> > +STUBCOPY_RELOC-$(CONFIG_LOONGARCH) := R_LARCH_MARK_LA
> > +
> > $(obj)/%.stub.o: $(obj)/%.o FORCE
> > $(call if_changed,stubcopy)
> >
> > diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
> > index 3d972061c1b0..f612cfceda22 100644
> > --- a/drivers/firmware/efi/libstub/efi-stub-helper.c
> > +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
> > @@ -21,7 +21,7 @@
> > bool efi_nochunk;
> > bool efi_nokaslr = !IS_ENABLED(CONFIG_RANDOMIZE_BASE);
> > int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
> > -bool efi_novamap;
> > +bool efi_novamap = IS_ENABLED(CONFIG_LOONGARCH); /* LoongArch call svam() in kernel */
> >
> > static bool efi_noinitrd;
> > static bool efi_nosoftreserve;
> > diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c
> > index da93864d7abc..ffc02880a344 100644
> > --- a/drivers/firmware/efi/libstub/efi-stub.c
> > +++ b/drivers/firmware/efi/libstub/efi-stub.c
> > @@ -40,7 +40,7 @@
> >
> > #ifdef CONFIG_ARM64
> > # define EFI_RT_VIRTUAL_LIMIT DEFAULT_MAP_WINDOW_64
> > -#elif defined(CONFIG_RISCV)
> > +#elif defined(CONFIG_RISCV) || defined(CONFIG_LOONGARCH)
> > # define EFI_RT_VIRTUAL_LIMIT TASK_SIZE_MIN
> > #else
> > # define EFI_RT_VIRTUAL_LIMIT TASK_SIZE
> > diff --git a/drivers/firmware/efi/libstub/loongarch-stub.c b/drivers/firmware/efi/libstub/loongarch-stub.c
> > new file mode 100644
> > index 000000000000..25bf7f8ff00c
> > --- /dev/null
> > +++ b/drivers/firmware/efi/libstub/loongarch-stub.c
> > @@ -0,0 +1,87 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Author: Yun Liu <liuyun@xxxxxxxxxxx>
> > + * Huacai Chen <chenhuacai@xxxxxxxxxxx>
> > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> > + */
> > +
> > +#include <linux/efi.h>
> > +#include <asm/efi.h>
> > +#include <asm/addrspace.h>
> > +#include "efistub.h"
> > +
> > +typedef void __noreturn (*kernel_entry_t)(bool efi, unsigned long fdt);
> > +
> > +extern int kernel_asize;
> > +extern int kernel_fsize;
> > +extern int kernel_offset;
> > +extern kernel_entry_t kernel_entry;
> > +
> > +static efi_guid_t screen_info_guid = LINUX_EFI_LARCH_SCREEN_INFO_TABLE_GUID;
> > +
> > +struct screen_info *alloc_screen_info(void)
> > +{
> > + efi_status_t status;
> > + struct screen_info *si;
> > +
> > + status = efi_bs_call(allocate_pool,
> > + EFI_RUNTIME_SERVICES_DATA, sizeof(*si), (void **)&si);
> > + if (status != EFI_SUCCESS)
> > + return NULL;
> > +
> > + status = efi_bs_call(install_configuration_table, &screen_info_guid, si);
> > + if (status == EFI_SUCCESS)
> > + return si;
> > +
> > + efi_bs_call(free_pool, si);
> > +
> > + return NULL;
> > +}
> > +
> > +void free_screen_info(struct screen_info *si)
> > +{
> > + if (!si)
> > + return;
> > +
> > + efi_bs_call(install_configuration_table, &screen_info_guid, NULL);
> > + efi_bs_call(free_pool, si);
> > +}
> > +
> > +efi_status_t check_platform_features(void)
> > +{
> > + /* Config Direct Mapping */
> > + csr_writeq(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
> > + csr_writeq(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
> > +
> > + return EFI_SUCCESS;
> > +}
> > +
> > +efi_status_t handle_kernel_image(unsigned long *image_addr,
> > + unsigned long *image_size,
> > + unsigned long *reserve_addr,
> > + unsigned long *reserve_size,
> > + efi_loaded_image_t *image)
> > +{
> > + efi_status_t status;
> > + unsigned long kernel_addr = 0;
> > +
> > + kernel_addr = (unsigned long)&kernel_offset - kernel_offset;
> > +
> > + status = efi_relocate_kernel(&kernel_addr, kernel_fsize, kernel_asize,
> > + PHYSADDR(VMLINUX_LOAD_ADDRESS), SZ_2M, 0x0);
> > +
> > + *image_addr = kernel_addr;
> > + *image_size = kernel_asize;
> > +
> > + return status;
> > +}
> > +
> > +void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt, unsigned long fdt_size)
> > +{
> > + kernel_entry_t real_kernel_entry;
> > +
> > + real_kernel_entry = (kernel_entry_t)
> > + ((unsigned long)&kernel_entry - entrypoint + VMLINUX_LOAD_ADDRESS);
> > +
> > + real_kernel_entry(true, fdt);
> > +}
> > diff --git a/include/linux/efi.h b/include/linux/efi.h
> > index ccd4d3f91c98..559fabdb6b7d 100644
> > --- a/include/linux/efi.h
> > +++ b/include/linux/efi.h
> > @@ -397,6 +397,7 @@ void efi_native_runtime_setup(void);
> > * associated with ConOut
> > */
> > #define LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID EFI_GUID(0xe03fc20a, 0x85dc, 0x406e, 0xb9, 0x0e, 0x4a, 0xb5, 0x02, 0x37, 0x1d, 0x95)
> > +#define LINUX_EFI_LARCH_SCREEN_INFO_TABLE_GUID EFI_GUID(0x07fd51a6, 0x9532, 0x926f, 0x51, 0xdc, 0x6a, 0x63, 0x60, 0x2f, 0x84, 0xb4)
> > #define LINUX_EFI_ARM_CPU_STATE_TABLE_GUID EFI_GUID(0xef79e4aa, 0x3c3d, 0x4989, 0xb9, 0x02, 0x07, 0xa9, 0x43, 0xe5, 0x50, 0xd2)
> > #define LINUX_EFI_LOADER_ENTRY_GUID EFI_GUID(0x4a67b082, 0x0a4c, 0x41cf, 0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f)
> > #define LINUX_EFI_RANDOM_SEED_TABLE_GUID EFI_GUID(0x1ce1e5bc, 0x7ceb, 0x42f2, 0x81, 0xe5, 0x8a, 0xad, 0xf1, 0x80, 0xf5, 0x7b)
> > diff --git a/include/linux/pe.h b/include/linux/pe.h
> > index daf09ffffe38..f4bb0b6a416d 100644
> > --- a/include/linux/pe.h
> > +++ b/include/linux/pe.h
> > @@ -65,6 +65,7 @@
> > #define IMAGE_FILE_MACHINE_SH5 0x01a8
> > #define IMAGE_FILE_MACHINE_THUMB 0x01c2
> > #define IMAGE_FILE_MACHINE_WCEMIPSV2 0x0169
> > +#define IMAGE_FILE_MACHINE_LOONGARCH 0x6264
>
> This should be IMAGE_FILE_MACHINE_LOONGARCH64, as shown in the PE format
> spec [1]. You may or may not want add IMAGE_FILE_MACHINE_LOONGARCH32 too.
>
> [1]: https://docs.microsoft.com/en-us/windows/win32/debug/pe-format
>
> >
> > /* flags */
> > #define IMAGE_FILE_RELOCS_STRIPPED 0x0001
>
> So all of this mostly look good, except that I can't test the patch
> (actually, the series) because no compatible firmware nor emulator is
> available. I've contacted the Loongson people working on QEMU though,
> and they might have something to share in the following days.
>
> With the minor points above addressed:
>
> Reviewed-by: WANG Xuerui <git@xxxxxxxxxx>
>

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