[PATCH] arch/tile: support kexec() for tilegx
From: Chris Metcalf
Date: Fri Mar 30 2012 - 18:55:07 EST
Signed-off-by: Chris Metcalf <cmetcalf@xxxxxxxxxx>
---
arch/tile/include/asm/kexec.h | 12 ++
arch/tile/kernel/Makefile | 2 +-
arch/tile/kernel/machine_kexec.c | 35 +++-
arch/tile/kernel/relocate_kernel.S | 280 ---------------------------------
arch/tile/kernel/relocate_kernel_32.S | 280 +++++++++++++++++++++++++++++++++
arch/tile/kernel/relocate_kernel_64.S | 260 ++++++++++++++++++++++++++++++
6 files changed, 580 insertions(+), 289 deletions(-)
delete mode 100644 arch/tile/kernel/relocate_kernel.S
create mode 100644 arch/tile/kernel/relocate_kernel_32.S
create mode 100644 arch/tile/kernel/relocate_kernel_64.S
diff --git a/arch/tile/include/asm/kexec.h b/arch/tile/include/asm/kexec.h
index c11a6cc..fc98ccf 100644
--- a/arch/tile/include/asm/kexec.h
+++ b/arch/tile/include/asm/kexec.h
@@ -19,12 +19,24 @@
#include <asm/page.h>
+#ifndef __tilegx__
/* Maximum physical address we can use pages from. */
#define KEXEC_SOURCE_MEMORY_LIMIT TASK_SIZE
/* Maximum address we can reach in physical address mode. */
#define KEXEC_DESTINATION_MEMORY_LIMIT TASK_SIZE
/* Maximum address we can use for the control code buffer. */
#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
+#else
+/* We need to limit the memory below PGDIR_SIZE since
+ * we only setup page table for [0, PGDIR_SIZE) before final kexec.
+ */
+/* Maximum physical address we can use pages from. */
+#define KEXEC_SOURCE_MEMORY_LIMIT PGDIR_SIZE
+/* Maximum address we can reach in physical address mode. */
+#define KEXEC_DESTINATION_MEMORY_LIMIT PGDIR_SIZE
+/* Maximum address we can use for the control code buffer. */
+#define KEXEC_CONTROL_MEMORY_LIMIT PGDIR_SIZE
+#endif
#define KEXEC_CONTROL_PAGE_SIZE PAGE_SIZE
diff --git a/arch/tile/kernel/Makefile b/arch/tile/kernel/Makefile
index d6261e4..f19116d 100644
--- a/arch/tile/kernel/Makefile
+++ b/arch/tile/kernel/Makefile
@@ -13,5 +13,5 @@ obj-$(CONFIG_COMPAT) += compat.o compat_signal.o
obj-$(CONFIG_SMP) += smpboot.o smp.o tlb.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
-obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
+obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel_$(BITS).o
obj-$(CONFIG_PCI) += pci.o
diff --git a/arch/tile/kernel/machine_kexec.c b/arch/tile/kernel/machine_kexec.c
index b0fa37c..f0b54a9 100644
--- a/arch/tile/kernel/machine_kexec.c
+++ b/arch/tile/kernel/machine_kexec.c
@@ -31,6 +31,8 @@
#include <asm/pgalloc.h>
#include <asm/cacheflush.h>
#include <asm/checksum.h>
+#include <asm/tlbflush.h>
+#include <asm/homecache.h>
#include <hv/hypervisor.h>
@@ -222,11 +224,22 @@ struct page *kimage_alloc_pages_arch(gfp_t gfp_mask, unsigned int order)
return alloc_pages_node(0, gfp_mask, order);
}
+/*
+ * Address range in which pa=va mapping is set in setup_quasi_va_is_pa().
+ * For tilepro, PAGE_OFFSET is used since this is the largest possbile value
+ * for tilepro, while for tilegx, we limit it to entire middle level page
+ * table which we assume has been allocated and is undoubtedly large enough.
+ */
+#ifndef __tilegx__
+#define QUASI_VA_IS_PA_ADDR_RANGE PAGE_OFFSET
+#else
+#define QUASI_VA_IS_PA_ADDR_RANGE PGDIR_SIZE
+#endif
+
static void setup_quasi_va_is_pa(void)
{
- HV_PTE *pgtable;
HV_PTE pte;
- int i;
+ unsigned long i;
/*
* Flush our TLB to prevent conflicts between the previous contents
@@ -234,16 +247,22 @@ static void setup_quasi_va_is_pa(void)
*/
local_flush_tlb_all();
- /* setup VA is PA, at least up to PAGE_OFFSET */
-
- pgtable = (HV_PTE *)current->mm->pgd;
+ /*
+ * setup VA is PA, at least up to QUASI_VA_IS_PA_ADDR_RANGE.
+ * Note here we assume that level-1 page table is defined by
+ * HPAGE_SIZE.
+ */
pte = hv_pte(_PAGE_KERNEL | _PAGE_HUGE_PAGE);
pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_NO_L3);
-
- for (i = 0; i < pgd_index(PAGE_OFFSET); i++) {
+ for (i = 0; i < (QUASI_VA_IS_PA_ADDR_RANGE >> HPAGE_SHIFT); i++) {
+ unsigned long vaddr = i << HPAGE_SHIFT;
+ pgd_t *pgd = pgd_offset(current->mm, vaddr);
+ pud_t *pud = pud_offset(pgd, vaddr);
+ pte_t *ptep = (pte_t *) pmd_offset(pud, vaddr);
unsigned long pfn = i << (HPAGE_SHIFT - PAGE_SHIFT);
+
if (pfn_valid(pfn))
- __set_pte(&pgtable[i], pfn_pte(pfn, pte));
+ __set_pte(ptep, pfn_pte(pfn, pte));
}
}
diff --git a/arch/tile/kernel/relocate_kernel.S b/arch/tile/kernel/relocate_kernel.S
deleted file mode 100644
index 010b418..0000000
--- a/arch/tile/kernel/relocate_kernel.S
+++ /dev/null
@@ -1,280 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- *
- * copy new kernel into place and then call hv_reexec
- *
- */
-
-#include <linux/linkage.h>
-#include <arch/chip.h>
-#include <asm/page.h>
-#include <hv/hypervisor.h>
-
-#define ___hvb MEM_SV_INTRPT + HV_GLUE_START_CPA
-
-#define ___hv_dispatch(f) (___hvb + (HV_DISPATCH_ENTRY_SIZE * f))
-
-#define ___hv_console_putc ___hv_dispatch(HV_DISPATCH_CONSOLE_PUTC)
-#define ___hv_halt ___hv_dispatch(HV_DISPATCH_HALT)
-#define ___hv_reexec ___hv_dispatch(HV_DISPATCH_REEXEC)
-#define ___hv_flush_remote ___hv_dispatch(HV_DISPATCH_FLUSH_REMOTE)
-
-#undef RELOCATE_NEW_KERNEL_VERBOSE
-
-STD_ENTRY(relocate_new_kernel)
-
- move r30, r0 /* page list */
- move r31, r1 /* address of page we are on */
- move r32, r2 /* start address of new kernel */
-
- shri r1, r1, PAGE_SHIFT
- addi r1, r1, 1
- shli sp, r1, PAGE_SHIFT
- addi sp, sp, -8
- /* we now have a stack (whether we need one or not) */
-
- moveli r40, lo16(___hv_console_putc)
- auli r40, r40, ha16(___hv_console_putc)
-
-#ifdef RELOCATE_NEW_KERNEL_VERBOSE
- moveli r0, 'r'
- jalr r40
-
- moveli r0, '_'
- jalr r40
-
- moveli r0, 'n'
- jalr r40
-
- moveli r0, '_'
- jalr r40
-
- moveli r0, 'k'
- jalr r40
-
- moveli r0, '\n'
- jalr r40
-#endif
-
- /*
- * Throughout this code r30 is pointer to the element of page
- * list we are working on.
- *
- * Normally we get to the next element of the page list by
- * incrementing r30 by four. The exception is if the element
- * on the page list is an IND_INDIRECTION in which case we use
- * the element with the low bits masked off as the new value
- * of r30.
- *
- * To get this started, we need the value passed to us (which
- * will always be an IND_INDIRECTION) in memory somewhere with
- * r30 pointing at it. To do that, we push the value passed
- * to us on the stack and make r30 point to it.
- */
-
- sw sp, r30
- move r30, sp
- addi sp, sp, -8
-
-#if CHIP_HAS_CBOX_HOME_MAP()
- /*
- * On TILEPro, we need to flush all tiles' caches, since we may
- * have been doing hash-for-home caching there. Note that we
- * must do this _after_ we're completely done modifying any memory
- * other than our output buffer (which we know is locally cached).
- * We want the caches to be fully clean when we do the reexec,
- * because the hypervisor is going to do this flush again at that
- * point, and we don't want that second flush to overwrite any memory.
- */
- {
- move r0, zero /* cache_pa */
- move r1, zero
- }
- {
- auli r2, zero, ha16(HV_FLUSH_EVICT_L2) /* cache_control */
- movei r3, -1 /* cache_cpumask; -1 means all client tiles */
- }
- {
- move r4, zero /* tlb_va */
- move r5, zero /* tlb_length */
- }
- {
- move r6, zero /* tlb_pgsize */
- move r7, zero /* tlb_cpumask */
- }
- {
- move r8, zero /* asids */
- moveli r20, lo16(___hv_flush_remote)
- }
- {
- move r9, zero /* asidcount */
- auli r20, r20, ha16(___hv_flush_remote)
- }
-
- jalr r20
-#endif
-
- /* r33 is destination pointer, default to zero */
-
- moveli r33, 0
-
-.Lloop: lw r10, r30
-
- andi r9, r10, 0xf /* low 4 bits tell us what type it is */
- xor r10, r10, r9 /* r10 is now value with low 4 bits stripped */
-
- seqi r0, r9, 0x1 /* IND_DESTINATION */
- bzt r0, .Ltry2
-
- move r33, r10
-
-#ifdef RELOCATE_NEW_KERNEL_VERBOSE
- moveli r0, 'd'
- jalr r40
-#endif
-
- addi r30, r30, 4
- j .Lloop
-
-.Ltry2:
- seqi r0, r9, 0x2 /* IND_INDIRECTION */
- bzt r0, .Ltry4
-
- move r30, r10
-
-#ifdef RELOCATE_NEW_KERNEL_VERBOSE
- moveli r0, 'i'
- jalr r40
-#endif
-
- j .Lloop
-
-.Ltry4:
- seqi r0, r9, 0x4 /* IND_DONE */
- bzt r0, .Ltry8
-
- mf
-
-#ifdef RELOCATE_NEW_KERNEL_VERBOSE
- moveli r0, 'D'
- jalr r40
- moveli r0, '\n'
- jalr r40
-#endif
-
- move r0, r32
- moveli r1, 0 /* arg to hv_reexec is 64 bits */
-
- moveli r41, lo16(___hv_reexec)
- auli r41, r41, ha16(___hv_reexec)
-
- jalr r41
-
- /* we should not get here */
-
- moveli r0, '?'
- jalr r40
- moveli r0, '\n'
- jalr r40
-
- j .Lhalt
-
-.Ltry8: seqi r0, r9, 0x8 /* IND_SOURCE */
- bz r0, .Lerr /* unknown type */
-
- /* copy page at r10 to page at r33 */
-
- move r11, r33
-
- moveli r0, lo16(PAGE_SIZE)
- auli r0, r0, ha16(PAGE_SIZE)
- add r33, r33, r0
-
- /* copy word at r10 to word at r11 until r11 equals r33 */
-
- /* We know page size must be multiple of 16, so we can unroll
- * 16 times safely without any edge case checking.
- *
- * Issue a flush of the destination every 16 words to avoid
- * incoherence when starting the new kernel. (Now this is
- * just good paranoia because the hv_reexec call will also
- * take care of this.)
- */
-
-1:
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0; addi r11, r11, 4 }
- { lw r0, r10; addi r10, r10, 4 }
- { sw r11, r0 }
- { flush r11 ; addi r11, r11, 4 }
-
- seq r0, r33, r11
- bzt r0, 1b
-
-#ifdef RELOCATE_NEW_KERNEL_VERBOSE
- moveli r0, 's'
- jalr r40
-#endif
-
- addi r30, r30, 4
- j .Lloop
-
-
-.Lerr: moveli r0, 'e'
- jalr r40
- moveli r0, 'r'
- jalr r40
- moveli r0, 'r'
- jalr r40
- moveli r0, '\n'
- jalr r40
-.Lhalt:
- moveli r41, lo16(___hv_halt)
- auli r41, r41, ha16(___hv_halt)
-
- jalr r41
- STD_ENDPROC(relocate_new_kernel)
-
- .section .rodata,"a"
-
- .globl relocate_new_kernel_size
-relocate_new_kernel_size:
- .long .Lend_relocate_new_kernel - relocate_new_kernel
diff --git a/arch/tile/kernel/relocate_kernel_32.S b/arch/tile/kernel/relocate_kernel_32.S
new file mode 100644
index 0000000..010b418
--- /dev/null
+++ b/arch/tile/kernel/relocate_kernel_32.S
@@ -0,0 +1,280 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ *
+ * copy new kernel into place and then call hv_reexec
+ *
+ */
+
+#include <linux/linkage.h>
+#include <arch/chip.h>
+#include <asm/page.h>
+#include <hv/hypervisor.h>
+
+#define ___hvb MEM_SV_INTRPT + HV_GLUE_START_CPA
+
+#define ___hv_dispatch(f) (___hvb + (HV_DISPATCH_ENTRY_SIZE * f))
+
+#define ___hv_console_putc ___hv_dispatch(HV_DISPATCH_CONSOLE_PUTC)
+#define ___hv_halt ___hv_dispatch(HV_DISPATCH_HALT)
+#define ___hv_reexec ___hv_dispatch(HV_DISPATCH_REEXEC)
+#define ___hv_flush_remote ___hv_dispatch(HV_DISPATCH_FLUSH_REMOTE)
+
+#undef RELOCATE_NEW_KERNEL_VERBOSE
+
+STD_ENTRY(relocate_new_kernel)
+
+ move r30, r0 /* page list */
+ move r31, r1 /* address of page we are on */
+ move r32, r2 /* start address of new kernel */
+
+ shri r1, r1, PAGE_SHIFT
+ addi r1, r1, 1
+ shli sp, r1, PAGE_SHIFT
+ addi sp, sp, -8
+ /* we now have a stack (whether we need one or not) */
+
+ moveli r40, lo16(___hv_console_putc)
+ auli r40, r40, ha16(___hv_console_putc)
+
+#ifdef RELOCATE_NEW_KERNEL_VERBOSE
+ moveli r0, 'r'
+ jalr r40
+
+ moveli r0, '_'
+ jalr r40
+
+ moveli r0, 'n'
+ jalr r40
+
+ moveli r0, '_'
+ jalr r40
+
+ moveli r0, 'k'
+ jalr r40
+
+ moveli r0, '\n'
+ jalr r40
+#endif
+
+ /*
+ * Throughout this code r30 is pointer to the element of page
+ * list we are working on.
+ *
+ * Normally we get to the next element of the page list by
+ * incrementing r30 by four. The exception is if the element
+ * on the page list is an IND_INDIRECTION in which case we use
+ * the element with the low bits masked off as the new value
+ * of r30.
+ *
+ * To get this started, we need the value passed to us (which
+ * will always be an IND_INDIRECTION) in memory somewhere with
+ * r30 pointing at it. To do that, we push the value passed
+ * to us on the stack and make r30 point to it.
+ */
+
+ sw sp, r30
+ move r30, sp
+ addi sp, sp, -8
+
+#if CHIP_HAS_CBOX_HOME_MAP()
+ /*
+ * On TILEPro, we need to flush all tiles' caches, since we may
+ * have been doing hash-for-home caching there. Note that we
+ * must do this _after_ we're completely done modifying any memory
+ * other than our output buffer (which we know is locally cached).
+ * We want the caches to be fully clean when we do the reexec,
+ * because the hypervisor is going to do this flush again at that
+ * point, and we don't want that second flush to overwrite any memory.
+ */
+ {
+ move r0, zero /* cache_pa */
+ move r1, zero
+ }
+ {
+ auli r2, zero, ha16(HV_FLUSH_EVICT_L2) /* cache_control */
+ movei r3, -1 /* cache_cpumask; -1 means all client tiles */
+ }
+ {
+ move r4, zero /* tlb_va */
+ move r5, zero /* tlb_length */
+ }
+ {
+ move r6, zero /* tlb_pgsize */
+ move r7, zero /* tlb_cpumask */
+ }
+ {
+ move r8, zero /* asids */
+ moveli r20, lo16(___hv_flush_remote)
+ }
+ {
+ move r9, zero /* asidcount */
+ auli r20, r20, ha16(___hv_flush_remote)
+ }
+
+ jalr r20
+#endif
+
+ /* r33 is destination pointer, default to zero */
+
+ moveli r33, 0
+
+.Lloop: lw r10, r30
+
+ andi r9, r10, 0xf /* low 4 bits tell us what type it is */
+ xor r10, r10, r9 /* r10 is now value with low 4 bits stripped */
+
+ seqi r0, r9, 0x1 /* IND_DESTINATION */
+ bzt r0, .Ltry2
+
+ move r33, r10
+
+#ifdef RELOCATE_NEW_KERNEL_VERBOSE
+ moveli r0, 'd'
+ jalr r40
+#endif
+
+ addi r30, r30, 4
+ j .Lloop
+
+.Ltry2:
+ seqi r0, r9, 0x2 /* IND_INDIRECTION */
+ bzt r0, .Ltry4
+
+ move r30, r10
+
+#ifdef RELOCATE_NEW_KERNEL_VERBOSE
+ moveli r0, 'i'
+ jalr r40
+#endif
+
+ j .Lloop
+
+.Ltry4:
+ seqi r0, r9, 0x4 /* IND_DONE */
+ bzt r0, .Ltry8
+
+ mf
+
+#ifdef RELOCATE_NEW_KERNEL_VERBOSE
+ moveli r0, 'D'
+ jalr r40
+ moveli r0, '\n'
+ jalr r40
+#endif
+
+ move r0, r32
+ moveli r1, 0 /* arg to hv_reexec is 64 bits */
+
+ moveli r41, lo16(___hv_reexec)
+ auli r41, r41, ha16(___hv_reexec)
+
+ jalr r41
+
+ /* we should not get here */
+
+ moveli r0, '?'
+ jalr r40
+ moveli r0, '\n'
+ jalr r40
+
+ j .Lhalt
+
+.Ltry8: seqi r0, r9, 0x8 /* IND_SOURCE */
+ bz r0, .Lerr /* unknown type */
+
+ /* copy page at r10 to page at r33 */
+
+ move r11, r33
+
+ moveli r0, lo16(PAGE_SIZE)
+ auli r0, r0, ha16(PAGE_SIZE)
+ add r33, r33, r0
+
+ /* copy word at r10 to word at r11 until r11 equals r33 */
+
+ /* We know page size must be multiple of 16, so we can unroll
+ * 16 times safely without any edge case checking.
+ *
+ * Issue a flush of the destination every 16 words to avoid
+ * incoherence when starting the new kernel. (Now this is
+ * just good paranoia because the hv_reexec call will also
+ * take care of this.)
+ */
+
+1:
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0; addi r11, r11, 4 }
+ { lw r0, r10; addi r10, r10, 4 }
+ { sw r11, r0 }
+ { flush r11 ; addi r11, r11, 4 }
+
+ seq r0, r33, r11
+ bzt r0, 1b
+
+#ifdef RELOCATE_NEW_KERNEL_VERBOSE
+ moveli r0, 's'
+ jalr r40
+#endif
+
+ addi r30, r30, 4
+ j .Lloop
+
+
+.Lerr: moveli r0, 'e'
+ jalr r40
+ moveli r0, 'r'
+ jalr r40
+ moveli r0, 'r'
+ jalr r40
+ moveli r0, '\n'
+ jalr r40
+.Lhalt:
+ moveli r41, lo16(___hv_halt)
+ auli r41, r41, ha16(___hv_halt)
+
+ jalr r41
+ STD_ENDPROC(relocate_new_kernel)
+
+ .section .rodata,"a"
+
+ .globl relocate_new_kernel_size
+relocate_new_kernel_size:
+ .long .Lend_relocate_new_kernel - relocate_new_kernel
diff --git a/arch/tile/kernel/relocate_kernel_64.S b/arch/tile/kernel/relocate_kernel_64.S
new file mode 100644
index 0000000..1c09a4f
--- /dev/null
+++ b/arch/tile/kernel/relocate_kernel_64.S
@@ -0,0 +1,260 @@
+/*
+ * Copyright 2011 Tilera Corporation. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ *
+ * copy new kernel into place and then call hv_reexec
+ *
+ */
+
+#include <linux/linkage.h>
+#include <arch/chip.h>
+#include <asm/page.h>
+#include <hv/hypervisor.h>
+
+#undef RELOCATE_NEW_KERNEL_VERBOSE
+
+STD_ENTRY(relocate_new_kernel)
+
+ move r30, r0 /* page list */
+ move r31, r1 /* address of page we are on */
+ move r32, r2 /* start address of new kernel */
+
+ shrui r1, r1, PAGE_SHIFT
+ addi r1, r1, 1
+ shli sp, r1, PAGE_SHIFT
+ addi sp, sp, -8
+ /* we now have a stack (whether we need one or not) */
+
+ moveli r40, hw2_last(hv_console_putc)
+ shl16insli r40, r40, hw1(hv_console_putc)
+ shl16insli r40, r40, hw0(hv_console_putc)
+
+#ifdef RELOCATE_NEW_KERNEL_VERBOSE
+ moveli r0, 'r'
+ jalr r40
+
+ moveli r0, '_'
+ jalr r40
+
+ moveli r0, 'n'
+ jalr r40
+
+ moveli r0, '_'
+ jalr r40
+
+ moveli r0, 'k'
+ jalr r40
+
+ moveli r0, '\n'
+ jalr r40
+#endif
+
+ /*
+ * Throughout this code r30 is pointer to the element of page
+ * list we are working on.
+ *
+ * Normally we get to the next element of the page list by
+ * incrementing r30 by eight. The exception is if the element
+ * on the page list is an IND_INDIRECTION in which case we use
+ * the element with the low bits masked off as the new value
+ * of r30.
+ *
+ * To get this started, we need the value passed to us (which
+ * will always be an IND_INDIRECTION) in memory somewhere with
+ * r30 pointing at it. To do that, we push the value passed
+ * to us on the stack and make r30 point to it.
+ */
+
+ st sp, r30
+ move r30, sp
+ addi sp, sp, -16
+
+#if CHIP_HAS_CBOX_HOME_MAP()
+ /*
+ * On TILE-GX, we need to flush all tiles' caches, since we may
+ * have been doing hash-for-home caching there. Note that we
+ * must do this _after_ we're completely done modifying any memory
+ * other than our output buffer (which we know is locally cached).
+ * We want the caches to be fully clean when we do the reexec,
+ * because the hypervisor is going to do this flush again at that
+ * point, and we don't want that second flush to overwrite any memory.
+ */
+ {
+ move r0, zero /* cache_pa */
+ moveli r1, hw2_last(HV_FLUSH_EVICT_L2)
+ }
+ {
+ shl16insli r1, r1, hw1(HV_FLUSH_EVICT_L2)
+ movei r2, -1 /* cache_cpumask; -1 means all client tiles */
+ }
+ {
+ shl16insli r1, r1, hw0(HV_FLUSH_EVICT_L2) /* cache_control */
+ move r3, zero /* tlb_va */
+ }
+ {
+ move r4, zero /* tlb_length */
+ move r5, zero /* tlb_pgsize */
+ }
+ {
+ move r6, zero /* tlb_cpumask */
+ move r7, zero /* asids */
+ }
+ {
+ moveli r20, hw2_last(hv_flush_remote)
+ move r8, zero /* asidcount */
+ }
+ shl16insli r20, r20, hw1(hv_flush_remote)
+ shl16insli r20, r20, hw0(hv_flush_remote)
+
+ jalr r20
+#endif
+
+ /* r33 is destination pointer, default to zero */
+
+ moveli r33, 0
+
+.Lloop: ld r10, r30
+
+ andi r9, r10, 0xf /* low 4 bits tell us what type it is */
+ xor r10, r10, r9 /* r10 is now value with low 4 bits stripped */
+
+ cmpeqi r0, r9, 0x1 /* IND_DESTINATION */
+ beqzt r0, .Ltry2
+
+ move r33, r10
+
+#ifdef RELOCATE_NEW_KERNEL_VERBOSE
+ moveli r0, 'd'
+ jalr r40
+#endif
+
+ addi r30, r30, 8
+ j .Lloop
+
+.Ltry2:
+ cmpeqi r0, r9, 0x2 /* IND_INDIRECTION */
+ beqzt r0, .Ltry4
+
+ move r30, r10
+
+#ifdef RELOCATE_NEW_KERNEL_VERBOSE
+ moveli r0, 'i'
+ jalr r40
+#endif
+
+ j .Lloop
+
+.Ltry4:
+ cmpeqi r0, r9, 0x4 /* IND_DONE */
+ beqzt r0, .Ltry8
+
+ mf
+
+#ifdef RELOCATE_NEW_KERNEL_VERBOSE
+ moveli r0, 'D'
+ jalr r40
+ moveli r0, '\n'
+ jalr r40
+#endif
+
+ move r0, r32
+
+ moveli r41, hw2_last(hv_reexec)
+ shl16insli r41, r41, hw1(hv_reexec)
+ shl16insli r41, r41, hw0(hv_reexec)
+
+ jalr r41
+
+ /* we should not get here */
+
+ moveli r0, '?'
+ jalr r40
+ moveli r0, '\n'
+ jalr r40
+
+ j .Lhalt
+
+.Ltry8: cmpeqi r0, r9, 0x8 /* IND_SOURCE */
+ beqz r0, .Lerr /* unknown type */
+
+ /* copy page at r10 to page at r33 */
+
+ move r11, r33
+
+ moveli r0, hw2_last(PAGE_SIZE)
+ shl16insli r0, r0, hw1(PAGE_SIZE)
+ shl16insli r0, r0, hw0(PAGE_SIZE)
+ add r33, r33, r0
+
+ /* copy word at r10 to word at r11 until r11 equals r33 */
+
+ /* We know page size must be multiple of 8, so we can unroll
+ * 8 times safely without any edge case checking.
+ *
+ * Issue a flush of the destination every 8 words to avoid
+ * incoherence when starting the new kernel. (Now this is
+ * just good paranoia because the hv_reexec call will also
+ * take care of this.)
+ */
+
+1:
+ { ld r0, r10; addi r10, r10, 8 }
+ { st r11, r0; addi r11, r11, 8 }
+ { ld r0, r10; addi r10, r10, 8 }
+ { st r11, r0; addi r11, r11, 8 }
+ { ld r0, r10; addi r10, r10, 8 }
+ { st r11, r0; addi r11, r11, 8 }
+ { ld r0, r10; addi r10, r10, 8 }
+ { st r11, r0; addi r11, r11, 8 }
+ { ld r0, r10; addi r10, r10, 8 }
+ { st r11, r0; addi r11, r11, 8 }
+ { ld r0, r10; addi r10, r10, 8 }
+ { st r11, r0; addi r11, r11, 8 }
+ { ld r0, r10; addi r10, r10, 8 }
+ { st r11, r0; addi r11, r11, 8 }
+ { ld r0, r10; addi r10, r10, 8 }
+ { st r11, r0 }
+ { flush r11 ; addi r11, r11, 8 }
+
+ cmpeq r0, r33, r11
+ beqzt r0, 1b
+
+#ifdef RELOCATE_NEW_KERNEL_VERBOSE
+ moveli r0, 's'
+ jalr r40
+#endif
+
+ addi r30, r30, 8
+ j .Lloop
+
+
+.Lerr: moveli r0, 'e'
+ jalr r40
+ moveli r0, 'r'
+ jalr r40
+ moveli r0, 'r'
+ jalr r40
+ moveli r0, '\n'
+ jalr r40
+.Lhalt:
+ moveli r41, hw2_last(hv_halt)
+ shl16insli r41, r41, hw1(hv_halt)
+ shl16insli r41, r41, hw0(hv_halt)
+
+ jalr r41
+ STD_ENDPROC(relocate_new_kernel)
+
+ .section .rodata,"a"
+
+ .globl relocate_new_kernel_size
+relocate_new_kernel_size:
+ .long .Lend_relocate_new_kernel - relocate_new_kernel
--
1.6.5.2
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/