[PATCH 18/23] x86, realmode: don't copy real_mode_header

From: Jarkko Sakkinen
Date: Tue May 08 2012 - 14:24:18 EST

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Replaced copying of real_mode_header with a pointer
to beginning of RM memory.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxx>
---
arch/x86/include/asm/realmode.h | 5 ++-
arch/x86/kernel/acpi/sleep.c | 2 +-
arch/x86/kernel/realmode.c | 57 +++++++++++++++--------------------
arch/x86/kernel/reboot.c | 2 +-
arch/x86/kernel/smpboot.c | 4 +--
arch/x86/kernel/tboot.c | 2 +-
arch/x86/realmode/rm/header.S | 1 -
arch/x86/realmode/rm/realmode.lds.S | 1 -
arch/x86/realmode/rmpiggy.S | 2 ++
drivers/acpi/sleep.c | 2 +-
10 files changed, 35 insertions(+), 43 deletions(-)

diff --git a/arch/x86/include/asm/realmode.h b/arch/x86/include/asm/realmode.h
index 1bfc74d..d3ae49f 100644
--- a/arch/x86/include/asm/realmode.h
+++ b/arch/x86/include/asm/realmode.h
@@ -8,7 +8,6 @@
struct real_mode_header {
u32 text_start;
u32 ro_end;
- u32 end;
/* reboot */
#ifdef CONFIG_X86_32
u32 machine_real_restart_asm;
@@ -30,8 +29,8 @@ struct real_mode_header {
#endif
} __attribute__((__packed__));

-extern struct real_mode_header real_mode_header;
-extern unsigned char *real_mode_base;
+extern struct real_mode_header *real_mode_header;
+extern unsigned char real_mode_blob_end[];

extern unsigned long init_rsp;
extern unsigned long initial_code;
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 9ad1b79..5250475 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -34,7 +34,7 @@ static char temp_stack[4096];
int acpi_suspend_lowlevel(void)
{
struct wakeup_header *header =
- (struct wakeup_header *) __va(real_mode_header.wakeup_header);
+ (struct wakeup_header *) __va(real_mode_header->wakeup_header);

if (header->signature != WAKEUP_HEADER_SIGNATURE) {
printk(KERN_ERR "wakeup header does not match\n");
diff --git a/arch/x86/kernel/realmode.c b/arch/x86/kernel/realmode.c
index e7bf82a..632c810 100644
--- a/arch/x86/kernel/realmode.c
+++ b/arch/x86/kernel/realmode.c
@@ -5,8 +5,7 @@
#include <asm/pgtable.h>
#include <asm/realmode.h>

-unsigned char *real_mode_base;
-struct real_mode_header real_mode_header;
+struct real_mode_header *real_mode_header;

void __init setup_real_mode(void)
{
@@ -17,33 +16,32 @@ void __init setup_real_mode(void)
u32 *ptr;
u16 *seg;
int i;
+ unsigned char *base;

- struct real_mode_header *header =
- (struct real_mode_header *) real_mode_blob;
-
- size_t size = PAGE_ALIGN(header->end);
+ size_t size = PAGE_ALIGN(real_mode_blob_end - real_mode_blob);

/* Has to be in very low memory so we can execute real-mode AP code. */
mem = memblock_find_in_range(0, 1<<20, size, PAGE_SIZE);
if (!mem)
panic("Cannot allocate trampoline\n");

- real_mode_base = __va(mem);
+ base = __va(mem);
memblock_reserve(mem, size);
+ real_mode_header = (struct real_mode_header *) base;

printk(KERN_DEBUG "Base memory trampoline at [%p] %llx size %zu\n",
- real_mode_base, (unsigned long long)mem, size);
+ base, (unsigned long long)mem, size);

- memcpy(real_mode_base, real_mode_blob, size);
+ memcpy(base, real_mode_blob, size);

- real_mode_seg = __pa(real_mode_base) >> 4;
+ real_mode_seg = __pa(base) >> 4;
rel = (u32 *) real_mode_relocs;

/* 16-bit segment relocations. */
count = rel[0];
rel = &rel[1];
for (i = 0; i < count; i++) {
- seg = (u16 *) (real_mode_base + rel[i]);
+ seg = (u16 *) (base + rel[i]);
*seg = real_mode_seg;
}

@@ -51,25 +49,21 @@ void __init setup_real_mode(void)
count = rel[i];
rel = &rel[i + 1];
for (i = 0; i < count; i++) {
- ptr = (u32 *) (real_mode_base + rel[i]);
- *ptr += __pa(real_mode_base);
+ ptr = (u32 *) (base + rel[i]);
+ *ptr += __pa(base);
}

- /* Copied header will contain relocated physical addresses. */
- memcpy(&real_mode_header, real_mode_base,
- sizeof(struct real_mode_header));
-
#ifdef CONFIG_X86_32
- *((u32 *)__va(real_mode_header.startup_32_smp)) = __pa(startup_32_smp);
- *((u32 *)__va(real_mode_header.boot_gdt)) = __pa(boot_gdt);
+ *((u32 *)__va(real_mode_header->startup_32_smp)) = __pa(startup_32_smp);
+ *((u32 *)__va(real_mode_header->boot_gdt)) = __pa(boot_gdt);
#else
- *((u64 *) __va(real_mode_header.startup_64_smp)) =
+ *((u64 *) __va(real_mode_header->startup_64_smp)) =
(u64)secondary_startup_64;

- *((u64 *) __va(real_mode_header.level3_ident_pgt)) =
+ *((u64 *) __va(real_mode_header->level3_ident_pgt)) =
__pa(level3_ident_pgt) + _KERNPG_TABLE;

- *((u64 *) __va(real_mode_header.level3_kernel_pgt)) =
+ *((u64 *) __va(real_mode_header->level3_kernel_pgt)) =
__pa(level3_kernel_pgt) + _KERNPG_TABLE;
#endif
}
@@ -82,23 +76,22 @@ void __init setup_real_mode(void)
*/
static int __init set_real_mode_permissions(void)
{
- size_t all_size =
- PAGE_ALIGN(real_mode_header.end) -
- __pa(real_mode_base);
+ unsigned char *base = (unsigned char *) real_mode_header;
+ size_t size = PAGE_ALIGN(real_mode_blob_end - real_mode_blob);

size_t ro_size =
- PAGE_ALIGN(real_mode_header.ro_end) -
- __pa(real_mode_base);
+ PAGE_ALIGN(real_mode_header->ro_end) -
+ __pa(base);

size_t text_size =
- PAGE_ALIGN(real_mode_header.ro_end) -
- real_mode_header.text_start;
+ PAGE_ALIGN(real_mode_header->ro_end) -
+ real_mode_header->text_start;

unsigned long text_start =
- (unsigned long) __va(real_mode_header.text_start);
+ (unsigned long) __va(real_mode_header->text_start);

- set_memory_nx((unsigned long) real_mode_base, all_size >> PAGE_SHIFT);
- set_memory_ro((unsigned long) real_mode_base, ro_size >> PAGE_SHIFT);
+ set_memory_nx((unsigned long) base, size >> PAGE_SHIFT);
+ set_memory_ro((unsigned long) base, ro_size >> PAGE_SHIFT);
set_memory_x((unsigned long) text_start, text_size >> PAGE_SHIFT);

return 0;
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 050eff2..658f856 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -336,7 +336,7 @@ core_initcall(reboot_init);
void machine_real_restart(unsigned int type)
{
void (*restart_lowmem)(unsigned int) = (void (*)(unsigned int))
- real_mode_header.machine_real_restart_asm;
+ real_mode_header->machine_real_restart_asm;

local_irq_disable();

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index c7971ea..b8c0661 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -665,9 +665,9 @@ static void __cpuinit announce_cpu(int cpu, int apicid)
static int __cpuinit do_boot_cpu(int apicid, int cpu)
{
volatile u32 *trampoline_status =
- (volatile u32 *) __va(real_mode_header.trampoline_status);
+ (volatile u32 *) __va(real_mode_header->trampoline_status);
/* start_ip had better be page-aligned! */
- unsigned long start_ip = real_mode_header.trampoline_data;
+ unsigned long start_ip = real_mode_header->trampoline_data;

unsigned long boot_error = 0;
int timeout;
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index c136e23..65adda4 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -202,7 +202,7 @@ static int tboot_setup_sleep(void)
}

tboot->acpi_sinfo.kernel_s3_resume_vector =
- real_mode_header.wakeup_start;
+ real_mode_header->wakeup_start;

return 0;
}
diff --git a/arch/x86/realmode/rm/header.S b/arch/x86/realmode/rm/header.S
index a91ec8f..c83005c 100644
--- a/arch/x86/realmode/rm/header.S
+++ b/arch/x86/realmode/rm/header.S
@@ -12,7 +12,6 @@
GLOBAL(real_mode_header)
.long pa_text_start
.long pa_ro_end
- .long pa_end
#ifdef CONFIG_X86_32
.long pa_machine_real_restart_asm
#endif
diff --git a/arch/x86/realmode/rm/realmode.lds.S b/arch/x86/realmode/rm/realmode.lds.S
index 4d4afca..86b2e8d 100644
--- a/arch/x86/realmode/rm/realmode.lds.S
+++ b/arch/x86/realmode/rm/realmode.lds.S
@@ -65,7 +65,6 @@ SECTIONS
.signature : {
*(.signature)
}
- pa_end = .;

/DISCARD/ : {
*(.note*)
diff --git a/arch/x86/realmode/rmpiggy.S b/arch/x86/realmode/rmpiggy.S
index fd72a99..204c6ec 100644
--- a/arch/x86/realmode/rmpiggy.S
+++ b/arch/x86/realmode/rmpiggy.S
@@ -13,6 +13,8 @@ GLOBAL(real_mode_blob)
.incbin "arch/x86/realmode/rm/realmode.bin"
END(real_mode_blob)

+GLOBAL(real_mode_blob_end);
+
GLOBAL(real_mode_relocs)
.incbin "arch/x86/realmode/rm/realmode.relocs"
END(real_mode_relocs)
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 83869ab..25f554c 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -83,7 +83,7 @@ static struct notifier_block tts_notifier = {
static int acpi_sleep_prepare(u32 acpi_state)
{
#ifdef CONFIG_ACPI_SLEEP
- unsigned long wakeup_pa = real_mode_header.wakeup_start;
+ unsigned long wakeup_pa = real_mode_header->wakeup_start;
/* do we have a wakeup address for S2 and S3? */
if (acpi_state == ACPI_STATE_S3) {
if (!wakeup_pa)
--
1.7.9.5

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Next message: Jarkko Sakkinen: "[PATCH 22/23] x86, realmode: fixes compilation issue in tboot.c"
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