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Subject[RFC] merge 32/64 bits realmode wakeup code
Hi,

this patch merge 32 and 64 realmode wakeup code :
- this mean less ifdef in code
- we could remove now unused field in wakeup_header (pmode_*)
- this allow to set the first 1 MB NX.

Do you think it is safe on all X86 32 bit machine ?

Matthieu


Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 3ed5ad9..3baa11c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -219,7 +219,7 @@ config X86_HT

config X86_TRAMPOLINE
def_bool y
- depends on SMP || (64BIT && ACPI_SLEEP)
+ depends on SMP || ACPI_SLEEP

config X86_32_LAZY_GS
def_bool y
diff --git a/arch/x86/kernel/acpi/realmode/wakeup.S b/arch/x86/kernel/acpi/realmode/wakeup.S
index 28595d6..2c2d5b8 100644
--- a/arch/x86/kernel/acpi/realmode/wakeup.S
+++ b/arch/x86/kernel/acpi/realmode/wakeup.S
@@ -90,36 +90,10 @@ _start:

/* Do any other stuff... */

-#ifndef CONFIG_64BIT
- /* This could also be done in C code... */
- movl pmode_cr3, %eax
- movl %eax, %cr3
-
- movl pmode_cr4, %ecx
- jecxz 1f
- movl %ecx, %cr4
-1:
- movl pmode_efer, %eax
- movl pmode_efer + 4, %edx
- movl %eax, %ecx
- orl %edx, %ecx
- jz 1f
- movl $MSR_EFER, %ecx
- wrmsr
-1:
-
- lgdtl pmode_gdt
-
- /* This really couldn't... */
- movl pmode_cr0, %eax
- movl %eax, %cr0
- jmp pmode_return
-#else
pushw $0
pushw trampoline_segment
pushw $0
lret
-#endif

bogus_real_magic:
1:
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 69fd72a..d32bef9 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -26,7 +26,7 @@ unsigned long acpi_realmode_flags;
/* address in low memory of the wakeup routine. */
static unsigned long acpi_realmode;

-#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
+#if defined(CONFIG_SMP)
static char temp_stack[4096];
#endif

@@ -80,31 +80,24 @@ int acpi_save_state_mem(void)
header->wakeup_gdt[2] =
GDT_ENTRY(0x8093, acpi_wakeup_address, 0xfffff);

-#ifndef CONFIG_64BIT
- store_gdt((struct desc_ptr *)&header->pmode_gdt);
-
- if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
- &header->pmode_efer_high))
- header->pmode_efer_low = header->pmode_efer_high = 0;
-#endif /* !CONFIG_64BIT */
-
header->pmode_cr0 = read_cr0();
header->pmode_cr4 = read_cr4_safe();
header->realmode_flags = acpi_realmode_flags;
header->real_magic = 0x12345678;
-
-#ifndef CONFIG_64BIT
- header->pmode_entry = (u32)&wakeup_pmode_return;
- header->pmode_cr3 = (u32)__pa(&initial_page_table);
- saved_magic = 0x12345678;
-#else /* CONFIG_64BIT */
header->trampoline_segment = setup_trampoline() >> 4;
#ifdef CONFIG_SMP
stack_start.sp = temp_stack + sizeof(temp_stack);
early_gdt_descr.address =
(unsigned long)get_cpu_gdt_table(smp_processor_id());
+#ifdef CONFIG_64BIT
initial_gs = per_cpu_offset(smp_processor_id());
#endif
+#endif
+
+#ifndef CONFIG_64BIT
+ initial_code = (unsigned long)&wakeup_pmode_return;
+ saved_magic = 0x12345678;
+#else
initial_code = (unsigned long)wakeup_long64;
saved_magic = 0x123456789abcdef0L;
#endif /* CONFIG_64BIT */
diff --git a/arch/x86/kernel/trampoline_32.S b/arch/x86/kernel/trampoline_32.S
index 8508237..11f0387 100644
--- a/arch/x86/kernel/trampoline_32.S
+++ b/arch/x86/kernel/trampoline_32.S
@@ -32,8 +32,12 @@
#include <asm/segment.h>
#include <asm/page_types.h>

-/* We can free up trampoline after bootup if cpu hotplug is not supported. */
+#ifdef CONFIG_ACPI_SLEEP
+.section .rodata, "a", @progbits
+#else
+/* We can free up the trampoline after bootup if cpu hotplug is not supported. */
__CPUINITRODATA
+#endif
.code16

ENTRY(trampoline_data)
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