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x86: fix i486 suspend to disk CR4 oops 

arch/x86/power/cpu_32.c __save_processor_state calls read_cr4()
only a i486 CPU doesn't have the CR4 register.  Trying to read it
produces an invalid opcode oops during suspend to disk.

Use the safe rc4 reading op instead. If the value to be written is
zero the write is skipped.

arch/x86/power/hibernate_asm_32.S
done: swapped the use of %eax and %ecx to use jecxz for
the zero test and jump over store to %cr4.
restore_image: s/%ecx/%eax/ to be consistent with done:

In addition to __save_processor_state, acpi_save_state_mem,
efi_call_phys_prelog, and efi_call_phys_epilog had checks added
(acpi restore was in assembly and already had a check for
non-zero).  There were other reads and writes of CR4, but MCE and
virtualization shouldn't be executed on a i486 anyway.

Signed-off-by: David Fries <david@fries.net>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
David Fries 2008-08-17 23:03:40 -05:00 committed by Ingo Molnar
parent 39e00fe20a
commit e532c06f2a
4 changed files with 22 additions and 16 deletions
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2
arch/x86/kernel/acpi/sleep.c
View File

@ -86,7 +86,7 @@ int acpi_save_state_mem(void)
#endif /* !CONFIG_64BIT */
header->pmode_cr0 = read_cr0();
header->pmode_cr4 = read_cr4();
header->pmode_cr4 = read_cr4_safe();
header->realmode_flags = acpi_realmode_flags;
header->real_magic = 0x12345678;

4
arch/x86/kernel/efi_32.c
View File

@ -53,7 +53,7 @@ void efi_call_phys_prelog(void)
* directory. If I have PAE, I just need to duplicate one entry in
* page directory.
*/
cr4 = read_cr4();
cr4 = read_cr4_safe();
if (cr4 & X86_CR4_PAE) {
efi_bak_pg_dir_pointer[0].pgd =
@ -91,7 +91,7 @@ void efi_call_phys_epilog(void)
gdt_descr.size = GDT_SIZE - 1;
load_gdt(&gdt_descr);
cr4 = read_cr4();
cr4 = read_cr4_safe();
if (cr4 & X86_CR4_PAE) {
swapper_pg_dir[pgd_index(0)].pgd =

6
arch/x86/power/cpu_32.c
View File

@ -45,7 +45,7 @@ static void __save_processor_state(struct saved_context *ctxt)
ctxt->cr0 = read_cr0();
ctxt->cr2 = read_cr2();
ctxt->cr3 = read_cr3();
ctxt->cr4 = read_cr4();
ctxt->cr4 = read_cr4_safe();
}
/* Needed by apm.c */
@ -98,7 +98,9 @@ static void __restore_processor_state(struct saved_context *ctxt)
/*
* control registers
*/
write_cr4(ctxt->cr4);
/* cr4 was introduced in the Pentium CPU */
if (ctxt->cr4)
write_cr4(ctxt->cr4);
write_cr3(ctxt->cr3);
write_cr2(ctxt->cr2);
write_cr0(ctxt->cr0);

26
arch/x86/power/hibernate_asm_32.S
View File

@ -28,9 +28,9 @@ ENTRY(swsusp_arch_suspend)
ret
ENTRY(restore_image)
movl resume_pg_dir, %ecx
subl $__PAGE_OFFSET, %ecx
movl %ecx, %cr3
movl resume_pg_dir, %eax
subl $__PAGE_OFFSET, %eax
movl %eax, %cr3
movl restore_pblist, %edx
.p2align 4,,7
@ -52,17 +52,21 @@ copy_loop:
done:
/* go back to the original page tables */
movl $swapper_pg_dir, %ecx
subl $__PAGE_OFFSET, %ecx
movl %ecx, %cr3
movl $swapper_pg_dir, %eax
subl $__PAGE_OFFSET, %eax
movl %eax, %cr3
/* Flush TLB, including "global" things (vmalloc) */
movl mmu_cr4_features, %eax
movl %eax, %edx
movl mmu_cr4_features, %ecx
jecxz 1f # cr4 Pentium and higher, skip if zero
movl %ecx, %edx
andl $~(1<<7), %edx; # PGE
movl %edx, %cr4; # turn off PGE
movl %cr3, %ecx; # flush TLB
movl %ecx, %cr3
movl %eax, %cr4; # turn PGE back on
1:
movl %cr3, %eax; # flush TLB
movl %eax, %cr3
jecxz 1f # cr4 Pentium and higher, skip if zero
movl %ecx, %cr4; # turn PGE back on
1:
movl saved_context_esp, %esp
movl saved_context_ebp, %ebp