diff options
Diffstat (limited to 'arch/x86_64/kernel/acpi/wakeup.S')
| -rw-r--r-- | arch/x86_64/kernel/acpi/wakeup.S | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/arch/x86_64/kernel/acpi/wakeup.S b/arch/x86_64/kernel/acpi/wakeup.S index 766cfbcac1d..8550a6ffa27 100644 --- a/arch/x86_64/kernel/acpi/wakeup.S +++ b/arch/x86_64/kernel/acpi/wakeup.S @@ -43,6 +43,11 @@ wakeup_code: cmpl $0x12345678, %eax jne bogus_real_magic + call verify_cpu # Verify the cpu supports long + # mode + testl %eax, %eax + jnz no_longmode + testl $1, video_flags - wakeup_code jz 1f lcall $0xc000,$3 @@ -92,18 +97,6 @@ wakeup_32: # Running in this code, but at low address; paging is not yet turned on. movb $0xa5, %al ; outb %al, $0x80 - /* Check if extended functions are implemented */ - movl $0x80000000, %eax - cpuid - cmpl $0x80000000, %eax - jbe bogus_cpu - wbinvd - mov $0x80000001, %eax - cpuid - btl $29, %edx - jnc bogus_cpu - movl %edx,%edi - movl $__KERNEL_DS, %eax movl %eax, %ds @@ -123,6 +116,11 @@ wakeup_32: leal (wakeup_level4_pgt - wakeup_code)(%esi), %eax movl %eax, %cr3 + /* Check if nx is implemented */ + movl $0x80000001, %eax + cpuid + movl %edx,%edi + /* Enable Long Mode */ xorl %eax, %eax btsl $_EFER_LME, %eax @@ -244,10 +242,12 @@ bogus_64_magic: movb $0xb3,%al ; outb %al,$0x80 jmp bogus_64_magic -bogus_cpu: - movb $0xbc,%al ; outb %al,$0x80 - jmp bogus_cpu +.code16 +no_longmode: + movb $0xbc,%al ; outb %al,$0x80 + jmp no_longmode +#include "../verify_cpu.S" /* This code uses an extended set of video mode numbers. These include: * Aliases for standard modes |