mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 17:51:43 +00:00
0d2eb44f63
They were generated by 'codespell' and then manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi> Cc: trivial@kernel.org LKML-Reference: <1300389856-1099-3-git-send-email-lucas.demarchi@profusion.mobi> Signed-off-by: Ingo Molnar <mingo@elte.hu>
140 lines
3.6 KiB
ArmAsm
140 lines
3.6 KiB
ArmAsm
/*
|
|
*
|
|
* verify_cpu.S - Code for cpu long mode and SSE verification. This
|
|
* code has been borrowed from boot/setup.S and was introduced by
|
|
* Andi Kleen.
|
|
*
|
|
* Copyright (c) 2007 Andi Kleen (ak@suse.de)
|
|
* Copyright (c) 2007 Eric Biederman (ebiederm@xmission.com)
|
|
* Copyright (c) 2007 Vivek Goyal (vgoyal@in.ibm.com)
|
|
* Copyright (c) 2010 Kees Cook (kees.cook@canonical.com)
|
|
*
|
|
* This source code is licensed under the GNU General Public License,
|
|
* Version 2. See the file COPYING for more details.
|
|
*
|
|
* This is a common code for verification whether CPU supports
|
|
* long mode and SSE or not. It is not called directly instead this
|
|
* file is included at various places and compiled in that context.
|
|
* This file is expected to run in 32bit code. Currently:
|
|
*
|
|
* arch/x86/boot/compressed/head_64.S: Boot cpu verification
|
|
* arch/x86/kernel/trampoline_64.S: secondary processor verification
|
|
* arch/x86/kernel/head_32.S: processor startup
|
|
*
|
|
* verify_cpu, returns the status of longmode and SSE in register %eax.
|
|
* 0: Success 1: Failure
|
|
*
|
|
* On Intel, the XD_DISABLE flag will be cleared as a side-effect.
|
|
*
|
|
* The caller needs to check for the error code and take the action
|
|
* appropriately. Either display a message or halt.
|
|
*/
|
|
|
|
#include <asm/cpufeature.h>
|
|
#include <asm/msr-index.h>
|
|
|
|
verify_cpu:
|
|
pushfl # Save caller passed flags
|
|
pushl $0 # Kill any dangerous flags
|
|
popfl
|
|
|
|
pushfl # standard way to check for cpuid
|
|
popl %eax
|
|
movl %eax,%ebx
|
|
xorl $0x200000,%eax
|
|
pushl %eax
|
|
popfl
|
|
pushfl
|
|
popl %eax
|
|
cmpl %eax,%ebx
|
|
jz verify_cpu_no_longmode # cpu has no cpuid
|
|
|
|
movl $0x0,%eax # See if cpuid 1 is implemented
|
|
cpuid
|
|
cmpl $0x1,%eax
|
|
jb verify_cpu_no_longmode # no cpuid 1
|
|
|
|
xor %di,%di
|
|
cmpl $0x68747541,%ebx # AuthenticAMD
|
|
jnz verify_cpu_noamd
|
|
cmpl $0x69746e65,%edx
|
|
jnz verify_cpu_noamd
|
|
cmpl $0x444d4163,%ecx
|
|
jnz verify_cpu_noamd
|
|
mov $1,%di # cpu is from AMD
|
|
jmp verify_cpu_check
|
|
|
|
verify_cpu_noamd:
|
|
cmpl $0x756e6547,%ebx # GenuineIntel?
|
|
jnz verify_cpu_check
|
|
cmpl $0x49656e69,%edx
|
|
jnz verify_cpu_check
|
|
cmpl $0x6c65746e,%ecx
|
|
jnz verify_cpu_check
|
|
|
|
# only call IA32_MISC_ENABLE when:
|
|
# family > 6 || (family == 6 && model >= 0xd)
|
|
movl $0x1, %eax # check CPU family and model
|
|
cpuid
|
|
movl %eax, %ecx
|
|
|
|
andl $0x0ff00f00, %eax # mask family and extended family
|
|
shrl $8, %eax
|
|
cmpl $6, %eax
|
|
ja verify_cpu_clear_xd # family > 6, ok
|
|
jb verify_cpu_check # family < 6, skip
|
|
|
|
andl $0x000f00f0, %ecx # mask model and extended model
|
|
shrl $4, %ecx
|
|
cmpl $0xd, %ecx
|
|
jb verify_cpu_check # family == 6, model < 0xd, skip
|
|
|
|
verify_cpu_clear_xd:
|
|
movl $MSR_IA32_MISC_ENABLE, %ecx
|
|
rdmsr
|
|
btrl $2, %edx # clear MSR_IA32_MISC_ENABLE_XD_DISABLE
|
|
jnc verify_cpu_check # only write MSR if bit was changed
|
|
wrmsr
|
|
|
|
verify_cpu_check:
|
|
movl $0x1,%eax # Does the cpu have what it takes
|
|
cpuid
|
|
andl $REQUIRED_MASK0,%edx
|
|
xorl $REQUIRED_MASK0,%edx
|
|
jnz verify_cpu_no_longmode
|
|
|
|
movl $0x80000000,%eax # See if extended cpuid is implemented
|
|
cpuid
|
|
cmpl $0x80000001,%eax
|
|
jb verify_cpu_no_longmode # no extended cpuid
|
|
|
|
movl $0x80000001,%eax # Does the cpu have what it takes
|
|
cpuid
|
|
andl $REQUIRED_MASK1,%edx
|
|
xorl $REQUIRED_MASK1,%edx
|
|
jnz verify_cpu_no_longmode
|
|
|
|
verify_cpu_sse_test:
|
|
movl $1,%eax
|
|
cpuid
|
|
andl $SSE_MASK,%edx
|
|
cmpl $SSE_MASK,%edx
|
|
je verify_cpu_sse_ok
|
|
test %di,%di
|
|
jz verify_cpu_no_longmode # only try to force SSE on AMD
|
|
movl $MSR_K7_HWCR,%ecx
|
|
rdmsr
|
|
btr $15,%eax # enable SSE
|
|
wrmsr
|
|
xor %di,%di # don't loop
|
|
jmp verify_cpu_sse_test # try again
|
|
|
|
verify_cpu_no_longmode:
|
|
popfl # Restore caller passed flags
|
|
movl $1,%eax
|
|
ret
|
|
verify_cpu_sse_ok:
|
|
popfl # Restore caller passed flags
|
|
xorl %eax, %eax
|
|
ret
|