diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/kernel/verify_cpu.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/kernel/verify_cpu.S | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/ANDROID_3.4.5/arch/x86/kernel/verify_cpu.S b/ANDROID_3.4.5/arch/x86/kernel/verify_cpu.S deleted file mode 100644 index b9242bac..00000000 --- a/ANDROID_3.4.5/arch/x86/kernel/verify_cpu.S +++ /dev/null @@ -1,139 +0,0 @@ -/* - * - * 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 |