From c5cbac69422a9bffe7c7fd9a115130e272b547f5 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 10 Nov 2010 10:35:51 -0800 Subject: x86, cpu: Rename verify_cpu_64.S to verify_cpu.S The code is 32bit already, and can be used in 32bit routines. Signed-off-by: Kees Cook LKML-Reference: <1289414154-7829-2-git-send-email-kees.cook@canonical.com> Acked-by: Pekka Enberg Acked-by: Alan Cox Signed-off-by: H. Peter Anvin diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index 52f85a1..35af09d 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -182,7 +182,7 @@ no_longmode: hlt jmp 1b -#include "../../kernel/verify_cpu_64.S" +#include "../../kernel/verify_cpu.S" /* * Be careful here startup_64 needs to be at a predictable diff --git a/arch/x86/kernel/trampoline_64.S b/arch/x86/kernel/trampoline_64.S index 3af2dff..075d130 100644 --- a/arch/x86/kernel/trampoline_64.S +++ b/arch/x86/kernel/trampoline_64.S @@ -127,7 +127,7 @@ startup_64: no_longmode: hlt jmp no_longmode -#include "verify_cpu_64.S" +#include "verify_cpu.S" # Careful these need to be in the same 64K segment as the above; tidt: diff --git a/arch/x86/kernel/verify_cpu.S b/arch/x86/kernel/verify_cpu.S new file mode 100644 index 0000000..56a8c2a --- /dev/null +++ b/arch/x86/kernel/verify_cpu.S @@ -0,0 +1,106 @@ +/* + * + * 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) + * + * 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. + * Following are the current usage. + * + * This file is included by both 16bit and 32bit code. + * + * arch/x86_64/boot/setup.S : Boot cpu verification (16bit) + * arch/x86_64/boot/compressed/head.S: Boot cpu verification (32bit) + * arch/x86_64/kernel/trampoline.S: secondary processor verfication (16bit) + * arch/x86_64/kernel/acpi/wakeup.S:Verfication at resume (16bit) + * + * verify_cpu, returns the status of cpu check in register %eax. + * 0: Success 1: Failure + * + * The caller needs to check for the error code and take the action + * appropriately. Either display a message or halt. + */ + +#include +#include + +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 + +verify_cpu_noamd: + 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 diff --git a/arch/x86/kernel/verify_cpu_64.S b/arch/x86/kernel/verify_cpu_64.S deleted file mode 100644 index 56a8c2a..0000000 --- a/arch/x86/kernel/verify_cpu_64.S +++ /dev/null @@ -1,106 +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) - * - * 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. - * Following are the current usage. - * - * This file is included by both 16bit and 32bit code. - * - * arch/x86_64/boot/setup.S : Boot cpu verification (16bit) - * arch/x86_64/boot/compressed/head.S: Boot cpu verification (32bit) - * arch/x86_64/kernel/trampoline.S: secondary processor verfication (16bit) - * arch/x86_64/kernel/acpi/wakeup.S:Verfication at resume (16bit) - * - * verify_cpu, returns the status of cpu check in register %eax. - * 0: Success 1: Failure - * - * The caller needs to check for the error code and take the action - * appropriately. Either display a message or halt. - */ - -#include -#include - -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 - -verify_cpu_noamd: - 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 -- cgit v0.10.2