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[PATCH] x86-64: Move cpu verification code to common file 

o This patch moves the code to verify long mode and SSE to a common file.
  This code is now shared by trampoline.S, wakeup.S, boot/setup.S and
  boot/compressed/head.S

o So far we used to do very limited check in trampoline.S, wakeup.S and
  in 32bit entry point. Now all the entry paths are forced to do the
  exhaustive check, including SSE because verify_cpu is shared.

o I am keeping this patch as last in the x86 relocatable series because
  previous patches have got quite some amount of testing done and don't want
  to distrub that. So that if there is problem introduced by this patch, at
  least it can be easily isolated.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Vivek Goyal 2007-05-02 19:27:08 +02:00 committed by Andi Kleen
parent 8035d3ea78
commit a4831e08b7
5 changed files with 151 additions and 122 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
arch/x86_64/boot/compressed/head.S
View File

@ -54,6 +54,15 @@ startup_32:
1: popl %ebp
subl $1b, %ebp
/* setup a stack and make sure cpu supports long mode. */
movl $user_stack_end, %eax
addl %ebp, %eax
movl %eax, %esp
call verify_cpu
testl %eax, %eax
jnz no_longmode
/* Compute the delta between where we were compiled to run at
* and where the code will actually run at.
*/
@ -159,13 +168,21 @@ startup_32:
/* Jump from 32bit compatibility mode into 64bit mode. */
lret
no_longmode:
/* This isn't an x86-64 CPU so hang */
1:
hlt
jmp 1b
#include "../../kernel/verify_cpu.S"
/* Be careful here startup_64 needs to be at a predictable
* address so I can export it in an ELF header. Bootloaders
* should look at the ELF header to find this address, as
* it may change in the future.
*/
.code64
.org 0x100
.org 0x200
ENTRY(startup_64)
/* We come here either from startup_32 or directly from a
* 64bit bootloader. If we come here from a bootloader we depend on

63
arch/x86_64/boot/setup.S
View File

@ -299,64 +299,10 @@ loader_ok:
movw %cs,%ax
movw %ax,%ds
/* minimum CPUID flags for x86-64 */
/* see http://www.x86-64.org/lists/discuss/msg02971.html */
#define SSE_MASK ((1<<25)|(1<<26))
#define REQUIRED_MASK1 ((1<<0)|(1<<3)|(1<<4)|(1<<5)|(1<<6)|(1<<8)|\
(1<<13)|(1<<15)|(1<<24))
#define REQUIRED_MASK2 (1<<29)
call verify_cpu
testl %eax,%eax
jz sse_ok
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 no_longmode /* cpu has no cpuid */
movl $0x0,%eax
cpuid
cmpl $0x1,%eax
jb no_longmode /* no cpuid 1 */
xor %di,%di
cmpl $0x68747541,%ebx /* AuthenticAMD */
jnz noamd
cmpl $0x69746e65,%edx
jnz noamd
cmpl $0x444d4163,%ecx
jnz noamd
mov $1,%di /* cpu is from AMD */
noamd:
movl $0x1,%eax
cpuid
andl $REQUIRED_MASK1,%edx
xorl $REQUIRED_MASK1,%edx
jnz no_longmode
movl $0x80000000,%eax
cpuid
cmpl $0x80000001,%eax
jb no_longmode /* no extended cpuid */
movl $0x80000001,%eax
cpuid
andl $REQUIRED_MASK2,%edx
xorl $REQUIRED_MASK2,%edx
jnz no_longmode
sse_test:
movl $1,%eax
cpuid
andl $SSE_MASK,%edx
cmpl $SSE_MASK,%edx
je sse_ok
test %di,%di
jz no_longmode /* only try to force SSE on AMD */
movl $0xc0010015,%ecx /* HWCR */
rdmsr
btr $15,%eax /* enable SSE */
wrmsr
xor %di,%di /* don't loop */
jmp sse_test /* try again */
no_longmode:
call beep
lea long_mode_panic,%si
@ -366,7 +312,8 @@ no_longmode_loop:
long_mode_panic:
.string "Your CPU does not support long mode. Use a 32bit distribution."
.byte 0
#include "../kernel/verify_cpu.S"
sse_ok:
popw %ds

30
arch/x86_64/kernel/acpi/wakeup.S
View File

@ -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

51
arch/x86_64/kernel/trampoline.S
View File

@ -54,6 +54,8 @@ r_base = .
movw $(trampoline_stack_end - r_base), %sp
call verify_cpu # Verify the cpu supports long mode
testl %eax, %eax # Check for return code
jnz no_longmode
mov %cs, %ax
movzx %ax, %esi # Find the 32bit trampoline location
@ -121,57 +123,10 @@ startup_64:
jmp *%rax
.code16
verify_cpu:
pushl $0 # Kill any dangerous flags
popfl
/* minimum CPUID flags for x86-64 */
/* see http://www.x86-64.org/lists/discuss/msg02971.html */
#define REQUIRED_MASK1 ((1<<0)|(1<<3)|(1<<4)|(1<<5)|(1<<6)|(1<<8)|\
(1<<13)|(1<<15)|(1<<24)|(1<<25)|(1<<26))
#define REQUIRED_MASK2 (1<<29)
pushfl # check for cpuid
popl %eax
movl %eax, %ebx
xorl $0x200000,%eax
pushl %eax
popfl
pushfl
popl %eax
pushl %ebx
popfl
cmpl %eax, %ebx
jz no_longmode
xorl %eax, %eax # See if cpuid 1 is implemented
cpuid
cmpl $0x1, %eax
jb no_longmode
movl $0x01, %eax # Does the cpu have what it takes?
cpuid
andl $REQUIRED_MASK1, %edx
xorl $REQUIRED_MASK1, %edx
jnz no_longmode
movl $0x80000000, %eax # See if extended cpuid is implemented
cpuid
cmpl $0x80000001, %eax
jb no_longmode
movl $0x80000001, %eax # Does the cpu have what it takes?
cpuid
andl $REQUIRED_MASK2, %edx
xorl $REQUIRED_MASK2, %edx
jnz no_longmode
ret # The cpu supports long mode
no_longmode:
hlt
jmp no_longmode
#include "verify_cpu.S"
# Careful these need to be in the same 64K segment as the above;
tidt:

110
arch/x86_64/kernel/verify_cpu.S Normal file
View File

@ -0,0 +1,110 @@
/*
*
* 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.
*/
verify_cpu:
pushfl # Save caller passed flags
pushl $0 # Kill any dangerous flags
popfl
/* minimum CPUID flags for x86-64 */
/* see http://www.x86-64.org/lists/discuss/msg02971.html */
#define SSE_MASK ((1<<25)|(1<<26))
#define REQUIRED_MASK1 ((1<<0)|(1<<3)|(1<<4)|(1<<5)|(1<<6)|(1<<8)|\
(1<<13)|(1<<15)|(1<<24))
#define REQUIRED_MASK2 (1<<29)
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_MASK1,%edx
xorl $REQUIRED_MASK1,%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_MASK2,%edx
xorl $REQUIRED_MASK2,%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 $0xc0010015,%ecx # HWCR
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