fd0581bbb4
Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
68 lines
1.2 KiB
ArmAsm
68 lines
1.2 KiB
ArmAsm
/* Check if CPU has some minimum CPUID bits
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This runs in 16bit mode so that the caller can still use the BIOS
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to output errors on the screen */
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#include <asm/cpufeature.h>
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verify_cpu:
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pushfl # Save caller passed flags
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pushl $0 # Kill any dangerous flags
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popfl
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#if CONFIG_X86_MINIMUM_CPU_MODEL >= 4
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pushfl
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pop %eax
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orl $(1<<18),%eax # try setting AC
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push %eax
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popfl
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pushfl
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popl %eax
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testl $(1<<18),%eax
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jz bad
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#endif
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#if REQUIRED_MASK1 != 0
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pushfl # standard way to check for cpuid
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popl %eax
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movl %eax,%ebx
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xorl $0x200000,%eax
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pushl %eax
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popfl
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pushfl
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popl %eax
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cmpl %eax,%ebx
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pushfl # standard way to check for cpuid
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popl %eax
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movl %eax,%ebx
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xorl $0x200000,%eax
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pushl %eax
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popfl
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pushfl
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popl %eax
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cmpl %eax,%ebx
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jz bad # REQUIRED_MASK1 != 0 requires CPUID
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movl $0x0,%eax # See if cpuid 1 is implemented
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cpuid
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cmpl $0x1,%eax
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jb bad # no cpuid 1
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movl $0x1,%eax # Does the cpu have what it takes
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cpuid
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#if CONFIG_X86_MINIMUM_CPU_MODEL > 4
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#error add proper model checking here
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#endif
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andl $REQUIRED_MASK1,%edx
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xorl $REQUIRED_MASK1,%edx
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jnz bad
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#endif /* REQUIRED_MASK1 */
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popfl
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xor %eax,%eax
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ret
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bad:
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popfl
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movl $1,%eax
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ret
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