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