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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>
- #include <asm/msr.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
- #if REQUIRED_MASK1 & NEED_CMPXCHG64
- /* Some VIA C3s need magic MSRs to enable CX64. Do this here */
- cmpl $0x746e6543,%ebx # Cent
- jne 1f
- cmpl $0x48727561,%edx # aurH
- jne 1f
- cmpl $0x736c7561,%ecx # auls
- jne 1f
- movl $1,%eax # check model
- cpuid
- movl %eax,%ebx
- shr $8,%ebx
- andl $0xf,%ebx
- cmp $6,%ebx # check family == 6
- jne 1f
- shr $4,%eax
- andl $0xf,%eax
- cmpl $6,%eax # check model >= 6
- jb 1f
- # assume models >= 6 all support this MSR
- movl $MSR_VIA_FCR,%ecx
- rdmsr
- orl $((1<<1)|(1<<7)),%eax # enable CMPXCHG64 and PGE
- wrmsr
- 1:
- #endif
- 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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