| /* 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 |