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/* _cpuid() - interface to cpuid instruction */
/* void _cpuid(u32_t *eax, u32_t *ebx, u32_t *ecx, u32_t *edx); */
/* 0 for OK, nonzero for unsupported */
#include <machine/asm.h>
ENTRY(_cpuid)
/* save work registers */
push %ebp
push %ebx
/* set eax parameter to cpuid and execute cpuid */
movl 12(%esp), %ebp
mov (%ebp), %eax
movl 16(%esp), %ebp
mov (%ebp), %ebx
movl 20(%esp), %ebp
mov (%ebp), %ecx
movl 24(%esp), %ebp
mov (%ebp), %edx
.byte 0x0F, 0xA2 /* CPUID */
/* store results in pointer arguments */
movl 12(%esp), %ebp
movl %eax, (%ebp)
movl 16(%esp), %ebp
movl %ebx, (%ebp)
movl 20(%esp), %ebp
movl %ecx, (%ebp)
movl 24(%esp), %ebp
movl %edx, (%ebp)
/* restore registers */
pop %ebx
pop %ebp
ret
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