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