878ba523ac
This library includes various random and minix-specific functions included in the Minix libc. Most of them should be part of libsys, and in general it would be nice to extinguish this library over time.
41 lines
737 B
ArmAsm
41 lines
737 B
ArmAsm
/* _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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