80d671aea7
- the prototype changes to _cpuid(u32_t *eax, u32_t *ebx, u32_t *ecx, u32_t *edx) - this makes possible to use all the features of the cpuid instruction as described in the Intel specs
41 lines
669 B
ArmAsm
41 lines
669 B
ArmAsm
! _cpuid() - interface to cpuid instruction
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.sect .text; .sect .rom; .sect .data; .sect .bss
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.sect .text
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! void _cpuid(u32_t *eax, u32_t *ebx, u32_t *ecx, u32_t *edx);
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.define __cpuid
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__cpuid:
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! save registers
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push ebp
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push ebx
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! set parameters to cpuid and execute cpuid
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mov ebp, 12(esp)
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mov eax, (ebp)
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mov ebp, 16(esp)
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mov ebx, (ebp)
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mov ebp, 20(esp)
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mov ecx, (ebp)
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mov ebp, 24(esp)
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mov edx, (ebp)
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.data1 0x0F, 0xA2 ! CPUID
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! store results in pointer arguments
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mov ebp, 12(esp)
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mov (ebp), eax
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mov ebp, 16(esp)
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mov (ebp), ebx
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mov ebp, 20(esp)
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mov (ebp), ecx
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mov ebp, 24(esp)
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mov (ebp), edx
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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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