mirror of
https://gitlab.com/80486DX2-66/gists
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83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
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/*
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* cpuid_vendor_id.mod.c
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*
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* The file is a modified version of a gist "cpuid_vendor_id.c" by leiless:
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* https://gist.github.com/leiless/8b8603ae31c00fe38d2e97d94462a5a5
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* (revision 73830d4b10090dcf6748cc60a0aacee252cd9e9d2dd54549aa7b995321380091)
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*
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* The following license information applies for the modifications:
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* Author: Intel A80486DX2-66
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* License: Creative Commons Zero 1.0 Universal
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*/
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#if !(defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || \
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defined(__x86_64) || defined(_M_X64) || defined(_M_AMD64) || \
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defined(__i386) || defined(__i386__) || defined(__IA32__) || \
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defined(_M_I86) || defined(_M_IX86) || defined(__X86__) || defined(_X86_))
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# error "This code isn't supposed to work on non-x86 CPUs."
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#endif
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#include <stdio.h>
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#ifdef _WIN32
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#include <intrin.h> // __cpuid()
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#endif
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typedef unsigned int cpuid_t[4];
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#define EAX 0
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#define EBX 1
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#define ECX 2
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#define EDX 3
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// https://elixir.bootlin.com/linux/latest/source/arch/x86/include/asm/
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// processor.h#L216
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//
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// https://stackoverflow.com/questions/6491566/getting-the-machine-serial
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// -number-and-cpu-id-using-c-c-in-linux
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//
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// https://stackoverflow.com/questions/1666093/cpuid-implementations-in-c
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static inline void native_cpuid(unsigned int function_id, cpuid_t r) {
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#ifdef _WIN32
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__cpuid((int *) r, (int) function_id);
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#else
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r[EAX] = function_id;
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r[ECX] = 0;
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// NOTE:XXX: Register ECX is often an input as well as an output
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asm volatile("cpuid"
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: "=a" (r[EAX]),
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"=b" (r[EBX]),
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"=c" (r[ECX]),
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"=d" (r[EDX])
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: "0" (r[EAX]), "2" (r[ECX])
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: "memory");
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#endif
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}
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#define VENDOR_ID_LEN 13
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/*
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* FIXME: you have to make sure the vendor argument is at least lengthed
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* VENDOR_ID_LEN
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*/
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static inline void cpuid_vendor_id(char vendor[VENDOR_ID_LEN]) {
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// Always initialize the result in case of buggy CPU (like ES/QS CPUs)
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cpuid_t v;
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native_cpuid(0, v);
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// https://learn.microsoft.com/en-us/cpp/intrinsics/cpuid-cpuidex
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// ?view=msvc-170#example
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((unsigned int *) vendor)[0] = v[EBX];
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((unsigned int *) vendor)[1] = v[EDX];
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((unsigned int *) vendor)[2] = v[ECX];
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vendor[VENDOR_ID_LEN - 1] = '\0';
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}
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int main(void) {
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char vendor_string[VENDOR_ID_LEN];
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cpuid_vendor_id(vendor_string);
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printf("CPU Vendor ID: '%s'\n", vendor_string);
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return 0;
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}
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