Mark
24 lines
568 B
C
24 lines
568 B
C
#include "arch/amd64/cpuid.h"
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#include "sys/panic.h"
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uint32_t cpuid_features_edx, cpuid_features_ecx;
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uint32_t cpuid_ext_features_edx, cpuid_ext_features_ecx;
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void cpuid_init(void) {
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uint32_t buf[4];
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cpuid(CPUID_REQ_FEATURES, buf);
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cpuid_features_ecx = buf[1];
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cpuid_features_edx = buf[2];
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cpuid(CPUID_REQ_EXT_FEATURES, buf);
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cpuid_ext_features_ecx = buf[1];
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cpuid_ext_features_edx = buf[2];
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if (!(cpuid_ext_features_edx & CPUID_EXT_EDX_FEATURE_SYSCALL)) {
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panic("Support for SYSCALL instruction is required\n");
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}
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}
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