[MODERN FEATURES] CPUID and MSR

kernel/include/cpuid.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#define CPUID_FUNCTION_VENDOR   0x00000000
+#define CPUID_FUNCTION_FEATURES 0x00000001
+#define CPUID_FUNCTION_TLB      0x00000003
+#define CPUID_FUNCTION_SERIAL   0x00000004
+
+#define CPUID_FUNCTIONX_VENDOR    0x80000000
+#define CPUID_FUNCTIONX_FEATURES  0x80000001
+#define CPUID_FUNCTIONX_BRAND0    0x80000002
+#define CPUID_FUNCTIONX_BRAND1    0x80000003
+#define CPUID_FUNCTIONX_BRAND2    0x80000004
+
+#define CPUID_FEATURE_MSR (cpuid_features_d & 1<<5)
+#define CPUID_FEATURE_APIC (cpuid_features_d & 1<<9)
+#define CPUID_FEATURE_SYSCALL (cpuid_featuresx_d & 1<<11)
+
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+
+void cpuid(uint32_t code, uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d);
+
+extern uint32_t cpuid_features_b, cpuid_features_c, cpuid_features_d;
+extern uint32_t cpuid_featuresx_b, cpuid_featuresx_c, cpuid_featuresx_d;
+extern uint32_t cpuid_signature;
+extern uint32_t cpuid_max, cpuid_maxx;
+
+#endif

kernel/include/msr.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#define MSR_APIC_BASE     0x0000001B
+#define MSR_REG_EFER      0xc0000080
+#define MSR_REG_STAR      0xc0000081
+#define MSR_REG_LSTAR     0xc0000082
+#define MSR_REG_FMASK     0xc0000084
+#define MSR_REG_USER_GS   0xc0000101
+#define MSR_REG_KERNEL_GS 0xc0000102
+
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+uint64_t msr_read(uint32_t msr);
+void msr_write(uint32_t msr, uint64_t value);
+
+#endif