kernel: string.h, gdt, msr, cpu and ist

kernel-src/include/arch/cpu.h

@@ -0,0 +1,24 @@
+#ifndef _CPU_H
+#define _CPU_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <arch/msr.h>
+#include <arch/ist.h>
+
+typedef struct {
+	uint64_t gdt[7];
+	ist_t ist;
+	int lapicid;
+} cpu_t;
+
+static inline cpu_t *_cpu() {
+	return (cpu_t *)rdmsr(MSR_GSBASE);
+}
+
+static inline void cpu_set(cpu_t *ptr) {
+	wrmsr(MSR_GSBASE, (uint64_t)ptr);
+}
+
+#endif

kernel-src/include/arch/ist.h

@@ -0,0 +1,21 @@
+#ifndef _IST_H
+#define _IST_H
+
+typedef struct {
+	uint32_t reserved;
+	uint64_t rsp0;
+	uint64_t rsp1;
+	uint64_t rsp2;
+	uint64_t reserved2;
+	uint64_t ist1;
+	uint64_t ist2;
+	uint64_t ist3;
+	uint64_t ist4;
+	uint64_t ist5;
+	uint64_t ist6;
+	uint64_t ist7;
+	uint32_t reserved3[3];
+	uint32_t iopb;
+} __attribute__((packed)) ist_t;
+
+#endif

kernel-src/include/arch/msr.h

@@ -0,0 +1,27 @@
+#ifndef _MSR_H
+#define _MSR_H
+
+#include <stdint.h>
+
+#define MSR_EFER 0xC0000080
+#define MSR_STAR 0xC0000081
+#define MSR_LSTAR 0xC0000082
+#define MSR_CSTAR 0xC0000083
+#define MSR_FMASK 0xC0000084
+#define MSR_FSBASE 0xC0000100
+#define MSR_GSBASE 0xC0000101
+#define MSR_KERNELGSBASE 0xC0000102
+
+static inline uint64_t rdmsr(uint32_t which) {
+	uint64_t low,high;
+	asm volatile("rdmsr" : "=a"(low), "=d"(high) : "c"(which));
+	return (high << 32) | low;
+}
+
+static inline void wrmsr(uint32_t which, uint64_t value) {
+	uint32_t low = value & 0xFFFFFFFF;
+	uint32_t high = (value >> 32) & 0xFFFFFFFF;
+	asm volatile("wrmsr" : : "a"(low), "d"(high), "c"(which));
+}
+
+#endif

kernel-src/include/string.h

@@ -0,0 +1,14 @@
+#ifndef _STRING_H
+#define _STRING_H
+
+#include <stddef.h>
+
+size_t strlen(const char *str);
+char *strcpy(char *dest, const char *src);
+char *strcat(char *dest, const char *str);
+void *memcpy(void *dest, void *src, size_t size);
+void *memset(void *dest, unsigned long what, size_t size);
+int strcmp(const char *a, const char *b);
+int strncmp(const char *a, const char *b, size_t c);
+
+#endif