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

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