First commit, Vystem v0.1

shelter/lib/include/cpu/asm.h

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: MPL-2.0
+#ifndef SH_LIB_ASM_H
+#define SH_LIB_ASM_H
+#include "std/type.h"
+#include "std/status.h"
+// inb instruction wrapper
+static inline sh_uint8 sh_asm_inb(sh_uint16 port) {
+  sh_uint8 val;
+  __asm__ volatile ("inb %1, %0":"=a"(val):"Nd"(port));
+  return val;
+}
+// outb instruction wrapper
+static inline void sh_asm_outb(sh_uint16 port,sh_uint8 val) {
+  __asm__ volatile ("outb %0, %1"::"a"(val),"Nd"(port));
+}
+// rdtsc instruction wrapper
+static inline sh_uint64 sh_asm_rdtsc() {
+  sh_uint32 lo,hi;
+  __asm__ volatile ("rdtsc":"=a"(lo),"=d"(hi));
+  return ((sh_uint64)hi<<32)|lo;
+}
+// invlpg instruction wrapper
+static inline void sh_asm_invlpg(void *addr) {
+  __asm__ volatile ("invlpg (%0)"::"r"(addr):"memory");
+}
+#endif