kernel: io.h

kernel-src/include/arch/io.h

@@ -0,0 +1,27 @@
+#ifndef IO_H
+#define IO_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+static inline void outd(uint16_t port, uint32_t data) {
+	asm volatile("out %%eax, %%dx" : : "a"(data), "d"(port));
+}
+
+static inline uint32_t ind(uint16_t port) {
+	uint32_t ret;
+	asm volatile("in %%dx, %%eax" : "=a"(ret) : "d"(port));
+	return ret;
+}
+
+static inline void outb(uint16_t port, uint8_t data) {
+	asm volatile("out %%al, %%dx" : : "a"(data), "d"(port));
+}
+
+static inline uint8_t inb(uint16_t port) {
+	uint8_t ret;
+	asm volatile ("in %%dx, %%al" : "=a"(ret) : "d"(port));
+	return ret;
+}
+
+#endif