From 439d724ce5939cab7a5c858d1829f212e01e0402 Mon Sep 17 00:00:00 2001 From: Franklin Wei Date: Sun, 1 Feb 2015 11:33:16 -0500 Subject: first real commit --- kernel/io.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 kernel/io.c (limited to 'kernel/io.c') diff --git a/kernel/io.c b/kernel/io.c new file mode 100644 index 0000000..9b56b5d --- /dev/null +++ b/kernel/io.c @@ -0,0 +1,19 @@ +#include +#include "io.h" + +void outb(uint16_t port, uint8_t val) +{ + asm volatile ("outb %1, %0": :"dN" (port), "a" (val)); +} +uint8_t inb(uint16_t port) +{ + uint8_t ret; + asm volatile ("inb %1, %0" : "=a" (ret) : "dN" (port)); + return ret; +} +uint16_t inw(uint16_t port) +{ + uint16_t ret; + asm volatile ("inw %1, %0" : "=a" (ret) : "dN" (port)); + return ret; +} -- cgit v1.1