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50 lines
966 B
50 lines
966 B
// Function to read a byte from port
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unsigned char inb(unsigned short port) {
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unsigned char res;
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__asm__("in %%dx, %%al" : "=a" (res) : "d" (port));
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return res;
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}
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// to write a byte to port
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void outb(unsigned short port, unsigned char data) {
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__asm__("out %%al, %%dx" : :"a" (data), "d" (port));
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}
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// Read word from port
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unsigned short inw(unsigned short port) {
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unsigned short res;
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__asm__("in %%dx, %%ax" : "=a" (res) : "d" (port));
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return res;
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}
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// write word to port
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void outw(unsigned short port, unsigned short data) {
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__asm__("out %%ax, %%dx" : :"a" (data), "d" (port));
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}
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static inline void io_wait() { outb(0x80, 0); }
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unsigned char inb_w(unsigned short port) {
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inb(port);
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io_wait();
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}
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void outb_w(unsigned short port, unsigned char data) {
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outb(port, data);
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io_wait();
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}
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unsigned short inw_w(unsigned short port) {
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inw(port);
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io_wait();
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}
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void outw_w(unsigned short port, unsigned short data) {
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outw(port, data);
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io_wait();
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}
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