24 lines
637 B
C
24 lines
637 B
C
unsigned char port_byte_in(unsigned char port) {
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unsigned char res;
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/*
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* `"=a" (res)' means: put result of `al' into `res' variable
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* `"d" (port)' means: load `port' into `dx'.
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*/
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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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void port_byte_out(unsigned char port, unsigned char data) {
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__asm__("out %%al, %%dx" : : "a" (data), "d" (port));
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}
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unsigned short port_word_in(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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void port_word_out(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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