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//! Port I/O Operations
pub fn read_byte(port: u16) u8 {
var result: u8 = undefined;
asm volatile ("inb %[port], %[result]"
: [result] "={al}" (result),
: [port] "N{dx}" (port),
);
return result;
}
pub fn write_byte(port: u16, value: u8) void {
asm volatile ("outb %[value], %[port]"
:
: [value] "{al}" (value),
[port] "N{dx}" (port),
);
}
pub fn read_word(port: u16) u16 {
var result: u16 = undefined;
asm volatile ("inw %[port], %[result]"
: [result] "={ax}" (result),
: [port] "N{dx}" (port),
);
return result;
}
pub fn write_word(port: u16, value: u16) void {
asm volatile ("outw %[value], %[port]"
:
: [value] "{ax}" (value),
[port] "N{dx}" (port),
);
}
pub fn read_long(port: u16) u32 {
var result: u32 = undefined;
asm volatile ("inl %[port], %[result]"
: [result] "={eax}" (result),
: [port] "N{dx}" (port),
);
return result;
}
pub fn write_long(port: u16, value: u32) void {
asm volatile ("outl %[value], %[port]"
:
: [value] "{eax}" (value),
[port] "N{dx}" (port),
);
}
pub fn io_wait() void {
write_byte(0x80, 0);
}
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