56 lines
1.5 KiB
Rust
56 lines
1.5 KiB
Rust
#![allow(dead_code)]
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/// Read a `u8`-sized value from `port`.
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pub fn inb(port: u16) -> u8 {
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// The registers for the `in` and `out` instructions are always the
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// same: `a` for value, and `d` for the port address.
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let result: u8;
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unsafe { asm!("inb %dx, %al" : "={al}"(result) : "{dx}"(port) :: "volatile") };
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result
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}
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/// Write a `u8`-sized `value` to `port`.
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pub fn outb(port: u16, value: u8) {
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unsafe { asm!("outb %al, %dx" :: "{dx}"(port), "{al}"(value) :: "volatile") };
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}
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/// Read a `u16`-sized value from `port`.
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pub fn inw(port: u16) -> u16 {
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let result: u16;
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unsafe { asm!("inw %dx, %ax" : "={ax}"(result) : "{dx}"(port) :: "volatile") };
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result
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}
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/// Write a `u8`-sized `value` to `port`.
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pub fn outw(port: u16, value: u16) {
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unsafe { asm!("outw %ax, %dx" :: "{dx}"(port), "{ax}"(value) :: "volatile") };
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}
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/// Read a `u32`-sized value from `port`.
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pub fn inl(port: u16) -> u32 {
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let result: u32;
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unsafe { asm!("inl %dx, %eax" : "={eax}"(result) : "{dx}"(port) :: "volatile") };
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result
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}
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/// Write a `u32`-sized `value` to `port`.
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pub fn outl(port: u16, value: u32) {
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unsafe { asm!("outl %eax, %dx" :: "{dx}"(port), "{eax}"(value) :: "volatile") };
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}
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/// Halt system
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pub fn halt() -> ! {
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unsafe { asm!("cli" : : : : "volatile") };
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loop {
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unsafe { asm!("hlt" : : : : "volatile") };
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}
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}
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/// wait for an io operation to complete
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pub fn io_wait() {
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unsafe {
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asm!("jmp 1f\n\t
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1:jmp 2f\n\t
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2:" : : : : "volatile")
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}
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}
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