From 0f78d65d57c7049032278398890941413d2a8e33 Mon Sep 17 00:00:00 2001 From: EmulatedSeasons <89668582+EmulatedSeasons@users.noreply.github.com> Date: Mon, 20 Jan 2025 13:22:39 -0500 Subject: i have no idea i thought this was already in there --- kernel/include/arch/x86_64/io.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 kernel/include/arch/x86_64/io.h diff --git a/kernel/include/arch/x86_64/io.h b/kernel/include/arch/x86_64/io.h new file mode 100644 index 0000000..b99f0ef --- /dev/null +++ b/kernel/include/arch/x86_64/io.h @@ -0,0 +1,32 @@ +#ifndef HW_IO_H +#define HW_IO_H + +#include + +// Used for io access + +static inline void outb(uint16_t port, uint8_t val) +{ + asm volatile ( "outb %0, %1" : : "a"(val), "Nd"(port) :"memory"); + /* There's an outb %al, $imm8 encoding, for compile-time constant port numbers that fit in 8b. (N constraint). + * Wider immediate constants would be truncated at assemble-time (e.g. "i" constraint). + * The outb %al, %dx encoding is the only option for all other cases. + * %1 expands to %dx because port is a uint16_t. %w1 could be used if we had the port number a wider C type */ +} + +static inline uint8_t inb(uint16_t port) +{ + uint8_t ret; + asm volatile ( "inb %1, %0" + : "=a"(ret) + : "Nd"(port) + : "memory"); + return ret; +} + +static inline void io_wait(void) +{ + outb(0x80, 0); +} + +#endif \ No newline at end of file -- cgit v1.2.3-70-g09d2