From 912d2e3c7eb1baa71dda2c0a28aa5809eaa96f27 Mon Sep 17 00:00:00 2001 From: dzwdz Date: Sat, 16 Jul 2022 13:33:00 +0200 Subject: amd64: barely boot into kernel code --- src/kernel/arch/amd64/port_io.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 src/kernel/arch/amd64/port_io.h (limited to 'src/kernel/arch/amd64/port_io.h') diff --git a/src/kernel/arch/amd64/port_io.h b/src/kernel/arch/amd64/port_io.h new file mode 100644 index 0000000..eac9331 --- /dev/null +++ b/src/kernel/arch/amd64/port_io.h @@ -0,0 +1,22 @@ +#include + +static inline void port_out8(uint16_t port, uint8_t val) { + asm volatile("outb %0, %1" : : "a" (val), "Nd" (port)); +} + +static inline void port_out16(uint16_t port, uint16_t val) { + asm volatile("outw %0, %1" : : "a" (val), "Nd" (port)); +} + +static inline uint8_t port_in8(uint16_t port) { + uint8_t val; + asm volatile("inb %1, %0" : "=a" (val) : "Nd" (port)); + return val; +} + +static inline uint16_t port_in16(uint16_t port) { + uint16_t val; + asm volatile("inw %1, %0" : "=a" (val) : "Nd" (port)); + return val; +} + -- cgit v1.2.3