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| author | Jon Santmyer <jon@jonsantmyer.com> | 2024-03-11 21:30:31 -0400 |
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| committer | Jon Santmyer <jon@jonsantmyer.com> | 2024-03-11 21:30:31 -0400 |
| commit | d1ff7bcc91886626dc9060ec5fb67ee102ab7c1d (patch) | |
| tree | 8f0b5cd8aad31089131785dc6e37b659490f9955 /arch/x86_64/uart.h | |
| download | jove-kernel-d1ff7bcc91886626dc9060ec5fb67ee102ab7c1d.tar.gz jove-kernel-d1ff7bcc91886626dc9060ec5fb67ee102ab7c1d.tar.bz2 jove-kernel-d1ff7bcc91886626dc9060ec5fb67ee102ab7c1d.zip | |
usermode capable kernel with logging syscall
Diffstat (limited to 'arch/x86_64/uart.h')
| -rw-r--r-- | arch/x86_64/uart.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86_64/uart.h b/arch/x86_64/uart.h new file mode 100644 index 0000000..8386eb7 --- /dev/null +++ b/arch/x86_64/uart.h @@ -0,0 +1,19 @@ +#ifndef JOVE_KERNEL_ARCH_x86_64_UART_H +#define JOVE_KERNEL_ARCH_x86_64_UART_H 1 + +#include "lib/jove.h" +#include <stdint.h> + +ALWAYS_INLINE uint8_t pinb(uint16_t port) +{ + uint8_t v; + __asm__ volatile("inb %1, %0": "=a"(v): "Nd"(port)); + return v; +} + +ALWAYS_INLINE void poutb(uint16_t port, uint8_t b) +{ + __asm__ volatile("outb %0, %1":: "a"(b), "Nd"(port)); +} + +#endif |