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kernel/include/io/ports.h

@@ -0,0 +1,40 @@
+#ifndef PORTS_H
+#define PORTS_H
+
+#include <stdint.h>
+
+static inline uint8_t inb(uint16_t port) {
+    uint8_t result;
+    asm volatile ("inb %1, %0" : "=a"(result) : "Nd"(port));
+    return result;
+}
+
+static inline void outb(uint16_t port, uint8_t data) {
+    asm volatile ("outb %0, %1" : : "a"(data), "Nd"(port));
+}
+
+static inline uint16_t inw(uint16_t port) {
+    uint16_t result;
+    asm volatile ("inw %1, %0" : "=a"(result) : "Nd"(port));
+    return result;
+}
+
+static inline void outw(uint16_t port, uint16_t data) {
+    asm volatile ("outw %0, %1" : : "a"(data), "Nd"(port));
+}
+
+static inline uint32_t inl(uint16_t port) {
+    uint32_t result;
+    asm volatile ("inl %1, %0" : "=a"(result) : "Nd"(port));
+    return result;
+}
+
+static inline void outl(uint16_t port, uint32_t data) {
+    asm volatile ("outl %0, %1" : : "a"(data), "Nd"(port));
+}
+
+static inline void io_wait(void) {
+    outb(0x80, 0);
+}
+
+#endif 

kernel/include/io/serial.h

@@ -0,0 +1,51 @@
+#ifndef SERIAL_H
+#define SERIAL_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include <stdarg.h>
+
+#define COM1 0x3F8
+#define COM2 0x2F8
+#define COM3 0x3E8
+#define COM4 0x2E8
+
+#define SERIAL_DATA_PORT(base)          (base)
+#define SERIAL_FIFO_COMMAND_PORT(base)  (base + 2)
+#define SERIAL_LINE_COMMAND_PORT(base)  (base + 3)
+#define SERIAL_MODEM_COMMAND_PORT(base) (base + 4)
+#define SERIAL_LINE_STATUS_PORT(base)   (base + 5)
+
+#define SERIAL_LSR_DATA_READY           0x01
+#define SERIAL_LSR_OVERRUN_ERROR        0x02
+#define SERIAL_LSR_PARITY_ERROR          0x04
+#define SERIAL_LSR_FRAMING_ERROR         0x08
+#define SERIAL_LSR_BREAK_INDICATOR       0x10
+#define SERIAL_LSR_TRANSMIT_HOLDING_EMPTY 0x20
+#define SERIAL_LSR_TRANSMIT_EMPTY        0x40
+#define SERIAL_LSR_FIFO_ERROR            0x80
+
+void serial_initialize(uint16_t port, uint32_t baud_rate);
+
+int serial_received_port(uint16_t port);
+char serial_read_port(uint16_t port);
+int serial_is_transmit_empty_port(uint16_t port);
+void serial_write_port(uint16_t port, char c);
+void serial_writestring_port(uint16_t port, const char* str);
+void serial_printf_port(uint16_t port, const char* format, ...);
+
+int serial_received(void);
+char serial_read(void);
+int serial_is_transmit_empty(void);
+void serial_write(char c);
+void serial_writestring(const char* str);
+void serial_writebuf(const char* buf, size_t len);
+void serial_printf(const char* format, ...);
+
+uint16_t serial_get_default_port(void);
+
+void serial_set_default_port(uint16_t port);
+void serial_force_unlock(void);
+
+#endif