38 lines
1017 B
C
38 lines
1017 B
C
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#include <drivers/serial/serial.h>
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#include <common.h>
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#define COM1 0x3F8
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int is_transmit_empty() {
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return inb(COM1 + 5) & 0x20;
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}
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void write_serial(char a) {
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while (is_transmit_empty() == 0);
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outb(COM1, a);
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}
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void print_serial(const char* str) {
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for (int i = 0; str[i] != '\0'; i++) {
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write_serial(str[i]);
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}
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}
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void print_serial_hex(uint32_t val) {
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char hex_chars[] = "0123456789ABCDEF";
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print_serial("0x");
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for (int i = 28; i >= 0; i -= 4) {
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write_serial(hex_chars[(val >> i) & 0x0F]);
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}
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}
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void init_serial() {
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outb(COM1 + 1, 0x00); // Disable all interrupts
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outb(COM1 + 3, 0x80); // Enable DLAB (set baud rate divisor)
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outb(COM1 + 0, 0x01); // Set divisor to 1 (lo byte) -> 115200 baud
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outb(COM1 + 1, 0x00); // (hi byte)
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outb(COM1 + 3, 0x03); // 8 bits, no parity, one stop bit
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outb(COM1 + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
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outb(COM1 + 4, 0x0B); // IRQs enabled, RTS/DSR set
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}
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