kernel: add a /com1 device

3 files changed, 2 insertions, 63 deletions

diff --git a/src/kernel/arch/i386/tty/serial.c b/src/kernel/arch/i386/tty/serial.c
deleted file mode 100644
index 054f956..0000000
--- a/src/kernel/arch/i386/tty/serial.c
+++ /dev/null
@@ -1,46 +0,0 @@
-#include <kernel/arch/i386/port_io.h>
-#include <kernel/arch/i386/tty/serial.h>
-#include <kernel/panic.h>
-#include <stdint.h>
-
-static const int COM1 = 0x3f8;
-
-static void serial_selftest(void) {
-	char b = 0x69;
-	port_out8(COM1 + 4, 0b00011110); // enable loopback mode
-	port_out8(COM1, b);
-	assert(port_in8(COM1) == b);
-}
-
-void serial_init(void) {
-	// see https://www.sci.muni.cz/docs/pc/serport.txt
-	// set baud rate divisor
-	port_out8(COM1 + 3, 0b10000000); // enable DLAB
-	port_out8(COM1 + 0, 0x01);       // divisor = 1 (low  byte)
-	port_out8(COM1 + 1, 0x00);       //             (high byte)
-
-	port_out8(COM1 + 3, 0b00000011); // 8 bits, no parity, one stop bit
-	port_out8(COM1 + 1, 0x01);       // enable the Data Ready IRQ
-	port_out8(COM1 + 2, 0b11000111); // enable FIFO with 14-bit trigger level (???)
-
-	serial_selftest();
-
-	port_out8(COM1 + 4, 0b00001111); // enable everything in the MCR
-}
-
-static void serial_putchar(char c) {
-	while ((port_in8(COM1 + 5) & 0x20) == 0); // wait for THRE
-	port_out8(COM1, c);
-}
-
-bool serial_poll_read(char *c) {
-	if ((port_in8(COM1 + 5) & 0x01) == 0) // needs DR
-		return false;
-	*c = port_in8(COM1);
-	return true;
-}
-
-void serial_write(const char *buf, size_t len) {
-	for (size_t i = 0; i < len; i++)
-		serial_putchar(buf[i]);
-}
diff --git a/src/kernel/arch/i386/tty/serial.h b/src/kernel/arch/i386/tty/serial.h
deleted file mode 100644
index 808f1aa..0000000
--- a/src/kernel/arch/i386/tty/serial.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#pragma once
-#include <stdbool.h>
-#include <stddef.h>
-
-bool serial_poll_read(char *c);
-void serial_write(const char *buf, size_t len);
-void serial_init(void);
diff --git a/src/kernel/arch/i386/tty/tty.c b/src/kernel/arch/i386/tty/tty.c
index ebe0fd3..ab15aba 100644
--- a/src/kernel/arch/i386/tty/tty.c
+++ b/src/kernel/arch/i386/tty/tty.c
@@ -1,5 +1,4 @@
-#include <kernel/arch/i386/interrupts/irq.h>
-#include <kernel/arch/i386/tty/serial.h>
+#include <kernel/arch/i386/driver/serial.h>
 #include <kernel/arch/i386/tty/vga.h>
 #include <kernel/arch/io.h>
 
@@ -13,14 +12,7 @@ void tty_init(void) {
 }
 
 void tty_read(char *buf, size_t len) {
-	irq_interrupt_flag(true);
-	for (size_t i = 0; i < len; i++) {
-		for (;;) {
-			if (serial_poll_read(&buf[i]))	break;
-			asm("hlt" ::: "memory");
-		}
-	}
-	irq_interrupt_flag(false);
+	serial_read(buf, len);
 }
 
 void tty_write(const char *buf, size_t len) {