feat(serial): add serial initialization and gitignore

Signed-off-by: Julien CLEMENT <julien.clement@epita.fr>

.gitignore

@@ -0,0 +1,14 @@
+*.o
+*.d
+*.a
+*.iso
+iso/
+
+k/k
+
+roms/chichehunter/hunter
+roms/chichepong/pong
+roms/chichevaders/vaders
+roms/perrodlauncher/perrod
+roms/skate/skate
+roms/yakanoid/yakanoid

k/Makefile

@@ -30,6 +30,7 @@ OBJS	= \
 	  libvga.o \
 	  list.o \
 	  memory.o \
+	  serial.o
 
 
 DEPS = $(OBJS:.o=.d)

k/k.c

@@ -24,6 +24,7 @@
 #include <k/kstd.h>
 
 #include "multiboot.h"
+#include "stdio.h"
 
 
 void k_main(unsigned long magic, multiboot_info_t *info)
@@ -34,6 +35,7 @@ void k_main(unsigned long magic, multiboot_info_t *info)
     char star[4] = "|/-\\";
     char *fb = (void *)0xb8000;
 
+    printf("bonjour\r\n");
     for (unsigned i = 0; ; ) {
         *fb = star[i++ % 4];
     }

k/serial.c

@@ -0,0 +1,26 @@
+#include <stddef.h>
+
+#include "serial.h"
+#include "io.h"
+
+void set_baud_rate(void)
+{
+    u8 line_control_register = inb(COM1 + 3);
+    outb(COM1 + 3, DLAB | line_control_register);
+    outb(COM1, 3);
+    outb(COM1 + 1, 0);
+    outb(COM1 + 3, line_control_register);
+}
+
+void serial_init(void)
+{
+    outb(COM1 + 3, NO_PARITY | EIGHT_BITS_LENGTH);
+    outb(COM1 + 2, FIFO | TRIGGER_LVL_14 | CLEAR_TRANSMIT_FIFO
+            | CLEAR_RECEIVE_FIFO);
+    outb(COM1 + 1, ENABLE_TRANSMITTER);
+}
+
+int write(const char *buf, size_t count)
+{
+    return 0;
+}

k/serial.h

@@ -0,0 +1,24 @@
+#ifndef SERIAL_H
+#define SERIAL_H
+
+#define COM1 0x3f8
+#define COM2 0x2f8
+#define COM3 0x3e8
+#define COM4 0x2e8
+
+#define ENABLE_TRANSMITTER (0x1 << 1)
+
+#define FIFO 0x1
+#define TRIGGER_LVL_14 (0x3 << 6)
+#define CLEAR_TRANSMIT_FIFO (0x1 << 2)
+#define CLEAR_RECEIVE_FIFO (0x1 << 1)
+
+#define NO_PARITY 0x0
+#define EIGHT_BITS_LENGTH 0x3
+
+#define DLAB (0x1 << 7)
+
+void serial_init(void);
+int write(const char *buf, size_t count);
+
+#endif   /* SERIAL_H */