PIT

2026-06-13 13:27:39 -05:00
parent 00fb70c25b
commit 3ecbcdf369
13 changed files with 106 additions and 14 deletions
--- a/kernel/drivers/pic/pic_stubs.S
+++ b/kernel/drivers/pic/pic_stubs.S
@@ -0,0 +1,51 @@
+#include "drivers/pic/pic.h"
+
+.code32
+.global init_pic
+init_pic:
+    # init command
+    mov $0x11, %al
+    outb %al, $PIC1_COMMAND
+    outb %al, $PIC2_COMMAND
+
+    # vector offsets
+    mov $0x20, %al
+    outb %al, $PIC1_DATA
+    mov $0x28, %al
+    outb %al, $PIC2_DATA
+
+    # cascade 
+    mov $0x04, %al
+    outb %al, $PIC1_DATA
+    mov $0x02, %al
+    outb %al, $PIC2_DATA 
+
+    # env
+    mov $0x01, %al
+    outb %al, $PIC1_DATA
+    outb %al, $PIC2_DATA 
+
+    # mask all 
+    mov $0xFC, %al
+    outb %al, $PIC1_DATA
+    mov $0xFF, %al
+    outb %al, $PIC2_DATA 
+
+    ret
+
+.global io_wait
+io_wait: 
+    ret
+
+.global send_eoi_master
+send_eoi_master:
+    mov $0x20, %al
+    outb %al, $PIC1_COMMAND
+    ret 
+
+.global send_eoi_slave 
+send_eoi_slave:
+    mov $0x20, %al
+    outb %al, $PIC2_COMMAND
+    call send_eoi_master
+    ret