IDT

2019-05-02 17:29:24 +01:00
parent 390fc87c20
commit 44330e8427
14 changed files with 576 additions and 18 deletions
--- a/kernel/pic.cpp
+++ b/kernel/pic.cpp
@@ -0,0 +1,53 @@
+#include "pic.h"
+
+#include <kernel/kernio.h>
+
+void PIC_Default_Remap() {
+	outb(0x20, 0x11);
+	io_wait();
+    outb(0xA0, 0x11);
+	io_wait();
+    outb(0x21, 0x20);
+	io_wait();
+    outb(0xA1, 0x28);
+	io_wait();
+    outb(0x21, 0x04);
+	io_wait();
+    outb(0xA1, 0x02);
+	io_wait();
+    outb(0x21, 0x01);
+	io_wait();
+    outb(0xA1, 0x01);
+	io_wait();
+    outb(0x21, 0x0);
+	io_wait();
+    outb(0xA1, 0x0);
+}
+
+void PIC_Remap(int offset1, int offset2) {
+	unsigned char a1, a2;
+ 
+	a1 = inb(PIC1_DATA);                        // save masks
+	a2 = inb(PIC2_DATA);
+ 
+	outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4);  // starts the initialization sequence (in cascade mode)
+	io_wait();
+	outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4);
+	io_wait();
+	outb(PIC1_DATA, offset1);                 // ICW2: Master PIC vector offset
+	io_wait();
+	outb(PIC2_DATA, offset2);                 // ICW2: Slave PIC vector offset
+	io_wait();
+	outb(PIC1_DATA, 4);                       // ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100)
+	io_wait();
+	outb(PIC2_DATA, 2);                       // ICW3: tell Slave PIC its cascade identity (0000 0010)
+	io_wait();
+ 
+	outb(PIC1_DATA, ICW4_8086);
+	io_wait();
+	outb(PIC2_DATA, ICW4_8086);
+	io_wait();
+ 
+	outb(PIC1_DATA, a1);   // restore saved masks.
+	outb(PIC2_DATA, a2);
+}