interrupts

1 files changed, 24 insertions, 0 deletions

diff --git a/kernel/pic.c b/kernel/pic.c
new file mode 100644
index 0000000..801556d
--- /dev/null
+++ b/kernel/pic.c
@@ -0,0 +1,24 @@
+#include <io.h>
+#include <pic.h>
+
+void remap_pic(void)
+{
+	// save masks
+//	uint8_t a1 = inb(PIC1_DATA);
+//	uint8_t a2 = inb(PIC2_DATA);
+
+	// starts the initialization sequence (in cascade mode)
+	outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4);
+	outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4);
+	outb(PIC1_DATA, 0x20);				// ICW2: Master PIC vector offset
+	outb(PIC2_DATA, 0x28);				// ICW2: Slave PIC vector offset
+	outb(PIC1_DATA, 4);				// ICW3: tell Master PIC that there is a slave PIC at IRQ2 (0000 0100)
+	outb(PIC2_DATA, 2);				// ICW3: tell Slave PIC its cascade identity (0000 0010)
+
+	outb(PIC1_DATA, ICW4_8086);
+	outb(PIC2_DATA, ICW4_8086);
+
+	// mask interrupts
+	outb(PIC1_DATA, 0xfd);
+	outb(PIC2_DATA, 0xff);
+}