From 8b0953d8cdbf676cf100bcb0f77a0c82755b53ae Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Tue, 19 Sep 2023 15:38:34 +0200
Subject: kernel: use HPET timer for sleeps

not strictly necessary, but this should improve:
1. sleep performance
2. power efficiency when idle
---
 src/kernel/arch/amd64/interrupts/irq.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

(limited to 'src/kernel/arch/amd64/interrupts/irq.c')

diff --git a/src/kernel/arch/amd64/interrupts/irq.c b/src/kernel/arch/amd64/interrupts/irq.c
index e900450..f2f11fb 100644
--- a/src/kernel/arch/amd64/interrupts/irq.c
+++ b/src/kernel/arch/amd64/interrupts/irq.c
@@ -5,12 +5,6 @@
 static const int PIC1 = 0x20;
 static const int PIC2 = 0xA0;
 
-static void pit_init(void) {
-	uint16_t divisor = 1193;
-	port_out8(0x40, divisor & 0xFF);
-	port_out8(0x40, divisor >> 8);
-}
-
 void irq_init(void) {
 	port_out8(PIC1, 0x11); /* start init sequence */
 	port_out8(PIC2, 0x11);
@@ -26,15 +20,13 @@ void irq_init(void) {
 	uint16_t mask = 0xffff;
 	mask &= ~(1 << 2); // cascade
 	mask &= ~(1 << IRQ_COM1);
-	mask &= ~(1 << IRQ_PIT);
 	mask &= ~(1 << IRQ_PS2KB);
 	mask &= ~(1 << IRQ_PS2MOUSE);
 	mask &= ~(1 << IRQ_RTL8139);
+	mask &= ~(1 << IRQ_HPET);
 
 	port_out8(PIC1+1, mask & 0xff);
 	port_out8(PIC2+1, (mask >> 8) & 0xff);
-
-	pit_init();
 }
 
 void irq_eoi(uint8_t line) {
-- 
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