From 91c323b7c8b60657c0d5caf50d65b6daa48dbdec Mon Sep 17 00:00:00 2001 From: Braiden Vasco Date: Mon, 6 Nov 2017 10:41:28 +0000 Subject: [PATCH] Follow http://wiki.osdev.org/PIC --- arch/pic.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/pic.c b/arch/pic.c index 0de4e6c..dd5ac29 100644 --- a/arch/pic.c +++ b/arch/pic.c @@ -13,6 +13,10 @@ void pic_remap(const unsigned char master_irq_start, const unsigned char slave_i { logger_info_from("pic", "Remap the IRQ table."); + // Save masks + unsigned char master_mask = inportb(PIC_MASTER_DATA); + unsigned char slave_mask = inportb(PIC_SLAVE_DATA); + // Start the initialization sequence outportb(PIC_MASTER_COMMAND, 0x11); outportb(PIC_SLAVE_COMMAND, 0x11); @@ -29,6 +33,7 @@ void pic_remap(const unsigned char master_irq_start, const unsigned char slave_i outportb(PIC_MASTER_DATA, 0x01); outportb(PIC_SLAVE_DATA, 0x01); - outportb(PIC_MASTER_DATA, 0x00); - outportb(PIC_SLAVE_DATA, 0x00); + // Restore masks + outportb(PIC_MASTER_DATA, master_mask); + outportb(PIC_SLAVE_DATA, slave_mask); }