diff options
Diffstat (limited to 'boot/startup-x86_64.s')
| -rw-r--r-- | boot/startup-x86_64.s | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/boot/startup-x86_64.s b/boot/startup-x86_64.s index 4c4cc21..9198a9f 100644 --- a/boot/startup-x86_64.s +++ b/boot/startup-x86_64.s @@ -187,7 +187,6 @@ clear_bss: ; initialize IDT and PICs call setup_idt - call reprogram_pics fninit ; activate FPU @@ -293,51 +292,6 @@ setup_idt: lidt [idt_descr] ret -; -; Reprogram the PICs (programmable interrupt controllers) to have all 15 -; hardware interrupts in sequence in the IDT. -; - -reprogram_pics: - mov al, 0x11 ; ICW1: 8086 mode with ICW4 - out 0x20, al - call delay - out 0xa0, al - call delay - mov al, 0x20 ; ICW2 master: IRQ # offset (32) - out 0x21, al - call delay - mov al, 0x28 ; ICW2 slave: IRQ # offset (40) - out 0xa1, al - call delay - mov al, 0x04 ; ICW3 master: slaves with IRQs - out 0x21, al - call delay - mov al, 0x02 ; ICW3 slave: connected to master's IRQ2 - out 0xa1, al - call delay - mov al, 0x03 ; ICW4: 8086 mode and automatic EOI - out 0x21, al - call delay - out 0xa1, al - call delay - - mov al, 0xff ; Mask/disable hardware interrupts - out 0xa1, al ; in the PICs. Only interrupt #2, which - call delay ; serves for cascading both PICs, is - mov al, 0xfb ; allowed. - out 0x21, al - - ret - -; -; Short delay for in/out instructions -; - -delay: - jmp .L2 -.L2: - ret [SECTION .data] |