xref: /xv6-public/picirq.c (revision 4f14d8d1) 
1 #include "types.h"
2 #include "x86.h"
3 #include "traps.h"
4 
5 // I/O Addresses of the two programmable interrupt controllers
6 #define IO_PIC1         0x20    // Master (IRQs 0-7)
7 #define IO_PIC2         0xA0    // Slave (IRQs 8-15)
8 
9 // Don't use the 8259A interrupt controllers.  Xv6 assumes SMP hardware.
10 void
picinit(void)11 picinit(void)
12 {
13   // mask all interrupts
14   outb(IO_PIC1+1, 0xFF);
15   outb(IO_PIC2+1, 0xFF);
16 }
17 
18 //PAGEBREAK!
19 // Blank page.
20