diff options
Diffstat (limited to 'picirq.c')
| -rw-r--r-- | picirq.c | 18 |
1 files changed, 9 insertions, 9 deletions
@@ -4,10 +4,10 @@ #include "defs.h" // I/O Addresses of the two 8259A programmable interrupt controllers -#define IO_PIC1 0x20 // Master (IRQs 0-7) -#define IO_PIC2 0xA0 // Slave (IRQs 8-15) +#define IO_PIC1 0x20 // Master (IRQs 0-7) +#define IO_PIC2 0xA0 // Slave (IRQs 8-15) -#define IRQ_SLAVE 2 // IRQ at which slave connects to master +#define IRQ_SLAVE 2 // IRQ at which slave connects to master // Current IRQ mask. // Initial IRQ mask has interrupt 2 enabled (for slave 8259A). @@ -49,19 +49,19 @@ pic_init(void) // n: 1 = special fully nested mode // b: 1 = buffered mode // m: 0 = slave PIC, 1 = master PIC - // (ignored when b is 0, as the master/slave role - // can be hardwired). + // (ignored when b is 0, as the master/slave role + // can be hardwired). // a: 1 = Automatic EOI mode // p: 0 = MCS-80/85 mode, 1 = intel x86 mode outb(IO_PIC1+1, 0x3); // Set up slave (8259A-2) - outb(IO_PIC2, 0x11); // ICW1 - outb(IO_PIC2+1, IRQ_OFFSET + 8); // ICW2 - outb(IO_PIC2+1, IRQ_SLAVE); // ICW3 + outb(IO_PIC2, 0x11); // ICW1 + outb(IO_PIC2+1, IRQ_OFFSET + 8); // ICW2 + outb(IO_PIC2+1, IRQ_SLAVE); // ICW3 // NB Automatic EOI mode doesn't tend to work on the slave. // Linux source code says it's "to be investigated". - outb(IO_PIC2+1, 0x3); // ICW4 + outb(IO_PIC2+1, 0x3); // ICW4 // OCW3: 0ef01prs // ef: 0x = NOP, 10 = clear specific mask, 11 = set specific mask |