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Annotation of qemu/roms/seabios/src/pic.c, revision 1.1.1.1

1.1       root        1: // Helpers for working with i8259 interrupt controller.
                      2: //
                      3: // Copyright (C) 2008  Kevin O'Connor <[email protected]>
                      4: // Copyright (C) 2002  MandrakeSoft S.A.
                      5: //
                      6: // This file may be distributed under the terms of the GNU LGPLv3 license.
                      7: 
                      8: #include "pic.h" // get_pic1_isr
                      9: #include "util.h" // dprintf
                     10: #include "config.h" // CONFIG_*
                     11: 
                     12: void
                     13: pic_setup()
                     14: {
                     15:     dprintf(3, "init pic\n");
                     16:     // Send ICW1 (select OCW1 + will send ICW4)
                     17:     outb(0x11, PORT_PIC1_CMD);
                     18:     outb(0x11, PORT_PIC2_CMD);
                     19:     // Send ICW2 (base irqs: 0x08-0x0f for irq0-7, 0x70-0x77 for irq8-15)
                     20:     outb(0x08, PORT_PIC1_DATA);
                     21:     outb(0x70, PORT_PIC2_DATA);
                     22:     // Send ICW3 (cascaded pic ids)
                     23:     outb(0x04, PORT_PIC1_DATA);
                     24:     outb(0x02, PORT_PIC2_DATA);
                     25:     // Send ICW4 (enable 8086 mode)
                     26:     outb(0x01, PORT_PIC1_DATA);
                     27:     outb(0x01, PORT_PIC2_DATA);
                     28:     // Mask all irqs (except cascaded PIC2 irq)
                     29:     outb(~PIC1_IRQ2, PORT_PIC1_DATA);
                     30:     outb(~0, PORT_PIC2_DATA);
                     31: }
                     32: 
                     33: // Handler for otherwise unused hardware irqs.
                     34: void VISIBLE16
                     35: handle_hwpic1(struct bregs *regs)
                     36: {
                     37:     dprintf(DEBUG_ISR_hwpic1, "handle_hwpic1 irq=%x\n", get_pic1_isr());
                     38:     eoi_pic1();
                     39: }
                     40: 
                     41: void VISIBLE16
                     42: handle_hwpic2(struct bregs *regs)
                     43: {
                     44:     dprintf(DEBUG_ISR_hwpic2, "handle_hwpic2 irq=%x\n", get_pic2_isr());
                     45:     eoi_pic2();
                     46: }

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