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Rev 2439 Rev 3902
Line 47... Line 47...
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static void pic_spurious(int n, istate_t *istate);
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static void pic_spurious(int n, istate_t *istate);
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void i8259_init(void)
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void i8259_init(void)
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{
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{
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    /* ICW1: this is ICW1, ICW4 to follow */
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    /* ICW1: this is ICW1, ICW4 to follow */
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    outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4);
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    pio_write_8(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4);
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    /* ICW2: IRQ 0 maps to INT IRQBASE */
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    /* ICW2: IRQ 0 maps to INT IRQBASE */
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    outb(PIC_PIC0PORT2, IVT_IRQBASE);
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    pio_write_8(PIC_PIC0PORT2, IVT_IRQBASE);
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    /* ICW3: pic1 using IRQ IRQ_PIC1 */
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    /* ICW3: pic1 using IRQ IRQ_PIC1 */
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    outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);
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    pio_write_8(PIC_PIC0PORT2, 1 << IRQ_PIC1);
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    /* ICW4: i8086 mode */
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    /* ICW4: i8086 mode */
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    outb(PIC_PIC0PORT2, 1);
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    pio_write_8(PIC_PIC0PORT2, 1);
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    /* ICW1: ICW1, ICW4 to follow */
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    /* ICW1: ICW1, ICW4 to follow */
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    outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
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    pio_write_8(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
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    /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
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    /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
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    outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
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    pio_write_8(PIC_PIC1PORT2, IVT_IRQBASE + 8);
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    /* ICW3: pic1 is known as IRQ_PIC1 */
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    /* ICW3: pic1 is known as IRQ_PIC1 */
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    outb(PIC_PIC1PORT2, IRQ_PIC1);
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    pio_write_8(PIC_PIC1PORT2, IRQ_PIC1);
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    /* ICW4: i8086 mode */
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    /* ICW4: i8086 mode */
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    outb(PIC_PIC1PORT2, 1);
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    pio_write_8(PIC_PIC1PORT2, 1);
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    /*
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    /*
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     * Register interrupt handler for the PIC spurious interrupt.
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     * Register interrupt handler for the PIC spurious interrupt.
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     */
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     */
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    exc_register(VECTOR_PIC_SPUR, "pic_spurious", (iroutine) pic_spurious);
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    exc_register(VECTOR_PIC_SPUR, "pic_spurious", (iroutine) pic_spurious);
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void pic_enable_irqs(uint16_t irqmask)
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void pic_enable_irqs(uint16_t irqmask)
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{
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{
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    uint8_t x;
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    uint8_t x;
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    if (irqmask & 0xff) {
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    if (irqmask & 0xff) {
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        x = inb(PIC_PIC0PORT2);
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        x = pio_read_8(PIC_PIC0PORT2);
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        outb(PIC_PIC0PORT2, (uint8_t) (x & (~(irqmask & 0xff))));
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        pio_write_8(PIC_PIC0PORT2, (uint8_t) (x & (~(irqmask & 0xff))));
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    }
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    }
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    if (irqmask >> 8) {
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    if (irqmask >> 8) {
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        x = inb(PIC_PIC1PORT2);
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        x = pio_read_8(PIC_PIC1PORT2);
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        outb(PIC_PIC1PORT2, (uint8_t) (x & (~(irqmask >> 8))));
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        pio_write_8(PIC_PIC1PORT2, (uint8_t) (x & (~(irqmask >> 8))));
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    }
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    }
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}
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}
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void pic_disable_irqs(uint16_t irqmask)
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void pic_disable_irqs(uint16_t irqmask)
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{
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{
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    uint8_t x;
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    uint8_t x;
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    if (irqmask & 0xff) {
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    if (irqmask & 0xff) {
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        x = inb(PIC_PIC0PORT2);
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        x = pio_read_8(PIC_PIC0PORT2);
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        outb(PIC_PIC0PORT2, (uint8_t) (x | (irqmask & 0xff)));
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        pio_write_8(PIC_PIC0PORT2, (uint8_t) (x | (irqmask & 0xff)));
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    }
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    }
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    if (irqmask >> 8) {
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    if (irqmask >> 8) {
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        x = inb(PIC_PIC1PORT2);
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        x = pio_read_8(PIC_PIC1PORT2);
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        outb(PIC_PIC1PORT2, (uint8_t) (x | (irqmask >> 8)));
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        pio_write_8(PIC_PIC1PORT2, (uint8_t) (x | (irqmask >> 8)));
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    }
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    }
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}
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}
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void pic_eoi(void)
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void pic_eoi(void)
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{
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{
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    outb(0x20, 0x20);
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    pio_write_8(0x20, 0x20);
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    outb(0xa0, 0x20);
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    pio_write_8(0xa0, 0x20);
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}
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}
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void pic_spurious(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
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void pic_spurious(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
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{
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{
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#ifdef CONFIG_DEBUG
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#ifdef CONFIG_DEBUG