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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <arch/drivers/i8259.h>
  30. #include <cpu.h>
  31. #include <arch/types.h>
  32. #include <arch/asm.h>
  33. #include <arch.h>
  34. #include <print.h>
  35. #include <interrupt.h>
  36.  
  37. /*
  38.  * This is the PIC driver.
  39.  * Programmable Interrupt Controller for UP systems.
  40.  */
  41.  
  42. static void pic_spurious(int n, istate_t *istate);
  43.  
  44. void i8259_init(void)
  45. {
  46.     /* ICW1: this is ICW1, ICW4 to follow */
  47.     outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4);
  48.  
  49.     /* ICW2: IRQ 0 maps to INT IRQBASE */
  50.     outb(PIC_PIC0PORT2, IVT_IRQBASE);
  51.  
  52.     /* ICW3: pic1 using IRQ IRQ_PIC1 */
  53.     outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);
  54.  
  55.     /* ICW4: i8086 mode */
  56.     outb(PIC_PIC0PORT2, 1);
  57.  
  58.     /* ICW1: ICW1, ICW4 to follow */
  59.     outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
  60.  
  61.     /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
  62.     outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
  63.  
  64.     /* ICW3: pic1 is known as IRQ_PIC1 */
  65.     outb(PIC_PIC1PORT2, IRQ_PIC1);
  66.  
  67.     /* ICW4: i8086 mode */
  68.     outb(PIC_PIC1PORT2, 1);
  69.  
  70.     /*
  71.      * Register interrupt handler for the PIC spurious interrupt.
  72.      */
  73.     exc_register(VECTOR_PIC_SPUR, "pic_spurious", (iroutine) pic_spurious);
  74.  
  75.     /*
  76.      * Set the enable/disable IRQs handlers.
  77.      * Set the End-of-Interrupt handler.
  78.      */
  79.     enable_irqs_function = pic_enable_irqs;
  80.     disable_irqs_function = pic_disable_irqs;
  81.     eoi_function = pic_eoi;
  82.  
  83.     pic_disable_irqs(0xffff);       /* disable all irq's */
  84.     pic_enable_irqs(1<<IRQ_PIC1);       /* but enable pic1 */
  85. }
  86.  
  87. void pic_enable_irqs(__u16 irqmask)
  88. {
  89.     __u8 x;
  90.  
  91.     if (irqmask & 0xff) {
  92.         x = inb(PIC_PIC0PORT2);
  93.         outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));
  94.     }
  95.     if (irqmask >> 8) {
  96.         x = inb(PIC_PIC1PORT2);
  97.         outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));
  98.     }
  99. }
  100.  
  101. void pic_disable_irqs(__u16 irqmask)
  102. {
  103.     __u8 x;
  104.  
  105.     if (irqmask & 0xff) {
  106.         x = inb(PIC_PIC0PORT2);
  107.         outb(PIC_PIC0PORT2, x | (irqmask & 0xff));
  108.     }
  109.     if (irqmask >> 8) {
  110.         x = inb(PIC_PIC1PORT2);
  111.         outb(PIC_PIC1PORT2, x | (irqmask >> 8));
  112.     }
  113. }
  114.  
  115. void pic_eoi(void)
  116. {
  117.     outb(0x20,0x20);
  118.     outb(0xa0,0x20);
  119. }
  120.  
  121. void pic_spurious(int n, istate_t *istate)
  122. {
  123. #ifdef CONFIG_DEBUG
  124.     printf("cpu%d: PIC spurious interrupt\n", CPU->id);
  125. #endif
  126. }
  127.