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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/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.  
  36. /*
  37.  * This is the PIC driver.
  38.  * Programmable Interrupt Controller for UP systems.
  39.  */
  40.  
  41. void i8259_init(void)
  42. {
  43.     /* ICW1: this is ICW1, ICW4 to follow */
  44.     outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4);
  45.  
  46.     /* ICW2: IRQ 0 maps to INT IRQBASE */
  47.     outb(PIC_PIC0PORT2, IVT_IRQBASE);
  48.  
  49.     /* ICW3: pic1 using IRQ IRQ_PIC1 */
  50.     outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);
  51.  
  52.     /* ICW4: i8086 mode */
  53.     outb(PIC_PIC0PORT2, 1);
  54.  
  55.     /* ICW1: ICW1, ICW4 to follow */
  56.     outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
  57.  
  58.     /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
  59.     outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
  60.  
  61.     /* ICW3: pic1 is known as PIC_PIC1ID */
  62.     outb(PIC_PIC1PORT2, IRQ_PIC1);
  63.  
  64.     /* ICW4: i8086 mode */
  65.     outb(PIC_PIC1PORT2, 1);
  66.  
  67.     /*
  68.      * Register interrupt handler for the PIC spurious interrupt.
  69.      */
  70.     trap_register(VECTOR_PIC_SPUR, pic_spurious);  
  71.  
  72.     /*
  73.      * Set the enable/disable IRQs handlers.
  74.      * Set the End-of-Interrupt handler.
  75.      */
  76.     enable_irqs_function = pic_enable_irqs;
  77.     disable_irqs_function = pic_disable_irqs;
  78.     eoi_function = pic_eoi;
  79.  
  80.     pic_disable_irqs(0xffff);       /* disable all irq's */
  81.     pic_enable_irqs(1<<IRQ_PIC1);       /* but enable pic1 */
  82. }
  83.  
  84. void pic_enable_irqs(__u16 irqmask)
  85. {
  86.     __u8 x;
  87.  
  88.     if (irqmask & 0xff) {
  89.         x = inb(PIC_PIC0PORT2);
  90.         outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));
  91.     }
  92.     if (irqmask >> 8) {
  93.         x = inb(PIC_PIC1PORT2);
  94.         outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));
  95.     }
  96. }
  97.  
  98. void pic_disable_irqs(__u16 irqmask)
  99. {
  100.     __u8 x;
  101.  
  102.     if (irqmask & 0xff) {
  103.         x = inb(PIC_PIC0PORT2);
  104.         outb(PIC_PIC0PORT2, x | (irqmask & 0xff));
  105.     }
  106.     if (irqmask >> 8) {
  107.         x = inb(PIC_PIC1PORT2);
  108.         outb(PIC_PIC1PORT2, x | (irqmask >> 8));
  109.     }
  110. }
  111.  
  112. void pic_eoi(void)
  113. {
  114.     outb(0x20,0x20);
  115.     outb(0xa0,0x20);
  116. }
  117.  
  118. void pic_spurious(__u8 n, __native stack[])
  119. {
  120.     printf("cpu%d: PIC spurious interrupt\n", CPU->id);
  121. }
  122.