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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.  
  35. /*
  36.  * This is the PIC driver.
  37.  * Programmable Interrupt Controller for UP systems.
  38.  */
  39.  
  40. void i8259_init(void)
  41. {
  42.     /* ICW1: this is ICW1, ICW4 to follow */
  43.     outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4);
  44.  
  45.     /* ICW2: IRQ 0 maps to INT IRQBASE */
  46.     outb(PIC_PIC0PORT2, IVT_IRQBASE);
  47.    
  48.     /* ICW3: pic1 using IRQ IRQ_PIC1 */
  49.     outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);
  50.    
  51.     /* ICW4: i8086 mode */    
  52.     outb(PIC_PIC0PORT2, 1);
  53.  
  54.     /* ICW1: ICW1, ICW4 to follow */
  55.     outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
  56.  
  57.     /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */    
  58.     outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
  59.  
  60.     /* ICW3: pic1 is known as PIC_PIC1ID */
  61.     outb(PIC_PIC1PORT2, PIC_PIC1ID);
  62.  
  63.     /* ICW4: i8086 mode */    
  64.     outb(PIC_PIC1PORT2, 1);
  65.  
  66.     /*
  67.      * Register interrupt handler for the PIC spurious interrupt.
  68.      */
  69.     trap_register(VECTOR_PIC_SPUR, pic_spurious);  
  70.  
  71.     /*
  72.      * Set the enable/disable IRQs handlers.
  73.      * Set the End-of-Interrupt handler.
  74.      */
  75.     enable_irqs_function = pic_enable_irqs;
  76.     disable_irqs_function = pic_disable_irqs;
  77.     eoi_function = pic_eoi;
  78.    
  79.     pic_disable_irqs(0xffff);       /* disable all irq's */
  80.     pic_enable_irqs(1<<IRQ_PIC1);       /* but enable pic1 */
  81. }
  82.  
  83. void pic_enable_irqs(__u16 irqmask)
  84. {
  85.     __u8 x;
  86.    
  87.     if (irqmask & 0xff) {
  88.             x = inb(PIC_PIC0PORT2);
  89.         outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));
  90.     }
  91.     if (irqmask >> 8) {
  92.             x = inb(PIC_PIC1PORT2);
  93.         outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));
  94.     }
  95. }
  96.  
  97. void pic_disable_irqs(__u16 irqmask)
  98. {
  99.     __u8 x;
  100.    
  101.     if (irqmask & 0xff) {
  102.             x = inb(PIC_PIC0PORT2);
  103.         outb(PIC_PIC0PORT2, x | (irqmask & 0xff));
  104.     }
  105.     if (irqmask >> 8) {
  106.             x = inb(PIC_PIC1PORT2);
  107.         outb(PIC_PIC1PORT2, x | (irqmask >> 8));
  108.     }
  109. }
  110.  
  111. void pic_eoi(void)
  112. {
  113.     outb(0x20,0x20);
  114.         outb(0xa0,0x20);
  115. }
  116.  
  117. void pic_spurious(__u8 n, __u32 stack[])
  118. {
  119.     printf("cpu%d: PIC spurious interrupt\n", CPU->id);
  120. }
  121.