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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.  /** @addtogroup ia32  
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <arch/drivers/i8259.h>
  36. #include <cpu.h>
  37. #include <arch/types.h>
  38. #include <arch/asm.h>
  39. #include <arch.h>
  40. #include <print.h>
  41. #include <interrupt.h>
  42.  
  43. /*
  44.  * This is the PIC driver.
  45.  * Programmable Interrupt Controller for UP systems.
  46.  */
  47.  
  48. static void pic_spurious(int n, istate_t *istate);
  49.  
  50. void i8259_init(void)
  51. {
  52.     /* ICW1: this is ICW1, ICW4 to follow */
  53.     outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4);
  54.  
  55.     /* ICW2: IRQ 0 maps to INT IRQBASE */
  56.     outb(PIC_PIC0PORT2, IVT_IRQBASE);
  57.  
  58.     /* ICW3: pic1 using IRQ IRQ_PIC1 */
  59.     outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);
  60.  
  61.     /* ICW4: i8086 mode */
  62.     outb(PIC_PIC0PORT2, 1);
  63.  
  64.     /* ICW1: ICW1, ICW4 to follow */
  65.     outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
  66.  
  67.     /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
  68.     outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
  69.  
  70.     /* ICW3: pic1 is known as IRQ_PIC1 */
  71.     outb(PIC_PIC1PORT2, IRQ_PIC1);
  72.  
  73.     /* ICW4: i8086 mode */
  74.     outb(PIC_PIC1PORT2, 1);
  75.  
  76.     /*
  77.      * Register interrupt handler for the PIC spurious interrupt.
  78.      */
  79.     exc_register(VECTOR_PIC_SPUR, "pic_spurious", (iroutine) pic_spurious);
  80.  
  81.     /*
  82.      * Set the enable/disable IRQs handlers.
  83.      * Set the End-of-Interrupt handler.
  84.      */
  85.     enable_irqs_function = pic_enable_irqs;
  86.     disable_irqs_function = pic_disable_irqs;
  87.     eoi_function = pic_eoi;
  88.  
  89.     pic_disable_irqs(0xffff);       /* disable all irq's */
  90.     pic_enable_irqs(1<<IRQ_PIC1);       /* but enable pic1 */
  91. }
  92.  
  93. void pic_enable_irqs(__u16 irqmask)
  94. {
  95.     __u8 x;
  96.  
  97.     if (irqmask & 0xff) {
  98.         x = inb(PIC_PIC0PORT2);
  99.         outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));
  100.     }
  101.     if (irqmask >> 8) {
  102.         x = inb(PIC_PIC1PORT2);
  103.         outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));
  104.     }
  105. }
  106.  
  107. void pic_disable_irqs(__u16 irqmask)
  108. {
  109.     __u8 x;
  110.  
  111.     if (irqmask & 0xff) {
  112.         x = inb(PIC_PIC0PORT2);
  113.         outb(PIC_PIC0PORT2, x | (irqmask & 0xff));
  114.     }
  115.     if (irqmask >> 8) {
  116.         x = inb(PIC_PIC1PORT2);
  117.         outb(PIC_PIC1PORT2, x | (irqmask >> 8));
  118.     }
  119. }
  120.  
  121. void pic_eoi(void)
  122. {
  123.     outb(0x20,0x20);
  124.     outb(0xa0,0x20);
  125. }
  126.  
  127. void pic_spurious(int n, istate_t *istate)
  128. {
  129. #ifdef CONFIG_DEBUG
  130.     printf("cpu%d: PIC spurious interrupt\n", CPU->id);
  131. #endif
  132. }
  133.  
  134.  /** @}
  135.  */
  136.  
  137.