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Viewing changes to kern/i386/pit.c

  • Committer: Bazaar Package Importer
  • Author(s): Robert Millan
  • Date: 2009-07-02 13:23:51 UTC
  • mfrom: (1.1.10 upstream)
  • Revision ID: james.westby@ubuntu.com-20090702132351-tanpn0ryyijp93gu
Tags: 1.96+20090702-1
http://bugs.debian.org/535026
* New SVN snapshot.
* rules: Remove duplicated files in sparc64-ieee1275 port.
* rules: Comment out -DGRUB_ASSUME_LINUX_HAS_FB_SUPPORT=1 setting.  We'll
  re-evaluate using it when it's more mature.  (Closes: #535026).

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kern/i386/pit.c
 
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/*
 
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 *  GRUB  --  GRand Unified Bootloader
 
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 *  Copyright (C) 2008  Free Software Foundation, Inc.
 
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 *
 
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 *  GRUB is free software: you can redistribute it and/or modify
 
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 *  it under the terms of the GNU General Public License as published by
 
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 *  the Free Software Foundation, either version 3 of the License, or
 
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 *  (at your option) any later version.
 
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 *
 
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 *  GRUB is distributed in the hope that it will be useful,
 
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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 *  GNU General Public License for more details.
 
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 *
 
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 *  You should have received a copy of the GNU General Public License
 
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 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 
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 */
 
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#include <grub/types.h>
 
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#include <grub/i386/io.h>
 
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#include <grub/i386/pit.h>
 
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#define TIMER2_REG_CONTROL      0x42
 
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#define TIMER_REG_COMMAND       0x43
 
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#define TIMER2_REG_LATCH        0x61
 
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#define TIMER2_SELECT           0x80
 
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#define TIMER_ENABLE_LSB        0x20
 
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#define TIMER_ENABLE_MSB        0x10
 
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#define TIMER2_LATCH            0x20
 
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#define TIMER2_SPEAKER          0x02
 
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#define TIMER2_GATE             0x01
 
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void
 
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grub_pit_wait (grub_uint16_t tics)
 
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{
 
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  /* Disable timer2 gate and speaker.  */
 
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  grub_outb (grub_inb (TIMER2_REG_LATCH) & ~ (TIMER2_SPEAKER | TIMER2_GATE),
 
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             TIMER2_REG_LATCH);
 
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  /* Set tics.  */
 
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  grub_outb (TIMER2_SELECT | TIMER_ENABLE_LSB | TIMER_ENABLE_MSB, TIMER_REG_COMMAND);
 
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  grub_outb (tics & 0xff, TIMER2_REG_CONTROL);
 
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  grub_outb (tics >> 8, TIMER2_REG_CONTROL);
 
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  /* Enable timer2 gate, keep speaker disabled.  */
 
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  grub_outb ((grub_inb (TIMER2_REG_LATCH) & ~ TIMER2_SPEAKER) | TIMER2_GATE,
 
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             TIMER2_REG_LATCH);
 
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  /* Wait.  */
 
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  while ((grub_inb (TIMER2_REG_LATCH) & TIMER2_LATCH) == 0x00);
 
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  /* Disable timer2 gate and speaker.  */
 
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  grub_outb (grub_inb (TIMER2_REG_LATCH) & ~ (TIMER2_SPEAKER | TIMER2_GATE),
 
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             TIMER2_REG_LATCH);
 
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}