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2008-08-05 Robert Millan <rmh@aybabtu.com>

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* conf/i386-pc.rmk (kernel_img_SOURCES): Add `kern/i386/pit.c'.
        * conf/i386-efi.rmk (kernel_mod_SOURCES): Likewise.
        * conf/i386-coreboot.rmk (kernel_elf_SOURCES): Likewise. Also add
        `kern/i386/tsc.c', `kern/generic/rtc_get_time_ms.c' and
        `kern/generic/millisleep.c'.

        * kern/i386/tsc.c (calibrate_tsc): Rewrite using grub_pit_wait()
        instead of grub_get_rtc().
        (grub_tsc_init): Initialize `tsc_boot_time'.

        * kern/i386/linuxbios/init.c (grub_millisleep): Remove stub.
        (grub_machine_init): Use grub_tsc_init() rather than
        installing an RTC-based handler via grub_install_get_time_ms().

        * kern/i386/pit.c: New file.
        * include/grub/i386/pit.h: Likewise.
This commit is contained in:
robertmh 2008-08-05 20:24:00 +00:00
parent 9e7007b310
commit 24371d2620
9 changed files with 90 additions and 42 deletions
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39
kern/i386/pit.c Normal file
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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/types.h>
#include <grub/cpu/io.h>
#define TIMER2_REG_CONTROL 0x42
#define TIMER_REG_COMMAND 0x43
#define TIMER2_REG_LATCH 0x61
#define TIMER2_SELECT 0x80
#define TIMER_ENABLE_LSB 0x20
#define TIMER_ENABLE_MSB 0x10
#define TIMER2_LATCH 0x20
void
grub_pit_wait (grub_uint16_t tics)
{
grub_outb (TIMER2_SELECT | TIMER_ENABLE_LSB | TIMER_ENABLE_MSB, TIMER_REG_COMMAND);
grub_outb (tics & 0xff, TIMER2_REG_CONTROL);
grub_outb (tics >> 8, TIMER2_REG_CONTROL);
while ((grub_inb (TIMER2_REG_LATCH) & TIMER2_LATCH) == 0x00);
}