24371d2620
* 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.
163 lines
3.9 KiB
C
163 lines
3.9 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2004,2005,2006,2007,2008 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/kernel.h>
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#include <grub/mm.h>
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#include <grub/machine/time.h>
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#include <grub/machine/init.h>
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#include <grub/machine/memory.h>
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#include <grub/machine/console.h>
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#include <grub/machine/kernel.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/loader.h>
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#include <grub/env.h>
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#include <grub/cache.h>
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#include <grub/time.h>
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#include <grub/symbol.h>
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#include <grub/cpu/io.h>
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#define GRUB_FLOPPY_REG_DIGITAL_OUTPUT 0x3f2
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extern char _start[];
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extern char _end[];
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grub_addr_t grub_os_area_addr;
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grub_size_t grub_os_area_size;
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grub_size_t grub_lower_mem, grub_upper_mem;
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/* FIXME: we need interrupts to do this right */
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static grub_uint32_t grub_time_tics = 0;
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grub_uint32_t
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grub_get_rtc (void)
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{
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return grub_time_tics;
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}
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/* Stop the floppy drive from spinning, so that other software is
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jumped to with a known state. */
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void
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grub_stop_floppy (void)
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{
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grub_outb (0, GRUB_FLOPPY_REG_DIGITAL_OUTPUT);
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}
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void
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grub_exit (void)
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{
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grub_printf ("grub_exit() is not implemented.\n");
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grub_stop ();
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}
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void
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grub_arch_sync_caches (void *address __attribute__ ((unused)),
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grub_size_t len __attribute__ ((unused)))
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{
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}
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void
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grub_machine_init (void)
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{
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/* Initialize the console as early as possible. */
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grub_console_init ();
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grub_lower_mem = GRUB_MEMORY_MACHINE_LOWER_USABLE;
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grub_upper_mem = 0;
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auto int heap_init (mem_region_t);
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int heap_init (mem_region_t mem_region)
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{
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grub_uint64_t addr = mem_region->addr;
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grub_uint64_t size = mem_region->size;
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#if GRUB_CPU_SIZEOF_VOID_P == 4
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/* Restrict ourselves to 32-bit memory space. */
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if (addr > ULONG_MAX)
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{
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grub_upper_mem = ULONG_MAX;
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return 0;
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}
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if (addr + size > ULONG_MAX)
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size = ULONG_MAX - addr;
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#endif
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grub_upper_mem = grub_max (grub_upper_mem, addr + size);
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if (mem_region->type != GRUB_LINUXBIOS_MEMORY_AVAILABLE)
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return 0;
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/* Avoid the lower memory. */
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if (addr < GRUB_MEMORY_MACHINE_LOWER_SIZE)
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{
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if (addr + size <= GRUB_MEMORY_MACHINE_LOWER_SIZE)
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return 0;
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else
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{
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size -= GRUB_MEMORY_MACHINE_LOWER_SIZE - addr;
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addr = GRUB_MEMORY_MACHINE_LOWER_SIZE;
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}
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}
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if (addr == GRUB_MEMORY_MACHINE_UPPER_START
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|| (addr >= GRUB_MEMORY_MACHINE_LOWER_SIZE
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&& addr <= GRUB_MEMORY_MACHINE_UPPER_START
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&& (addr + size > GRUB_MEMORY_MACHINE_UPPER_START)))
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{
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grub_size_t quarter = size >> 2;
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grub_os_area_addr = addr;
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grub_os_area_size = size - quarter;
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grub_mm_init_region ((void *) (grub_os_area_addr + grub_os_area_size),
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quarter);
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}
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else
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grub_mm_init_region ((void *) (grub_addr_t) addr, (grub_size_t) size);
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return 0;
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}
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grub_available_iterate (heap_init);
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/* This variable indicates size, not offset. */
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grub_upper_mem -= GRUB_MEMORY_MACHINE_UPPER_START;
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grub_tsc_init ();
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}
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void
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grub_machine_set_prefix (void)
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{
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/* Initialize the prefix. */
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grub_env_set ("prefix", grub_prefix);
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}
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void
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grub_machine_fini (void)
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{
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grub_console_fini ();
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}
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/* Return the end of the core image. */
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grub_addr_t
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grub_arch_modules_addr (void)
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{
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return ALIGN_UP((grub_addr_t) _end, GRUB_MOD_ALIGN);
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}
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