151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009 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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#include <grub/cpu/kernel.h>
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#include <grub/cpu/tsc.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_uint32_t
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grub_get_rtc (void)
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{
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grub_fatal ("grub_get_rtc() is not implemented.\n");
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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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/* We can't use grub_fatal() in this function. This would create an infinite
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loop, since grub_fatal() calls grub_abort() which in turn calls grub_exit(). */
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while (1)
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grub_cpu_idle ();
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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_vga_text_init ();
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auto int NESTED_FUNC_ATTR heap_init (grub_uint64_t, grub_uint64_t, grub_uint32_t);
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int NESTED_FUNC_ATTR heap_init (grub_uint64_t addr, grub_uint64_t size, grub_uint32_t type)
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{
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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 > GRUB_ULONG_MAX)
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return 0;
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if (addr + size > GRUB_ULONG_MAX)
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size = GRUB_ULONG_MAX - addr;
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#endif
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if (type != GRUB_MACHINE_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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#if defined (GRUB_MACHINE_MULTIBOOT) || defined (GRUB_MACHINE_QEMU)
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grub_machine_mmap_init ();
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#endif
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grub_machine_mmap_iterate (heap_init);
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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_vga_text_fini ();
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grub_stop_floppy ();
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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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#ifdef GRUB_MACHINE_QEMU
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return grub_core_entry_addr + grub_kernel_image_size;
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#else
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return ALIGN_UP((grub_addr_t) _end, GRUB_MOD_ALIGN);
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#endif
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}
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