250 lines
6 KiB
C
250 lines
6 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/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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struct mem_region
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{
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grub_addr_t addr;
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grub_size_t size;
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};
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#define MAX_REGIONS 32
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static struct mem_region mem_regions[MAX_REGIONS];
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static int num_regions;
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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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void
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grub_millisleep (grub_uint32_t ms)
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{
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grub_millisleep_generic (ms);
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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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static char *
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make_install_device (void)
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{
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/* XXX: This should be enough. */
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char dev[100];
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if (grub_install_dos_part != -2)
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{
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grub_sprintf (dev, "(%cd%u",
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(grub_boot_drive & 0x80) ? 'h' : 'f',
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grub_boot_drive & 0x7f);
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if (grub_install_dos_part >= 0)
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grub_sprintf (dev + grub_strlen (dev), ",%u", grub_install_dos_part + 1);
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if (grub_install_bsd_part >= 0)
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grub_sprintf (dev + grub_strlen (dev), ",%c", grub_install_bsd_part + 'a');
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grub_sprintf (dev + grub_strlen (dev), ")%s", grub_prefix);
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grub_strcpy (grub_prefix, dev);
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}
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return grub_prefix;
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}
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/* Add a memory region. */
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static void
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add_mem_region (grub_addr_t addr, grub_size_t size)
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{
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if (num_regions == MAX_REGIONS)
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/* Ignore. */
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return;
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mem_regions[num_regions].addr = addr;
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mem_regions[num_regions].size = size;
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num_regions++;
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}
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/* Compact memory regions. */
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static void
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compact_mem_regions (void)
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{
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int i, j;
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/* Sort them. */
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for (i = 0; i < num_regions - 1; i++)
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for (j = i + 1; j < num_regions; j++)
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if (mem_regions[i].addr > mem_regions[j].addr)
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{
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struct mem_region tmp = mem_regions[i];
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mem_regions[i] = mem_regions[j];
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mem_regions[j] = tmp;
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}
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/* Merge overlaps. */
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for (i = 0; i < num_regions - 1; i++)
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if (mem_regions[i].addr + mem_regions[i].size >= mem_regions[i + 1].addr)
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{
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j = i + 1;
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if (mem_regions[i].addr + mem_regions[i].size
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< mem_regions[j].addr + mem_regions[j].size)
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mem_regions[i].size = (mem_regions[j].addr + mem_regions[j].size
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- mem_regions[i].addr);
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grub_memmove (mem_regions + j, mem_regions + j + 1,
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(num_regions - j - 1) * sizeof (struct mem_region));
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i--;
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num_regions--;
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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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grub_uint32_t cont;
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struct grub_machine_mmap_entry *entry
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= (struct grub_machine_mmap_entry *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
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int i;
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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_get_memsize (0) << 10;
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/* Sanity check. */
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if (grub_lower_mem < GRUB_MEMORY_MACHINE_RESERVED_END)
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grub_fatal ("too small memory");
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#if 0
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/* Turn on Gate A20 to access >1MB. */
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grub_gate_a20 (1);
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#endif
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/* Add the lower memory into free memory. */
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if (grub_lower_mem >= GRUB_MEMORY_MACHINE_RESERVED_END)
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add_mem_region (GRUB_MEMORY_MACHINE_RESERVED_END,
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grub_lower_mem - GRUB_MEMORY_MACHINE_RESERVED_END);
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/* Check if grub_get_mmap_entry works. */
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cont = grub_get_mmap_entry (entry, 0);
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if (entry->size)
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do
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{
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/* Avoid the lower memory. */
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if (entry->addr < 0x100000)
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{
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if (entry->len <= 0x100000 - entry->addr)
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goto next;
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entry->len -= 0x100000 - entry->addr;
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entry->addr = 0x100000;
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}
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/* Ignore >4GB. */
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if (entry->addr <= 0xFFFFFFFF && entry->type == 1)
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{
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grub_addr_t addr;
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grub_size_t len;
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addr = (grub_addr_t) entry->addr;
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len = ((addr + entry->len > 0xFFFFFFFF)
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? 0xFFFFFFFF - addr
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: (grub_size_t) entry->len);
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add_mem_region (addr, len);
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}
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next:
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if (! cont)
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break;
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cont = grub_get_mmap_entry (entry, cont);
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}
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while (entry->size);
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else
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{
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grub_uint32_t eisa_mmap = grub_get_eisa_mmap ();
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if (eisa_mmap)
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{
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add_mem_region (0x100000, (eisa_mmap & 0xFFFF) << 10);
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add_mem_region (0x1000000, eisa_mmap & ~0xFFFF);
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}
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else
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add_mem_region (0x100000, grub_get_memsize (1) << 10);
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}
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compact_mem_regions ();
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/* Add the memory regions to free memory, except for the region starting
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from 1MB. This region is partially used for loading OS images.
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For now, 1/4 of this is added to free memory. */
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for (i = 0; i < num_regions; i++)
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if (mem_regions[i].addr == 0x100000)
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{
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grub_size_t quarter = mem_regions[i].size >> 2;
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grub_upper_mem = mem_regions[i].size;
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grub_os_area_addr = mem_regions[i].addr;
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grub_os_area_size = mem_regions[i].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 *) mem_regions[i].addr, mem_regions[i].size);
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if (! grub_os_area_addr)
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grub_fatal ("no upper memory");
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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", make_install_device ());
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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 grub_end_addr;
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}
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