125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 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/machine/memory.h>
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#include <grub/machine/lbio.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/misc.h>
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/* Helper for grub_linuxbios_table_iterate. */
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static int
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check_signature (grub_linuxbios_table_header_t tbl_header)
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{
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if (! grub_memcmp (tbl_header->signature, "LBIO", 4))
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return 1;
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return 0;
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}
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grub_err_t
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grub_linuxbios_table_iterate (int (*hook) (grub_linuxbios_table_item_t,
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void *),
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void *hook_data)
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{
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grub_linuxbios_table_header_t table_header;
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grub_linuxbios_table_item_t table_item;
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/* Assuming table_header is aligned to its size (8 bytes). */
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for (table_header = (grub_linuxbios_table_header_t) 0x500;
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table_header < (grub_linuxbios_table_header_t) 0x1000; table_header++)
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if (check_signature (table_header))
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goto signature_found;
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for (table_header = (grub_linuxbios_table_header_t) 0xf0000;
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table_header < (grub_linuxbios_table_header_t) 0x100000; table_header++)
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if (check_signature (table_header))
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goto signature_found;
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grub_fatal ("Could not find coreboot table\n");
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signature_found:
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table_item =
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(grub_linuxbios_table_item_t) ((long) table_header +
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(long) table_header->header_size);
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for (; table_item < (grub_linuxbios_table_item_t) ((long) table_header
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+ (long) table_header->header_size
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+ (long) table_header->table_size);
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table_item = (grub_linuxbios_table_item_t) ((long) table_item + (long) table_item->size))
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{
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if (table_item->tag == GRUB_LINUXBIOS_MEMBER_LINK
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&& check_signature ((grub_linuxbios_table_header_t) (grub_addr_t)
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*(grub_uint64_t *) (table_item + 1)))
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{
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table_header = (grub_linuxbios_table_header_t) (grub_addr_t)
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*(grub_uint64_t *) (table_item + 1);
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goto signature_found;
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}
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if (hook (table_item, hook_data))
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return 1;
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}
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return 0;
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}
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/* Context for grub_machine_mmap_iterate. */
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struct grub_machine_mmap_iterate_ctx
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{
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grub_memory_hook_t hook;
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void *hook_data;
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};
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/* Helper for grub_machine_mmap_iterate. */
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static int
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iterate_linuxbios_table (grub_linuxbios_table_item_t table_item, void *data)
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{
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struct grub_machine_mmap_iterate_ctx *ctx = data;
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mem_region_t mem_region;
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if (table_item->tag != GRUB_LINUXBIOS_MEMBER_MEMORY)
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return 0;
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mem_region =
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(mem_region_t) ((long) table_item +
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sizeof (struct grub_linuxbios_table_item));
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while ((long) mem_region < (long) table_item + (long) table_item->size)
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{
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if (ctx->hook (mem_region->addr, mem_region->size,
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/* Multiboot mmaps match with the coreboot mmap
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definition. Therefore, we can just pass type
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through. */
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mem_region->type, ctx->hook_data))
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return 1;
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mem_region++;
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}
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return 0;
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}
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grub_err_t
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grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
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{
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struct grub_machine_mmap_iterate_ctx ctx = { hook, hook_data };
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grub_linuxbios_table_iterate (iterate_linuxbios_table, &ctx);
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return 0;
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}
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