diff options
Diffstat (limited to 'grub-core/kern/i386/coreboot/mmap.c')
-rw-r--r-- | grub-core/kern/i386/coreboot/mmap.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/grub-core/kern/i386/coreboot/mmap.c b/grub-core/kern/i386/coreboot/mmap.c new file mode 100644 index 0000000..8b0b202 --- /dev/null +++ b/grub-core/kern/i386/coreboot/mmap.c @@ -0,0 +1,108 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2007,2008 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/machine/memory.h> +#include <grub/machine/lbio.h> +#include <grub/types.h> +#include <grub/err.h> +#include <grub/misc.h> + +static grub_err_t +grub_linuxbios_table_iterate (int (*hook) (grub_linuxbios_table_item_t)) +{ + grub_linuxbios_table_header_t table_header; + grub_linuxbios_table_item_t table_item; + + auto int check_signature (grub_linuxbios_table_header_t); + int check_signature (grub_linuxbios_table_header_t tbl_header) + { + if (! grub_memcmp (tbl_header->signature, "LBIO", 4)) + return 1; + + return 0; + } + + /* Assuming table_header is aligned to its size (8 bytes). */ + + for (table_header = (grub_linuxbios_table_header_t) 0x500; + table_header < (grub_linuxbios_table_header_t) 0x1000; table_header++) + if (check_signature (table_header)) + goto signature_found; + + for (table_header = (grub_linuxbios_table_header_t) 0xf0000; + table_header < (grub_linuxbios_table_header_t) 0x100000; table_header++) + if (check_signature (table_header)) + goto signature_found; + + grub_fatal ("Could not find coreboot table\n"); + +signature_found: + + table_item = + (grub_linuxbios_table_item_t) ((long) table_header + + (long) table_header->size); + for (; table_item->size; + table_item = (grub_linuxbios_table_item_t) ((long) table_item + (long) table_item->size)) + { + if (table_item->tag == GRUB_LINUXBIOS_MEMBER_LINK + && check_signature ((grub_linuxbios_table_header_t) (grub_addr_t) + *(grub_uint64_t *) (table_item + 1))) + { + table_header = (grub_linuxbios_table_header_t) (grub_addr_t) + *(grub_uint64_t *) (table_item + 1); + goto signature_found; + } + if (hook (table_item)) + return 1; + } + + return 0; +} + +grub_err_t +grub_machine_mmap_iterate (grub_memory_hook_t hook) +{ + mem_region_t mem_region; + + auto int iterate_linuxbios_table (grub_linuxbios_table_item_t); + int iterate_linuxbios_table (grub_linuxbios_table_item_t table_item) + { + if (table_item->tag != GRUB_LINUXBIOS_MEMBER_MEMORY) + return 0; + + mem_region = + (mem_region_t) ((long) table_item + + sizeof (struct grub_linuxbios_table_item)); + while ((long) mem_region < (long) table_item + (long) table_item->size) + { + if (hook (mem_region->addr, mem_region->size, + /* Multiboot mmaps match with the coreboot mmap definition. + Therefore, we can just pass type through. */ + mem_region->type)) + return 1; + + mem_region++; + } + + return 0; + } + + grub_linuxbios_table_iterate (iterate_linuxbios_table); + + return 0; +} |