/* * This file is part of the coreboot project. * * Copyright 2012-2015 Google Inc. * * This program 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; version 2 of the License. * * This program 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. */ #include <arch/early_variables.h> #include <boot_device.h> #include <console/console.h> #include <fmap.h> #include <commonlib/fmap_serialized.h> #include <stddef.h> #include <string.h> #include "fmap_config.h" /* * See http://code.google.com/p/flashmap/ for more information on FMAP. */ static int fmap_print_once CAR_GLOBAL; int find_fmap_directory(struct region_device *fmrd) { const struct region_device *boot; struct fmap *fmap; size_t fmap_size; size_t offset = FMAP_OFFSET; boot_device_init(); boot = boot_device_ro(); if (boot == NULL) return -1; fmap_size = sizeof(struct fmap); fmap = rdev_mmap(boot, offset, fmap_size); if (fmap == NULL) return -1; if (memcmp(fmap->signature, FMAP_SIGNATURE, sizeof(fmap->signature))) { printk(BIOS_DEBUG, "No FMAP found at %zx offset.\n", offset); rdev_munmap(boot, fmap); return -1; } if (!car_get_var(fmap_print_once)) { printk(BIOS_DEBUG, "FMAP: Found \"%s\" version %d.%d at %zx.\n", fmap->name, fmap->ver_major, fmap->ver_minor, offset); printk(BIOS_DEBUG, "FMAP: base = %llx size = %x #areas = %d\n", (long long)fmap->base, fmap->size, fmap->nareas); car_set_var(fmap_print_once, 1); } fmap_size += fmap->nareas * sizeof(struct fmap_area); rdev_munmap(boot, fmap); return rdev_chain(fmrd, boot, offset, fmap_size); } int fmap_locate_area_as_rdev(const char *name, struct region_device *area) { struct region ar; if (fmap_locate_area(name, &ar)) return -1; return boot_device_ro_subregion(&ar, area); } int fmap_locate_area_as_rdev_rw(const char *name, struct region_device *area) { struct region ar; if (fmap_locate_area(name, &ar)) return -1; return boot_device_rw_subregion(&ar, area); } int fmap_locate_area(const char *name, struct region *ar) { struct region_device fmrd; size_t offset; if (find_fmap_directory(&fmrd)) return -1; /* Start reading the areas just after fmap header. */ offset = sizeof(struct fmap); while (1) { struct fmap_area *area; area = rdev_mmap(&fmrd, offset, sizeof(*area)); if (area == NULL) return -1; if (strcmp((const char *)area->name, name)) { rdev_munmap(&fmrd, area); offset += sizeof(struct fmap_area); continue; } printk(BIOS_DEBUG, "FMAP: area %s found @ %x (%d bytes)\n", name, area->offset, area->size); ar->offset = area->offset; ar->size = area->size; rdev_munmap(&fmrd, area); return 0; } printk(BIOS_DEBUG, "FMAP: area %s not found\n", name); return -1; } int fmap_find_region_name(const struct region * const ar, char name[FMAP_STRLEN]) { struct region_device fmrd; size_t offset; if (find_fmap_directory(&fmrd)) return -1; /* Start reading the areas just after fmap header. */ offset = sizeof(struct fmap); while (1) { struct fmap_area *area; area = rdev_mmap(&fmrd, offset, sizeof(*area)); if (area == NULL) return -1; if ((ar->offset != area->offset) || (ar->size != area->size)) { rdev_munmap(&fmrd, area); offset += sizeof(struct fmap_area); continue; } printk(BIOS_DEBUG, "FMAP: area (%zx, %zx) found, named %s\n", ar->offset, ar->size, area->name); memcpy(name, area->name, FMAP_STRLEN); rdev_munmap(&fmrd, area); return 0; } printk(BIOS_DEBUG, "FMAP: area (%zx, %zx) not found\n", ar->offset, ar->size); return -1; }