/* * This file is part of the libpayload project. * * Copyright (C) 2013 Google, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #define LIBPAYLOAD #include <cbfs.h> #include <string.h> #ifdef LIBPAYLOAD # define printk(x...) # define init_default_cbfs_media libpayload_init_default_cbfs_media extern int libpayload_init_default_cbfs_media(struct cbfs_media *media); #else # include <console/console.h> #endif // Implementation of memory-mapped ROM media source on X86. static int x86_rom_open(struct cbfs_media *media) { return 0; } static void *x86_rom_map(struct cbfs_media *media, size_t offset, size_t count) { void *ptr; // Some address (ex, pointer to master header) may be given in memory // mapped location. To workaround that, we handle >0xf0000000 as real // memory pointer. if ((uint32_t)offset > (uint32_t)0xf0000000) ptr = (void*)offset; else ptr = (void*)(0 - (uint32_t)media->context + offset); return ptr; } static void *x86_rom_unmap(struct cbfs_media *media, const void *address) { return NULL; } static size_t x86_rom_read(struct cbfs_media *media, void *dest, size_t offset, size_t count) { void *ptr = x86_rom_map(media, offset, count); memcpy(dest, ptr, count); x86_rom_unmap(media, ptr); return count; } static int x86_rom_close(struct cbfs_media *media) { return 0; } int init_x86rom_cbfs_media(struct cbfs_media *media); int init_x86rom_cbfs_media(struct cbfs_media *media) { // On X86, we always keep a reference of pointer to CBFS header in // 0xfffffffc, and the pointer is still a memory-mapped address. // Since the CBFS core always use ROM offset, we need to figure out // header->romsize even before media is initialized. struct cbfs_header *header = (struct cbfs_header*) *(uint32_t*)(0xfffffffc); if (CBFS_HEADER_MAGIC != ntohl(header->magic)) { #if IS_ENABLED(CONFIG_LP_ROM_SIZE) printk(BIOS_ERR, "Invalid CBFS master header at %p\n", header); media->context = (void*)CONFIG_LP_ROM_SIZE; #else return -1; #endif } else { uint32_t romsize = ntohl(header->romsize); media->context = (void*)romsize; #if IS_ENABLED(CONFIG_LP_ROM_SIZE) if (CONFIG_LP_ROM_SIZE != romsize) printk(BIOS_INFO, "Warning: rom size unmatch (%d/%d)\n", CONFIG_LP_ROM_SIZE, romsize); #endif } media->open = x86_rom_open; media->close = x86_rom_close; media->map = x86_rom_map; media->unmap = x86_rom_unmap; media->read = x86_rom_read; return 0; } int init_default_cbfs_media(struct cbfs_media *media) { return init_x86rom_cbfs_media(media); }