| /* |
| * This file is part of the libpayload project. |
| * |
| * Copyright (C) 2008 Advanced Micro Devices, 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. |
| */ |
| |
| #include <libpayload-config.h> |
| #include <libpayload.h> |
| #include <coreboot_tables.h> |
| |
| /* |
| * Some of this is x86 specific, and the rest of it is generic. Right now, |
| * since we only support x86, we'll avoid trying to make lots of infrastructure |
| * we don't need. If in the future, we want to use coreboot on some other |
| * architecture, then take out the generic parsing code and move it elsewhere. |
| */ |
| |
| /* === Parsing code === */ |
| /* This is the generic parsing code. */ |
| |
| static void cb_parse_memory(unsigned char *ptr, struct sysinfo_t *info) |
| { |
| struct cb_memory *mem = (struct cb_memory *)ptr; |
| int count = MEM_RANGE_COUNT(mem); |
| int i; |
| |
| if (count > SYSINFO_MAX_MEM_RANGES) |
| count = SYSINFO_MAX_MEM_RANGES; |
| |
| info->n_memranges = 0; |
| |
| for (i = 0; i < count; i++) { |
| struct cb_memory_range *range = |
| (struct cb_memory_range *)MEM_RANGE_PTR(mem, i); |
| |
| if (range->type != CB_MEM_RAM) |
| continue; |
| |
| info->memrange[info->n_memranges].base = |
| UNPACK_CB64(range->start); |
| |
| info->memrange[info->n_memranges].size = |
| UNPACK_CB64(range->size); |
| |
| info->n_memranges++; |
| } |
| } |
| |
| static void cb_parse_serial(unsigned char *ptr, struct sysinfo_t *info) |
| { |
| struct cb_serial *ser = (struct cb_serial *)ptr; |
| info->ser_ioport = ser->ioport; |
| } |
| |
| #ifdef CONFIG_NVRAM |
| static void cb_parse_optiontable(unsigned char *ptr, struct sysinfo_t *info) |
| { |
| info->option_table = (struct cb_cmos_option_table *)ptr; |
| } |
| |
| static void cb_parse_checksum(unsigned char *ptr, struct sysinfo_t *info) |
| { |
| struct cb_cmos_checksum *cmos_cksum = (struct cb_cmos_checksum *)ptr; |
| info->cmos_range_start = cmos_cksum->range_start; |
| info->cmos_range_end = cmos_cksum->range_end; |
| info->cmos_checksum_location = cmos_cksum->location; |
| } |
| #endif |
| |
| static int cb_parse_header(void *addr, int len, struct sysinfo_t *info) |
| { |
| struct cb_header *header; |
| unsigned char *ptr = (unsigned char *)addr; |
| int i; |
| |
| for (i = 0; i < len; i += 16, ptr += 16) { |
| header = (struct cb_header *)ptr; |
| if (!strncmp((const char *)header->signature, "LBIO", 4)) |
| break; |
| } |
| |
| /* We walked the entire space and didn't find anything. */ |
| if (i >= len) |
| return -1; |
| |
| if (!header->table_bytes) |
| return 0; |
| |
| /* Make sure the checksums match. */ |
| if (ipchksum((u16 *) header, sizeof(*header)) != 0) |
| return -1; |
| |
| if (ipchksum((u16 *) (ptr + sizeof(*header)), |
| header->table_bytes) != header->table_checksum) |
| return -1; |
| |
| /* Now, walk the tables. */ |
| ptr += header->header_bytes; |
| |
| for (i = 0; i < header->table_entries; i++) { |
| struct cb_record *rec = (struct cb_record *)ptr; |
| |
| /* We only care about a few tags here (maybe more later). */ |
| switch (rec->tag) { |
| case CB_TAG_MEMORY: |
| cb_parse_memory(ptr, info); |
| break; |
| case CB_TAG_SERIAL: |
| cb_parse_serial(ptr, info); |
| break; |
| #ifdef CONFIG_NVRAM |
| case CB_TAG_CMOS_OPTION_TABLE: |
| cb_parse_optiontable(ptr, info); |
| break; |
| case CB_TAG_OPTION_CHECKSUM: |
| cb_parse_checksum(ptr, info); |
| break; |
| #endif |
| } |
| |
| ptr += rec->size; |
| } |
| |
| return 1; |
| } |
| |
| /* == Architecture specific == */ |
| /* This is the x86 specific stuff. */ |
| |
| int get_coreboot_info(struct sysinfo_t *info) |
| { |
| int ret = cb_parse_header(phys_to_virt(0x00000000), 0x1000, info); |
| |
| if (ret != 1) |
| ret = cb_parse_header(phys_to_virt(0x000f0000), 0x1000, info); |
| |
| return (ret == 1) ? 0 : -1; |
| } |