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Diffstat (limited to 'payloads/libpayload/i386/coreboot.c')
| -rw-r--r-- | payloads/libpayload/i386/coreboot.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/payloads/libpayload/i386/coreboot.c b/payloads/libpayload/i386/coreboot.c new file mode 100644 index 0000000000..6d310d0325 --- /dev/null +++ b/payloads/libpayload/i386/coreboot.c @@ -0,0 +1,147 @@ +/* + * 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.h> +#include <sysinfo.h> +#include <ipchecksum.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; +} + +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(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((uint16_t *) header, sizeof(*header)) != 0) + return -1; + + if (ipchksum((uint16_t *) (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 will be interesting later + */ + + switch(rec->tag) { + case CB_TAG_MEMORY: + cb_parse_memory(ptr, info); + break; + + case CB_TAG_SERIAL: + cb_parse_serial(ptr, info); + break; + } + + 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((void *) 0x0, 0x1000, info); + + if (ret != 1) + ret = cb_parse_header((void *) 0xf0000, 0x1000, info); + + return (ret == 1) ? 0 : -1; +} |