| // Coreboot interface support. |
| // |
| // Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net> |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| |
| #include "memmap.h" // add_e820 |
| #include "util.h" // dprintf |
| #include "biosvar.h" // GET_EBDA |
| #include "lzmadecode.h" // LzmaDecode |
| #include "smbios.h" // smbios_init |
| #include "boot.h" // boot_add_cbfs |
| |
| |
| /**************************************************************** |
| * Memory map |
| ****************************************************************/ |
| |
| struct cb_header { |
| u32 signature; |
| u32 header_bytes; |
| u32 header_checksum; |
| u32 table_bytes; |
| u32 table_checksum; |
| u32 table_entries; |
| }; |
| |
| #define CB_SIGNATURE 0x4f49424C // "LBIO" |
| |
| struct cb_memory_range { |
| u64 start; |
| u64 size; |
| u32 type; |
| }; |
| |
| #define CB_MEM_TABLE 16 |
| |
| struct cb_memory { |
| u32 tag; |
| u32 size; |
| struct cb_memory_range map[0]; |
| }; |
| |
| #define CB_TAG_MEMORY 0x01 |
| |
| #define MEM_RANGE_COUNT(_rec) \ |
| (((_rec)->size - sizeof(*(_rec))) / sizeof((_rec)->map[0])) |
| |
| struct cb_mainboard { |
| u32 tag; |
| u32 size; |
| u8 vendor_idx; |
| u8 part_idx; |
| char strings[0]; |
| }; |
| |
| #define CB_TAG_MAINBOARD 0x0003 |
| |
| struct cb_forward { |
| u32 tag; |
| u32 size; |
| u64 forward; |
| }; |
| |
| #define CB_TAG_FORWARD 0x11 |
| |
| static u16 |
| ipchksum(char *buf, int count) |
| { |
| u16 *p = (u16*)buf; |
| u32 sum = 0; |
| while (count > 1) { |
| sum += *p++; |
| count -= 2; |
| } |
| if (count) |
| sum += *(u8*)p; |
| sum = (sum >> 16) + (sum & 0xffff); |
| sum += (sum >> 16); |
| return ~sum; |
| } |
| |
| // Try to locate the coreboot header in a given address range. |
| static struct cb_header * |
| find_cb_header(char *addr, int len) |
| { |
| char *end = addr + len; |
| for (; addr < end; addr += 16) { |
| struct cb_header *cbh = (struct cb_header *)addr; |
| if (cbh->signature != CB_SIGNATURE) |
| continue; |
| if (! cbh->table_bytes) |
| continue; |
| if (ipchksum(addr, sizeof(*cbh)) != 0) |
| continue; |
| if (ipchksum(addr + sizeof(*cbh), cbh->table_bytes) |
| != cbh->table_checksum) |
| continue; |
| return cbh; |
| } |
| return NULL; |
| } |
| |
| // Try to find the coreboot memory table in the given coreboot table. |
| static void * |
| find_cb_subtable(struct cb_header *cbh, u32 tag) |
| { |
| char *tbl = (char *)cbh + sizeof(*cbh); |
| int i; |
| for (i=0; i<cbh->table_entries; i++) { |
| struct cb_memory *cbm = (struct cb_memory *)tbl; |
| tbl += cbm->size; |
| if (cbm->tag == tag) |
| return cbm; |
| } |
| return NULL; |
| } |
| |
| static struct cb_memory *CBMemTable; |
| const char *CBvendor, *CBpart; |
| |
| // Populate max ram and e820 map info by scanning for a coreboot table. |
| static void |
| coreboot_fill_map(void) |
| { |
| dprintf(3, "Attempting to find coreboot table\n"); |
| |
| // Find coreboot table. |
| struct cb_header *cbh = find_cb_header(0, 0x1000); |
| if (!cbh) |
| goto fail; |
| struct cb_forward *cbf = find_cb_subtable(cbh, CB_TAG_FORWARD); |
| if (cbf) { |
| dprintf(3, "Found coreboot table forwarder.\n"); |
| cbh = find_cb_header((char *)((u32)cbf->forward), 0x100); |
| if (!cbh) |
| goto fail; |
| } |
| dprintf(3, "Now attempting to find coreboot memory map\n"); |
| struct cb_memory *cbm = CBMemTable = find_cb_subtable(cbh, CB_TAG_MEMORY); |
| if (!cbm) |
| goto fail; |
| |
| u64 maxram = 0, maxram_over4G = 0; |
| int i, count = MEM_RANGE_COUNT(cbm); |
| for (i=0; i<count; i++) { |
| struct cb_memory_range *m = &cbm->map[i]; |
| u32 type = m->type; |
| if (type == CB_MEM_TABLE) { |
| type = E820_RESERVED; |
| } else if (type == E820_ACPI || type == E820_RAM) { |
| u64 end = m->start + m->size; |
| if (end > 0x100000000ull) { |
| end -= 0x100000000ull; |
| if (end > maxram_over4G) |
| maxram_over4G = end; |
| } else if (end > maxram) |
| maxram = end; |
| } |
| add_e820(m->start, m->size, type); |
| } |
| |
| RamSize = maxram; |
| RamSizeOver4G = maxram_over4G; |
| |
| // Ughh - coreboot likes to set a map at 0x0000-0x1000, but this |
| // confuses grub. So, override it. |
| add_e820(0, 16*1024, E820_RAM); |
| |
| struct cb_mainboard *cbmb = find_cb_subtable(cbh, CB_TAG_MAINBOARD); |
| if (cbmb) { |
| CBvendor = &cbmb->strings[cbmb->vendor_idx]; |
| CBpart = &cbmb->strings[cbmb->part_idx]; |
| dprintf(1, "Found mainboard %s %s\n", CBvendor, CBpart); |
| } |
| |
| return; |
| |
| fail: |
| // No table found.. Use 16Megs as a dummy value. |
| dprintf(1, "Unable to find coreboot table!\n"); |
| RamSize = 16*1024*1024; |
| RamSizeOver4G = 0; |
| add_e820(0, 16*1024*1024, E820_RAM); |
| return; |
| } |
| |
| |
| /**************************************************************** |
| * BIOS table copying |
| ****************************************************************/ |
| |
| // Attempt to find (and relocate) any standard bios tables found in a |
| // given address range. |
| static void |
| scan_tables(u32 start, u32 size) |
| { |
| void *p = (void*)ALIGN(start, 16); |
| void *end = (void*)start + size; |
| for (; p<end; p += 16) { |
| copy_pir(p); |
| copy_mptable(p); |
| copy_acpi_rsdp(p); |
| copy_smbios(p); |
| } |
| } |
| |
| void |
| coreboot_copy_biostable(void) |
| { |
| struct cb_memory *cbm = CBMemTable; |
| if (! CONFIG_COREBOOT || !cbm) |
| return; |
| |
| dprintf(3, "Relocating coreboot bios tables\n"); |
| |
| // Scan CB_MEM_TABLE areas for bios tables. |
| int i, count = MEM_RANGE_COUNT(cbm); |
| for (i=0; i<count; i++) { |
| struct cb_memory_range *m = &cbm->map[i]; |
| if (m->type == CB_MEM_TABLE) |
| scan_tables(m->start, m->size); |
| } |
| |
| // XXX - create a dummy smbios table for now. |
| if (!SMBiosAddr) |
| smbios_init(); |
| } |
| |
| |
| /**************************************************************** |
| * ulzma |
| ****************************************************************/ |
| |
| // Uncompress data in flash to an area of memory. |
| static int |
| ulzma(u8 *dst, u32 maxlen, const u8 *src, u32 srclen) |
| { |
| dprintf(3, "Uncompressing data %d@%p to %d@%p\n", srclen, src, maxlen, dst); |
| CLzmaDecoderState state; |
| int ret = LzmaDecodeProperties(&state.Properties, src, LZMA_PROPERTIES_SIZE); |
| if (ret != LZMA_RESULT_OK) { |
| dprintf(1, "LzmaDecodeProperties error - %d\n", ret); |
| return -1; |
| } |
| u8 scratch[15980]; |
| int need = (LzmaGetNumProbs(&state.Properties) * sizeof(CProb)); |
| if (need > sizeof(scratch)) { |
| dprintf(1, "LzmaDecode need %d have %d\n", need, (unsigned int)sizeof(scratch)); |
| return -1; |
| } |
| state.Probs = (CProb *)scratch; |
| |
| u32 dstlen = *(u32*)(src + LZMA_PROPERTIES_SIZE); |
| if (dstlen > maxlen) { |
| dprintf(1, "LzmaDecode too large (max %d need %d)\n", maxlen, dstlen); |
| return -1; |
| } |
| u32 inProcessed, outProcessed; |
| ret = LzmaDecode(&state, src + LZMA_PROPERTIES_SIZE + 8, srclen |
| , &inProcessed, dst, dstlen, &outProcessed); |
| if (ret) { |
| dprintf(1, "LzmaDecode returned %d\n", ret); |
| return -1; |
| } |
| return dstlen; |
| } |
| |
| |
| /**************************************************************** |
| * Coreboot flash format |
| ****************************************************************/ |
| |
| #define CBFS_HEADER_MAGIC 0x4F524243 |
| #define CBFS_HEADPTR_ADDR 0xFFFFFFFc |
| #define CBFS_VERSION1 0x31313131 |
| |
| struct cbfs_header { |
| u32 magic; |
| u32 version; |
| u32 romsize; |
| u32 bootblocksize; |
| u32 align; |
| u32 offset; |
| u32 pad[2]; |
| } PACKED; |
| |
| static struct cbfs_header *CBHDR; |
| |
| static void |
| cbfs_setup(void) |
| { |
| if (!CONFIG_COREBOOT || !CONFIG_COREBOOT_FLASH) |
| return; |
| |
| CBHDR = *(void **)CBFS_HEADPTR_ADDR; |
| if (CBHDR->magic != htonl(CBFS_HEADER_MAGIC)) { |
| dprintf(1, "Unable to find CBFS (ptr=%p; got %x not %x)\n" |
| , CBHDR, CBHDR->magic, htonl(CBFS_HEADER_MAGIC)); |
| CBHDR = NULL; |
| return; |
| } |
| |
| dprintf(1, "Found CBFS header at %p\n", CBHDR); |
| } |
| |
| #define CBFS_FILE_MAGIC 0x455649484352414cLL // LARCHIVE |
| |
| struct cbfs_file { |
| u64 magic; |
| u32 len; |
| u32 type; |
| u32 checksum; |
| u32 offset; |
| char filename[0]; |
| } PACKED; |
| |
| // Verify a cbfs entry looks valid. |
| static struct cbfs_file * |
| cbfs_verify(struct cbfs_file *file) |
| { |
| if (file < (struct cbfs_file *)(0xFFFFFFFF - ntohl(CBHDR->romsize))) |
| return NULL; |
| u64 magic = file->magic; |
| if (magic == CBFS_FILE_MAGIC) { |
| dprintf(5, "Found CBFS file %s\n", file->filename); |
| return file; |
| } |
| return NULL; |
| } |
| |
| // Return the first file in the CBFS archive |
| static struct cbfs_file * |
| cbfs_getfirst(void) |
| { |
| if (! CBHDR) |
| return NULL; |
| return cbfs_verify((void *)(0 - ntohl(CBHDR->romsize) + ntohl(CBHDR->offset))); |
| } |
| |
| // Return the file after the given file. |
| static struct cbfs_file * |
| cbfs_getnext(struct cbfs_file *file) |
| { |
| file = (void*)file + ALIGN(ntohl(file->len) + ntohl(file->offset), ntohl(CBHDR->align)); |
| return cbfs_verify(file); |
| } |
| |
| // Find the file with the given filename. |
| struct cbfs_file * |
| cbfs_findfile(const char *fname) |
| { |
| dprintf(3, "Searching CBFS for %s\n", fname); |
| struct cbfs_file *file; |
| for (file = cbfs_getfirst(); file; file = cbfs_getnext(file)) |
| if (strcmp(fname, file->filename) == 0) |
| return file; |
| return NULL; |
| } |
| |
| // Find next file with the given filename prefix. |
| struct cbfs_file * |
| cbfs_findprefix(const char *prefix, struct cbfs_file *last) |
| { |
| if (!CONFIG_COREBOOT || !CONFIG_COREBOOT_FLASH) |
| return NULL; |
| |
| dprintf(3, "Searching CBFS for prefix %s\n", prefix); |
| int len = strlen(prefix); |
| struct cbfs_file *file; |
| if (! last) |
| file = cbfs_getfirst(); |
| else |
| file = cbfs_getnext(last); |
| for (; file; file = cbfs_getnext(file)) |
| if (memcmp(prefix, file->filename, len) == 0) |
| return file; |
| return NULL; |
| } |
| |
| // Find a file with the given filename (possibly with ".lzma" extension). |
| struct cbfs_file * |
| cbfs_finddatafile(const char *fname) |
| { |
| int fnlen = strlen(fname); |
| struct cbfs_file *file = NULL; |
| for (;;) { |
| file = cbfs_findprefix(fname, file); |
| if (!file) |
| return NULL; |
| if (file->filename[fnlen] == '\0' |
| || strcmp(&file->filename[fnlen], ".lzma") == 0) |
| return file; |
| } |
| } |
| |
| // Determine whether the file has a ".lzma" extension. |
| static int |
| cbfs_iscomp(struct cbfs_file *file) |
| { |
| int fnamelen = strlen(file->filename); |
| return fnamelen > 5 && strcmp(&file->filename[fnamelen-5], ".lzma") == 0; |
| } |
| |
| // Return the filename of a given file. |
| const char * |
| cbfs_filename(struct cbfs_file *file) |
| { |
| return file->filename; |
| } |
| |
| // Determine the uncompressed size of a datafile. |
| u32 |
| cbfs_datasize(struct cbfs_file *file) |
| { |
| void *src = (void*)file + ntohl(file->offset); |
| if (cbfs_iscomp(file)) |
| return *(u32*)(src + LZMA_PROPERTIES_SIZE); |
| return ntohl(file->len); |
| } |
| |
| // Copy a file to memory (uncompressing if necessary) |
| int |
| cbfs_copyfile(struct cbfs_file *file, void *dst, u32 maxlen) |
| { |
| if (!CONFIG_COREBOOT || !CONFIG_COREBOOT_FLASH || !file) |
| return -1; |
| |
| u32 size = ntohl(file->len); |
| void *src = (void*)file + ntohl(file->offset); |
| if (cbfs_iscomp(file)) { |
| // Compressed - copy to temp ram and uncompress it. |
| void *temp = malloc_tmphigh(size); |
| if (!temp) |
| return -1; |
| iomemcpy(temp, src, size); |
| int ret = ulzma(dst, maxlen, temp, size); |
| yield(); |
| free(temp); |
| return ret; |
| } |
| |
| // Not compressed. |
| dprintf(3, "Copying data %d@%p to %d@%p\n", size, src, maxlen, dst); |
| if (size > maxlen) { |
| warn_noalloc(); |
| return -1; |
| } |
| iomemcpy(dst, src, size); |
| return size; |
| } |
| |
| struct cbfs_payload_segment { |
| u32 type; |
| u32 compression; |
| u32 offset; |
| u64 load_addr; |
| u32 len; |
| u32 mem_len; |
| } PACKED; |
| |
| #define PAYLOAD_SEGMENT_BSS 0x20535342 |
| #define PAYLOAD_SEGMENT_ENTRY 0x52544E45 |
| |
| #define CBFS_COMPRESS_NONE 0 |
| #define CBFS_COMPRESS_LZMA 1 |
| |
| struct cbfs_payload { |
| struct cbfs_payload_segment segments[1]; |
| }; |
| |
| void |
| cbfs_run_payload(struct cbfs_file *file) |
| { |
| if (!CONFIG_COREBOOT || !CONFIG_COREBOOT_FLASH || !file) |
| return; |
| dprintf(1, "Run %s\n", file->filename); |
| struct cbfs_payload *pay = (void*)file + ntohl(file->offset); |
| struct cbfs_payload_segment *seg = pay->segments; |
| for (;;) { |
| void *src = (void*)pay + ntohl(seg->offset); |
| void *dest = (void*)ntohl((u32)seg->load_addr); |
| u32 src_len = ntohl(seg->len); |
| u32 dest_len = ntohl(seg->mem_len); |
| switch (seg->type) { |
| case PAYLOAD_SEGMENT_BSS: |
| dprintf(3, "BSS segment %d@%p\n", dest_len, dest); |
| memset(dest, 0, dest_len); |
| break; |
| case PAYLOAD_SEGMENT_ENTRY: { |
| dprintf(1, "Calling addr %p\n", dest); |
| void (*func)() = dest; |
| func(); |
| return; |
| } |
| default: |
| dprintf(3, "Segment %x %d@%p -> %d@%p\n" |
| , seg->type, src_len, src, dest_len, dest); |
| if (seg->compression == htonl(CBFS_COMPRESS_NONE)) { |
| if (src_len > dest_len) |
| src_len = dest_len; |
| memcpy(dest, src, src_len); |
| } else if (CONFIG_LZMA |
| && seg->compression == htonl(CBFS_COMPRESS_LZMA)) { |
| int ret = ulzma(dest, dest_len, src, src_len); |
| if (ret < 0) |
| return; |
| src_len = ret; |
| } else { |
| dprintf(1, "No support for compression type %x\n" |
| , seg->compression); |
| return; |
| } |
| if (dest_len > src_len) |
| memset(dest + src_len, 0, dest_len - src_len); |
| break; |
| } |
| seg++; |
| } |
| } |
| |
| // Register payloads in "img/" directory with boot system. |
| void |
| cbfs_payload_setup(void) |
| { |
| struct cbfs_file *file = NULL; |
| for (;;) { |
| file = cbfs_findprefix("img/", file); |
| if (!file) |
| break; |
| const char *filename = cbfs_filename(file); |
| char *desc = znprintf(MAXDESCSIZE, "Payload [%s]", &filename[4]); |
| boot_add_cbfs(file, desc, bootprio_find_named_rom(filename, 0)); |
| } |
| } |
| |
| void |
| coreboot_setup(void) |
| { |
| coreboot_fill_map(); |
| cbfs_setup(); |
| } |