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Diffstat (limited to 'src/lib/romselfboot.c')
| -rw-r--r-- | src/lib/romselfboot.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/src/lib/romselfboot.c b/src/lib/romselfboot.c new file mode 100644 index 000000000000..416e797a174f --- /dev/null +++ b/src/lib/romselfboot.c @@ -0,0 +1,219 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2003 Eric W. Biederman <ebiederm@xmission.com> + * Copyright (C) 2009 Ron Minnich <rminnich@gmail.com> + * Copyright (C) 2016 George Trudeau <george.trudeau@usherbrooke.ca> + * + * 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 <commonlib/compression.h> +#include <commonlib/endian.h> +#include <console/console.h> +#include <cpu/cpu.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> +#include <symbols.h> +#include <cbfs.h> +#include <lib.h> +#include <bootmem.h> +#include <program_loading.h> +#include <timestamp.h> + +struct segment { + struct segment *next; + struct segment *prev; + unsigned long s_dstaddr; + unsigned long s_srcaddr; + unsigned long s_memsz; + unsigned long s_filesz; + int compression; +}; + +/* Decode a serialized cbfs payload segment + * from memory into native endianness. + */ +static void cbfs_decode_payload_segment(struct cbfs_payload_segment *segment, + const struct cbfs_payload_segment *src) +{ + segment->type = read_be32(&src->type); + segment->compression = read_be32(&src->compression); + segment->offset = read_be32(&src->offset); + segment->load_addr = read_be64(&src->load_addr); + segment->len = read_be32(&src->len); + segment->mem_len = read_be32(&src->mem_len); +} + +static int +load_segment(struct segment *ptr) +{ + unsigned char *dest, *src, *end; + size_t len, memsz; + + printk(BIOS_DEBUG, + "Loading Segment: addr: 0x%016lx memsz: 0x%016lx filesz: 0x%016lx\n", + ptr->s_dstaddr, ptr->s_memsz, ptr->s_filesz); + /* Compute the boundaries of the segment */ + dest = (unsigned char *)(ptr->s_dstaddr); + src = (unsigned char *)(ptr->s_srcaddr); + len = ptr->s_filesz; + memsz = ptr->s_memsz; + end = dest + memsz; + + switch (ptr->compression) { + case CBFS_COMPRESS_LZMA: { + printk(BIOS_DEBUG, "using LZMA\n"); + timestamp_add_now(TS_START_ULZMA); + len = ulzman(src, len, dest, memsz); + timestamp_add_now(TS_END_ULZMA); + if (!len) /* Decompression Error. */ + return 0; + break; + } + case CBFS_COMPRESS_LZ4: { + printk(BIOS_DEBUG, "using LZ4\n"); + timestamp_add_now(TS_START_ULZ4F); + len = ulz4fn(src, len, dest, memsz); + timestamp_add_now(TS_END_ULZ4F); + if (!len) /* Decompression Error. */ + return 0; + break; + } + case CBFS_COMPRESS_NONE: { + printk(BIOS_DEBUG, "it's not compressed!\n"); + memcpy(dest, src, len); + break; + } + default: + printk(BIOS_INFO, "CBFS: Unknown compression type %d\n", + ptr->compression); + return -1; + } + return 0; +} + +/* This loads the payload from a romstage. + * This is different than the ramstage payload loader since we don't + * check memory regions and we don't use malloc anywhere. It is most like + * the LinuxBIOS v3 SELF loader. + */ +static int load_payload( + struct segment *head, + struct cbfs_payload *cbfs_payload, uintptr_t *entry) +{ + struct segment *new; + struct cbfs_payload_segment *current_segment, *first_segment, segment; + struct segment ptr; + + memset(head, 0, sizeof(*head)); + head->next = head->prev = head; + + first_segment = &cbfs_payload->segments; + + for (current_segment = first_segment;; ++current_segment) { + printk(BIOS_DEBUG, + "Decoding segment from ROM address 0x%p\n", + current_segment); + + cbfs_decode_payload_segment(&segment, current_segment); + + switch (segment.type) { + case PAYLOAD_SEGMENT_PARAMS: + printk(BIOS_DEBUG, " parameter section (skipped)\n"); + continue; + + case PAYLOAD_SEGMENT_CODE: + case PAYLOAD_SEGMENT_DATA: + printk(BIOS_DEBUG, " %s (compression=%x)\n", + segment.type == PAYLOAD_SEGMENT_CODE + ? "code" + : "data", + segment.compression); + + new = &ptr; + new->s_dstaddr = segment.load_addr; + new->s_memsz = segment.mem_len; + new->compression = segment.compression; + new->s_srcaddr = (uintptr_t)((unsigned char *)first_segment) + + segment.offset; + new->s_filesz = segment.len; + + printk(BIOS_DEBUG, + " New segment dstaddr 0x%lx memsize 0x%lx srcaddr 0x%lx filesize 0x%lx\n", + new->s_dstaddr, new->s_memsz, new->s_srcaddr, + new->s_filesz); + + /* Clean up the values */ + if (new->s_filesz > new->s_memsz) { + new->s_filesz = new->s_memsz; + printk(BIOS_DEBUG, + " cleaned up filesize 0x%lx\n", + new->s_filesz); + } + load_segment(new); + break; + + case PAYLOAD_SEGMENT_BSS: + printk(BIOS_DEBUG, " BSS 0x%p (%d byte)\n", (void *)(intptr_t)segment.load_addr, segment.mem_len); + + new = &ptr; + new->s_filesz = 0; + new->s_srcaddr = (uintptr_t)((unsigned char *)first_segment) + + segment.offset; + new->s_dstaddr = segment.load_addr; + new->s_memsz = segment.mem_len; + new->compression = CBFS_COMPRESS_NONE; + load_segment(new); + break; + + case PAYLOAD_SEGMENT_ENTRY: + printk(BIOS_DEBUG, " Entry Point 0x%p\n", (void *)(intptr_t)segment.load_addr); + + *entry = segment.load_addr; + /* Per definition, a payload always has the entry point + * as last segment. Thus, we use the occurrence of the + * entry point as break condition for the loop. + * Can we actually just look at the number of section? + */ + return 1; + + default: + /* We found something that we don't know about. Throw + * hands into the sky and run away! + */ + printk(BIOS_EMERG, "Bad segment type %x\n", + segment.type); + return -1; + } + } + + return 1; +} + +bool selfload(struct prog *payload, bool check_regions) +{ + uintptr_t entry = 0; + struct segment head; + void *data; + + data = rdev_mmap_full(prog_rdev(payload)); + if (data == NULL) + return false; + + /* Load the segments */ + if (!load_payload(&head, data, &entry)) + return false; + + prog_set_entry(payload, (void *)entry, NULL); + printk(BIOS_SPEW, "Loaded segments\n"); + return true; +} |