diff options
| -rw-r--r-- | src/include/cbfs.h | 67 | ||||
| -rw-r--r-- | src/lib/cbfs.c | 99 |
2 files changed, 76 insertions, 90 deletions
diff --git a/src/include/cbfs.h b/src/include/cbfs.h index cad01c623d..431f6e5fea 100644 --- a/src/include/cbfs.h +++ b/src/include/cbfs.h @@ -17,35 +17,36 @@ void *cbfs_boot_map_optionrom(uint16_t vendor, uint16_t device); /* Return mapping of option ROM with revision number. Returns NULL on error. */ void *cbfs_boot_map_optionrom_revision(uint16_t vendor, uint16_t device, uint8_t rev); + /* Locate file by name and optional type. Return 0 on success. < 0 on error. */ int cbfs_boot_locate(struct cbfsf *fh, const char *name, uint32_t *type); -/* Map file into memory, returning a pointer to the mapping or NULL on error. - If |size_out| is not NULL, it will pass out the size of the mapped file. - NOTE: Since this may return a direct pointer to memory-mapped hardware, - compressed files are NOT transparently decompressed (unlike cbfs_load()). */ -void *cbfs_map(const char *name, size_t *size_out); -/* Like cbfs_map(), except that it will always read from the read-only CBFS - ("COREBOOT" FMAP region), even when CONFIG(VBOOT) is enabled. */ -void *cbfs_ro_map(const char *name, size_t *size_out); -/* Removes a previously allocated CBFS mapping. Should try to unmap mappings in - strict LIFO order where possible, since mapping backends often don't support - more complicated cases. */ -int cbfs_unmap(void *mapping); /* Locate file in a specific region of fmap. Return 0 on success. < 0 on error*/ int cbfs_locate_file_in_region(struct cbfsf *fh, const char *region_name, const char *name, uint32_t *type); -/* Load a file from CBFS into a buffer. Returns amount of loaded bytes on - success or 0 on error. File will get decompressed as necessary. Same - decompression requirements as cbfs_load_and_decompress(). */ + +/* Map file into memory, returning a pointer to the mapping or NULL on error. If |size_out| is + not NULL, it will pass out the size of the mapped file. + NOTE: Since this may return a direct pointer to memory-mapped hardware, compressed files are + NOT transparently decompressed (unlike cbfs_load()). */ +void *cbfs_map(const char *name, size_t *size_out); +/* Like cbfs_map(), except that it will always read from the read-only CBFS (the "COREBOOT" FMAP + region), even when CONFIG(VBOOT) is enabled. */ +void *cbfs_ro_map(const char *name, size_t *size_out); +/* Removes a previously allocated CBFS mapping. Should try to unmap mappings in strict LIFO + order where possible, since mapping backends often don't support more complicated cases. */ +int cbfs_unmap(void *mapping); + +/* Load a file from CBFS into a buffer. Returns amount of loaded bytes on success or 0 on error. + File will get decompressed as necessary. */ size_t cbfs_load(const char *name, void *buf, size_t buf_size); -/* Like cbfs_load(), except that it will always read from the read-only CBFS - ("COREBOOT" FMAP region), even when CONFIG(VBOOT) is enabled. */ +/* Like cbfs_load(), except that it will always read from the read-only CBFS (the "COREBOOT" + FMAP region), even when CONFIG(VBOOT) is enabled. */ size_t cbfs_ro_load(const char *name, void *buf, size_t buf_size); -/* Load |in_size| bytes from |rdev| at |offset| to the |buffer_size| bytes - * large |buffer|, decompressing it according to |compression| in the process. - * Returns the decompressed file size, or 0 on error. - * LZMA files will be mapped for decompression. LZ4 files will be decompressed - * in-place with the buffer size requirements outlined in compression.h. */ + +/* Load |in_size| bytes from |rdev| at |offset| to the |buffer_size| bytes large |buffer|, + decompressing it according to |compression| in the process. Returns the decompressed file + size, or 0 on error. LZMA files will be mapped for decompression. LZ4 files will be + decompressed in-place with the buffer size requirements outlined in compression.h. */ size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset, size_t in_size, void *buffer, size_t buffer_size, uint32_t compression); @@ -53,10 +54,9 @@ size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset, int cbfs_prog_stage_load(struct prog *prog); /* - * Data structure that represents "a" CBFS boot device, with optional metadata - * cache. Generally we only have one of these, or two (RO and RW) when - * CONFIG(VBOOT) is set. The region device stored here must always be a - * subregion of boot_device_ro(). + * Data structure that represents "a" CBFS boot device, with optional metadata cache. Generally + * we only have one of these, or two (RO and RW) when CONFIG(VBOOT) is set. The region device + * stored here must always be a subregion of boot_device_ro(). */ struct cbfs_boot_device { struct region_device rdev; @@ -68,18 +68,17 @@ struct cbfs_boot_device { void cbfs_boot_device_find_mcache(struct cbfs_boot_device *cbd, uint32_t id); /* - * Retrieves the currently active CBFS boot device. If |force_ro| is set, will - * always return the read-only CBFS instead (this only makes a difference when - * CONFIG(VBOOT) is enabled). May perform certain CBFS initialization tasks. - * Returns NULL on error (e.g. boot device IO error). + * Retrieves the currently active CBFS boot device. If |force_ro| is set, will always return the + * read-only CBFS instead (this only makes a difference when CONFIG(VBOOT) is enabled). May + * perform certain CBFS initialization tasks. Returns NULL on error (e.g. boot device IO error). */ const struct cbfs_boot_device *cbfs_get_boot_device(bool force_ro); /* - * Builds the mcache (if |cbd->mcache| is set) and verifies |metadata_hash| (if - * it is not NULL). If CB_CBFS_CACHE_FULL is returned, the mcache is incomplete - * but still valid and the metadata hash was still verified. Should be called - * once per *boot* (not once per stage) before the first CBFS access. + * Builds the mcache (if |cbd->mcache| is set) and verifies |metadata_hash| (if it is not NULL). + * If CB_CBFS_CACHE_FULL is returned, the mcache is incomplete but still valid and the metadata + * hash was still verified. Should be called once per *boot* (not once per stage) before the + * first CBFS access. */ cb_err_t cbfs_init_boot_device(const struct cbfs_boot_device *cbd, struct vb2_hash *metadata_hash); diff --git a/src/lib/cbfs.c b/src/lib/cbfs.c index 4bc6962562..be2ab72662 100644 --- a/src/lib/cbfs.c +++ b/src/lib/cbfs.c @@ -29,7 +29,7 @@ cb_err_t cbfs_boot_lookup(const char *name, bool force_ro, cb_err_t err = CB_CBFS_CACHE_FULL; if (!CONFIG(NO_CBFS_MCACHE) && !ENV_SMM && cbd->mcache_size) err = cbfs_mcache_lookup(cbd->mcache, cbd->mcache_size, - name, mdata, &data_offset); + name, mdata, &data_offset); if (err == CB_CBFS_CACHE_FULL) { struct vb2_hash *metadata_hash = NULL; if (CONFIG(TOCTOU_SAFETY)) { @@ -37,21 +37,17 @@ cb_err_t cbfs_boot_lookup(const char *name, bool force_ro, dead_code(); if (!cbd->mcache_size) die("Cannot access CBFS TOCTOU-safely in " ENV_STRING " before CBMEM init!\n"); - /* We can only reach this for the RW CBFS -- an mcache - overflow in the RO CBFS would have been caught when - building the mcache in cbfs_get_boot_device(). - (Note that TOCTOU_SAFETY implies !NO_CBFS_MCACHE.) */ + /* We can only reach this for the RW CBFS -- an mcache overflow in the + RO CBFS would have been caught when building the mcache in cbfs_get + boot_device(). (Note that TOCTOU_SAFETY implies !NO_CBFS_MCACHE.) */ assert(cbd == vboot_get_cbfs_boot_device()); /* TODO: set metadata_hash to RW metadata hash here. */ } - err = cbfs_lookup(&cbd->rdev, name, mdata, &data_offset, - metadata_hash); + err = cbfs_lookup(&cbd->rdev, name, mdata, &data_offset, metadata_hash); } - if (CONFIG(VBOOT_ENABLE_CBFS_FALLBACK) && !force_ro && - err == CB_CBFS_NOT_FOUND) { - printk(BIOS_INFO, "CBFS: Fall back to RO region for %s\n", - name); + if (CONFIG(VBOOT_ENABLE_CBFS_FALLBACK) && !force_ro && err == CB_CBFS_NOT_FOUND) { + printk(BIOS_INFO, "CBFS: Fall back to RO region for %s\n", name); return cbfs_boot_lookup(name, true, mdata, rdev); } if (err) { @@ -60,8 +56,7 @@ cb_err_t cbfs_boot_lookup(const char *name, bool force_ro, else if (err == CB_CBFS_HASH_MISMATCH) printk(BIOS_ERR, "CBFS ERROR: metadata hash mismatch!\n"); else - printk(BIOS_ERR, - "CBFS ERROR: error %d when looking up '%s'\n", + printk(BIOS_ERR, "CBFS ERROR: error %d when looking up '%s'\n", err, name); return err; } @@ -82,8 +77,7 @@ int cbfs_boot_locate(struct cbfsf *fh, const char *name, uint32_t *type) return -1; size_t msize = be32toh(fh->mdata.h.offset); - if (rdev_chain(&fh->metadata, &addrspace_32bit.rdev, - (uintptr_t)&fh->mdata, msize)) + if (rdev_chain(&fh->metadata, &addrspace_32bit.rdev, (uintptr_t)&fh->mdata, msize)) return -1; if (type) { @@ -122,8 +116,8 @@ void *cbfs_ro_map(const char *name, size_t *size_out) int cbfs_unmap(void *mapping) { - /* This works because munmap() only works on the root rdev and never - cares about which chained subregion something was mapped from. */ + /* This works because munmap() only works on the root rdev and never cares about which + chained subregion something was mapped from. */ return rdev_munmap(boot_device_ro(), mapping); } @@ -133,8 +127,7 @@ int cbfs_locate_file_in_region(struct cbfsf *fh, const char *region_name, struct region_device rdev; int ret = 0; if (fmap_locate_area_as_rdev(region_name, &rdev)) { - LOG("%s region not found while looking for %s\n", - region_name, name); + LOG("%s region not found while looking for %s\n", region_name, name); return -1; } @@ -189,14 +182,13 @@ static inline bool cbfs_lzma_enabled(void) return false; if (ENV_ROMSTAGE && CONFIG(POSTCAR_STAGE)) return false; - if ((ENV_ROMSTAGE || ENV_POSTCAR) - && !CONFIG(COMPRESS_RAMSTAGE)) + if ((ENV_ROMSTAGE || ENV_POSTCAR) && !CONFIG(COMPRESS_RAMSTAGE)) return false; return true; } -size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset, - size_t in_size, void *buffer, size_t buffer_size, uint32_t compression) +size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset, size_t in_size, + void *buffer, size_t buffer_size, uint32_t compression) { size_t out_size; void *map; @@ -213,8 +205,8 @@ size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset, if (!cbfs_lz4_enabled()) return 0; - /* cbfs_stage_load_and_decompress() takes care of in-place - lz4 decompression by setting up the rdev to be in memory. */ + /* cbfs_stage_load_and_decompress() takes care of in-place LZ4 decompression by + setting up the rdev to be in memory. */ map = rdev_mmap(rdev, offset, in_size); if (map == NULL) return 0; @@ -248,33 +240,31 @@ size_t cbfs_load_and_decompress(const struct region_device *rdev, size_t offset, } } -static size_t cbfs_stage_load_and_decompress(const struct region_device *rdev, - size_t offset, size_t in_size, void *buffer, size_t buffer_size, - uint32_t compression) +static size_t cbfs_stage_load_and_decompress(const struct region_device *rdev, size_t offset, + size_t in_size, void *buffer, size_t buffer_size, uint32_t compression) { struct region_device rdev_src; if (compression == CBFS_COMPRESS_LZ4) { if (!cbfs_lz4_enabled()) return 0; - /* Load the compressed image to the end of the available memory - * area for in-place decompression. It is the responsibility of - * the caller to ensure that buffer_size is large enough - * (see compression.h, guaranteed by cbfstool for stages). */ + /* Load the compressed image to the end of the available memory area for + in-place decompression. It is the responsibility of the caller to ensure that + buffer_size is large enough (see compression.h, guaranteed by cbfstool for + stages). */ void *compr_start = buffer + buffer_size - in_size; if (rdev_readat(rdev, compr_start, offset, in_size) != in_size) return 0; /* Create a region device backed by memory. */ - rdev_chain(&rdev_src, &addrspace_32bit.rdev, - (uintptr_t)compr_start, in_size); + rdev_chain(&rdev_src, &addrspace_32bit.rdev, (uintptr_t)compr_start, in_size); - return cbfs_load_and_decompress(&rdev_src, 0, in_size, buffer, - buffer_size, compression); + return cbfs_load_and_decompress(&rdev_src, 0, in_size, buffer, buffer_size, + compression); } /* All other algorithms can use the generic implementation. */ - return cbfs_load_and_decompress(rdev, offset, in_size, buffer, - buffer_size, compression); + return cbfs_load_and_decompress(rdev, offset, in_size, buffer, buffer_size, + compression); } static inline int tohex4(unsigned int c) @@ -317,8 +307,7 @@ void *cbfs_boot_map_optionrom_revision(uint16_t vendor, uint16_t device, uint8_t return cbfs_map(name, NULL); } -static size_t _cbfs_load(const char *name, void *buf, size_t buf_size, - bool force_ro) +static size_t _cbfs_load(const char *name, void *buf, size_t buf_size, bool force_ro) { struct region_device rdev; union cbfs_mdata mdata; @@ -390,7 +379,7 @@ int cbfs_prog_stage_load(struct prog *pstage) } fsize = cbfs_stage_load_and_decompress(fh, foffset, fsize, load, - stage.memlen, stage.compression); + stage.memlen, stage.compression); if (!fsize) return -1; @@ -422,8 +411,7 @@ void cbfs_boot_device_find_mcache(struct cbfs_boot_device *cbd, uint32_t id) } else if (ENV_ROMSTAGE_OR_BEFORE) { u8 *boundary = _ecbfs_mcache - REGION_SIZE(cbfs_mcache) * CONFIG_CBFS_MCACHE_RW_PERCENTAGE / 100; - boundary = (u8 *)ALIGN_DOWN((uintptr_t)boundary, - CBFS_MCACHE_ALIGNMENT); + boundary = (u8 *)ALIGN_DOWN((uintptr_t)boundary, CBFS_MCACHE_ALIGNMENT); if (id == CBMEM_ID_CBFS_RO_MCACHE) { cbd->mcache = _cbfs_mcache; cbd->mcache_size = boundary - _cbfs_mcache; @@ -435,20 +423,19 @@ void cbfs_boot_device_find_mcache(struct cbfs_boot_device *cbd, uint32_t id) } cb_err_t cbfs_init_boot_device(const struct cbfs_boot_device *cbd, - struct vb2_hash *metadata_hash) + struct vb2_hash *mdata_hash) { /* If we have an mcache, mcache_build() will also check mdata hash. */ if (!CONFIG(NO_CBFS_MCACHE) && !ENV_SMM && cbd->mcache_size > 0) - return cbfs_mcache_build(&cbd->rdev, cbd->mcache, - cbd->mcache_size, metadata_hash); + return cbfs_mcache_build(&cbd->rdev, cbd->mcache, cbd->mcache_size, mdata_hash); /* No mcache and no verification means we have nothing special to do. */ - if (!CONFIG(CBFS_VERIFICATION) || !metadata_hash) + if (!CONFIG(CBFS_VERIFICATION) || !mdata_hash) return CB_SUCCESS; - /* Verification only: use cbfs_walk() without a walker() function to - just run through the CBFS once, will return NOT_FOUND by default. */ - cb_err_t err = cbfs_walk(&cbd->rdev, NULL, NULL, metadata_hash, 0); + /* Verification only: use cbfs_walk() without a walker() function to just run through + the CBFS once, will return NOT_FOUND by default. */ + cb_err_t err = cbfs_walk(&cbd->rdev, NULL, NULL, mdata_hash, 0); if (err == CB_CBFS_NOT_FOUND) err = CB_SUCCESS; return err; @@ -458,22 +445,22 @@ const struct cbfs_boot_device *cbfs_get_boot_device(bool force_ro) { static struct cbfs_boot_device ro; - /* Ensure we always init RO mcache, even if first file is from RW. + /* Ensure we always init RO mcache, even if the first file is from the RW CBFS. Otherwise it may not be available when needed in later stages. */ if (ENV_INITIAL_STAGE && !force_ro && !region_device_sz(&ro.rdev)) cbfs_get_boot_device(true); if (!force_ro) { const struct cbfs_boot_device *rw = vboot_get_cbfs_boot_device(); - /* This will return NULL if vboot isn't enabled, didn't run yet - or decided to boot into recovery mode. */ + /* This will return NULL if vboot isn't enabled, didn't run yet or decided to + boot into recovery mode. */ if (rw) return rw; } - /* In rare cases post-RAM stages may run this before cbmem_initialize(), - so we can't lock in the result of find_mcache() on the first try and - should keep trying every time until an mcache is found. */ + /* In rare cases post-RAM stages may run this before cbmem_initialize(), so we can't + lock in the result of find_mcache() on the first try and should keep trying every + time until an mcache is found. */ cbfs_boot_device_find_mcache(&ro, CBMEM_ID_CBFS_RO_MCACHE); if (region_device_sz(&ro.rdev)) |