| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #ifndef _CBFS_H_ |
| #define _CBFS_H_ |
| |
| #include <cbmem.h> |
| #include <commonlib/bsd/cbfs_mdata.h> |
| #include <commonlib/mem_pool.h> |
| #include <commonlib/region.h> |
| #include <endian.h> |
| #include <program_loading.h> |
| #include <types.h> |
| #include <vb2_sha.h> |
| |
| |
| /********************************************************************************************** |
| * CBFS FILE ACCESS APIs * |
| **********************************************************************************************/ |
| |
| /* |
| * These are the APIs used to access files in CBFS. In order to keep the calls simple and free |
| * of clutter in the common cases, but still offer all advanced functionality when needed, there |
| * are many different variations that are implemented by wrapping the same underlying API with |
| * static inlines. All accessors have in common that they look up files by name, and will |
| * transparently decompress files that are compressed. |
| * |
| * There are three main flavors of CBFS accessors: |
| * |
| * size_t cbfs_load(char *name, void *buf, size_t size): Loads the contents of a CBFS file into |
| * a buffer provided by the caller (by providing pointer and size to it). Will return the |
| * amount of bytes loaded on success, or 0 on error. |
| * |
| * void *cbfs_map(char *name, size_t *size_out): Maps a file into the address space. If the file |
| * is not compressed and the platform supports direct memory-mapping for the boot medium, |
| * a pointer to the platform mapping is returned directly. In all other cases, memory will |
| * be allocated from the cbfs_cache and file data will be loaded into there. Returns a |
| * pointer to the mapping on success, or NULL on error. If an optional size_out parameter |
| * is passed in, it will be filled out with the size of the mapped data. Caller should call |
| * cbfs_unmap() after it is done using the mapping to free up the cbfs_cache if possible. |
| * |
| * void *cbfs_alloc(char *name, cbfs_allocator_t allocator, void *arg, size_t *size_out): Loads |
| * file data into memory provided by a custom allocator function that the caller passes in. |
| * The caller may pass an argument that is passed through verbatim to the allocator. |
| * Returns the pointer returned by the allocator (where the file data was loaded to) on |
| * success, or NULL on error. If an optional size_out parameter is passed in, it will be |
| * filled out with the size of the loaded data. |
| * |
| * void *cbfs_cbmem_alloc(char *name, uint32_t cbmem_id, size_t *size_out): Wrapper around |
| * cbfs_alloc() that will provide an allocator function for allocating space for the file |
| * data in CBMEM, with the provided CBMEM ID. |
| * |
| * All of these flavors have variations with any of the following optional parameters added: |
| * |
| * ..._ro_...: Will force looking up the CBFS file in the read-only CBFS (the "COREBOOT" FMAP |
| * section), even when running in an RW stage from one of the RW CBFSs. Only relevant if |
| * CONFIG(VBOOT) is set. |
| * |
| * ..._unverified_area_...: Will look for the CBFS file in the named FMAP area, rather than |
| * any of the default (RO or RW) CBFSs. Files accessed this way are *not* verified in any |
| * way (even if CONFIG(CBFS_VERIFICATION) is enabled) and should always be treated as |
| * untrusted (potentially malicious) data. Mutually exclusive with the ..._ro_... variant. |
| * |
| * ..._type_...: May pass in an extra enum cbfs_type *type parameter. If the value it points to |
| * is CBFS_TYPE_QUERY, it will be replaced with the actual CBFS type of the found file. If |
| * it is anything else, the type will be compared with the actually found type, and the |
| * operation will fail if they don't match. |
| */ |
| |
| /* |
| * An allocator function for passing to cbfs_alloc(). Takes the argument that was originally |
| * passed to cbfs_alloc(), the size of the file to be loaded, and a pointer to the already |
| * loaded and verified file metadata (for rare cases where the allocator needs to check custom |
| * attributes). Must return a pointer to space of the requested size where the file data should |
| * be loaded, or NULL to make the operation fail. |
| */ |
| typedef void *(*cbfs_allocator_t)(void *arg, size_t size, const union cbfs_mdata *mdata); |
| |
| static inline size_t cbfs_load(const char *name, void *buf, size_t size); |
| static inline size_t cbfs_ro_load(const char *name, void *buf, size_t size); |
| static inline size_t cbfs_type_load(const char *name, void *buf, size_t size, |
| enum cbfs_type *type); |
| static inline size_t cbfs_ro_type_load(const char *name, void *buf, size_t size, |
| enum cbfs_type *type); |
| static inline size_t cbfs_unverified_area_load(const char *area, const char *name, |
| void *buf, size_t size); |
| |
| static inline void *cbfs_map(const char *name, size_t *size_out); |
| static inline void *cbfs_ro_map(const char *name, size_t *size_out); |
| static inline void *cbfs_type_map(const char *name, size_t *size_out, enum cbfs_type *type); |
| static inline void *cbfs_ro_type_map(const char *name, size_t *size_out, enum cbfs_type *type); |
| static inline void *cbfs_unverified_area_map(const char *area, const char *name, |
| size_t *size_out); |
| |
| static inline void *cbfs_alloc(const char *name, cbfs_allocator_t allocator, void *arg, |
| size_t *size_out); |
| static inline void *cbfs_ro_alloc(const char *name, cbfs_allocator_t allocator, void *arg, |
| size_t *size_out); |
| static inline void *cbfs_type_alloc(const char *name, cbfs_allocator_t allocator, void *arg, |
| size_t *size_out, enum cbfs_type *type); |
| static inline void *cbfs_ro_type_alloc(const char *name, cbfs_allocator_t allocator, void *arg, |
| size_t *size_out, enum cbfs_type *type); |
| static inline void *cbfs_unverified_area_alloc(const char *area, const char *name, |
| cbfs_allocator_t allocator, void *arg, |
| size_t *size_out); |
| |
| static inline void *cbfs_cbmem_alloc(const char *name, uint32_t cbmem_id, size_t *size_out); |
| static inline void *cbfs_ro_cbmem_alloc(const char *name, uint32_t cbmem_id, size_t *size_out); |
| static inline void *cbfs_type_cbmem_alloc(const char *name, uint32_t cbmem_id, size_t *size_out, |
| enum cbfs_type *type); |
| static inline void *cbfs_ro_type_cbmem_alloc(const char *name, uint32_t cbmem_id, |
| size_t *size_out, enum cbfs_type *type); |
| static inline void *cbfs_unverified_area_cbmem_alloc(const char *area, const char *name, |
| uint32_t cbmem_id, size_t *size_out); |
| |
| /* |
| * Starts the processes of preloading a file into RAM. |
| * |
| * This method depends on COOP_MULTITASKING to parallelize the loading. This method is only |
| * effective when the underlying rdev supports DMA operations. |
| * |
| * When `cbfs_load`, `cbfs_alloc`, or `cbfs_map` are called after a preload has been started, |
| * they will wait for the preload to complete (if it hasn't already) and then perform |
| * verification and/or decompression. |
| * |
| * This method does not have a return value because the system should boot regardless if this |
| * method succeeds or fails. |
| */ |
| void cbfs_preload(const char *name); |
| |
| /* 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. */ |
| void cbfs_unmap(void *mapping); |
| |
| /* Load stage into memory filling in prog. Return 0 on success. < 0 on error. */ |
| int cbfs_prog_stage_load(struct prog *prog); |
| |
| /* Returns the size of a CBFS file, or 0 on error. Avoid using this function to allocate space, |
| and instead use cbfs_alloc() so the file only needs to be looked up once. */ |
| static inline size_t cbfs_get_size(const char *name); |
| static inline size_t cbfs_ro_get_size(const char *name); |
| |
| /* Returns the type of a CBFS file, or CBFS_TYPE_NULL on error. Use cbfs_type_load() instead of |
| this where possible to avoid looking up the file more than once. */ |
| static inline enum cbfs_type cbfs_get_type(const char *name); |
| static inline enum cbfs_type cbfs_ro_get_type(const char *name); |
| |
| /* Check whether a CBFS file exists. */ |
| static inline bool cbfs_file_exists(const char *name); |
| static inline bool cbfs_ro_file_exists(const char *name); |
| |
| |
| /********************************************************************************************** |
| * BOOT DEVICE HELPER APIs * |
| **********************************************************************************************/ |
| |
| /* |
| * The shared memory pool for backing mapped CBFS files, and other CBFS allocation needs. |
| */ |
| extern struct mem_pool cbfs_cache; |
| |
| /* |
| * 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; |
| void *mcache; |
| size_t mcache_size; |
| }; |
| |
| /* Helper to fill out |mcache| and |mcache_size| in a 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). |
| */ |
| 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. |
| */ |
| cb_err_t cbfs_init_boot_device(const struct cbfs_boot_device *cbd, |
| struct vb2_hash *metadata_hash); |
| |
| |
| /********************************************************************************************** |
| * INTERNAL HELPERS FOR INLINES, DO NOT USE. * |
| **********************************************************************************************/ |
| cb_err_t _cbfs_boot_lookup(const char *name, bool force_ro, |
| union cbfs_mdata *mdata, struct region_device *rdev); |
| |
| void *_cbfs_alloc(const char *name, cbfs_allocator_t allocator, void *arg, |
| size_t *size_out, bool force_ro, enum cbfs_type *type); |
| |
| void *_cbfs_unverified_area_alloc(const char *area, const char *name, |
| cbfs_allocator_t allocator, void *arg, size_t *size_out); |
| |
| struct _cbfs_default_allocator_arg { |
| void *buf; |
| size_t buf_size; |
| }; |
| void *_cbfs_default_allocator(void *arg, size_t size, const union cbfs_mdata *unused); |
| |
| void *_cbfs_cbmem_allocator(void *arg, size_t size, const union cbfs_mdata *unused); |
| |
| /********************************************************************************************** |
| * INLINE IMPLEMENTATIONS * |
| **********************************************************************************************/ |
| static inline void *cbfs_alloc(const char *name, cbfs_allocator_t allocator, void *arg, |
| size_t *size_out) |
| { |
| return cbfs_type_alloc(name, allocator, arg, size_out, NULL); |
| } |
| |
| static inline void *cbfs_ro_alloc(const char *name, cbfs_allocator_t allocator, void *arg, |
| size_t *size_out) |
| { |
| return cbfs_ro_type_alloc(name, allocator, arg, size_out, NULL); |
| } |
| |
| static inline void *cbfs_type_alloc(const char *name, cbfs_allocator_t allocator, void *arg, |
| size_t *size_out, enum cbfs_type *type) |
| { |
| return _cbfs_alloc(name, allocator, arg, size_out, false, type); |
| } |
| |
| static inline void *cbfs_ro_type_alloc(const char *name, cbfs_allocator_t allocator, void *arg, |
| size_t *size_out, enum cbfs_type *type) |
| { |
| return _cbfs_alloc(name, allocator, arg, size_out, true, type); |
| } |
| |
| static inline void *cbfs_unverified_area_alloc(const char *area, const char *name, |
| cbfs_allocator_t allocator, void *arg, |
| size_t *size_out) |
| { |
| return _cbfs_unverified_area_alloc(area, name, allocator, arg, size_out); |
| } |
| |
| static inline void *cbfs_map(const char *name, size_t *size_out) |
| { |
| return cbfs_type_map(name, size_out, NULL); |
| } |
| |
| static inline void *cbfs_ro_map(const char *name, size_t *size_out) |
| { |
| return cbfs_ro_type_map(name, size_out, NULL); |
| } |
| |
| static inline void *cbfs_type_map(const char *name, size_t *size_out, enum cbfs_type *type) |
| { |
| return cbfs_type_alloc(name, NULL, NULL, size_out, type); |
| } |
| |
| static inline void *cbfs_ro_type_map(const char *name, size_t *size_out, enum cbfs_type *type) |
| { |
| return cbfs_ro_type_alloc(name, NULL, NULL, size_out, type); |
| } |
| |
| static inline void *cbfs_unverified_area_map(const char *area, const char *name, |
| size_t *size_out) |
| { |
| return _cbfs_unverified_area_alloc(area, name, NULL, NULL, size_out); |
| } |
| |
| static inline size_t _cbfs_load(const char *name, void *buf, size_t size, bool force_ro, |
| enum cbfs_type *type) |
| { |
| struct _cbfs_default_allocator_arg arg = { .buf = buf, .buf_size = size }; |
| if (_cbfs_alloc(name, _cbfs_default_allocator, &arg, &size, force_ro, type)) |
| return size; |
| else |
| return 0; |
| } |
| |
| static inline size_t cbfs_load(const char *name, void *buf, size_t size) |
| { |
| return cbfs_type_load(name, buf, size, NULL); |
| } |
| |
| static inline size_t cbfs_type_load(const char *name, void *buf, size_t size, |
| enum cbfs_type *type) |
| { |
| return _cbfs_load(name, buf, size, false, type); |
| } |
| |
| static inline size_t cbfs_ro_load(const char *name, void *buf, size_t size) |
| { |
| return cbfs_ro_type_load(name, buf, size, NULL); |
| } |
| |
| static inline size_t cbfs_ro_type_load(const char *name, void *buf, size_t size, |
| enum cbfs_type *type) |
| { |
| return _cbfs_load(name, buf, size, true, type); |
| } |
| |
| static inline size_t cbfs_unverified_area_load(const char *area, const char *name, |
| void *buf, size_t size) |
| { |
| struct _cbfs_default_allocator_arg arg = { .buf = buf, .buf_size = size }; |
| if (_cbfs_unverified_area_alloc(area, name, _cbfs_default_allocator, &arg, &size)) |
| return size; |
| else |
| return 0; |
| } |
| |
| static inline void *cbfs_cbmem_alloc(const char *name, uint32_t cbmem_id, size_t *size_out) |
| { |
| return cbfs_type_cbmem_alloc(name, cbmem_id, size_out, NULL); |
| } |
| |
| static inline void *cbfs_ro_cbmem_alloc(const char *name, uint32_t cbmem_id, size_t *size_out) |
| { |
| return cbfs_ro_type_cbmem_alloc(name, cbmem_id, size_out, NULL); |
| } |
| |
| static inline void *cbfs_type_cbmem_alloc(const char *name, uint32_t cbmem_id, size_t *size_out, |
| enum cbfs_type *type) |
| { |
| return cbfs_type_alloc(name, _cbfs_cbmem_allocator, (void *)(uintptr_t)cbmem_id, |
| size_out, type); |
| } |
| |
| static inline void *cbfs_ro_type_cbmem_alloc(const char *name, uint32_t cbmem_id, |
| size_t *size_out, enum cbfs_type *type) |
| { |
| return cbfs_ro_type_alloc(name, _cbfs_cbmem_allocator, (void *)(uintptr_t)cbmem_id, |
| size_out, type); |
| } |
| |
| static inline void *cbfs_unverified_area_cbmem_alloc(const char *area, const char *name, |
| uint32_t cbmem_id, size_t *size_out) |
| { |
| return _cbfs_unverified_area_alloc(area, name, _cbfs_cbmem_allocator, |
| (void *)(uintptr_t)cbmem_id, size_out); |
| } |
| |
| static inline size_t cbfs_get_size(const char *name) |
| { |
| union cbfs_mdata mdata; |
| struct region_device rdev; |
| if (_cbfs_boot_lookup(name, false, &mdata, &rdev) != CB_SUCCESS) |
| return 0; |
| return be32toh(mdata.h.len); |
| } |
| |
| static inline size_t cbfs_ro_get_size(const char *name) |
| { |
| union cbfs_mdata mdata; |
| struct region_device rdev; |
| if (_cbfs_boot_lookup(name, true, &mdata, &rdev) != CB_SUCCESS) |
| return 0; |
| return be32toh(mdata.h.len); |
| } |
| |
| static inline enum cbfs_type cbfs_get_type(const char *name) |
| { |
| union cbfs_mdata mdata; |
| struct region_device rdev; |
| if (_cbfs_boot_lookup(name, false, &mdata, &rdev) != CB_SUCCESS) |
| return CBFS_TYPE_NULL; |
| return be32toh(mdata.h.type); |
| } |
| |
| static inline enum cbfs_type cbfs_ro_get_type(const char *name) |
| { |
| union cbfs_mdata mdata; |
| struct region_device rdev; |
| if (_cbfs_boot_lookup(name, true, &mdata, &rdev) != CB_SUCCESS) |
| return CBFS_TYPE_NULL; |
| return be32toh(mdata.h.type); |
| } |
| |
| static inline bool cbfs_file_exists(const char *name) |
| { |
| union cbfs_mdata mdata; |
| struct region_device rdev; |
| if (_cbfs_boot_lookup(name, false, &mdata, &rdev) != CB_SUCCESS) |
| return false; |
| return true; |
| } |
| |
| static inline bool cbfs_ro_file_exists(const char *name) |
| { |
| union cbfs_mdata mdata; |
| struct region_device rdev; |
| if (_cbfs_boot_lookup(name, true, &mdata, &rdev) != CB_SUCCESS) |
| return false; |
| return true; |
| } |
| |
| #endif |