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-rw-r--r--payloads/libpayload/libcbfs/Makefile.inc1
-rw-r--r--payloads/libpayload/libcbfs/cbfs.c232
-rw-r--r--payloads/libpayload/libcbfs/cbfs_core.c198
-rw-r--r--payloads/libpayload/libcbfs/ram_media.c114
4 files changed, 420 insertions, 125 deletions
diff --git a/payloads/libpayload/libcbfs/Makefile.inc b/payloads/libpayload/libcbfs/Makefile.inc
index 50f4821732..0d3e1ec59a 100644
--- a/payloads/libpayload/libcbfs/Makefile.inc
+++ b/payloads/libpayload/libcbfs/Makefile.inc
@@ -28,4 +28,5 @@
##
libcbfs-$(CONFIG_CBFS) += cbfs.c
+libcbfs-$(CONFIG_CBFS) += ram_media.c
diff --git a/payloads/libpayload/libcbfs/cbfs.c b/payloads/libpayload/libcbfs/cbfs.c
index 026b73c965..35e48dda27 100644
--- a/payloads/libpayload/libcbfs/cbfs.c
+++ b/payloads/libpayload/libcbfs/cbfs.c
@@ -2,6 +2,7 @@
* This file is part of the libpayload project.
*
* Copyright (C) 2011 secunet Security Networks AG
+ * Copyright (C) 2013 Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -26,80 +27,221 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
+#define LIBPAYLOAD
+
+#ifdef LIBPAYLOAD
+# include <libpayload-config.h>
+# ifdef CONFIG_LZMA
+# include <lzma.h>
+# define CBFS_CORE_WITH_LZMA
+# endif
+# define CBFS_MINI_BUILD
+#elif defined(__SMM__)
+# define CBFS_MINI_BUILD
+#else
+# define CBFS_CORE_WITH_LZMA
+# include <lib.h>
+#endif
-#include <endian.h>
-#include <stdio.h>
-#include <string.h>
#include <cbfs.h>
+#include <string.h>
-#ifdef CONFIG_LZMA
-#define CBFS_CORE_WITH_LZMA
-#include <lzma.h>
+#ifdef LIBPAYLOAD
+# include <stdio.h>
+# define DEBUG(x...)
+# define LOG(x...) printf(x)
+# define ERROR(x...) printf(x)
+#else
+# include <console/console.h>
+# define ERROR(x...) printk(BIOS_ERR, "CBFS: " x)
+# define LOG(x...) printk(BIOS_INFO, "CBFS: " x)
+# if CONFIG_DEBUG_CBFS
+# define DEBUG(x...) printk(BIOS_SPEW, "CBFS: " x)
+# else
+# define DEBUG(x...)
+# endif
#endif
-#define ERROR(x...) printf(x)
-#define LOG(x...)
-
-static uint32_t host_virt_to_phys(void *addr);
-static void *host_phys_to_virt(uint32_t addr);
+#if defined(CONFIG_CBFS_HEADER_ROM_OFFSET) && (CONFIG_CBFS_HEADER_ROM_OFFSET)
+# define CBFS_HEADER_ROM_ADDRESS (CONFIG_CBFS_HEADER_ROM_OFFSET)
+#else
+// Indirect address: only works on 32bit top-aligned systems.
+# define CBFS_HEADER_ROM_ADDRESS (*(uint32_t*)0xfffffffc)
+#endif
-uint32_t romstart(void);
-uint32_t romend(void);
+#include "cbfs_core.c"
-#include <arch/virtual.h>
-static uint32_t host_virt_to_phys(void *addr)
+#ifndef __SMM__
+static inline int tohex4(unsigned int c)
{
- return virt_to_phys(addr);
+ return (c <= 9) ? (c + '0') : (c - 10 + 'a');
}
-static void *host_phys_to_virt(uint32_t addr)
+static void tohex16(unsigned int val, char* dest)
{
- return phys_to_virt(addr);
+ dest[0] = tohex4(val>>12);
+ dest[1] = tohex4((val>>8) & 0xf);
+ dest[2] = tohex4((val>>4) & 0xf);
+ dest[3] = tohex4(val & 0xf);
}
-#undef virt_to_phys
-#undef phys_to_virt
-uint32_t (*virt_to_phys)(void *) = host_virt_to_phys;
-void* (*phys_to_virt)(uint32_t) = host_phys_to_virt;
+void *cbfs_load_optionrom(struct cbfs_media *media, uint16_t vendor,
+ uint16_t device, void *dest)
+{
+ char name[17] = "pciXXXX,XXXX.rom";
+ struct cbfs_optionrom *orom;
+ uint8_t *src;
+ tohex16(vendor, name+3);
+ tohex16(device, name+8);
-uint32_t _romstart = 0xffffffff;
-uint32_t _romend = 0;
+ orom = (struct cbfs_optionrom *)
+ cbfs_get_file_content(media, name, CBFS_TYPE_OPTIONROM);
-uint32_t romstart(void)
-{
- return _romstart;
+ if (orom == NULL)
+ return NULL;
+
+ /* They might have specified a dest address. If so, we can decompress.
+ * If not, there's not much hope of decompressing or relocating the rom.
+ * in the common case, the expansion rom is uncompressed, we
+ * pass 0 in for the dest, and all we have to do is find the rom and
+ * return a pointer to it.
+ */
+
+ /* BUG: the cbfstool is (not yet) including a cbfs_optionrom header */
+ src = (uint8_t*)orom; // + sizeof(struct cbfs_optionrom);
+
+ if (! dest)
+ return src;
+
+ if (cbfs_decompress(ntohl(orom->compression),
+ src,
+ dest,
+ ntohl(orom->len)))
+ return NULL;
+
+ return dest;
}
-uint32_t romend(void)
+void * cbfs_load_stage(struct cbfs_media *media, const char *name)
{
- return _romend;
+ struct cbfs_stage *stage = (struct cbfs_stage *)
+ cbfs_get_file_content(media, name, CBFS_TYPE_STAGE);
+ /* this is a mess. There is no ntohll. */
+ /* for now, assume compatible byte order until we solve this. */
+ uint32_t entry;
+
+ if (stage == NULL)
+ return (void *) -1;
+
+ LOG("loading stage %s @ 0x%x (%d bytes), entry @ 0x%llx\n",
+ name,
+ (uint32_t) stage->load, stage->memlen,
+ stage->entry);
+ memset((void *) (uint32_t) stage->load, 0, stage->memlen);
+
+ if (cbfs_decompress(stage->compression,
+ ((unsigned char *) stage) +
+ sizeof(struct cbfs_stage),
+ (void *) (uint32_t) stage->load,
+ stage->len))
+ return (void *) -1;
+
+ DEBUG("stage loaded.\n");
+
+ entry = stage->entry;
+ // entry = ntohll(stage->entry);
+
+ return (void *) entry;
}
-#include "cbfs_core.c"
+int cbfs_execute_stage(struct cbfs_media *media, const char *name)
+{
+ struct cbfs_stage *stage = (struct cbfs_stage *)
+ cbfs_get_file_content(media, name, CBFS_TYPE_STAGE);
-static uint32_t ram_cbfs_offset;
+ if (stage == NULL)
+ return 1;
-static uint32_t ram_virt_to_phys(void *addr)
-{
- return (uint32_t)addr - ram_cbfs_offset;
+ if (ntohl(stage->compression) != CBFS_COMPRESS_NONE) {
+ LOG("Unable to run %s: Compressed file"
+ "Not supported for in-place execution\n", name);
+ return 1;
+ }
+
+ /* FIXME: This isn't right */
+ LOG("run @ %p\n", (void *) ntohl((uint32_t) stage->entry));
+ return run_address((void *)(uintptr_t)ntohll(stage->entry));
}
-static void *ram_phys_to_virt(uint32_t addr)
+void *cbfs_load_payload(struct cbfs_media *media, const char *name)
{
- return (void*)addr + ram_cbfs_offset;
+ return (struct cbfs_payload *)cbfs_get_file_content(
+ media, name, CBFS_TYPE_PAYLOAD);
}
-void setup_cbfs_from_ram(void* start, uint32_t size)
-{
- /* assumes rollover */
- ram_cbfs_offset = (uint32_t)start + size;
- virt_to_phys = ram_virt_to_phys;
- phys_to_virt = ram_phys_to_virt;
+struct cbfs_file *cbfs_find(const char *name) {
+ return cbfs_get_file(CBFS_DEFAULT_MEDIA, name);
+}
+
+void *cbfs_find_file(const char *name, int type) {
+ return cbfs_get_file_content(CBFS_DEFAULT_MEDIA, name, type);
+}
+
+const struct cbfs_header *get_cbfs_header(void) {
+ return cbfs_get_header(CBFS_DEFAULT_MEDIA);
}
-void setup_cbfs_from_flash(void)
+/* Simple buffer */
+
+void *cbfs_simple_buffer_map(struct cbfs_simple_buffer *buffer,
+ struct cbfs_media *media,
+ size_t offset, size_t count) {
+ void *address = buffer->buffer + buffer->allocated;;
+ DEBUG("simple_buffer_map(offset=%d, count=%d): "
+ "allocated=%d, size=%d, last_allocate=%d\n",
+ offset, count, buffer->allocated, buffer->size,
+ buffer->last_allocate);
+ if (buffer->allocated + count >= buffer->size)
+ return CBFS_MEDIA_INVALID_MAP_ADDRESS;
+ if (media->read(media, address, offset, count) != count) {
+ ERROR("simple_buffer: fail to read %zd bytes from 0x%zx\n",
+ count, offset);
+ return CBFS_MEDIA_INVALID_MAP_ADDRESS;
+ }
+ buffer->allocated += count;
+ buffer->last_allocate = count;
+ return address;
+}
+
+void *cbfs_simple_buffer_unmap(struct cbfs_simple_buffer *buffer,
+ const void *address) {
+ // TODO Add simple buffer management so we can free more than last
+ // allocated one.
+ DEBUG("simple_buffer_unmap(address=0x%p): "
+ "allocated=%d, size=%d, last_allocate=%d\n",
+ address, buffer->allocated, buffer->size,
+ buffer->last_allocate);
+ if ((buffer->buffer + buffer->allocated - buffer->last_allocate) ==
+ address) {
+ buffer->allocated -= buffer->last_allocate;
+ buffer->last_allocate = 0;
+ }
+ return NULL;
+}
+
+/**
+ * run_address is passed the address of a function taking no parameters and
+ * jumps to it, returning the result.
+ * @param f the address to call as a function.
+ * @return value returned by the function.
+ */
+
+int run_address(void *f)
{
- virt_to_phys = host_virt_to_phys;
- phys_to_virt = host_phys_to_virt;
+ int (*v) (void);
+ v = f;
+ return v();
}
+
+#endif
diff --git a/payloads/libpayload/libcbfs/cbfs_core.c b/payloads/libpayload/libcbfs/cbfs_core.c
index 4bf755b0f8..4fecd40370 100644
--- a/payloads/libpayload/libcbfs/cbfs_core.c
+++ b/payloads/libpayload/libcbfs/cbfs_core.c
@@ -2,6 +2,7 @@
* This file is part of the libpayload project.
*
* Copyright (C) 2011 secunet Security Networks AG
+ * Copyright (C) 2013 Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -27,119 +28,153 @@
* SUCH DAMAGE.
*/
-/* The CBFS core requires a couple of #defines or functions to adapt it to the target environment:
+/* The CBFS core requires a couple of #defines or functions to adapt it to the
+ * target environment:
*
* CBFS_CORE_WITH_LZMA (must be #define)
* if defined, ulzma() must exist for decompression of data streams
*
- * phys_to_virt(x), virt_to_phys(x)
- * translate physical addresses to virtual and vice versa
- * can be idempotent if no mapping is necessary.
+ * CBFS_HEADER_ROM_ADDRESS
+ * ROM address (offset) of CBFS header. Underlying CBFS media may interpret
+ * it in other way so we call this "address".
*
* ERROR(x...)
* print an error message x (in printf format)
*
* LOG(x...)
- * print a debug message x (in printf format)
+ * print a message x (in printf format)
*
- * romstart()
- * returns the start address of the ROM image, or 0xffffffff if ROM is
- * top-aligned. This is a physical address.
+ * DEBUG(x...)
+ * print a debug message x (in printf format)
*
- * romend()
- * returns the highest address of the ROM image + 1, for use if
- * romstart() == 0xffffffff. This is a physical address.
*/
-#include <cbfs_core.h>
+#include <cbfs.h>
+#include <string.h>
-
-/* returns pointer to master header or 0xffffffff if not found */
-struct cbfs_header *get_cbfs_header(void)
+/* returns a pointer to CBFS master header, or CBFS_HEADER_INVALID_ADDRESS
+ * on failure */
+const struct cbfs_header *cbfs_get_header(struct cbfs_media *media)
{
- struct cbfs_header *header;
-
- /* find header */
- if (romstart() == 0xffffffff) {
- header = (struct cbfs_header*)phys_to_virt(*(uint32_t*)phys_to_virt(romend() + CBFS_HEADPTR_ADDR));
- } else {
- // FIXME: where's the master header on ARM (our current bottom-aligned platform)?
- header = NULL;
+ const struct cbfs_header *header;
+ struct cbfs_media default_media;
+
+ if (media == CBFS_DEFAULT_MEDIA) {
+ media = &default_media;
+ if (init_default_cbfs_media(media) != 0) {
+ ERROR("Failed to initializee default media.\n");
+ return NULL;
+ }
+ }
+
+ media->open(media);
+ DEBUG("CBFS_HEADER_ROM_ADDRESS: 0x%x/0x%x\n", CBFS_HEADER_ROM_ADDRESS,
+ CONFIG_ROM_SIZE);
+ header = media->map(media, CBFS_HEADER_ROM_ADDRESS, sizeof(*header));
+ media->close(media);
+
+ if (header == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
+ ERROR("Failed to load CBFS header from 0x%x\n",
+ CBFS_HEADER_ROM_ADDRESS);
+ return CBFS_HEADER_INVALID_ADDRESS;
}
+
if (CBFS_HEADER_MAGIC != ntohl(header->magic)) {
- ERROR("Could not find valid CBFS master header at %p: %x vs %x.\n", header, CBFS_HEADER_MAGIC, ntohl(header->magic));
+ ERROR("Could not find valid CBFS master header at %x: "
+ "%x vs %x.\n", CBFS_HEADER_ROM_ADDRESS, CBFS_HEADER_MAGIC,
+ ntohl(header->magic));
if (header->magic == 0xffffffff) {
ERROR("Maybe ROM is not mapped properly?\n");
}
- return (void*)0xffffffff;
+ return CBFS_HEADER_INVALID_ADDRESS;
}
return header;
}
-// by must be power-of-two
-#define CBFS_ALIGN(val, by) (typeof(val))((uint32_t)(val + by - 1) & (uint32_t)~(by - 1))
-#define CBFS_ALIGN_UP(val, by) CBFS_ALIGN(val + 1, by)
-
/* public API starts here*/
-struct cbfs_file *cbfs_find(const char *name)
+struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name)
{
- struct cbfs_header *header = get_cbfs_header();
- if (header == (void*)0xffffffff) return NULL;
-
- LOG("Searching for %s\n", name);
-
- void *data, *dataend, *origdata;
- /* find first entry */
- if (romstart() == 0xffffffff) {
- data = (void*)phys_to_virt(romend()) - ntohl(header->romsize) + ntohl(header->offset);
- dataend = (void*)phys_to_virt(romend());
- } else {
- data = (void*)phys_to_virt(romstart()) + ntohl(header->offset);
- dataend = (void*)phys_to_virt(romstart()) + ntohl(header->romsize);
- }
- dataend -= ntohl(header->bootblocksize);
-
- int align = ntohl(header->align);
-
- origdata = data;
- while ((data < (dataend - 1)) && (data >= origdata)) {
- struct cbfs_file *file = data;
- if (memcmp(CBFS_FILE_MAGIC, file->magic, strlen(CBFS_FILE_MAGIC)) != 0) {
- // no file header found. corruption?
- // proceed in aligned steps to resynchronize
- LOG("ERROR: No file header found at %p, attempting to recover by searching for header\n", data);
- data = phys_to_virt(CBFS_ALIGN_UP(virt_to_phys(data), align));
- continue;
- }
- LOG("Check %s\n", CBFS_NAME(file));
- if (strcmp(CBFS_NAME(file), name) == 0) {
- return file;
- }
- void *olddata = data;
- data = phys_to_virt(CBFS_ALIGN(virt_to_phys(data) + ntohl(file->len) + ntohl(file->offset), align));
- if (olddata > data) {
- LOG("Something is wrong here. File chain moved from %p to %p\n", olddata, data);
+ const char *file_name;
+ uint32_t offset, align, romsize, name_len;
+ const struct cbfs_header *header;
+ struct cbfs_file file, *file_ptr;
+ struct cbfs_media default_media;
+
+ if (media == CBFS_DEFAULT_MEDIA) {
+ media = &default_media;
+ if (init_default_cbfs_media(media) != 0) {
+ ERROR("Failed to initializee default media.\n");
return NULL;
}
}
- return NULL;
-}
-
-void *cbfs_get_file(const char *name)
-{
- struct cbfs_file *file = cbfs_find(name);
- if (file == NULL) {
- ERROR("Could not find file '%s'.\n", name);
+ if (CBFS_HEADER_INVALID_ADDRESS == (header = cbfs_get_header(media)))
return NULL;
- }
- return (void*)CBFS_SUBHEADER(file);
+ // Logical offset (for source media) of first file.
+ offset = ntohl(header->offset);
+ align = ntohl(header->align);
+ romsize = ntohl(header->romsize);
+
+ // TODO header->romsize seems broken now on ARM. Remove this when it's
+ // fixed.
+#if defined(CONFIG_ARCH_ARMV7) && CONFIG_ARCH_ARMV7
+ romsize = CONFIG_ROM_SIZE;
+#endif
+ DEBUG("offset: 0x%x, align: %d, romsize: %d\n", offset, align, romsize);
+
+ LOG("Looking for '%s' starting from 0x%x.\n", name, offset);
+ media->open(media);
+ while (offset < romsize &&
+ media->read(media, &file, offset, sizeof(file)) == sizeof(file)) {
+ if (memcmp(CBFS_FILE_MAGIC, file.magic,
+ sizeof(file.magic)) != 0) {
+ uint32_t new_align = align;
+ if (offset % align)
+ new_align += align - (offset % align);
+ ERROR("ERROR: No file header found at 0x%xx - "
+ "try next aligned address: 0x%x.\n", offset,
+ offset + new_align);
+ offset += new_align;
+ continue;
+ }
+ name_len = ntohl(file.offset) - sizeof(file);
+ DEBUG(" - load entry 0x%x file name (%d bytes)...\n", offset,
+ name_len);
+
+ // load file name (arbitrary length).
+ file_name = (const char*)media->map(
+ media, offset + sizeof(file), name_len);
+ if (file_name == CBFS_MEDIA_INVALID_MAP_ADDRESS) {
+ ERROR("ERROR: Failed to get filename: 0x%x.\n", offset);
+ } else if (strcmp(file_name, name) == 0) {
+ int file_offset = ntohl(file.offset),
+ file_len = ntohl(file.len);
+ LOG("Found file (offset=0x%x, len=%d).\n",
+ offset + file_offset, file_len);
+ media->unmap(media, file_name);
+ file_ptr = media->map(media, offset,
+ file_offset + file_len);
+ media->close(media);
+ return file_ptr;
+ } else {
+ LOG(" (unmatched file @0x%x: %s)\n", offset, file_name);
+ media->unmap(media, file_name);
+ }
+
+ // Move to next file.
+ offset += ntohl(file.len) + ntohl(file.offset);
+ if (offset % align)
+ offset += align - (offset % align);
+ }
+ media->close(media);
+ ERROR("ERROR: Not found.\n");
+ return NULL;
}
-void *cbfs_find_file(const char *name, int type)
+void *cbfs_get_file_content(struct cbfs_media *media, const char *name, int type)
{
- struct cbfs_file *file = cbfs_find(name);
+ struct cbfs_file *file = cbfs_get_file(media, name);
if (file == NULL) {
ERROR("Could not find file '%s'.\n", name);
@@ -147,7 +182,8 @@ void *cbfs_find_file(const char *name, int type)
}
if (ntohl(file->type) != type) {
- ERROR("File '%s' is of type %x, but we requested %x.\n", name, ntohl(file->type), type);
+ ERROR("File '%s' is of type %x, but we requested %x.\n", name,
+ ntohl(file->type), type);
return NULL;
}
@@ -168,7 +204,9 @@ int cbfs_decompress(int algo, void *src, void *dst, int len)
return -1;
#endif
default:
- ERROR("tried to decompress %d bytes with algorithm #%x, but that algorithm id is unsupported.\n", len, algo);
+ ERROR("tried to decompress %d bytes with algorithm #%x,"
+ "but that algorithm id is unsupported.\n", len,
+ algo);
return -1;
}
}
diff --git a/payloads/libpayload/libcbfs/ram_media.c b/payloads/libpayload/libcbfs/ram_media.c
new file mode 100644
index 0000000000..87b5292b63
--- /dev/null
+++ b/payloads/libpayload/libcbfs/ram_media.c
@@ -0,0 +1,114 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2013 Google, 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 <cbfs.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+// Implementation of a media source based on given memory buffer.
+struct ram_media {
+ char *start;
+ size_t size;
+};
+
+static int ram_open(struct cbfs_media *media) {
+ return 0;
+}
+
+static void *ram_map(struct cbfs_media *media, size_t offset, size_t count) {
+ struct ram_media *m = (struct ram_media*)media->context;
+ if (offset + count >= m->size) {
+ printf("ERROR: ram_map: request out of range (0x%x+0x%x)\n",
+ offset, count);
+ return NULL;
+ }
+ return (void*)(m->start + offset);
+}
+
+static void *ram_unmap(struct cbfs_media *media, const void *address) {
+ return NULL;
+}
+
+static size_t ram_read(struct cbfs_media *media, void *dest, size_t offset,
+ size_t count) {
+ void *ptr = ram_map(media, offset, count);
+ memcpy(dest, ptr, count);
+ ram_unmap(media, ptr);
+ return count;
+}
+
+static int ram_close(struct cbfs_media *media) {
+ return 0;
+}
+
+int init_cbfs_ram_media(struct cbfs_media *media, void *start, size_t size);
+int init_cbfs_ram_media(struct cbfs_media *media, void *start, size_t size) {
+ // TODO Find a way to release unused media. Maybe adding media->destroy.
+ struct ram_media *m = (struct ram_media*)malloc(sizeof(*m));
+ m->start = start;
+ m->size = size;
+ media->context = (void*)m;
+ media->open = ram_open;
+ media->close = ram_close;
+ media->map = ram_map;
+ media->unmap = ram_unmap;
+ media->read = ram_read;
+ return 0;
+}
+
+// Legacy setup_cbfs_from_*.
+static int is_default_cbfs_media_initialized;
+static struct cbfs_media default_cbfs_media;
+
+int setup_cbfs_from_ram(void *start, uint32_t size);
+int setup_cbfs_from_ram(void *start, uint32_t size) {
+ int result = init_cbfs_ram_media(&default_cbfs_media, start, size);
+ if (result == 0)
+ is_default_cbfs_media_initialized = 1;
+ return result;
+}
+
+extern int libpayload_init_default_cbfs_media(struct cbfs_media *media);
+int setup_cbfs_from_flash(void);
+int setup_cbfs_from_flash(void) {
+ int result = libpayload_init_default_cbfs_media(&default_cbfs_media);
+ if (result == 0)
+ is_default_cbfs_media_initialized = 1;
+ return result;
+}
+
+int init_default_cbfs_media(struct cbfs_media *media) {
+ int result = 0;
+ if (is_default_cbfs_media_initialized != 1) {
+ result = setup_cbfs_from_flash();
+ }
+ if (result == 0)
+ memcpy(media, &default_cbfs_media, sizeof(*media));
+ return result;
+}