117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2013 Google, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <cbfs.h>
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#include <cbfs_ram.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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// Implementation of a media source based on given memory buffer.
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struct ram_media {
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char *start;
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size_t size;
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};
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static int ram_open(struct cbfs_media *media) {
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return 0;
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}
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static void *ram_map(struct cbfs_media *media, size_t offset, size_t count) {
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struct ram_media *m = (struct ram_media*)media->context;
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/* assume addressing from top of image in this case */
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if (offset > 0xf0000000) {
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offset = m->size + offset;
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}
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if (offset + count > m->size) {
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printf("ERROR: ram_map: request out of range (0x%zx+0x%zx)\n",
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offset, count);
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return NULL;
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}
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return (void*)(m->start + offset);
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}
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static void *ram_unmap(struct cbfs_media *media, const void *address) {
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return NULL;
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}
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static size_t ram_read(struct cbfs_media *media, void *dest, size_t offset,
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size_t count) {
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void *ptr = ram_map(media, offset, count);
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memcpy(dest, ptr, count);
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ram_unmap(media, ptr);
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return count;
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}
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static int ram_close(struct cbfs_media *media) {
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return 0;
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}
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int init_cbfs_ram_media(struct cbfs_media *media, void *start, size_t size) {
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// TODO Find a way to release unused media. Maybe adding media->destroy.
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struct ram_media *m = (struct ram_media*)malloc(sizeof(*m));
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m->start = start;
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m->size = size;
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media->context = (void*)m;
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media->open = ram_open;
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media->close = ram_close;
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media->map = ram_map;
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media->unmap = ram_unmap;
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media->read = ram_read;
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return 0;
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}
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// Legacy setup_cbfs_from_*.
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static int is_default_cbfs_media_initialized;
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static struct cbfs_media default_cbfs_media;
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int setup_cbfs_from_ram(void *start, uint32_t size) {
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int result = init_cbfs_ram_media(&default_cbfs_media, start, size);
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if (result == 0)
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is_default_cbfs_media_initialized = 1;
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return result;
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}
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extern int libpayload_init_default_cbfs_media(struct cbfs_media *media);
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int setup_cbfs_from_flash(void) {
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int result = libpayload_init_default_cbfs_media(&default_cbfs_media);
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if (result == 0)
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is_default_cbfs_media_initialized = 1;
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return result;
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}
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int init_default_cbfs_media(struct cbfs_media *media) {
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int result = 0;
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if (is_default_cbfs_media_initialized != 1) {
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result = setup_cbfs_from_flash();
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}
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if (result == 0)
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memcpy(media, &default_cbfs_media, sizeof(*media));
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return result;
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}
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