--- /dev/null
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2011 secunet Security Networks AG
+ *
+ * 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.
+ */
+
+/* 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.
+ *
+ * ERROR(x...)
+ * print an error message x (in printf format)
+ *
+ * LOG(x...)
+ * print a debug 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.
+ *
+ * romend()
+ * returns the highest address of the ROM image + 1, for use if
+ * romstart() == 0xffffffff. This is a physical address.
+ */
+
+#include <cbfs_core.h>
+
+
+/* returns pointer to master header or 0xffffffff if not found */
+static struct cbfs_header *get_cbfs_header(void)
+{
+ 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;
+ }
+ 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));
+ if (header->magic == 0xffffffff) {
+ ERROR("Maybe ROM is not mapped properly?\n");
+ }
+ return (void*)0xffffffff;
+ }
+ 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_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);
+ }
+
+ 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("No file header found at %p, 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);
+ 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);
+ return NULL;
+ }
+
+ return (void*)CBFS_SUBHEADER(file);
+}
+
+void *cbfs_find_file(const char *name, int type)
+{
+ struct cbfs_file *file = cbfs_find(name);
+
+ if (file == NULL) {
+ ERROR("Could not find file '%s'.\n", name);
+ return NULL;
+ }
+
+ if (ntohl(file->type) != type) {
+ ERROR("File '%s' is of type %x, but we requested %x.\n", name, ntohl(file->type), type);
+ return NULL;
+ }
+
+ return (void*)CBFS_SUBHEADER(file);
+}
+
+int cbfs_decompress(int algo, void *src, void *dst, int len)
+{
+ switch (algo) {
+ case CBFS_COMPRESS_NONE:
+ memcpy(dst, src, len);
+ return 0;
+#ifdef CBFS_CORE_WITH_LZMA
+ case CBFS_COMPRESS_LZMA:
+ if (ulzma(src, dst) != 0) {
+ return 0;
+ }
+ return -1;
+#endif
+ default:
+ ERROR("tried to decompress %d bytes with algorithm #%x, but that algorithm id is unsupported.\n", len, algo);
+ return -1;
+ }
+}
+
projects / coreboot.git / blobdiff