mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2025-11-24 10:14:55 +00:00
0fc9594634
export them as a library to be used by post installer programs. A matching change to vboot_reference-9999.ebuild is also required. TEST=Built, verified library symbols with nm on x86-mario, amd64-generic. BUG=chromium-os:25381 Change-Id: Icb23838a8cd804e0c66718c6d4d60f639ee6b72f Reviewed-on: https://gerrit.chromium.org/gerrit/14770 Commit-Ready: Don Garrett <dgarrett@chromium.org> Reviewed-by: Don Garrett <dgarrett@chromium.org> Tested-by: Don Garrett <dgarrett@chromium.org>
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*
|
|
* Exports the kernel commandline from a given partition/image.
|
|
*/
|
|
|
|
#include "dump_kernel_config.h"
|
|
|
|
#include <stdio.h>
|
|
#include <sys/mman.h>
|
|
|
|
#include "host_common.h"
|
|
#include "kernel_blob.h"
|
|
|
|
uint8_t* find_kernel_config(uint8_t* blob, uint64_t blob_size,
|
|
uint64_t kernel_body_load_address) {
|
|
|
|
VbKeyBlockHeader* key_block;
|
|
VbKernelPreambleHeader* preamble;
|
|
struct linux_kernel_params *params;
|
|
uint32_t now = 0;
|
|
uint32_t offset = 0;
|
|
|
|
/* Skip the key block */
|
|
key_block = (VbKeyBlockHeader*)blob;
|
|
now += key_block->key_block_size;
|
|
if (now + blob > blob + blob_size) {
|
|
VbExError("key_block_size advances past the end of the blob\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* Open up the preamble */
|
|
preamble = (VbKernelPreambleHeader*)(blob + now);
|
|
now += preamble->preamble_size;
|
|
if (now + blob > blob + blob_size) {
|
|
VbExError("preamble_size advances past the end of the blob\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* The parameters are packed before the bootloader and there is no specific
|
|
* pointer to it so we just walk back by its allocated size. */
|
|
offset = preamble->bootloader_address -
|
|
(kernel_body_load_address + CROS_PARAMS_SIZE) + now;
|
|
if (offset > blob_size) {
|
|
VbExError("params are outside of the memory blob: %x\n", offset);
|
|
return NULL;
|
|
}
|
|
params = (struct linux_kernel_params *)(blob + offset);
|
|
|
|
/* Grab the offset to the kernel command line using the supplied pointer. */
|
|
offset = params->cmd_line_ptr - kernel_body_load_address + now;
|
|
if (offset > blob_size) {
|
|
VbExError("cmdline is outside of the memory blob: %x\n", offset);
|
|
return NULL;
|
|
}
|
|
return blob + offset;
|
|
}
|
|
|
|
void* MapFile(const char* filename, size_t *size) {
|
|
FILE* f;
|
|
uint8_t* buf;
|
|
long file_size = 0;
|
|
|
|
f = fopen(filename, "rb");
|
|
if (!f) {
|
|
VBDEBUG(("Unable to open file %s\n", filename));
|
|
return NULL;
|
|
}
|
|
|
|
fseek(f, 0, SEEK_END);
|
|
file_size = ftell(f);
|
|
rewind(f);
|
|
|
|
if (file_size <= 0) {
|
|
fclose(f);
|
|
return NULL;
|
|
}
|
|
*size = (size_t) file_size;
|
|
|
|
/* Uses a host primitive as this is not meant for firmware use. */
|
|
buf = mmap(NULL, *size, PROT_READ, MAP_PRIVATE, fileno(f), 0);
|
|
if (buf == MAP_FAILED) {
|
|
VbExError("Failed to mmap the file %s\n", filename);
|
|
fclose(f);
|
|
return NULL;
|
|
}
|
|
|
|
fclose(f);
|
|
return buf;
|
|
}
|