mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2025-11-27 03:33:50 +00:00
036922ed8a
The default behavior of dump_kernel_config is changed from using CROS_32BIT_ENTRY_ADDR to reading from kernel preamble. The main motivation for this change is in preparation for ARM boards of which kernel body load address cannot be CROS_32BIT_ENTRY_ADDR. Since we do not want that all ARM calling sides of dump_kernel_config have to carry the kloadaddr argument, it would be better to let dump_kernel_config read this address from the kernel preamble by default. BUG=chromium-os:28077 TEST=Run dump_kernel_config w/ and w/o this change Change-Id: I5eddcc35e5970dfce02cc66208438c57351f1c81 Reviewed-on: https://gerrit.chromium.org/gerrit/19660 Tested-by: Che-Liang Chiou <clchiou@chromium.org> Reviewed-by: Don Garrett <dgarrett@chromium.org> Reviewed-by: Bill Richardson <wfrichar@chromium.org> Commit-Ready: Che-Liang Chiou <clchiou@chromium.org>
90 lines
2.4 KiB
C
90 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;
|
|
}
|
|
|
|
/* Read body_load_address from preamble if no kernel_body_load_address */
|
|
if (kernel_body_load_address == CROS_NO_ENTRY_ADDR)
|
|
kernel_body_load_address = preamble->body_load_address;
|
|
|
|
/* The x86 kernels have a pointer to the kernel commandline in the zeropage
|
|
* table, but that's irrelevant for ARM. Both types keep the config blob in
|
|
* the same place, so just go find it. */
|
|
offset = preamble->bootloader_address -
|
|
(kernel_body_load_address + CROS_PARAMS_SIZE +
|
|
CROS_CONFIG_SIZE) + now;
|
|
if (offset > blob_size) {
|
|
VbExError("params are 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;
|
|
}
|