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https://github.com/Telecominfraproject/OpenCellular.git
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72e344d5cd
This started out as a simple fix for a minor bug and turned into a nearly complete rewrite. Now that it's done I'm not sure it really matters. This version is a lot cleaner about handling command-line args, but isn't otherwise noticeably better. Sigh. BUG=none TEST=manual make make runtests Change-Id: I9c194e9c0e6418488635989ef666bc83c6e39816 Reviewed-on: https://gerrit.chromium.org/gerrit/18268 Commit-Ready: Bill Richardson <wfrichar@chromium.org> Tested-by: Bill Richardson <wfrichar@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org>
86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Exports the kernel commandline from a given partition/image.
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*/
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#include "dump_kernel_config.h"
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#include <stdio.h>
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#include <sys/mman.h>
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#include "host_common.h"
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#include "kernel_blob.h"
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uint8_t* find_kernel_config(uint8_t* blob, uint64_t blob_size,
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uint64_t kernel_body_load_address) {
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VbKeyBlockHeader* key_block;
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VbKernelPreambleHeader* preamble;
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struct linux_kernel_params *params;
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uint32_t now = 0;
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uint32_t offset = 0;
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/* Skip the key block */
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key_block = (VbKeyBlockHeader*)blob;
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now += key_block->key_block_size;
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if (now + blob > blob + blob_size) {
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VbExError("key_block_size advances past the end of the blob\n");
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return NULL;
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}
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/* Open up the preamble */
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preamble = (VbKernelPreambleHeader*)(blob + now);
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now += preamble->preamble_size;
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if (now + blob > blob + blob_size) {
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VbExError("preamble_size advances past the end of the blob\n");
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return NULL;
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}
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/* The x86 kernels have a pointer to the kernel commandline in the zeropage
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* table, but that's irrelevant for ARM. Both types keep the config blob in
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* the same place, so just go find it. */
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offset = preamble->bootloader_address -
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(kernel_body_load_address + CROS_PARAMS_SIZE +
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CROS_CONFIG_SIZE) + now;
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if (offset > blob_size) {
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VbExError("params are outside of the memory blob: %x\n", offset);
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return NULL;
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}
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return blob + offset;
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}
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void* MapFile(const char* filename, size_t *size) {
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FILE* f;
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uint8_t* buf;
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long file_size = 0;
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f = fopen(filename, "rb");
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if (!f) {
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VBDEBUG(("Unable to open file %s\n", filename));
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return NULL;
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}
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fseek(f, 0, SEEK_END);
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file_size = ftell(f);
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rewind(f);
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if (file_size <= 0) {
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fclose(f);
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return NULL;
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}
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*size = (size_t) file_size;
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/* Uses a host primitive as this is not meant for firmware use. */
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buf = mmap(NULL, *size, PROT_READ, MAP_PRIVATE, fileno(f), 0);
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if (buf == MAP_FAILED) {
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VbExError("Failed to mmap the file %s\n", filename);
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fclose(f);
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return NULL;
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}
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fclose(f);
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return buf;
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}
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