| /* 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 <stdio.h> |
| #include <sys/mman.h> |
| |
| #include "dump_kernel_config.h" |
| #include "host_common.h" |
| #include "kernel_blob.h" |
| #include "vboot_api.h" |
| |
| uint8_t* find_kernel_config(uint8_t* blob, uint64_t blob_size, |
| uint64_t kernel_body_load_address) { |
| |
| VbKeyBlockHeader* key_block; |
| VbKernelPreambleHeader* preamble; |
| 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; |
| } |