mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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0c3ba249ab
This reduces the number of exported header files to the minimum needed by
the existing userspace utilities and firmware implementations.
BUG=chromium:221544
BRANCH=none
TEST=manual, trybots
CQ-DEPEND=CL:47019,CL:47022,CL:47023
sudo FEATURES=test emerge vboot_reference
FEATURES=test emerge-$BOARD \
vboot_reference \
chromeos-cryptohome \
chromeos-installer \
chromeos-u-boot \
peach-u-boot \
depthcharge
Change-Id: I2946cc2dbaf5459a6c5eca92ca57d546498e6d85
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/47021
Reviewed-by: Randall Spangler <rspangler@chromium.org>
120 lines
3.0 KiB
C
120 lines
3.0 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 <stdio.h>
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#include <string.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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#include "vboot_api.h"
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#include "vboot_host.h"
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static uint8_t* GetKernelConfig(uint8_t* blob, size_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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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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/* Read body_load_address from preamble if no kernel_body_load_address */
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if (kernel_body_load_address == USE_PREAMBLE_LOAD_ADDR)
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kernel_body_load_address = preamble->body_load_address;
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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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static void* MMapFile(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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char *FindKernelConfig(const char *infile, uint64_t kernel_body_load_address)
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{
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uint8_t* blob;
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size_t blob_size;
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uint8_t *config = NULL;
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char *newstr = NULL;
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blob = MMapFile(infile, &blob_size);
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if (!blob) {
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VbExError("Error reading input file\n");
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return 0;
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}
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config = GetKernelConfig(blob, blob_size, kernel_body_load_address);
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if (!config) {
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VbExError("Error parsing input file\n");
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munmap(blob, blob_size);
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return 0;
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}
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newstr = strndup((char *)config, CROS_CONFIG_SIZE);
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if (!newstr)
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VbExError("Can't allocate new string\n");
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munmap(blob, blob_size);
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return newstr;
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}
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