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Add misc_writer.

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bootloader_message.h currently divides /misc into four segments. The
space between 2K and 16K is reserved for vendor use (e.g. bootloader
persists flags). This CL adds a vendor tool "misc_writer", to allow
writing data to the vendor space in /misc, before getting a dedicated
HAL for accessing /misc partition (b/131775112).

Targets need to explicitly include the module, then invoke the
executable to write data. For example, the following command will write
3-byte data ("0xABCDEF") to offset 4 in vendor space (i.e. 2048 + 4 in
/misc).
$ /vendor/bin/misc_writer --vendor-space-offset 4 --hex-string 0xABCDEF

Bug: 132906936
Test: Run recovery_unit_test on crosshatch.
Test: Call the command via init.hardware.rc on crosshatch. Check that
      the call finishes successfully. Then check the contents written to
      /misc (`dd bs=1 skip=2048 if=/dev/block/sda2 count=32 | xxd`).
Change-Id: I79548fc63fc79b705a0320868690569c3106949f
Merged-In: I79548fc63fc79b705a0320868690569c3106949f
(cherry picked from commit 7ae0169842)
This commit is contained in:
Tao Bao
2019-05-16 14:42:42 -07:00
parent 9681eef5ff
commit 35e0f6d290
6 changed files with 258 additions and 6 deletions
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bootloader_message/include/bootloader_message/bootloader_message.h
+11 -2
View File
@@ -28,8 +28,9 @@
// 16K - 64K Used by uncrypt and recovery to store wipe_package for A/B devices
// Note that these offsets are admitted by bootloader,recovery and uncrypt, so they
// are not configurable without changing all of them.
static const size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = 0;
static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024;
constexpr size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = 0;
constexpr size_t VENDOR_SPACE_OFFSET_IN_MISC = 2 * 1024;
constexpr size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024;
/* Bootloader Message (2-KiB)
*
@@ -228,6 +229,14 @@ bool read_wipe_package(std::string* package_data, size_t size, std::string* err)
// Write the wipe package into BCB (to offset WIPE_PACKAGE_OFFSET_IN_MISC).
bool write_wipe_package(const std::string& package_data, std::string* err);
// Reads data from the vendor space in /misc partition, with the given offset and size. Note that
// offset is in relative to the start of vendor space.
bool ReadMiscPartitionVendorSpace(void* data, size_t size, size_t offset, std::string* err);
// Writes the given data to the vendor space in /misc partition, at the given offset. Note that
// offset is in relative to the start of the vendor space.
bool WriteMiscPartitionVendorSpace(const void* data, size_t size, size_t offset, std::string* err);
#else
#include <stdbool.h>