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cgptlib: Add functions to cgptlib API

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Following changes are done to the cgptlib API in order to allow backend
component of fastboot to perform erase and write operations on
partitions and manipulate GPT entries:
GptFindNthEntry - Returns the nth entry in GPT that matches provided
GUID.
GptGetEntrySizeLba - Returns size of a partition in lba.
GptGetEntrySizeBytes - Returns size of a partition in bytes.
GptUpdateKernelWithEntry - Given kernel entry is updated using the
provided update_type. GptUpdateKernelEntry calls this function with
entry for current_kernel.

Add flags GPT_UPDATE_ENTRY_RESET and GPT_UPDATE_ENTRY_INVALID for
calls to GptUpdateKernelEntry. These operations are used by write
image and erase partition respectively.

BUG=chrome-os-partner:35861
BRANCH=None
TEST=Compiles successfully and all the newly added functions work as expected.

Change-Id: I82c87e4c97de2d207e80209dbd4922b4bcd5880a
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://chromium-review.googlesource.com/240268
Trybot-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>
This commit is contained in:
Furquan Shaikh
2015-01-12 14:54:04 -08:00
committed by ChromeOS Commit Bot
parent f1f53b3732
commit f620c0d656
4 changed files with 136 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
firmware/include/gpt_misc.h
View File

@@ -50,6 +50,16 @@ enum {
* entry as invalid.
*/
GPT_UPDATE_ENTRY_BAD = 2,
/*
* Used for fastboot mode. When an image is written to kernel partition,
* its GPT entry is marked with S1,P1,T15.
*/
GPT_UPDATE_ENTRY_RESET = 3,
/*
* Used for fastboot mode. When an image is written to kernel partition,
* its GPT entry is marked with S0,P0,T0.
*/
GPT_UPDATE_ENTRY_INVALID = 4,
};
/* If this bit is 1, the GPT is stored in another from the streaming data */
@@ -129,6 +139,13 @@ typedef struct {
* small) */
int GptInit(GptData *gpt);
/**
* Return the nth instance of parition entry matching the partition type guid
* from the gpt table. Instance value starts from 0. If the entry is not found,
* it returns NULL.
*/
GptEntry *GptFindNthEntry(GptData *gpt, const Guid *guid, unsigned int n);
/**
* Allocate and read GPT data from the drive. The sector_bytes and
* drive_sectors fields should be filled on input. The primary and secondary
@@ -148,4 +165,35 @@ int WriteAndFreeGptData(VbExDiskHandle_t disk_handle, GptData *gptdata);
*/
int IsUnusedEntry(const GptEntry *e);
/**
* Return size(in lba) of a partition represented by given GPT entry.
*/
size_t GptGetEntrySizeLba(const GptEntry *e);
/**
* Return size(in bytes) of a partition represented by given GPT entry.
*/
size_t GptGetEntrySizeBytes(const GptData *gpt, const GptEntry *e);
/**
* Updates the kernel entry with the specified index, using the specified type
* of update (GPT_UPDATE_ENTRY_*).
*
* On return the modified field may be set, if the GPT data has been modified
* and should be written to disk.
*
* Returns GPT_SUCCESS if successful, else
* GPT_ERROR_INVALID_UPDATE_TYPE, invalid 'update_type' is given.
*/
int GptUpdateKernelWithEntry(GptData *gpt, GptEntry *e, uint32_t update_type);
/**
* Updates the kernel entry identified by current_kernel field. If
* current_kernel is not set it returns an error.
*
* Returns GPT_SUCCESS if successful, else
* GPT_ERROR_INVALID_UPDATE_TYPE, invalid 'update_type' is given.
*/
int GptUpdateKernelEntry(GptData *gpt, uint32_t update_type);
#endif /* VBOOT_REFERENCE_CGPT_MISC_H_ */