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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

20
firmware/lib/gpt_misc.c
View File

@@ -201,3 +201,23 @@ int IsUnusedEntry(const GptEntry *e)
static Guid zero = {{{0, 0, 0, 0, 0, {0, 0, 0, 0, 0, 0}}}};
return !Memcmp(&zero, (const uint8_t*)(&e->type), sizeof(zero));
}
/*
* Func: GptGetEntrySize
* Desc: This function returns size(in lba) of a partition represented by
* given GPT entry.
*/
size_t GptGetEntrySizeLba(const GptEntry *e)
{
return (e->ending_lba - e->starting_lba + 1);
}
/*
* Func: GptGetEntrySize
* Desc: This function returns size(in bytes) of a partition represented by
* given GPT entry.
*/
size_t GptGetEntrySizeBytes(const GptData *gpt, const GptEntry *e)
{
return GptGetEntrySizeLba(e) * gpt->sector_bytes;
}