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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

73
firmware/lib/cgptlib/cgptlib.c
View File

@@ -112,14 +112,15 @@ int GptNextKernelEntry(GptData *gpt, uint64_t *start_sector, uint64_t *size)
return GPT_SUCCESS;
}
int GptUpdateKernelEntry(GptData *gpt, uint32_t update_type)
/*
* Func: GptUpdateKernelWithEntry
* Desc: This function updates the given kernel entry according to the provided
* update_type.
*/
int GptUpdateKernelWithEntry(GptData *gpt, GptEntry *e, uint32_t update_type)
{
GptEntry *entries = (GptEntry *)gpt->primary_entries;
GptEntry *e = entries + gpt->current_kernel;
int modified = 0;
if (gpt->current_kernel == CGPT_KERNEL_ENTRY_NOT_FOUND)
return GPT_ERROR_INVALID_UPDATE_TYPE;
if (!IsKernelEntry(e))
return GPT_ERROR_INVALID_UPDATE_TYPE;
@@ -156,6 +157,28 @@ int GptUpdateKernelEntry(GptData *gpt, uint32_t update_type)
}
break;
}
case GPT_UPDATE_ENTRY_RESET: {
/*
* Used for fastboot mode. If image is written to kernel
* partition, its GPT entry is marked with S1,P1,T15
*/
modified = 1;
SetEntryTries(e, 15);
SetEntryPriority(e, 1);
SetEntrySuccessful(e, 1);
break;
}
case GPT_UPDATE_ENTRY_INVALID: {
/*
* Used for fastboot mode. If kernel partition is erased, its
* GPT entry is marked with S0,P0,T0
*/
modified = 1;
SetEntryTries(e, 0);
SetEntryPriority(e, 0);
SetEntrySuccessful(e, 0);
break;
}
default:
return GPT_ERROR_INVALID_UPDATE_TYPE;
}
@@ -166,3 +189,43 @@ int GptUpdateKernelEntry(GptData *gpt, uint32_t update_type)
return GPT_SUCCESS;
}
/*
* Func: GptUpdateKernelEntry
* Desc: This function updates current_kernel entry with provided
* update_type. If current_kernel is not set, then it returns error.
*/
int GptUpdateKernelEntry(GptData *gpt, uint32_t update_type)
{
GptEntry *entries = (GptEntry *)gpt->primary_entries;
GptEntry *e = entries + gpt->current_kernel;
if (gpt->current_kernel == CGPT_KERNEL_ENTRY_NOT_FOUND)
return GPT_ERROR_INVALID_UPDATE_TYPE;
return GptUpdateKernelWithEntry(gpt, e, update_type);
}
/*
* Func: GptFindNthEntry
* Desc: This function returns 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)
{
GptHeader *header = (GptHeader *)gpt->primary_header;
GptEntry *entries = (GptEntry *)gpt->primary_entries;
GptEntry *e;
int i;
for (i = 0, e = entries; i < header->number_of_entries; i++, e++) {
if (!Memcmp(&e->type, guid, sizeof(*guid))) {
if (n == 0)
return e;
n--;
}
}
return NULL;
}