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cgpt: Support non-standard (smaller) entries table

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The standard says that entries table must be at least 16384 bytes. On
some of our devices, the NOR section is only 8 KiB and used to store
both primary and secondary tables. On this device, we can only store 24
entries.

Therefore, this CL adds support for non-standard entry table. It adjusts
the MIN_NUMBER_OF_ENTRIES to 16, and replaces GPT_ENTRIES_SECTORS with
CalculateEntriesSectors.

BUG=chromium:441812
BRANCH=none
TEST=unittest

Change-Id: I6b85b35ce5612c7abb22142f8252bd0d45b676c5
Reviewed-on: https://chromium-review.googlesource.com/234996
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Commit-Queue: Nam Nguyen <namnguyen@chromium.org>
Tested-by: Nam Nguyen <namnguyen@chromium.org>
This commit is contained in:
Nam T. Nguyen
2014-12-12 09:38:35 -08:00
committed by chrome-internal-fetch
parent 32a999d2c0
commit 3200401242
8 changed files with 89 additions and 48 deletions
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12
firmware/lib/cgptlib/include/cgptlib_internal.h
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@@ -51,17 +51,12 @@
#define MIN_SIZE_OF_ENTRY 128
#define MAX_SIZE_OF_ENTRY 512
#define SIZE_OF_ENTRY_MULTIPLE 8
#define MIN_NUMBER_OF_ENTRIES 32
#define MIN_NUMBER_OF_ENTRIES 16
#define MAX_NUMBER_OF_ENTRIES 512
/* Defines GPT sizes */
#define GPT_PMBR_SECTORS 1 /* size (in sectors) of PMBR */
#define GPT_HEADER_SECTORS 1
/*
* Entries sectors assumes sector size if 512 bytes; then (TOTAL_ENTRIES_SIZE /
* 512) = 32
*/
#define GPT_ENTRIES_SECTORS 32
/*
* Alias name of index in internal array for primary and secondary header and
@@ -163,4 +158,9 @@ void GetCurrentKernelUniqueGuid(GptData *gpt, void *dest);
*/
const char *GptErrorText(int error_code);
/**
* Return number of 512-byte sectors required to store the entries table.
*/
size_t CalculateEntriesSectors(GptHeader* h);
#endif /* VBOOT_REFERENCE_CGPTLIB_INTERNAL_H_ */