cgpt: Separate out certain GPT manipluation functions

For kernel NAND support, some vboot/cgptlib functionality is
needed from depthcharge. This patch moves certain function
declarations to a new header in firmware/include and puts
their definitions in a common place.

TEST=make runalltests passes and packages build
BRANCH=none
BUG=chromium:403432

Change-Id: Idd42b1f9f531651d78bb4afb80ca90c24aae93d9
Reviewed-on: https://chromium-review.googlesource.com/224996
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Commit-Queue: Daniel Ehrenberg <dehrenberg@chromium.org>
Tested-by: Daniel Ehrenberg <dehrenberg@chromium.org>

firmware/lib/cgptlib/include/cgptlib.h

@@ -7,110 +7,7 @@
 #define VBOOT_REFERENCE_CGPTLIB_H_
 
 #include "sysincludes.h"
-
-enum {
-	GPT_SUCCESS = 0,
-	GPT_ERROR_NO_VALID_KERNEL,
-	GPT_ERROR_INVALID_HEADERS,
-	GPT_ERROR_INVALID_ENTRIES,
-	GPT_ERROR_INVALID_SECTOR_SIZE,
-	GPT_ERROR_INVALID_SECTOR_NUMBER,
-	GPT_ERROR_INVALID_UPDATE_TYPE,
-	GPT_ERROR_CRC_CORRUPTED,
-	GPT_ERROR_OUT_OF_REGION,
-	GPT_ERROR_START_LBA_OVERLAP,
-	GPT_ERROR_END_LBA_OVERLAP,
-	GPT_ERROR_DUP_GUID,
-	GPT_ERROR_INVALID_FLASH_GEOMETRY,
-	GPT_ERROR_NO_SUCH_ENTRY,
-	/* Number of errors */
-	GPT_ERROR_COUNT
-};
-
-/* Bit masks for GptData.modified field. */
-#define GPT_MODIFIED_HEADER1 0x01
-#define GPT_MODIFIED_HEADER2 0x02
-#define GPT_MODIFIED_ENTRIES1 0x04
-#define GPT_MODIFIED_ENTRIES2 0x08
-
-/*
- * Size of GptData.primary_entries and secondary_entries: 128 bytes/entry * 128
- * entries.
- */
-#define TOTAL_ENTRIES_SIZE 16384
-
-/*
- * The 'update_type' of GptUpdateKernelEntry().  We expose TRY and BAD only
- * because those are what verified boot needs.  For more precise control on GPT
- * attribute bits, please refer to gpt_internal.h.
- */
-enum {
-	/*
-	 * System will be trying to boot the currently selected kernel
-	 * partition.  Update its try count if necessary.
-	 */
-	GPT_UPDATE_ENTRY_TRY = 1,
-	/*
-	 * The currently selected kernel partition failed validation.  Mark
-	 * entry as invalid.
-	 */
-	GPT_UPDATE_ENTRY_BAD = 2,
-};
-
-typedef struct {
-	/* Fill in the following fields before calling GptInit() */
-	/* GPT primary header, from sector 1 of disk (size: 512 bytes) */
-	uint8_t *primary_header;
-	/* GPT secondary header, from last sector of disk (size: 512 bytes) */
-	uint8_t *secondary_header;
-	/* Primary GPT table, follows primary header (size: 16 KB) */
-	uint8_t *primary_entries;
-	/* Secondary GPT table, precedes secondary header (size: 16 KB) */
-	uint8_t *secondary_entries;
-	/* Size of a LBA sector, in bytes */
-	uint32_t sector_bytes;
-	/* Size of drive in LBA sectors, in sectors */
-	uint64_t drive_sectors;
-
-	/* Outputs */
-	/* Which inputs have been modified?  GPT_MODIFIED_* */
-	uint8_t modified;
-	/*
-	 * The current chromeos kernel index in partition table.  -1 means not
-	 * found on drive. Note that GPT partition numbers are traditionally
-	 * 1-based, but we're using a zero-based index here.
-	 */
-	int current_kernel;
-
-	/* Internal variables */
-	uint32_t valid_headers, valid_entries;
-	int current_priority;
-} GptData;
-
-/**
- * Initializes the GPT data structure's internal state.
- *
- * The following fields must be filled before calling this function:
- *
- *   primary_header
- *   secondary_header
- *   primary_entries
- *   secondary_entries
- *   sector_bytes
- *   drive_sectors
- *
- * 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, non-zero if error:
- *   GPT_ERROR_INVALID_HEADERS, both partition table headers are invalid, enters
- *                              recovery mode,
- *   GPT_ERROR_INVALID_ENTRIES, both partition table entries are invalid, enters
- *                              recovery mode,
- *   GPT_ERROR_INVALID_SECTOR_SIZE, size of a sector is not supported,
- *   GPT_ERROR_INVALID_SECTOR_NUMBER, number of sectors in drive is invalid (too
- *                                    small) */
-int GptInit(GptData *gpt);
+#include "gpt_misc.h"
 
 /**
  * Provides the location of the next kernel partition, in order of decreasing