vsb.h

intel的一个高效率FLASH文件系统。思路很好

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/*----------------------------------------------------------------------------
-
-     vsb.h --
-
-----------------------------------------------------------------------------*/


#ifndef VSB_H
#define VSB_H

#include "vsbproto.h"
#include "flashdef.h"


/*****************************************************************************
*
*  VSB.H -- Manifest constants for the Virtual Small Block flash memory
*           driver.
*
*****************************************************************************/
#define FREE_VSB_BUFFER_SIZE	   4
#define LOGICAL_VSB_BUFFER_SIZE	   5

#define MRU_VSB_CACHE_SIZE		  15

#define MAXIMUM_LOGICAL_VSB_BITS  12 /* the number of bits available   */
                                     /* in the vat entry for logical   */
                                     /* vsb number. Used to test setup */
                                     /* during initialization.         */


/**************************

   Flash block state definitions

**************************/
#define VSB_FB_ERASED      0xff     /* Flash block is erased */
#define VSB_FB_RECOVER     0xfe     /* Flash block is being recovered into */
#define VSB_FB_ERASING     0xfc     /* Erasing child block */
#define VSB_FB_WRITE       0xf8     /* Flash block is being written to */
#define VSB_FB_FULL        0xf0     /* Flash block is fully allocated */
#define VSB_FB_BAD         0xa55a   /* Flash block is bad */
#define VSB_FB_CHILD_MASK  0x00ff   /* Mask for block being recovered from */
#define VSB_FB_PLR_ERASING 0xFD     /* Powerloss recovery for erase */
#define VSB_FB_PLR_WRITE   0xFB     /* Powerloss recovery for Write */
#define VSB_FB_PLR_WRITE_MASK 0x0B  /* Powerloss recover state for write */
#define VSB_FB_MLC_FULL    0xF4     /* PLR transition state */

#define VSB_FB_UNUSED      0xffff

#define VSB_FB_ATTR        0x0000   /* Offset to block attribute */

/**************************

   Virtual Small Block VAT entry definitions.
   The upper 4 bits of a VSB entry are used to indicate the state of a VSB,

   XXXX VVVVVVVVVVVV
   ^^^^\____________/
   ||||      |
   ||||      +---------------- VSB Number
   |||+----------------------- VSB is valid
   ||+------------------------ Allocated Flag, means VSB number is valid
   |+------------------------- VSB being allocated
   +-------------------------- VSB Discarded
   
**************************/
#define VSB_VAT_FLAGS         0xf000   /* VSB VAT flags mask */
#define VSB_FREE              0xffff   /* VSB unallocated value */
#define VSB_ALLOCATING        0xbfff   /* VSB being allocated value */
#define VSB_ALLOCATING_MASK   0xb000   /* VSB being allocated mask */
#define VSB_ALLOCATED         0x9fff   /* VSB is allocated value */
#define VSB_ALLOCATED_MASK    0x9000   /* VSB is allocated mask */
#define VSB_VALID             0x8fff   /* VSB is valid value */
#define VSB_DISCARDED         0x0fff   /* VSB discarded value */
#define VSB_DISCARD_MASK      0x8000   /* VSB discarded bit mask */
#define VSB_LOGICAL_MASK      0x0fff   /* get logical VSB mask */
#define VSB_PLR_DISCARDED     0x7FFF   /* Discard transition state (PLR) */
#define VSB_PLR_DISCARD_MASK  0x7000   /* Mask for Discarding check */
#define VSB_MLC_ALLOCATED_MASK 0xA000  /* PLR recovery state for Allocated */
   

#define VAT_ENTRY_SIZE        2        /* Number of bytes in a VAT entry */

#define	RECLAIM_THRESHOLD     5     /* FreeSpaceManagement: */
/*#define MAXIMUM_VSB  (WORD)(DWORD)((VSB_PER_BLOCK - 1) * (BLOCK_COUNT - 1))*/
/*E.2.41 VAT_SIZE_VAB, defined and MAXIMUM_VSB changed to include VAT_SIZE_VSB  */
#define MAX_ERASED_BLOCKS     2

#define VSB_SIZE              1024L    /*Virtual Small block size in bytes*/
                                        /* VSBs in 1 flash block */

#define VSB_PER_BLOCK      (WORD)(BLOCK_SIZE / VSB_SIZE)

/*E2.3.41*/
#define TEMP_VAT  (WORD)(((VSB_PER_BLOCK * VAT_ENTRY_SIZE) % VSB_SIZE) ? 1L : 0L) 
/*TEMP_VAT should not be used anywhere else*/
#define VAT_SIZE_VSB  (WORD)(((VSB_PER_BLOCK * VAT_ENTRY_SIZE) / VSB_SIZE) + TEMP_VAT)

#define MAXIMUM_VSB   (WORD)((VSB_PER_BLOCK - VAT_SIZE_VSB) * (BLOCK_COUNT - 1))

#include "vsbdata.h"

/* 2^12 maximum data allowed*/

/*
#if MAXIMUM_VSB > 4096 

#error MAXIMUM_VSB per component is more than total logical VSBs allowed.

#endif
*/
/*E2.3.41*/
/**************************

   VSB function error return values

**************************/

#endif