mmulib.c

VxWorks BSP框架源代码包含头文件和驱动

    if (mmuEnabled)					\
	{						\
	cacheDClearDisable ();				\
	mmuADisable ();	/* switch off MPU */		\
	}						\
    }

        #define MMU_LOCK(oldLevel)				\
    {							\
    if (mmuEnabled)					\
	{						\
	mmuAEnable (cacheArchState);			\
	}						\
    intIFUnlock (oldLevel);				\
    }

    #endif /* (!ARM_HAS_MPU) */

/* forward declarations */


LOCAL MMU_TRANS_TBL * mmuTransTblCreate (void);
LOCAL STATUS mmuTransTblDelete (MMU_TRANS_TBL *transTbl);
LOCAL STATUS mmuEnable (BOOL enable);
LOCAL STATUS mmuStateGet (MMU_TRANS_TBL *transTbl, void *pageAddr, UINT *state);
LOCAL STATUS mmuPageMap (MMU_TRANS_TBL *transTbl, void *virtAddr,
                         void *physPage);
    #if (ARM_HAS_MPU)
LOCAL STATUS mmuGlobalPageMap (void *virtAddr, void *physPage, UINT len);
    #else
LOCAL STATUS mmuGlobalPageMap (void *virtAddr, void *physPage);
    #endif
LOCAL STATUS mmuTranslate (MMU_TRANS_TBL *transTbl, void *virtAddr,
                           void **physAddress);
LOCAL void mmuCurrentSet (MMU_TRANS_TBL *transTbl);
    #if (!ARM_HAS_MPU)
LOCAL STATUS mmuStateSet (MMU_TRANS_TBL *transTbl, void *pageAddr,
                          UINT stateMask, UINT state);
LOCAL STATUS mmuPteGet (MMU_TRANS_TBL *pTransTbl, void *virtAddr, PTE **result);
LOCAL STATUS mmuVirtualPageCreate (MMU_TRANS_TBL *thisTbl, void *virtPageAddr);
LOCAL void * mmuDummy (void * address);
    #else /* (!ARM_HAS_MPU) */
LOCAL STATUS mmuStateSetRegion (MMU_TRANS_TBL *transTbl, void *pageAddr,
                                UINT stateMask, UINT state, UINT32 size);
    #endif /* (!ARM_HAS_MPU) */

/* For the new architectures, this is local to this file */

LOCAL STATUS mmuLibInit (int pageSize);

    #if (!ARM_HAS_MPU)

/*
 * The following is not called by the higher level routines, but is
 * used internally to make setting the state of multiple pages easier.
 */

LOCAL STATUS mmuStateSetMultiple (MMU_TRANS_TBL *transTbl, void *pageAddr,
                                  UINT stateMask, UINT state, int cnt);
    #endif /* (!ARM_HAS_MPU) */

/* Used internally as well */

LOCAL STATUS mmuTransTblInit (MMU_TRANS_TBL *newTransTbl);


/* globals */


    #if (!ARM_HAS_MPU)

/*
 * We're using generic libraries now so these are local to
 * this file, and should not be accessed by users.  They are set to the
 * function pointers passed in as parameters to mmuLibInstall().
 */

LOCAL void * (* _func_armVirtToPhys) (void *) = NULL;
LOCAL void * (* _func_armPhysToVirt) (void *) = NULL;


/* locals */

/* the memory partition id for the memory source for the page tables etc. */

LOCAL PART_ID mmuPageSource = NULL;

/*
 * The global memory translation table:
 * a translation table to hold the descriptors for the global transparent
 * translation of physical to virtual memory
 */

LOCAL MMU_TRANS_TBL mmuGlobalTransTbl;

/*
 * Array of booleans used to keep track of sections of virtual memory defined
 * as global. It could be declared as BOOL *, but save space by declaring it
 * as UINT8 *. It could even be done as a bit array.
 */

LOCAL UINT8 * globalPageBlock;

/*
 * A pointer to an array , "mini-heap", of 256 second level page tables
 * (1 KB) beginning on a mmuPageSize boundary.
 */
LOCAL UINT8 *mmuSecondLevelMiniHeap = NULL;

/*
 * The index into the current mini-heap.
 */
LOCAL UINT32 mmuSecondLevelMiniHeap_Index = 0;

/*
 * The max number of second level tables within
 * a mini-heap. This is set to a default value in
 * mmuLibInit. It can be set by the bsp prior to
 * mmuLibInit being called. The actual size of the mini-heap
 * is calculated back from this value.
 */
#define mmuSecondLevelMiniHeap_Max   FN(mmu,SecondLevelMiniHeap_Max)
UINT32 mmuSecondLevelMiniHeap_Max = 0;

/*
 * Actual size, in bytes,  of the allocated mini-heap.
 * calculated in mmuLibInit after mmuSecondLevelMiniHeap_Max
 * is established.
 */
LOCAL UINT32 mmuSecondLevelMiniHeap_Size = 0;

/*
 * Size in bytes of a second level page table.
 */
        #define L2_PTE_SIZE 1024

/*
 * Number of L2 Pte entries per page.
 */
        #define L2_PTE_PER_PAGE (mmuPageSize / L2_PTE_SIZE )

/*
 * Default size of the mini-heap.
 */
        #define PAGES_PER_MINI_HEAP 4

    #endif /* !ARM_HAS_MPU */


LOCAL int mmuPageSize;  /* size of MMU pages in bytes */

LOCAL BOOL mmuEnabled;


/*
 * The table used to define the mapping between the architecture-independent
 * values (VM_*) and the architecture-specific values (MMU_*)
 */

LOCAL STATE_TRANS_TUPLE mmuStateTransArrayLocal [] =
    {
    {VM_STATE_MASK_VALID, MMU_STATE_MASK_VALID,
        VM_STATE_VALID, MMU_STATE_VALID},

    {VM_STATE_MASK_VALID, MMU_STATE_MASK_VALID,
        VM_STATE_VALID_NOT, MMU_STATE_VALID_NOT},

#if (!ARM_HAS_MPU)
    /* current MPUs do not allow us to mark pages as read-only from SVC code */

    {VM_STATE_MASK_WRITABLE, MMU_STATE_MASK_WRITABLE,
        VM_STATE_WRITABLE, MMU_STATE_WRITABLE},

    {VM_STATE_MASK_WRITABLE, MMU_STATE_MASK_WRITABLE,
        VM_STATE_WRITABLE_NOT, MMU_STATE_WRITABLE_NOT},
#endif

    {VM_STATE_MASK_CACHEABLE, MMU_STATE_MASK_CACHEABLE,
        VM_STATE_CACHEABLE, MMU_STATE_CACHEABLE},

    {VM_STATE_MASK_CACHEABLE, MMU_STATE_MASK_CACHEABLE,
        VM_STATE_CACHEABLE_NOT, MMU_STATE_CACHEABLE_NOT},

#if (ARMMMU == ARMMMU_XSCALE)
    {VM_STATE_MASK_EX_CACHEABLE, MMU_STATE_MASK_EX_CACHEABLE,
        VM_STATE_EX_CACHEABLE, MMU_STATE_EX_CACHEABLE},

    {VM_STATE_MASK_EX_CACHEABLE, MMU_STATE_MASK_EX_CACHEABLE,
        VM_STATE_EX_CACHEABLE_NOT, MMU_STATE_EX_CACHEABLE_NOT},
#endif

    {VM_STATE_MASK_BUFFERABLE, MMU_STATE_MASK_CACHEABLE,
        VM_STATE_BUFFERABLE, MMU_STATE_BUFFERABLE},

    {VM_STATE_MASK_BUFFERABLE, MMU_STATE_MASK_CACHEABLE,
        VM_STATE_BUFFERABLE_NOT, MMU_STATE_BUFFERABLE_NOT},

#if (ARMMMU == ARMMMU_XSCALE)
    {VM_STATE_MASK_EX_BUFFERABLE, MMU_STATE_MASK_EX_CACHEABLE,
        VM_STATE_EX_BUFFERABLE, MMU_STATE_EX_BUFFERABLE},

    {VM_STATE_MASK_EX_BUFFERABLE, MMU_STATE_MASK_EX_CACHEABLE,
        VM_STATE_EX_BUFFERABLE_NOT, MMU_STATE_EX_BUFFERABLE_NOT},
#endif

#if ARMCACHE_HAS_WRITETHROUGH
    {VM_STATE_MASK_CACHEABLE, MMU_STATE_MASK_CACHEABLE,
        VM_STATE_CACHEABLE_WRITETHROUGH, MMU_STATE_CACHEABLE_WRITETHROUGH},
#endif

#if ((ARMMMU == ARMMMU_SA1100) || (ARMMMU == ARMMMU_SA1500))
    {VM_STATE_MASK_CACHEABLE, MMU_STATE_MASK_CACHEABLE,
        VM_STATE_CACHEABLE_MINICACHE, MMU_STATE_CACHEABLE_MINICACHE},
#endif

#if (ARMMMU == ARMMMU_XSCALE)
    {VM_STATE_MASK_EX_CACHEABLE, MMU_STATE_MASK_EX_CACHEABLE,
        VM_STATE_CACHEABLE_MINICACHE, MMU_STATE_CACHEABLE_MINICACHE},
#endif
    };

LOCAL MMU_LIB_FUNCS mmuLibFuncsLocal =
    {
    mmuLibInit,
    mmuTransTblCreate,
    mmuTransTblDelete,
    mmuEnable,
#if (ARM_HAS_MPU)
    mmuStateSetRegion,
#else
    mmuStateSet,
#endif
    mmuStateGet,
    mmuPageMap,
    mmuGlobalPageMap,
    mmuTranslate,
    mmuCurrentSet
    };
#endif /* (ARMMMU != ARMMMU_NONE) */

IMPORT STATE_TRANS_TUPLE *mmuStateTransArray;
IMPORT int mmuStateTransArraySize;
IMPORT MMU_LIB_FUNCS mmuLibFuncs;
IMPORT int mmuPageBlockSize;

IMPORT int ffsMsb (UINT32 val);
IMPORT int ffsLsb (UINT32 val);

#if (!ARM_HAS_MPU)
IMPORT PART_ID (* _func_armPageSource) (void);
#endif /* !ARM_HAS_MPU */

/*
 * Variable used to keep desired cache enable state: layout as MMUCR
 * (variously I, Z, W and C bits for different cache/MMUs).  This is
 * used by mmuALib when enabling the MMU, to enable the appropriate cache
 * features that cannot be enabled when the MMU is disabled.  See
 * cacheArchEnable().  For example, we must disable the D-cache,
 * write-buffer and branch-prediction when disabling the MMU on most
 * cache/MMUs and need to know what to turn back on when the MMU is
 * re-enabled.
*/

IMPORT UINT32 cacheArchState;

/*
 * The function pointer is declared in a different module, and does not
 * have a unique-ified name. This is the function pointer that is set to
 * point to the initialization routine of the appropriate variant of this
 * file.
 */

IMPORT FUNCPTR sysMmuLibInit;

/*******************************************************************************
*
* mmuLibInstall - install specific ARM MMU library function pointers
*
* This routine is provided as a hook so that calling this routine
* selects the specific MMU library. It also allows any virtual <->
* physical address translation routines provide by the BSP to be passed
* to the MMU library as parameters rather than as global data.
*
* INTERNAL
* This routine is called (from sysHwInit0()), before sysHwInit has been
* called, and before BSS has been cleared.
*
* RETURNS: N/A
*
*/

void mmuLibInstall
    (
    void * (physToVirt) (void *),
    void * (virtToPhys) (void *)
    )
    {
    static BOOL initialized = FALSE;

    /* protect against being called twice */

    if (initialized)
        return;

    /*
     * Set the function pointers appropriate for the type of MMU. On 710a,
     * we must use the versions of these routines that use a soft-copy
     * of the MMU Control Register.
     */

#if (ARMMMU == ARMMMU_710A)
    mmuCrGet = mmuSoftCrGet;
    mmuModifyCr = mmuModifySoftCr;
#else
    mmuCrGet = mmuHardCrGet;
    mmuModifyCr = mmuModifyHardCr;
#endif

#if (!ARM_HAS_MPU)
    _func_armPhysToVirt = physToVirt;
    _func_armVirtToPhys = virtToPhys;
#endif /* (!ARM_HAS_MPU) */

    sysMmuLibInit = mmuLibInit;

    initialized = TRUE;

    return;

    }

/******************************************************************************
*
* mmuLibInit - initialize MMU handling module (ARM)
*
* Build a dummy translation table that will hold the page table entries
* for the global translation table.  The MMU remains disabled upon
* completion.  Note that this routine is global so that it may be referred to
* in usrConfig.c to pull in the correct mmuLib for the specific architecture.
*
* RETURNS: OK, or ERROR.
*
* ERRNO:
*  S_mmuLib_INVALID_PAGE_SIZE
*/

LOCAL STATUS mmuLibInit
    (
    int pageSize    /* system pageSize (must be 4096) */
    )
    {
#if (ARMMMU != ARMMMU_NONE)
    static BOOL initialized = FALSE;
#if (!ARM_HAS_MPU)
    LEVEL_1_DESC *  pL1;
#endif

    /* protect against being called twice */

    if (initialized)
        return OK;

#if (!ARM_HAS_MPU)

    /*
     * If the BSP has not specified a routine to set a memory partition to
     * obtain pages from, then initialize mmuPageSource to the system memory
     * partition.
     */

    if (_func_armPageSource == NULL)
        mmuPageSource = memSysPartId;
    else
        mmuPageSource = _func_armPageSource ();


    /*
     * If the BSP has not specified routines for address translation, then
     * assume that virtual and physical addresses for page table entries
     * will be identical. Install dummy translation routine.
     */

    if (_func_armPhysToVirt == NULL)
        _func_armPhysToVirt = mmuDummy;

    if (_func_armVirtToPhys == NULL)
        _func_armVirtToPhys = mmuDummy;
#endif /* !ARM_HAS_MPU */


    /* initialize the data objects that are shared with vmLib.c */

    mmuStateTransArray = &mmuStateTransArrayLocal [0];