litmus-rt.git - The LITMUS^RT kernel.

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The LITMUS^RT kernel.

Bjoern Brandenburg

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/****************************************************************************
*
*    Copyright (C) 2005 - 2013 by Vivante Corp.
*
*    This program is free software; you can redistribute it and/or modify
*    it under the terms of the GNU General Public License as published by
*    the Free Software Foundation; either version 2 of the license, or
*    (at your option) any later version.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
*    GNU General Public License for more details.
*
*    You should have received a copy of the GNU General Public License
*    along with this program; if not write to the Free Software
*    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*****************************************************************************/


#include "gc_hal_kernel_precomp.h"

#define _GC_OBJ_ZONE    gcvZONE_MMU

typedef enum _gceMMU_TYPE
{
    gcvMMU_USED     = (0 << 4),
    gcvMMU_SINGLE   = (1 << 4),
    gcvMMU_FREE     = (2 << 4),
}
gceMMU_TYPE;

#define gcmENTRY_TYPE(x) (x & 0xF0)

#define gcdMMU_TABLE_DUMP       0

#define gcdUSE_MMU_EXCEPTION    0

/*
    gcdMMU_CLEAR_VALUE

        The clear value for the entry of the old MMU.
*/
#ifndef gcdMMU_CLEAR_VALUE
#   define gcdMMU_CLEAR_VALUE                   0x00000ABC
#endif

typedef struct _gcsMMU_STLB *gcsMMU_STLB_PTR;

typedef struct _gcsMMU_STLB
{
    gctPHYS_ADDR    physical;
    gctUINT32_PTR   logical;
    gctSIZE_T       size;
    gctUINT32       physBase;
    gctSIZE_T       pageCount;
    gctUINT32       mtlbIndex;
    gctUINT32       mtlbEntryNum;
    gcsMMU_STLB_PTR next;
} gcsMMU_STLB;

#if gcdSHARED_PAGETABLE
typedef struct _gcsSharedPageTable * gcsSharedPageTable_PTR;
typedef struct _gcsSharedPageTable
{
    /* Shared gckMMU object. */
    gckMMU          mmu;

    /* Hardwares which use this shared pagetable. */
    gckHARDWARE     hardwares[gcdMAX_GPU_COUNT];

    /* Number of cores use this shared pagetable. */
    gctUINT32       reference;
}
gcsSharedPageTable;

static gcsSharedPageTable_PTR sharedPageTable = gcvNULL;
#endif

#if gcdMIRROR_PAGETABLE
typedef struct _gcsMirrorPageTable * gcsMirrorPageTable_PTR;
typedef struct _gcsMirrorPageTable
{
    /* gckMMU objects. */
    gckMMU          mmus[gcdMAX_GPU_COUNT];

    /* Hardwares which use this shared pagetable. */
    gckHARDWARE     hardwares[gcdMAX_GPU_COUNT];

    /* Number of cores use this shared pagetable. */
    gctUINT32       reference;
}
gcsMirrorPageTable;

static gcsMirrorPageTable_PTR mirrorPageTable = gcvNULL;
static gctPOINTER mirrorPageTableMutex = gcvNULL;
#endif

typedef struct _gcsDynamicSpaceNode * gcsDynamicSpaceNode_PTR;
typedef struct _gcsDynamicSpaceNode
{
    gctUINT32       start;
    gctINT32        entries;
}
gcsDynamicSpaceNode;

static void
_WritePageEntry(
    IN gctUINT32_PTR PageEntry,
    IN gctUINT32     EntryValue
    )
{
    static gctUINT16 data = 0xff00;

    if (*(gctUINT8 *)&data == 0xff)
    {
        *PageEntry = gcmSWAB32(EntryValue);
    }
    else
    {
        *PageEntry = EntryValue;
    }
}

static gctUINT32
_ReadPageEntry(
    IN gctUINT32_PTR PageEntry
    )
{
    static gctUINT16 data = 0xff00;
    gctUINT32 entryValue;

    if (*(gctUINT8 *)&data == 0xff)
    {
        entryValue = *PageEntry;
        return gcmSWAB32(entryValue);
    }
    else
    {
        return *PageEntry;
    }
}

static gceSTATUS
_FillPageTable(
    IN gctUINT32_PTR PageTable,
    IN gctUINT32     PageCount,
    IN gctUINT32     EntryValue
)
{
    gctUINT i;

    for (i = 0; i < PageCount; i++)
    {
        _WritePageEntry(PageTable + i, EntryValue);
    }

    return gcvSTATUS_OK;
}

static gceSTATUS
_Link(
    IN gckMMU Mmu,
    IN gctUINT32 Index,
    IN gctUINT32 Next
    )
{
    if (Index >= Mmu->pageTableEntries)
    {
        /* Just move heap pointer. */
        Mmu->heapList = Next;
    }
    else
    {
        /* Address page table. */
        gctUINT32_PTR pageTable = Mmu->pageTableLogical;

        /* Dispatch on node type. */
        switch (gcmENTRY_TYPE(_ReadPageEntry(&pageTable[Index])))
        {
        case gcvMMU_SINGLE:
            /* Set single index. */
            _WritePageEntry(&pageTable[Index], (Next << 8) | gcvMMU_SINGLE);
            break;

        case gcvMMU_FREE:
            /* Set index. */
            _WritePageEntry(&pageTable[Index + 1], Next);
            break;

        default:
            gcmkFATAL("MMU table correcupted at index %u!", Index);
            return gcvSTATUS_HEAP_CORRUPTED;
        }
    }

    /* Success. */
    return gcvSTATUS_OK;
}

static gceSTATUS
_AddFree(
    IN gckMMU Mmu,
    IN gctUINT32 Index,
    IN gctUINT32 Node,
    IN gctUINT32 Count
    )
{
    gctUINT32_PTR pageTable = Mmu->pageTableLogical;

    if (Count == 1)
    {
        /* Initialize a single page node. */
        _WritePageEntry(pageTable + Node, (~((1U<<8)-1)) | gcvMMU_SINGLE);
    }
    else
    {
        /* Initialize the node. */
        _WritePageEntry(pageTable + Node + 0, (Count << 8) | gcvMMU_FREE);
        _WritePageEntry(pageTable + Node + 1, ~0U);
    }

    /* Append the node. */
    return _Link(Mmu, Index, Node);
}

static gceSTATUS
_Collect(
    IN gckMMU Mmu
    )
{
    gctUINT32_PTR pageTable = Mmu->pageTableLogical;
    gceSTATUS status;
    gctUINT32 i, previous, start = 0, count = 0;

    previous = Mmu->heapList = ~0U;
    Mmu->freeNodes = gcvFALSE;

    /* Walk the entire page table. */
    for (i = 0; i < Mmu->pageTableEntries; ++i)
    {
        /* Dispatch based on type of page. */
        switch (gcmENTRY_TYPE(_ReadPageEntry(&pageTable[i])))
        {
        case gcvMMU_USED:
            /* Used page, so close any open node. */
            if (count > 0)
            {
                /* Add the node. */
                gcmkONERROR(_AddFree(Mmu, previous, start, count));

                /* Reset the node. */
                previous = start;
                count    = 0;
            }
            break;

        case gcvMMU_SINGLE:
            /* Single free node. */
            if (count++ == 0)
            {
                /* Start a new node. */
                start = i;
            }
            break;

        case gcvMMU_FREE:
            /* A free node. */
            if (count == 0)
            {
                /* Start a new node. */
                start = i;
            }

            /* Advance the count. */
            count += _ReadPageEntry(&pageTable[i]) >> 8;

            /* Advance the index into the page table. */
            i     += (_ReadPageEntry(&pageTable[i]) >> 8) - 1;
            break;

        default:
            gcmkFATAL("MMU page table correcupted at index %u!", i);
            return gcvSTATUS_HEAP_CORRUPTED;
        }
    }

    /* See if we have an open node left. */
    if (count > 0)
    {
        /* Add the node to the list. */
        gcmkONERROR(_AddFree(Mmu, previous, start, count));
    }

    gcmkTRACE_ZONE(gcvLEVEL_INFO, gcvZONE_MMU,
                   "Performed a garbage collection of the MMU heap.");

    /* Success. */
    return gcvSTATUS_OK;

OnError:
    /* Return the staus. */
    return status;
}

static gctUINT32
_SetPage(gctUINT32 PageAddress)
{
    return PageAddress
           /* writable */
           | (1 << 2)
           /* Ignore exception */
           | (0 << 1)
           /* Present */
           | (1 << 0);
}

static gceSTATUS
_FillFlatMapping(
    IN gckMMU Mmu,
    IN gctUINT32 PhysBase,
    OUT gctSIZE_T Size
    )
{
    gceSTATUS status;
    gctBOOL mutex = gcvFALSE;
    gcsMMU_STLB_PTR head = gcvNULL, pre = gcvNULL;
    gctUINT32 start = PhysBase & (~gcdMMU_PAGE_64K_MASK);
    gctUINT32 end = (PhysBase + Size - 1) & (~gcdMMU_PAGE_64K_MASK);
    gctUINT32 mStart = start >> gcdMMU_MTLB_SHIFT;
    gctUINT32 mEnd = end >> gcdMMU_MTLB_SHIFT;
    gctUINT32 sStart = (start & gcdMMU_STLB_64K_MASK) >> gcdMMU_STLB_64K_SHIFT;
    gctUINT32 sEnd = (end & gcdMMU_STLB_64K_MASK) >> gcdMMU_STLB_64K_SHIFT;

    /* Grab the mutex. */
    gcmkONERROR(gckOS_AcquireMutex(Mmu->os, Mmu->pageTableMutex, gcvINFINITE));
    mutex = gcvTRUE;

    while (mStart <= mEnd)
    {
        gcmkASSERT(mStart < gcdMMU_MTLB_ENTRY_NUM);
        if (*(Mmu->mtlbLogical + mStart) == 0)
        {
            gcsMMU_STLB_PTR stlb;
            gctPOINTER pointer = gcvNULL;
            gctUINT32 last = (mStart == mEnd) ? sEnd : (gcdMMU_STLB_64K_ENTRY_NUM - 1);

            gcmkONERROR(gckOS_Allocate(Mmu->os, sizeof(struct _gcsMMU_STLB), &pointer));
            stlb = pointer;

            stlb->mtlbEntryNum = 0;
            stlb->next = gcvNULL;
            stlb->physical = gcvNULL;
            stlb->logical = gcvNULL;
            stlb->size = gcdMMU_STLB_64K_SIZE;
            stlb->pageCount = 0;

            if (pre == gcvNULL)
            {
                pre = head = stlb;
            }
            else
            {
                gcmkASSERT(pre->next == gcvNULL);
                pre->next = stlb;
                pre = stlb;
            }

            gcmkONERROR(
                    gckOS_AllocateContiguous(Mmu->os,
                                             gcvFALSE,
                                             &stlb->size,
                                             &stlb->physical,
                                             (gctPOINTER)&stlb->logical));

            gcmkONERROR(gckOS_ZeroMemory(stlb->logical, stlb->size));

            gcmkONERROR(gckOS_GetPhysicalAddress(
                Mmu->os,
                stlb->logical,
                &stlb->physBase));

            if (stlb->physBase & (gcdMMU_STLB_64K_SIZE - 1))
            {
                gcmkONERROR(gcvSTATUS_NOT_ALIGNED);
            }

            _WritePageEntry(Mmu->mtlbLogical + mStart,
                            stlb->physBase
                            /* 64KB page size */
                            | (1 << 2)
                            /* Ignore exception */
                            | (0 << 1)
                            /* Present */
                            | (1 << 0)
                            );
#if gcdMMU_TABLE_DUMP
            gckOS_Print("%s(%d): insert MTLB[%d]: %08x\n",
                __FUNCTION__, __LINE__,
                mStart,
                _ReadPageEntry(Mmu->mtlbLogical + mStart));
#endif

            stlb->mtlbIndex = mStart;
            stlb->mtlbEntryNum = 1;
#if gcdMMU_TABLE_DUMP
            gckOS_Print("%s(%d): STLB: logical:%08x -> physical:%08x\n",
                    __FUNCTION__, __LINE__,
                    stlb->logical,
                    stlb->physBase);
#endif

            while (sStart <= last)
            {
                gcmkASSERT(!(start & gcdMMU_PAGE_64K_MASK));
                _WritePageEntry(stlb->logical + sStart, _SetPage(start));
#if gcdMMU_TABLE_DUMP
                gckOS_Print("%s(%d): insert STLB[%d]: %08x\n",
                    __FUNCTION__, __LINE__,
                    sStart,
                    _ReadPageEntry(stlb->logical + sStart));
#endif
                /* next page. */
                start += gcdMMU_PAGE_64K_SIZE;
                sStart++;
                stlb->pageCount++;
            }

            sStart = 0;
            ++mStart;
        }
        else
        {
            gcmkONERROR(gcvSTATUS_INVALID_REQUEST);
        }
    }

    /* Insert the stlb into staticSTLB. */
    if (Mmu->staticSTLB == gcvNULL)
    {
        Mmu->staticSTLB = head;
    }
    else
    {
        gcmkASSERT(pre == gcvNULL);
        gcmkASSERT(pre->next == gcvNULL);
        pre->next = Mmu->staticSTLB;
        Mmu->staticSTLB = head;
    }

    /* Release the mutex. */
    gcmkVERIFY_OK(gckOS_ReleaseMutex(Mmu->os, Mmu->pageTableMutex));

    return gcvSTATUS_OK;

OnError:

    /* Roll back. */
    while (head != gcvNULL)
    {
        pre = head;
        head = head->next;

        if (pre->physical != gcvNULL)
        {
            gcmkVERIFY_OK(
                gckOS_FreeContiguous(Mmu->os,
                    pre->physical,
                    pre->logical,
                    pre->size));
        }

        if (pre->mtlbEntryNum != 0)
        {
            gcmkASSERT(pre->mtlbEntryNum == 1);
            _WritePageEntry(Mmu->mtlbLogical + pre->mtlbIndex, 0);
        }

        gcmkVERIFY_OK(gcmkOS_SAFE_FREE(Mmu->os, pre));
    }

    if (mutex)
    {
        /* Release the mutex. */
        gcmkVERIFY_OK(gckOS_ReleaseMutex(Mmu->os, Mmu->pageTableMutex));
    }

    return status;
}

static gceSTATUS
_FindDynamicSpace(
    IN gckMMU Mmu,
    OUT gcsDynamicSpaceNode_PTR *Array,
    OUT gctINT * Size
    )
{
    gceSTATUS status = gcvSTATUS_OK;
    gctPOINTER pointer = gcvNULL;
    gcsDynamicSpaceNode_PTR array = gcvNULL;
    gctINT size = 0;
    gctINT i = 0, nodeStart = -1, nodeEntries = 0;

    /* Allocate memory for the array. */
    gcmkONERROR(gckOS_Allocate(Mmu->os,
                               gcmSIZEOF(*array) * (gcdMMU_MTLB_ENTRY_NUM / 2),
                               &pointer));

    array = (gcsDynamicSpaceNode_PTR)pointer;

    /* Loop all the entries. */
    while (i < gcdMMU_MTLB_ENTRY_NUM)
    {
        if (!Mmu->mtlbLogical[i])
        {
            if (nodeStart < 0)
            {
                /* This is the first entry of the dynamic space. */
                nodeStart   = i;
                nodeEntries = 1;
            }
            else
            {
                /* Other entries of the dynamic space. */
                nodeEntries++;
            }
        }
        else if (nodeStart >= 0)
        {
            /* Save the previous node. */
            array[size].start   = nodeStart;
            array[size].entries = nodeEntries;
            size++;

            /* Reset the start. */
            nodeStart   = -1;
            nodeEntries = 0;
        }

        i++;
    }

    /* Save the previous node. */
    if (nodeStart >= 0)
    {
        array[size].start   = nodeStart;
        array[size].entries = nodeEntries;
        size++;
    }

#if gcdMMU_TABLE_DUMP
    for (i = 0; i < size; i++)
    {
        gckOS_Print("%s(%d): [%d]: start=%d, entries=%d.\n",
                __FUNCTION__, __LINE__,
                i,
                array[i].start,
                array[i].entries);
    }
#endif

    *Array = array;
    *Size  = size;

    return gcvSTATUS_OK;

OnError:
    if (pointer != gcvNULL)
    {
        gckOS_Free(Mmu->os, pointer);
    }

    return status;
}

static gceSTATUS
_SetupDynamicSpace(
    IN gckMMU Mmu
    )
{
    gceSTATUS status;
    gcsDynamicSpaceNode_PTR nodeArray = gcvNULL;
    gctINT i, nodeArraySize = 0;
    gctUINT32 physical;
    gctINT numEntries = 0;
    gctUINT32_PTR pageTable;
    gctBOOL acquired = gcvFALSE;

    /* Find all the dynamic address space. */
    gcmkONERROR(_FindDynamicSpace(Mmu, &nodeArray, &nodeArraySize));

    /* TODO: We only use the largest one for now. */
    for (i = 0; i < nodeArraySize; i++)
    {
        if (nodeArray[i].entries > numEntries)
        {
            Mmu->dynamicMappingStart = nodeArray[i].start;
            numEntries               = nodeArray[i].entries;
        }
    }

    gckOS_Free(Mmu->os, (gctPOINTER)nodeArray);

    Mmu->pageTableSize = numEntries * 4096;

    Mmu->pageTableEntries = Mmu->pageTableSize / gcmSIZEOF(gctUINT32);

    /* Construct Slave TLB. */
    gcmkONERROR(gckOS_AllocateContiguous(Mmu->os,
                gcvFALSE,
                &Mmu->pageTableSize,
                &Mmu->pageTablePhysical,
                (gctPOINTER)&Mmu->pageTableLogical));

#if gcdUSE_MMU_EXCEPTION
    gcmkONERROR(_FillPageTable(Mmu->pageTableLogical,
                               Mmu->pageTableEntries,
                               /* Enable exception */
                               1 << 1));
#else
    /* Invalidate all entries. */
    gcmkONERROR(gckOS_ZeroMemory(Mmu->pageTableLogical,
                Mmu->pageTableSize));
#endif

    /* Initilization. */
    pageTable      = Mmu->pageTableLogical;
    _WritePageEntry(pageTable,     (Mmu->pageTableEntries << 8) | gcvMMU_FREE);
    _WritePageEntry(pageTable + 1, ~0U);
    Mmu->heapList  = 0;
    Mmu->freeNodes = gcvFALSE;

    gcmkONERROR(gckOS_GetPhysicalAddress(Mmu->os,
                Mmu->pageTableLogical,
                &physical));

    /* Grab the mutex. */
    gcmkONERROR(gckOS_AcquireMutex(Mmu->os, Mmu->pageTableMutex, gcvINFINITE));
    acquired = gcvTRUE;

    /* Map to Master TLB. */
    for (i = (gctINT)Mmu->dynamicMappingStart;
         i < (gctINT)Mmu->dynamicMappingStart + numEntries;
         i++)
    {
        _WritePageEntry(Mmu->mtlbLogical + i,
                        physical
                        /* 4KB page size */
                        | (0 << 2)
                        /* Ignore exception */
                        | (0 << 1)
                        /* Present */
                        | (1 << 0)
                        );
#if gcdMMU_TABLE_DUMP
        gckOS_Print("%s(%d): insert MTLB[%d]: %08x\n",
                __FUNCTION__, __LINE__,
                i,
                _ReadPageEntry(Mmu->mtlbLogical + i));
#endif
        physical += gcdMMU_STLB_4K_SIZE;
    }

    /* Release the mutex. */
    gcmkVERIFY_OK(gckOS_ReleaseMutex(Mmu->os, Mmu->pageTableMutex));

    return gcvSTATUS_OK;

OnError:
    if (Mmu->pageTableLogical)
    {
        /* Free the page table. */
        gcmkVERIFY_OK(
                gckOS_FreeContiguous(Mmu->os,
                    Mmu->pageTablePhysical,
                    (gctPOINTER) Mmu->pageTableLogical,
                    Mmu->pageTableSize));
    }

    if (acquired)
    {
        /* Release the mutex. */
        gcmkVERIFY_OK(gckOS_ReleaseMutex(Mmu->os, Mmu->pageTableMutex));
    }

    return status;
}

/*******************************************************************************
**
**  _Construct
**
**  Construct a new gckMMU object.
**
**  INPUT:
**
**      gckKERNEL Kernel
**          Pointer to an gckKERNEL object.
**
**      gctSIZE_T MmuSize
**          Number of bytes for the page table.
**
**  OUTPUT:
**
**      gckMMU * Mmu
**          Pointer to a variable that receives the gckMMU object pointer.
*/
gceSTATUS
_Construct(
    IN gckKERNEL Kernel,
    IN gctSIZE_T MmuSize,
    OUT gckMMU * Mmu
    )
{
    gckOS os;
    gckHARDWARE hardware;
    gceSTATUS status;
    gckMMU mmu = gcvNULL;
    gctUINT32_PTR pageTable;
    gctPOINTER pointer = gcvNULL;

    gcmkHEADER_ARG("Kernel=0x%x MmuSize=%lu", Kernel, MmuSize);

    /* Verify the arguments. */
    gcmkVERIFY_OBJECT(Kernel, gcvOBJ_KERNEL);
    gcmkVERIFY_ARGUMENT(MmuSize > 0);
    gcmkVERIFY_ARGUMENT(Mmu != gcvNULL);

    /* Extract the gckOS object pointer. */
    os = Kernel->os;
    gcmkVERIFY_OBJECT(os, gcvOBJ_OS);

    /* Extract the gckHARDWARE object pointer. */
    hardware = Kernel->hardware;
    gcmkVERIFY_OBJECT(hardware, gcvOBJ_HARDWARE);

    /* Allocate memory for the gckMMU object. */
    gcmkONERROR(gckOS_Allocate(os, sizeof(struct _gckMMU), &pointer));

    mmu = pointer;

    /* Initialize the gckMMU object. */
    mmu->object.type      = gcvOBJ_MMU;
    mmu->os               = os;
    mmu->hardware         = hardware;
    mmu->pageTableMutex   = gcvNULL;
    mmu->pageTableLogical = gcvNULL;
    mmu->mtlbLogical      = gcvNULL;
    mmu->staticSTLB       = gcvNULL;
    mmu->enabled          = gcvFALSE;
#ifdef __QNXNTO__
    mmu->nodeList         = gcvNULL;
    mmu->nodeMutex        = gcvNULL;
#endif

    /* Create the page table mutex. */
    gcmkONERROR(gckOS_CreateMutex(os, &mmu->pageTableMutex));

#ifdef __QNXNTO__
    /* Create the node list mutex. */
    gcmkONERROR(gckOS_CreateMutex(os, &mmu->nodeMutex));
#endif

    if (hardware->mmuVersion == 0)
    {
        mmu->pageTableSize = MmuSize;

        gcmkONERROR(
            gckOS_AllocateContiguous(os,
                                     gcvFALSE,
                                     &mmu->pageTableSize,
                                     &mmu->pageTablePhysical,
                                     &pointer));

        mmu->pageTableLogical = pointer;

        /* Compute number of entries in page table. */
        mmu->pageTableEntries = mmu->pageTableSize / sizeof(gctUINT32);

        /* Mark all pages as free. */
        pageTable      = mmu->pageTableLogical;

#if gcdMMU_CLEAR_VALUE
        _FillPageTable(pageTable, mmu->pageTableEntries, gcdMMU_CLEAR_VALUE);
#endif

        _WritePageEntry(pageTable,     (mmu->pageTableEntries << 8) | gcvMMU_FREE);
        _WritePageEntry(pageTable + 1, ~0U);
        mmu->heapList  = 0;
        mmu->freeNodes = gcvFALSE;

        /* Set page table address. */
        gcmkONERROR(
            gckHARDWARE_SetMMU(hardware, (gctPOINTER) mmu->pageTableLogical));
    }
    else
    {
        /* Allocate the 4K mode MTLB table. */
        mmu->mtlbSize = gcdMMU_MTLB_SIZE + 64;

        gcmkONERROR(
            gckOS_AllocateContiguous(os,
                                     gcvFALSE,
                                     &mmu->mtlbSize,
                                     &mmu->mtlbPhysical,
                                     &pointer));

        mmu->mtlbLogical = pointer;

        /* Invalid all the entries. */
        gcmkONERROR(
            gckOS_ZeroMemory(pointer, mmu->mtlbSize));
    }

    /* Return the gckMMU object pointer. */
    *Mmu = mmu;

    /* Success. */
    gcmkFOOTER_ARG("*Mmu=0x%x", *Mmu);
    return gcvSTATUS_OK;

OnError:
    /* Roll back. */
    if (mmu != gcvNULL)
    {
        if (mmu->pageTableLogical != gcvNULL)
        {
            /* Free the page table. */
            gcmkVERIFY_OK(
                gckOS_FreeContiguous(os,
                                     mmu->pageTablePhysical,
                                     (gctPOINTER) mmu->pageTableLogical,
                                     mmu->pageTableSize));

        }

        if (mmu->mtlbLogical != gcvNULL)
        {
            gcmkVERIFY_OK(
                gckOS_FreeContiguous(os,
                                     mmu->mtlbPhysical,
                                     (gctPOINTER) mmu->mtlbLogical,
                                     mmu->mtlbSize));
        }

        if (mmu->pageTableMutex != gcvNULL)
        {
            /* Delete the mutex. */
            gcmkVERIFY_OK(
                gckOS_DeleteMutex(os, mmu->pageTableMutex));
        }

#ifdef __QNXNTO__
        if (mmu->nodeMutex != gcvNULL)
        {
            /* Delete the mutex. */
            gcmkVERIFY_OK(
                gckOS_DeleteMutex(os, mmu->nodeMutex));
        }
#endif

        /* Mark the gckMMU object as unknown. */
        mmu->object.type = gcvOBJ_UNKNOWN;

        /* Free the allocates memory. */
        gcmkVERIFY_OK(gcmkOS_SAFE_FREE(os, mmu));
    }

    /* Return the status. */
    gcmkFOOTER();
    return status;
}

/*******************************************************************************
**
**  _Destroy
**
**  Destroy a gckMMU object.
**
**  INPUT:
**
**      gckMMU Mmu
**          Pointer to an gckMMU object.
**
**  OUTPUT:
**
**      Nothing.
*/
gceSTATUS
_Destroy(
    IN gckMMU Mmu
    )
{
#ifdef __QNXNTO__
    gcuVIDMEM_NODE_PTR node, next;
#endif

    gcmkHEADER_ARG("Mmu=0x%x", Mmu);

    /* Verify the arguments. */
    gcmkVERIFY_OBJECT(Mmu, gcvOBJ_MMU);

#ifdef __QNXNTO__
    /* Free all associated virtual memory. */
    for (node = Mmu->nodeList; node != gcvNULL; node = next)
    {
        next = node->Virtual.next;
        gcmkVERIFY_OK(gckVIDMEM_Free(node));
    }
#endif

    while (Mmu->staticSTLB != gcvNULL)
    {
        gcsMMU_STLB_PTR pre = Mmu->staticSTLB;
        Mmu->staticSTLB = pre->next;

        if (pre->physical != gcvNULL)
        {
            gcmkVERIFY_OK(
                gckOS_FreeContiguous(Mmu->os,
                    pre->physical,
                    pre->logical,
                    pre->size));
        }

        if (pre->mtlbEntryNum != 0)
        {
            gcmkASSERT(pre->mtlbEntryNum == 1);
            _WritePageEntry(Mmu->mtlbLogical + pre->mtlbIndex, 0);
#if gcdMMU_TABLE_DUMP
            gckOS_Print("%s(%d): clean MTLB[%d]\n",
                __FUNCTION__, __LINE__,
                pre->mtlbIndex);
#endif
        }

        gcmkVERIFY_OK(gcmkOS_SAFE_FREE(Mmu->os, pre));
    }

    if (Mmu->hardware->mmuVersion != 0)
    {
        gcmkVERIFY_OK(
                gckOS_FreeContiguous(Mmu->os,
                    Mmu->mtlbPhysical,
                    (gctPOINTER) Mmu->mtlbLogical,
                    Mmu->mtlbSize));
    }

    /* Free the page table. */
    gcmkVERIFY_OK(
            gckOS_FreeContiguous(Mmu->os,
                Mmu->pageTablePhysical,
                (gctPOINTER) Mmu->pageTableLogical,
                Mmu->pageTableSize));

#ifdef __QNXNTO__
    /* Delete the node list mutex. */
    gcmkVERIFY_OK(gckOS_DeleteMutex(Mmu->os, Mmu->nodeMutex));
#endif

    /* Delete the page table mutex. */
    gcmkVERIFY_OK(gckOS_DeleteMutex(Mmu->os, Mmu->pageTableMutex));

    /* Mark the gckMMU object as unknown. */
    Mmu->object.type = gcvOBJ_UNKNOWN;

    /* Free the gckMMU object. */
    gcmkVERIFY_OK(gcmkOS_SAFE_FREE(Mmu->os, Mmu));

    /* Success. */
    gcmkFOOTER_NO();
    return gcvSTATUS_OK;
}

gceSTATUS
gckMMU_Construct(
    IN gckKERNEL Kernel,
    IN gctSIZE_T MmuSize,
    OUT gckMMU * Mmu
    )
{
#if gcdSHARED_PAGETABLE
    gceSTATUS status;
    gctPOINTER pointer;

    gcmkHEADER_ARG("Kernel=0x%08x", Kernel);

    if (sharedPageTable == gcvNULL)
    {
        gcmkONERROR(
                gckOS_Allocate(Kernel->os,
                               sizeof(struct _gcsSharedPageTable),
                               &pointer));
        sharedPageTable = pointer;

        gcmkONERROR(
                gckOS_ZeroMemory(sharedPageTable,
                    sizeof(struct _gcsSharedPageTable)));

        gcmkONERROR(_Construct(Kernel, MmuSize, &sharedPageTable->mmu));
    }
    else if (Kernel->hardware->mmuVersion == 0)
    {
        /* Set page table address. */
        gcmkONERROR(
            gckHARDWARE_SetMMU(Kernel->hardware, (gctPOINTER) sharedPageTable->mmu->pageTableLogical));
    }

    *Mmu = sharedPageTable->mmu;

    sharedPageTable->hardwares[sharedPageTable->reference] = Kernel->hardware;

    sharedPageTable->reference++;

    gcmkFOOTER_ARG("sharedPageTable->reference=%lu", sharedPageTable->reference);
    return gcvSTATUS_OK;

OnError:
    if (sharedPageTable)
    {
        if (sharedPageTable->mmu)
        {
            gcmkVERIFY_OK(gckMMU_Destroy(sharedPageTable->mmu));
        }

        gcmkVERIFY_OK(gcmkOS_SAFE_FREE(Kernel->os, sharedPageTable));
    }

    gcmkFOOTER();
    return status;
#elif gcdMIRROR_PAGETABLE
    gceSTATUS status;
    gctPOINTER pointer;

    gcmkHEADER_ARG("Kernel=0x%08x", Kernel);

    if (mirrorPageTable == gcvNULL)
    {
        gcmkONERROR(
            gckOS_Allocate(Kernel->os,
                           sizeof(struct _gcsMirrorPageTable),
                           &pointer));
        mirrorPageTable = pointer;

        gcmkONERROR(
            gckOS_ZeroMemory(mirrorPageTable,
                    sizeof(struct _gcsMirrorPageTable)));

        gcmkONERROR(
            gckOS_CreateMutex(Kernel->os, &mirrorPageTableMutex));
    }

    gcmkONERROR(_Construct(Kernel, MmuSize, Mmu));

    mirrorPageTable->mmus[mirrorPageTable->reference] = *Mmu;

    mirrorPageTable->hardwares[mirrorPageTable->reference] = Kernel->hardware;

    mirrorPageTable->reference++;

    gcmkFOOTER_ARG("mirrorPageTable->reference=%lu", mirrorPageTable->reference);
    return gcvSTATUS_OK;

OnError:
    if (mirrorPageTable && mirrorPageTable->reference == 0)
    {
        gcmkVERIFY_OK(gcmkOS_SAFE_FREE(Kernel->os, mirrorPageTable));
    }

    gcmkFOOTER();
    return status;
#else
    return _Construct(Kernel, MmuSize, Mmu);
#endif
}

gceSTATUS
gckMMU_Destroy(
    IN gckMMU Mmu
    )
{
#if gcdSHARED_PAGETABLE
    sharedPageTable->reference--;

    if (sharedPageTable->reference == 0)
    {
        if (sharedPageTable->mmu)
        {
            gcmkVERIFY_OK(_Destroy(Mmu));
        }

        gcmkVERIFY_OK(gcmkOS_SAFE_FREE(Mmu->os, sharedPageTable));
    }

    return gcvSTATUS_OK;
#elif gcdMIRROR_PAGETABLE
    mirrorPageTable->reference--;

    if (mirrorPageTable->reference == 0)
    {
        gcmkVERIFY_OK(gcmkOS_SAFE_FREE(Mmu->os, mirrorPageTable));
        gcmkVERIFY_OK(gcmkOS_SAFE_FREE(Mmu->os, mirrorPageTableMutex));
    }

    return _Destroy(Mmu);
#else
    return _Destroy(Mmu);
#endif
}

/*******************************************************************************
**
**  gckMMU_AllocatePages
**
**  Allocate pages inside the page table.
**
**  INPUT:
**
**      gckMMU Mmu
**          Pointer to an gckMMU object.
**
**      gctSIZE_T PageCount
**          Number of pages to allocate.
**
**  OUTPUT:
**
**      gctPOINTER * PageTable
**          Pointer to a variable that receives the base address of the page
**          table.
**
**      gctUINT32 * Address
**          Pointer to a variable that receives the hardware specific address.
*/
gceSTATUS
_AllocatePages(
    IN gckMMU Mmu,
    IN gctSIZE_T PageCount,
    OUT gctPOINTER * PageTable,
    OUT gctUINT32 * Address
    )
{
    gceSTATUS status;
    gctBOOL mutex = gcvFALSE;
    gctUINT32 index = 0, previous = ~0U, left;
    gctUINT32_PTR pageTable;
    gctBOOL gotIt;
    gctUINT32 address;

    gcmkHEADER_ARG("Mmu=0x%x PageCount=%lu", Mmu, PageCount);

    /* Verify the arguments. */
    gcmkVERIFY_OBJECT(Mmu, gcvOBJ_MMU);
    gcmkVERIFY_ARGUMENT(PageCount > 0);
    gcmkVERIFY_ARGUMENT(PageTable != gcvNULL);

    if (PageCount > Mmu->pageTableEntries)
    {
        gcmkPRINT("[galcore]: %s(%d): Run out of free page entry.",
                  __FUNCTION__, __LINE__);

        /* Not enough pages avaiable. */
        gcmkONERROR(gcvSTATUS_OUT_OF_RESOURCES);
    }

    /* Grab the mutex. */
    gcmkONERROR(gckOS_AcquireMutex(Mmu->os, Mmu->pageTableMutex, gcvINFINITE));
    mutex = gcvTRUE;

    /* Cast pointer to page table. */
    for (pageTable = Mmu->pageTableLogical, gotIt = gcvFALSE; !gotIt;)
    {
        /* Walk the heap list. */
        for (index = Mmu->heapList; !gotIt && (index < Mmu->pageTableEntries);)
        {
            /* Check the node type. */
            switch (gcmENTRY_TYPE(_ReadPageEntry(&pageTable[index])))
            {
            case gcvMMU_SINGLE:
                /* Single odes are valid if we only need 1 page. */
                if (PageCount == 1)
                {
                    gotIt = gcvTRUE;
                }
                else
                {
                    /* Move to next node. */
                    previous = index;
                    index    = _ReadPageEntry(&pageTable[index]) >> 8;
                }
                break;

            case gcvMMU_FREE:
                /* Test if the node has enough space. */
                if (PageCount <= (_ReadPageEntry(&pageTable[index]) >> 8))
                {
                    gotIt = gcvTRUE;
                }
                else
                {
                    /* Move to next node. */
                    previous = index;
                    index    = _ReadPageEntry(&pageTable[index + 1]);
                }
                break;

            default:
                gcmkFATAL("MMU table correcupted at index %u!", index);
                gcmkONERROR(gcvSTATUS_OUT_OF_RESOURCES);
            }
        }

        /* Test if we are out of memory. */
        if (index >= Mmu->pageTableEntries)
        {
            if (Mmu->freeNodes)
            {
                /* Time to move out the trash! */
                gcmkONERROR(_Collect(Mmu));
            }
            else
            {
                gcmkPRINT("[galcore]: %s(%d): Run out of free page entry.",
                          __FUNCTION__, __LINE__);

                /* Out of resources. */
                gcmkONERROR(gcvSTATUS_OUT_OF_RESOURCES);
            }
        }
    }

    switch (gcmENTRY_TYPE(_ReadPageEntry(&pageTable[index])))
    {
    case gcvMMU_SINGLE:
        /* Unlink single node from free list. */
        gcmkONERROR(
            _Link(Mmu, previous, _ReadPageEntry(&pageTable[index]) >> 8));
        break;

    case gcvMMU_FREE:
        /* Check how many pages will be left. */
        left = (_ReadPageEntry(&pageTable[index]) >> 8) - PageCount;
        switch (left)
        {
        case 0:
            /* The entire node is consumed, just unlink it. */
            gcmkONERROR(
                _Link(Mmu, previous, _ReadPageEntry(&pageTable[index + 1])));
            break;

        case 1:
            /* One page will remain.  Convert the node to a single node and
            ** advance the index. */
            _WritePageEntry(&pageTable[index], (_ReadPageEntry(&pageTable[index + 1]) << 8) | gcvMMU_SINGLE);
            index ++;
            break;

        default:
            /* Enough pages remain for a new node.  However, we will just adjust
            ** the size of the current node and advance the index. */
            _WritePageEntry(&pageTable[index], (left << 8) | gcvMMU_FREE);
            index += left;
            break;
        }
        break;
    }

    /* Mark node as used. */
    gcmkONERROR(_FillPageTable(&pageTable[index], PageCount, gcvMMU_USED));

    /* Return pointer to page table. */
    *PageTable = &pageTable[index];

    /* Build virtual address. */
    if (Mmu->hardware->mmuVersion == 0)
    {
        gcmkONERROR(
                gckHARDWARE_BuildVirtualAddress(Mmu->hardware, index, 0, &address));
    }
    else
    {
        gctUINT32 masterOffset = index / gcdMMU_STLB_4K_ENTRY_NUM
                               + Mmu->dynamicMappingStart;
        gctUINT32 slaveOffset = index % gcdMMU_STLB_4K_ENTRY_NUM;

        address = (masterOffset << gcdMMU_MTLB_SHIFT)
                | (slaveOffset << gcdMMU_STLB_4K_SHIFT);
    }

    if (Address != gcvNULL)
    {
        *Address = address;
    }

    /* Release the mutex. */
    gcmkVERIFY_OK(gckOS_ReleaseMutex(Mmu->os, Mmu->pageTableMutex));

    /* Success. */
    gcmkFOOTER_ARG("*PageTable=0x%x *Address=%08x",
                   *PageTable, gcmOPT_VALUE(Address));
    return gcvSTATUS_OK;

OnError:

    if (mutex)
    {
        /* Release the mutex. */
        gcmkVERIFY_OK(gckOS_ReleaseMutex(Mmu->os, Mmu->pageTableMutex));
    }

    /* Return the status. */
    gcmkFOOTER();
    return status;
}

/*******************************************************************************
**
**  gckMMU_FreePages
**
**  Free pages inside the page table.
**
**  INPUT:
**
**      gckMMU Mmu
**          Pointer to an gckMMU object.
**
**      gctPOINTER PageTable
**          Base address of the page table to free.
**
**      gctSIZE_T PageCount
**          Number of pages to free.
**
**  OUTPUT:
**
**      Nothing.
*/
gceSTATUS
_FreePages(
    IN gckMMU Mmu,
    IN gctPOINTER PageTable,
    IN gctSIZE_T PageCount
    )
{
    gctUINT32_PTR pageTable;
    gceSTATUS status;
    gctBOOL acquired = gcvFALSE;

    gcmkHEADER_ARG("Mmu=0x%x PageTable=0x%x PageCount=%lu",
                   Mmu, PageTable, PageCount);

    /* Verify the arguments. */
    gcmkVERIFY_OBJECT(Mmu, gcvOBJ_MMU);
    gcmkVERIFY_ARGUMENT(PageTable != gcvNULL);
    gcmkVERIFY_ARGUMENT(PageCount > 0);

    /* Convert the pointer. */
    pageTable = (gctUINT32_PTR) PageTable;

    gcmkONERROR(gckOS_AcquireMutex(Mmu->os, Mmu->pageTableMutex, gcvINFINITE));
    acquired = gcvTRUE;

#if gcdMMU_CLEAR_VALUE
    if (Mmu->hardware->mmuVersion == 0)
    {
        _FillPageTable(pageTable, PageCount, gcdMMU_CLEAR_VALUE);
    }
#endif

    if (PageCount == 1)
    {
        /* Single page node. */
        _WritePageEntry(pageTable,
                        (~((1U<<8)-1)) | gcvMMU_SINGLE
#if gcdUSE_MMU_EXCEPTION
                        /* Enable exception */
                        | 1 << 1
#endif
                        );
    }
    else
    {
        /* Mark the node as free. */
        _WritePageEntry(pageTable,
                        (PageCount << 8) | gcvMMU_FREE
#if gcdUSE_MMU_EXCEPTION
                        /* Enable exception */


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