source: rtems/c/src/lib/libbsp/powerpc/gen5200/bestcomm/tasksetup_bdtable.c @ c8423f9

/******************************************************************************
*
* Copyright (c) 2004 Freescale Semiconductor, Inc.
* 
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
* 
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
* 
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
******************************************************************************/

#include "bestcomm_api.h"
#include "task_api/tasksetup_bdtable.h"
#include "include/mgt5200/mgt5200.h"

#ifdef __MWERKS__
__declspec(section ".text") extern const uint32 taskTable;
__declspec(section ".text") extern const uint32 taskTableBytes;
__declspec(section ".text") extern const uint32 taskTableTasks;
__declspec(section ".text") extern const uint32 offsetEntry;
#else
extern const uint32 taskTable;
extern const uint32 taskTableBytes;
extern const uint32 taskTableTasks;
extern const uint32 offsetEntry;
#endif

TaskBDIdxTable_t TaskBDIdxTable[MAX_TASKS];

static uint8 *TaskTableFree = 0;

void TaskSetup_BDTable(volatile uint32 *BasePtr, volatile uint32 *LastPtr, volatile uint32 *StartPtr,
                                           int TaskNum, uint32 NumBD, uint16 MaxBD,
                                           uint8 NumPtr, ApiConfig_t ApiConfig, uint32 Status)
{
        int i, j;
        uint32 *ptr;

        /*
         * If another process has not used SRAM already, then the start value
         * will have to be passed in using the TasksSetSramOffset() function.
         */
        if (SramOffsetGlobal == 0) {
                SramOffsetGlobal = taskTableBytes;
        }

        TaskTableFree = MBarGlobal + MBAR_SRAM + SramOffsetGlobal;

        /*
         * First time through the Buffer Descriptor table configuration
         * set the buffer descriptor table with parameters that will not
         * change since they are determined by the task itself. The
         * SramOffsetGlobal variable must be updated to reflect the new SRAM
         * space used by the buffer descriptor table.  The next time through
         * this function (i.e. TaskSetup called again) the only parameters
         * that should be changed are the LastPtr pointers and the NumBD part
         * of the table.
         */
        if (TaskBDIdxTable[TaskNum].BDTablePtr == 0) {
                TaskBDIdxTable[TaskNum].BDTablePtr  = TaskTableFree;
                TaskBDIdxTable[TaskNum].numPtr      = NumPtr;
                TaskBDIdxTable[TaskNum].apiConfig   = ApiConfig;
                TaskBDIdxTable[TaskNum].BDStartPtr  = StartPtr;

                *StartPtr = *BasePtr  = (uint32)((uint32)TaskBDIdxTable[TaskNum].BDTablePtr
                                        + MBarPhysOffsetGlobal);

                switch (NumPtr) {
                        case 1:
                                SramOffsetGlobal += MaxBD*sizeof(TaskBD1_t);
                                break;
                        case 2:
                                SramOffsetGlobal += MaxBD*sizeof(TaskBD2_t);
                                break;
                        default:
                                /* error */
                                break;
                }
        }

        TaskBDIdxTable[TaskNum].currBDInUse     = 0;
        TaskBDIdxTable[TaskNum].numBD           = (uint16)NumBD;
        switch (NumPtr) {
                case 1:
                        *LastPtr = (uint32)(*BasePtr + sizeof(TaskBD1_t) * (NumBD - 1));
                        break;
                case 2:
                        *LastPtr = (uint32)(*BasePtr + sizeof(TaskBD2_t) * (NumBD - 1));
                        break;
                default:
                        /* error */
                        break;
        }

        /*
         * Set the status bits. Clear the data pointers.
         */
        if (MaxBD > 0) {
                ptr = TaskBDIdxTable[TaskNum].BDTablePtr;
                for (i = 0; i < NumBD; i++) {
                        *(ptr++) = Status;
                        for (j = 0; j < NumPtr; j++) {
                                *(ptr++) = 0x0;
                        }
                }
        }
}