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1 /*
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2 * Copyright 2010 OpenSourceCodeStewardshipFoundation
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3 *
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4 * Licensed under BSD
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <malloc.h>
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10
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11 #include "VMS.h"
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12 #include "Queue_impl/BlockingQueue.h"
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13
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14
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15 /*Setup has two phases:
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16 * 1) Semantic layer first calls init_VMS, which creates masterEnv, and puts
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17 * the master virt procr into the work-queue, ready for first "call"
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18 * 2) Semantic layer then does its own init, which creates the seed virt
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19 * procr inside the semantic layer, ready to schedule it when
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20 * asked by the first run of the masterLoop.
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21 *
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22 *This part is bit weird because VMS really wants to be "always there", and
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23 * have applications attach and detach.. for now, this VMS is part of
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24 * the app, so the VMS system starts up as part of running the app.
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25 *
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26 *The semantic layer is isolated from the VMS internals by making the
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27 * semantic layer do setup to a state that it's ready with its
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28 * initial virt procrs, ready to schedule them to slots when the masterLoop
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29 * asks. Without this pattern, the semantic layer's setup would
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30 * have to modify slots directly to assign the initial virt-procrs, and put
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31 * them into the workQ itself, breaking the isolation completely.
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32 *
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33 *
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34 *The semantic layer creates the initial virt procr(s), and adds its
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35 * own environment to masterEnv, and fills in the pointers to
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36 * the requestHandler and slaveScheduler plug-in functions
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37 */
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38
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39 void
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40 create_sched_slots( MasterEnv *masterEnv );
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41
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42
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43 /*This allocates VMS data structures, populates the master VMSProc,
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44 * and master environment, and returns the master environment to the semantic
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45 * layer.
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46 */
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47 void
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48 VMS__init()
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49 { MasterEnv *masterEnv;
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50 CASQueueStruc *workQ;
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51
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52 //Make the central work-queue
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53 _VMSWorkQ = makeCASQ();
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54 workQ = _VMSWorkQ;
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55
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56 _VMSMasterEnv = malloc( sizeof(MasterEnv) );
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57 masterEnv = _VMSMasterEnv;
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58
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59 //create the master virtual processor
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60 masterEnv->masterVirtPr = VMS__create_procr( &masterLoop, masterEnv );
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61
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62 create_sched_slots( masterEnv );
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63
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64 //Set slot 0 to be the master virt procr & set flags just in case
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65 masterEnv->schedSlots[0]->needsProcrAssigned = FALSE; //says don't touch
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66 masterEnv->schedSlots[0]->workIsDone = FALSE; //says don't touch
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67 masterEnv->schedSlots[0]->procrAssignedToSlot = masterEnv->masterVirtPr;
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68
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69 //First core loop to start up gets this, which will schedule seed Pr
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70 //TODO: debug: check address of masterVirtPr
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71 //TODO: commented out for debugging -- put it back in!!
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72 // writeCASQ( masterEnv->masterVirtPr, workQ );
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73
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74 numProcrsCreated = 1;
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75 }
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76
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77
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78 void
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79 create_sched_slots( MasterEnv *masterEnv )
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80 { SchedSlot **schedSlots, **filledSlots;
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81 int i;
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82
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83 schedSlots = malloc( NUM_SCHED_SLOTS * sizeof(SchedSlot *) );
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84 filledSlots = malloc( NUM_SCHED_SLOTS * sizeof(SchedSlot *) );
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85 masterEnv->schedSlots = schedSlots;
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86 masterEnv->filledSlots = filledSlots;
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87
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88 for( i = 0; i < NUM_SCHED_SLOTS; i++ )
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89 {
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90 schedSlots[i] = malloc( sizeof(SchedSlot) );
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91
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92 //Set state to mean "handling requests done, slot needs filling"
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93 schedSlots[i]->workIsDone = FALSE;
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94 schedSlots[i]->needsProcrAssigned = TRUE;
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95 }
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96 }
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97
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98
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99 /*Semantic layer calls this when it want the system to start running..
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100 *
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101 *This creates the core loops, pins them to physical cores, gives them the
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102 * pointer to the workQ, and starts them running.
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103 */
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104 void
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105 VMS__start()
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106 { int coreIdx;
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107
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108 //TODO: Save "orig" stack pointer and frame ptr -- restore in VMS__end()
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109 //Create the win threads that animate the core loops
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110 for( coreIdx=0; coreIdx < NUM_CORES; coreIdx++ )
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111 {
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112 coreLoopThdParams[coreIdx] = (ThdParams *)malloc( sizeof(ThdParams) );
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113 coreLoopThdParams[coreIdx]->coreNum = coreIdx;
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114
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115 coreLoopThdHandles[coreIdx] =
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116 CreateThread ( NULL, // Security attributes
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117 0, // Stack size
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118 coreLoop,
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119 coreLoopThdParams[coreIdx],
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120 CREATE_SUSPENDED,
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121 &(coreLoopThdIds[coreIdx])
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122 );
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123 ResumeThread( coreLoopThdHandles[coreIdx] ); //starts thread
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124 }
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125 }
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126
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127
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128
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129 /*Create stack, then create __cdecl structure on it and put initialData and
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130 * pointer to the new structure instance into the parameter positions on
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131 * the stack
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132 *Then put function pointer into nextInstrPt -- the stack is setup in std
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133 * call structure, so jumping to function ptr is same as a GCC generated
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134 * function call
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135 *No need to save registers on old stack frame, because there's no old
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136 * animator state to return to --
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137 *
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138 */
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139 VirtProcr *
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140 VMS__create_procr( VirtProcrFnPtr fnPtr, void *initialData )
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141 { VirtProcr *newPr;
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142 char *stackLocs, *stackPtr;
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143
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144 newPr = malloc( sizeof(VirtProcr) );
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145 newPr->procrID = numProcrsCreated++;
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146 newPr->nextInstrPt = fnPtr;
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147 newPr->initialData = initialData;
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148
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149 //fnPtr takes two params -- void *initData & void *animProcr
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150 //alloc stack locations, make stackPtr be the highest addr minus room
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151 // for 2 params + return addr. Return addr (NULL) is in loc pointed to
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152 // by stackPtr, initData at stackPtr + 4 bytes, animatingPr just above
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153 stackLocs = malloc( 0x100000 ); //1 meg stack -- default Win thread's size
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154 stackPtr = ( (char *)stackLocs + 0x100000 - 0x10 );
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155 //setup __cdecl on stack -- coreloop will switch to stackPtr before jmp
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156 *( (int *)stackPtr + 2 ) = (int) newPr; //rightmost param -- 32bit pointer
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157 *( (int *)stackPtr + 1 ) = (int) initialData; //next param to left
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158 newPr->stackPtr = stackPtr; //core loop will switch to this, then
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159 newPr->framePtr = stackPtr; //suspend loop will save new stack & frame ptr
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160
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161 return newPr;
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162 }
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163
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164
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165 /*This inserts the semantic-layer's data into the standard VMS carrier
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166 */
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167 inline void
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168 VMS__send_sem_request( void *semReqData, VirtProcr *callingPr )
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169 { SlaveReqst *req;
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170
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171 req = malloc( sizeof(SlaveReqst) );
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172 req->slaveFrom = callingPr;
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173 req->semReqData = semReqData;
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174 req->nextRequest = callingPr->requests;
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175 callingPr->requests = req;
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176 }
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177
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178 /*there is a label inside this function -- save the addr of this label in
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179 * the callingPr struc, as the pick-up point from which to start the next
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180 * work-unit for that procr. If turns out have to save registers, then
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181 * save them in the procr struc too. Then do assembly jump to the CoreLoop's
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182 * "done with work-unit" label. The procr struc is in the request in the
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183 * slave that animated the just-ended work-unit, so all the state is saved
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184 * there, and will get passed along, inside the request handler, to the
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185 * next work-unit for that procr.
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186 */
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187 void
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188 VMS__suspend_processor( VirtProcr *callingPr )
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189 { void *jmpPt, *stackPtrAddr, *framePtrAddr, *coreLoopStackPtr;
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190 void *coreLoopFramePtr;
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191 int coreIdx;
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192
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193 //The request to master will cause this suspended virt procr to get
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194 // scheduled again at some future point -- to resume, core loop jumps
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195 // to the resume point (below), which causes restore of saved regs and
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196 // "return" from this call.
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197 callingPr->nextInstrPt = &&ResumePt;
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198
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199 //return ownership of the virt procr and sched slot to Master virt pr
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200 callingPr->schedSlot->workIsDone = TRUE;
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201 // coreIdx = callingPr->coreAnimatedBy;
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202
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203 // stackPtrAddr = &(callingPr->stackPtr);
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204 // framePtrAddr = &(callingPr->framePtr);
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205
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206 jmpPt = callingPr->coreLoopStartPt;
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207 coreLoopFramePtr = callingPr->coreLoopFramePtr;//need this only
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208 coreLoopStackPtr = callingPr->coreLoopStackPtr;
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209 // coreLoopStackPtr = coreLoopThdParams[ coreIdx ]->stackPtr;//prob dont need
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210
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211 //Save the virt procr's stack and frame ptrs, restore coreloop's frame
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212 // ptr, then jump back to "start" of core loop
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213 asm volatile("movl %%esp, %0; \
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214 movl %%ebp, %1; \
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215 movl %3, %%eax; \
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216 movl %2, %%ebp; \
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217 jmp %%eax " \
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218 /* outputs */ : "=g" (callingPr->stackPtr), "=g" (callingPr->framePtr) \
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219 /* inputs */ : "g"(coreLoopFramePtr), "g" (jmpPt) \
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220 /* clobber */ : "memory", "%eax", "%ebx", "%ecx", "%edx", "%edi","%esi" \
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221 ); //list everything as clobbered to force GCC to save all
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222 // live vars that are in regs on stack before this
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223 // assembly, so that stack pointer is correct, before jmp
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224
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225 ResumePt:
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226 return;
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227 }
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228
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229 void
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230 VMS__dissipate_animating_processor( VirtProcr *animatingPr )
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231 {
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232
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233 }
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234
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235 /*This runs in main thread -- so can only signal to the core loop to shut
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236 * itself down --
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237 *
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238 *Want the master to decide when to shut down -- when semantic layer tells it
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239 * to -- say, when all the application-virtual processors have dissipated.
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240 *
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241 *Maybe return a special code from scheduling plug-in.. master checks and
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242 * when sees, it shuts down the core loops -- does this by scheduling a
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243 * special virt processor whose next instr pt is the core-end label.
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244 */
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245 void
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246 VMS__shutdown()
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247 { int coreIdx;
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248 VirtProcr *shutDownPr;
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249
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250 //TODO: restore the "orig" stack pointer and frame ptr saved in VMS__start
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251 //create a "special" virtual processor, one for each core loop that has
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252 // the "loop end" point as its "next instr" point -- when the core loop
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253 // jumps to animate the virt procr, the jump lands it at its own
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254 // shut-down code.
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255 for( coreIdx=0; coreIdx < NUM_CORES; coreIdx++ )
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256 {
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257 shutDownPr = VMS__create_procr( NULL, NULL );
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258 shutDownPr->nextInstrPt = _VMSMasterEnv->coreLoopShutDownPt;
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259 }
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260 }
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261
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262
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263
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264 inline TSCount getTSCount()
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265 { unsigned int low, high;
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266 TSCount out;
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267
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268 saveTimeStampCountInto( low, high );
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269 out = high;
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270 out = (out << 32) + low;
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271 return out;
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272 }
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273
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