src/add-ons/accelerants/intel_810/engine.cpp

   1 /*
   2  * Copyright 2007-2012 Haiku, Inc.  All rights reserved.
   3  * Distributed under the terms of the MIT license.
   4  *
   5  * Authors:
   6  *              Gerald Zajac
   7  */
   8
   9
  10 #include "accelerant.h"
  11 #include "i810_regs.h"
  12
  13
  14 static engine_token sEngineToken = { 1, B_2D_ACCELERATION, NULL };
  15
  16
  17 uint32
  18 AccelerantEngineCount(void)
  19 {
  20         return 1;
  21 }
  22
  23
  24 status_t
  25 AcquireEngine(uint32 capabilities, uint32 maxWait,
  26         sync_token* syncToken, engine_token** engineToken)
  27 {
  28         (void)capabilities;     // avoid compiler warning for unused arg
  29         (void)maxWait;          // avoid compiler warning for unused arg
  30
  31         if (gInfo.sharedInfo->engineLock.Acquire() != B_OK)
  32                 return B_ERROR;
  33
  34         if (syncToken)
  35                 SyncToToken(syncToken);
  36
  37         *engineToken = &sEngineToken;
  38         return B_OK;
  39 }
  40
  41
  42 status_t
  43 ReleaseEngine(engine_token* engineToken, sync_token* syncToken)
  44 {
  45         if (syncToken)
  46                 GetSyncToken(engineToken, syncToken);
  47
  48         gInfo.sharedInfo->engineLock.Release();
  49         return B_OK;
  50 }
  51
  52
  53 void
  54 WaitEngineIdle(void)
  55 {
  56         // Wait until engine is idle.
  57
  58         int k = 10000000;
  59
  60         while ((INREG16(INST_DONE) & 0x7B) != 0x7B && k > 0)
  61                 k--;
  62 }
  63
  64
  65 status_t
  66 GetSyncToken(engine_token* engineToken, sync_token* syncToken)
  67 {
  68         syncToken->engine_id = engineToken->engine_id;
  69         syncToken->counter = 0;
  70         return B_OK;
  71 }
  72
  73
  74 status_t
  75 SyncToToken(sync_token* syncToken)
  76 {
  77         (void)syncToken;
  78                 // avoid compiler warning for unused arg
  79
  80         WaitEngineIdle();
  81         return B_OK;
  82 }