1 /*

2 * This File contains all hardware dependent C code.

3 */

4

5

6 #include "VMS.h"

7

8 /*Create stack, then create __cdecl structure on it and put initialData and

9 * pointer to the new structure instance into the parameter positions on

10 * the stack

11 *Then put function pointer into nextInstrPt -- the stack is setup in std

12 * call structure, so jumping to function ptr is same as a GCC generated

13 * function call

14 *No need to save registers on old stack frame, because there's no old

15 * animator state to return to --

16 *

17 */

18 inline VirtProcr *

19 create_procr_helper( VirtProcr *newPr, VirtProcrFnPtr fnPtr,

20 void *initialData, void *stackLocs )

21 {

22 void *stackPtr;

23

24 newPr->startOfStack = stackLocs;

25 newPr->procrID = _VMSMasterEnv->numProcrsCreated++;

26 newPr->initialData = initialData;

27 newPr->requests = NULL;

28 newPr->schedSlot = NULL;

29

30 /*

31 * Hardware dependent part

32 */

33 //instead of calling the function directly, call a wrapper function to fetch

34 //arguments from stack

35 newPr->nextInstrPt = (VirtProcrFnPtr)&startVirtProcrFn;

36

37 //fnPtr takes two params -- void *initData & void *animProcr

38 //alloc stack locations, make stackPtr be the highest addr minus room

39 // for 2 params + return addr. Return addr (NULL) is in loc pointed to

40 // by stackPtr, initData at stackPtr + 8 bytes, animatingPr just above

41 stackPtr = ( (void *)stackLocs + VIRT_PROCR_STACK_SIZE - 4*sizeof(void*));

42

43 //setup __cdecl on stack -- coreloop will switch to stackPtr before jmp

44 *((VirtProcr**)stackPtr + 2 ) = newPr; //rightmost param

45 *((void**)stackPtr + 1 ) = initialData; //next param to left

46 *((void**)stackPtr) = (void*)fnPtr;

47

48 /*

49 * end of Hardware dependent part

50 */

51

52 newPr->stackPtr = stackPtr; //core loop will switch to this, then

53 newPr->framePtr = stackPtr; //suspend loop will save new stack & frame ptr

54

55 //============================= MEASUREMENT STUFF ========================

56 #ifdef STATS__TURN_ON_PROBES

57 //struct timeval timeStamp;

58 //gettimeofday( &(timeStamp), NULL);

59 //newPr->createPtInSecs = timeStamp.tv_sec +(timeStamp.tv_usec/1000000.0) -

60 // _VMSMasterEnv->createPtInSecs;

61 #endif

62

63 //========================================================================

64

65 return newPr;

66 }