723 lines
19 KiB
C
723 lines
19 KiB
C
/*** ctxt.c - Context Block handling functions
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*
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* Copyright (c) 1996,1997 Microsoft Corporation
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* Author: Michael Tsang (MikeTs)
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* Created 06/13/97
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*
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* MODIFICATION HISTORY
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*/
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#include "pch.h"
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#ifdef LOCKABLE_PRAGMA
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#pragma ACPI_LOCKABLE_DATA
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#pragma ACPI_LOCKABLE_CODE
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#endif
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NTSTATUS
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LOCAL
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NewContext(
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PPCTXT ppctxt
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)
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/*++
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Routine Description:
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Allocate a new context structure from tne NonPaged Lookaside
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List. Also keep track of the high water marks so that the OS
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can intelligently decide what the "appropriate" number of
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contexts that it should allocate.
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Note that this code raises the possibility that if we detect
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an out-of-memory error, we might be able to save a registry
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key that includes a new larger number (to prevent this problem
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in the first place). Adaptive recovery?
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Arguments:
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ppctxt - address of to hold the newly created context
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Return Value:
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NTSTATUS
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--*/
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{
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TRACENAME("NEWCONTEXT")
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KIRQL oldIrql;
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NTSTATUS rc = STATUS_SUCCESS;
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ENTER(2, ("NewContext(ppctxt=%x)\n", ppctxt));
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*ppctxt = ExAllocateFromNPagedLookasideList(
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&AMLIContextLookAsideList
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);
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if (*ppctxt == NULL) {
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AMLI_WARN(("NewContext: Could not Allocate New Context"));
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rc = AMLIERR_OUT_OF_MEM;
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} else {
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//
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// Bookkeeping for memory resources to determine the high
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// water mark
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//
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KeAcquireSpinLock(&gdwGContextSpinLock, &oldIrql );
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gdwcCTObjs++;
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if (gdwcCTObjs > 0 &&
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(ULONG) gdwcCTObjs > gdwcCTObjsMax) {
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gdwcCTObjsMax = gdwcCTObjs;
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}
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KeReleaseSpinLock(&gdwGContextSpinLock, oldIrql );
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//
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// Context Initialization
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//
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InitContext(*ppctxt, gdwCtxtBlkSize);
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AcquireMutex(&gmutCtxtList);
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ListInsertTail(&(*ppctxt)->listCtxt, &gplistCtxtHead);
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ReleaseMutex(&gmutCtxtList);
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}
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EXIT(2, ("NewContext=%x (pctxt=%x)\n", rc, *ppctxt));
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return rc;
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} //NewContext
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VOID
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LOCAL
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FreeContext(
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PCTXT pctxt
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)
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/*++
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Routine Description:
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This is routine is called when a context is no longer required
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and should be returned to the system's LookAside list
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Arguments:
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pctxt - Address of the context to be freed
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Return Value:
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None
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--*/
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{
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TRACENAME("FREECONTEXT")
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KIRQL oldIrql;
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ENTER(2, ("FreeContext(pctxt=%x)\n", pctxt));
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ASSERT(pctxt->powner == NULL);
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//
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// Need to hold the proper mutex to touch the global ctxt list
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//
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AcquireMutex(&gmutCtxtList);
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ListRemoveEntry(&pctxt->listCtxt, &gplistCtxtHead);
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if (pctxt->pplistCtxtQueue != NULL) {
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ListRemoveEntry(&pctxt->listQueue, pctxt->pplistCtxtQueue);
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}
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//
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// Done with the global mutex
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//
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ReleaseMutex(&gmutCtxtList);
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//
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// Release any allocated storage that might not have been cleaned up
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//
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FreeDataBuffs(&pctxt->Result, 1);
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//
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// Bookkeeping for memory resources to determine the high
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// water mark
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//
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KeAcquireSpinLock(&gdwGContextSpinLock, &oldIrql );
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gdwcCTObjs--;
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ASSERT(gdwcCTObjs >= 0);
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KeReleaseSpinLock(&gdwGContextSpinLock, oldIrql );
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//
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// Log the end of a method
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//
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ACPIWMILOGEVENT((1,
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EVENT_TRACE_TYPE_END,
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GUID_List[AMLI_LOG_GUID],
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"Object = %s",
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GetObjectPath(pctxt->pnsObj)
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));
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//
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// Return the context to the nonpaged lookaside list
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//
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ExFreeToNPagedLookasideList(&AMLIContextLookAsideList, pctxt);
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EXIT(2, ("FreeContext!\n"));
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} //FreeContext
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/***LP InitContext - initialize a given context block
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*
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* ENTRY
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* pctxt -> CTXT
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* dwLen - length of context block
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*
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* EXIT
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* None
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*/
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VOID LOCAL InitContext(PCTXT pctxt, ULONG dwLen)
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{
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TRACENAME("INITCONTEXT")
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ENTER(2, ("InitContext(pctxt=%x,Len=%d)\n", pctxt, dwLen));
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MEMZERO(pctxt, sizeof(CTXT) - sizeof(HEAP));
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pctxt->dwSig = SIG_CTXT;
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pctxt->pbCtxtEnd = (PUCHAR)pctxt + dwLen;
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pctxt->pheapCurrent = &pctxt->LocalHeap;
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// #ifdef DEBUGGER
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// KeQuerySystemTime(&pctxt->Timestamp);
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// #endif
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KeInitializeDpc(&pctxt->Dpc, TimeoutCallback, pctxt);
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KeInitializeTimer(&pctxt->Timer);
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InitHeap(&pctxt->LocalHeap,
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(ULONG)(pctxt->pbCtxtEnd - (PUCHAR)&pctxt->LocalHeap));
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pctxt->LocalHeap.pheapHead = &pctxt->LocalHeap;
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EXIT(2, ("InitContext!\n"));
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} //InitContext
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/***LP IsStackEmpty - determine if the stack is empty
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*
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* ENTRY
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* pctxt -> CTXT
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*
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* EXIT-SUCCESS
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* returns TRUE - stack is empty
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* EXIT-FAILURE
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* returns FALSE
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*/
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BOOLEAN LOCAL IsStackEmpty(PCTXT pctxt)
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{
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TRACENAME("ISSTACKEMPTY")
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BOOLEAN rc;
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ENTER(2, ("IsStackEmpty(pctxt=%p)\n", pctxt));
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rc = (BOOLEAN)(pctxt->LocalHeap.pbHeapEnd == pctxt->pbCtxtEnd);
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EXIT(2, ("IsStackEmpty=%x\n", rc));
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return rc;
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} //IsStackEmpty
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/***LP PushFrame - Push a new frame on the stack
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*
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* ENTRY
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* pctxt -> CTXT
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* dwSig - frame object signature
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* dwLen - size of the frame object
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* pfnParse -> frame object parse function
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* ppvFrame -> to hold pointer to the newly pushed frame (can be NULL)
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*
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* EXIT-SUCCESS
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* returns STATUS_SUCCESS
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* EXIT-FAILURE
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* returns AMLIERR_ code
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*/
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NTSTATUS LOCAL PushFrame(PCTXT pctxt, ULONG dwSig, ULONG dwLen,
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PFNPARSE pfnParse, PVOID *ppvFrame)
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{
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TRACENAME("PUSHFRAME")
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NTSTATUS rc = STATUS_SUCCESS;
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ENTER(2, ("PushFrame(pctxt=%p,Sig=%s,Len=%d,pfnParse=%p,ppvFrame=%p)\n",
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pctxt, NameSegString(dwSig), dwLen, pfnParse, ppvFrame));
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//
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// Check to see if we have enough space, make sure it doesn't run into the
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// heap.
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//
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if (pctxt->LocalHeap.pbHeapEnd - dwLen >= pctxt->LocalHeap.pbHeapTop)
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{
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PFRAMEHDR pfh;
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pctxt->LocalHeap.pbHeapEnd -= dwLen;
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pfh = (PFRAMEHDR)pctxt->LocalHeap.pbHeapEnd;
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MEMZERO(pfh, dwLen);
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pfh->dwSig = dwSig;
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pfh->dwLen = dwLen;
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pfh->pfnParse = pfnParse;
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if (ppvFrame != NULL)
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{
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*ppvFrame = pfh;
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}
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#ifdef DEBUG
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if ((ULONG)(pctxt->pbCtxtEnd - pctxt->LocalHeap.pbHeapEnd) >
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gdwLocalStackMax)
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{
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gdwLocalStackMax = (ULONG)(pctxt->pbCtxtEnd -
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pctxt->LocalHeap.pbHeapEnd);
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}
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#endif
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}
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else
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{
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rc = AMLI_LOGERR(AMLIERR_STACK_OVERFLOW,
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("PushFrame: stack ran out of space"));
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}
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EXIT(2, ("PushFrame=%x (StackTop=%x)\n", rc, pctxt->LocalHeap.pbHeapEnd));
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return rc;
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} //PushFrame
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/***LP PopFrame - Pop a frame off the stack
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*
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* ENTRY
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* pctxt -> CTXT
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*
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* EXIT
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* None
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*/
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VOID LOCAL PopFrame(PCTXT pctxt)
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{
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TRACENAME("POPFRAME")
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ENTER(2, ("PopFrame(pctxt=%p)\n", pctxt));
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ASSERT(!IsStackEmpty(pctxt));
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ASSERT(((PFRAMEHDR)pctxt->LocalHeap.pbHeapEnd)->dwSig != 0);
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pctxt->LocalHeap.pbHeapEnd +=
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((PFRAMEHDR)pctxt->LocalHeap.pbHeapEnd)->dwLen;
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EXIT(2, ("PopFrame! (StackTop=%p)\n", pctxt->LocalHeap.pbHeapEnd));
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} //PopFrame
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/***LP PushPost - Push a Post frame on the stack
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*
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* ENTRY
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* pctxt -> CTXT
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* pfnPost -> post processing function
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* uipData1 - data1
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* uipData2 - data2
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* pdataResult -> result object
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*
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* EXIT-SUCCESS
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* returns STATUS_SUCCESS
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* EXIT-FAILURE
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* returns AMLIERR_ code
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*/
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NTSTATUS LOCAL PushPost(PCTXT pctxt, PFNPARSE pfnPost, ULONG_PTR uipData1,
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ULONG_PTR uipData2, POBJDATA pdataResult)
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{
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TRACENAME("PUSHPOST")
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NTSTATUS rc = STATUS_SUCCESS;
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PPOST ppost;
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ENTER(2, ("PushPost(pctxt=%x,pfnPost=%x,Data1=%x,Data2=%x,pdataResult=%x)\n",
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pctxt, pfnPost, uipData1, uipData2, pdataResult));
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if ((rc = PushFrame(pctxt, SIG_POST, sizeof(POST), pfnPost, &ppost)) ==
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STATUS_SUCCESS)
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{
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ppost->uipData1 = uipData1;
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ppost->uipData2 = uipData2;
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ppost->pdataResult = pdataResult;
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}
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EXIT(2, ("PushPost=%x (ppost=%x)\n", rc, ppost));
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return rc;
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} //PushPost
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/***LP PushScope - Push a ParseScope frame on the stack
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*
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* ENTRY
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* pctxt -> CTXT
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* pbOpBegin -> beginning of scope
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* pbOpEnd -> end of scope
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* pbOpRet -> return address after end of scope (NULL if continue on)
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* pnsScope -> new scope
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* powner -> new owner
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* pheap -> new heap
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* pdataResult -> result object
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*
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* EXIT-SUCCESS
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* returns STATUS_SUCCESS
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* EXIT-FAILURE
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* returns AMLIERR_ code
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*/
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NTSTATUS LOCAL PushScope(PCTXT pctxt, PUCHAR pbOpBegin, PUCHAR pbOpEnd,
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PUCHAR pbOpRet, PNSOBJ pnsScope, POBJOWNER powner,
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PHEAP pheap, POBJDATA pdataResult)
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{
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TRACENAME("PUSHSCOPE")
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NTSTATUS rc = STATUS_SUCCESS;
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PSCOPE pscope;
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ENTER(2, ("PushScope(pctxt=%x,pbOpBegin=%x,pbOpEnd=%x,pbOpRet=%x,pnsScope=%x,pheap=%x,pdataResult=%x)\n",
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pctxt, pbOpBegin, pbOpEnd, pbOpRet, pnsScope, pheap,
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pdataResult));
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if ((rc = PushFrame(pctxt, SIG_SCOPE, sizeof(SCOPE), ParseScope, &pscope))
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== STATUS_SUCCESS)
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{
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pctxt->pbOp = pbOpBegin;
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pscope->pbOpEnd = pbOpEnd;
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pscope->pbOpRet = pbOpRet;
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pscope->pnsPrevScope = pctxt->pnsScope;
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pctxt->pnsScope = pnsScope;
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pscope->pownerPrev = pctxt->powner;
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pctxt->powner = powner;
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pscope->pheapPrev = pctxt->pheapCurrent;
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pctxt->pheapCurrent = pheap;
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pscope->pdataResult = pdataResult;
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}
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EXIT(2, ("PushScope=%x (pscope=%x)\n", rc, pscope));
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return rc;
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} //PushScope
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/***LP PushCall - Push a Call frame on the stack
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*
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* ENTRY
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* pctxt -> CTXT
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* pnsMethod -> method object
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* pdataResult -> result object
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*
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* EXIT-SUCCESS
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* returns STATUS_SUCCESS
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* EXIT-FAILURE
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* returns AMLIERR_ code
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*/
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NTSTATUS LOCAL PushCall(PCTXT pctxt, PNSOBJ pnsMethod, POBJDATA pdataResult)
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{
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TRACENAME("PUSHCALL")
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NTSTATUS rc = STATUS_SUCCESS;
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PCALL pcall;
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ENTER(2, ("PushCall(pctxt=%x,pnsMethod=%s,pdataResult=%x)\n",
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pctxt, GetObjectPath(pnsMethod), pdataResult));
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ASSERT((pnsMethod == NULL) ||
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(pnsMethod->ObjData.dwDataType == OBJTYPE_METHOD));
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if ((rc = PushFrame(pctxt, SIG_CALL, sizeof(CALL), ParseCall, &pcall))
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== STATUS_SUCCESS)
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{
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if (pnsMethod != NULL)
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{
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PMETHODOBJ pm = (PMETHODOBJ)pnsMethod->ObjData.pbDataBuff;
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pcall->pnsMethod = pnsMethod;
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if (pm->bMethodFlags & METHOD_SERIALIZED)
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{
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pcall->FrameHdr.dwfFrame |= CALLF_NEED_MUTEX;
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}
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pcall->icArgs = (int)(pm->bMethodFlags & METHOD_NUMARG_MASK);
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if (pcall->icArgs > 0)
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{
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if ((pcall->pdataArgs = NEWODOBJ(pctxt->pheapCurrent,
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sizeof(OBJDATA)*pcall->icArgs))
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== NULL)
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{
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rc = AMLI_LOGERR(AMLIERR_OUT_OF_MEM,
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("PushCall: failed to allocate argument objects"));
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}
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else
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{
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MEMZERO(pcall->pdataArgs, sizeof(OBJDATA)*pcall->icArgs);
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}
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}
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}
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else
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{
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//
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// This is a dummy call frame for AMLILoadDDB. We just need it
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// for its Locals array in case there is ASL referencing them.
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// But we don't really want to parse a call frame, so let's set
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// it to final clean up stage.
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//
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ASSERT(pctxt->pcall == NULL);
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pctxt->pcall = pcall;
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pcall->FrameHdr.dwfFrame = 4;
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}
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pcall->pdataResult = pdataResult;
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}
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EXIT(2, ("PushCall=%x (pcall=%x)\n", rc, pcall));
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return rc;
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} //PushCall
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/***LP PushTerm - Push a Term frame on the stack
|
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*
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* ENTRY
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* pctxt -> CTXT
|
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* pbOpTerm -> term opcode
|
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* pbScopeEnd -> end of current scope
|
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* pamlterm -> AMLTERM
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* pdataResult -> result object
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*
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* EXIT-SUCCESS
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* returns STATUS_SUCCESS
|
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* EXIT-FAILURE
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* returns AMLIERR_ code
|
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*/
|
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NTSTATUS LOCAL PushTerm(PCTXT pctxt, PUCHAR pbOpTerm, PUCHAR pbScopeEnd,
|
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PAMLTERM pamlterm, POBJDATA pdataResult)
|
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{
|
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TRACENAME("PUSHTERM")
|
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NTSTATUS rc = STATUS_SUCCESS;
|
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PTERM pterm;
|
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|
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ENTER(2, ("PushTerm(pctxt=%x,pbOpTerm=%x,pbScopeEnd=%x,pamlterm=%x,pdataResult=%x)\n",
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pctxt, pbOpTerm, pbScopeEnd, pamlterm, pdataResult));
|
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|
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if ((rc = PushFrame(pctxt, SIG_TERM, sizeof(TERM), ParseTerm, &pterm)) ==
|
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STATUS_SUCCESS)
|
|
{
|
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pterm->pbOpTerm = pbOpTerm;
|
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pterm->pbScopeEnd = pbScopeEnd;
|
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pterm->pamlterm = pamlterm;
|
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pterm->pdataResult = pdataResult;
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pterm->icArgs = pamlterm->pszArgTypes? STRLEN(pamlterm->pszArgTypes): 0;
|
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if (pterm->icArgs > 0)
|
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{
|
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if ((pterm->pdataArgs = NEWODOBJ(pctxt->pheapCurrent,
|
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sizeof(OBJDATA)*pterm->icArgs)) ==
|
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NULL)
|
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{
|
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rc = AMLI_LOGERR(AMLIERR_OUT_OF_MEM,
|
|
("PushTerm: failed to allocate argument objects"));
|
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}
|
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else
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{
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MEMZERO(pterm->pdataArgs, sizeof(OBJDATA)*pterm->icArgs);
|
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}
|
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}
|
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}
|
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EXIT(2, ("PushTerm=%x (pterm=%x)\n", rc, pterm));
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return rc;
|
|
} //PushTerm
|
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|
|
/***LP RunContext - Run a context
|
|
*
|
|
* ENTRY
|
|
* pctxt -> CTXT
|
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*
|
|
* EXIT-SUCCESS
|
|
* returns STATUS_SUCCESS
|
|
* EXIT-FAILURE
|
|
* returns AMLIERR_ code
|
|
*
|
|
* NOTE
|
|
* Caller must own the scheduler lock such that the context flags can
|
|
* be updated properly. The lock is dropped and re-obtain around
|
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* execution of the target context.
|
|
*/
|
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|
|
NTSTATUS LOCAL RunContext(PCTXT pctxt)
|
|
{
|
|
TRACENAME("RUNCONTEXT")
|
|
NTSTATUS rc;
|
|
PFRAMEHDR pfh;
|
|
PKTHREAD pkthSave = gReadyQueue.pkthCurrent;
|
|
PCTXT pctxtSave = gReadyQueue.pctxtCurrent;
|
|
|
|
ENTER(2, ("RunContext(pctxt=%x)\n", pctxt));
|
|
|
|
//
|
|
// Better be a Ready Context structure.
|
|
//
|
|
ASSERT(pctxt->dwSig == SIG_CTXT);
|
|
ASSERT(pctxt->dwfCtxt & CTXTF_READY);
|
|
|
|
//
|
|
// Remember previous context and thread.
|
|
//
|
|
gReadyQueue.pctxtCurrent = pctxt;
|
|
gReadyQueue.pkthCurrent = KeGetCurrentThread();
|
|
|
|
LOGSCHEDEVENT('RUNC', (ULONG_PTR)pctxt, (ULONG_PTR)
|
|
(pctxt->pnctxt? pctxt->pnctxt->pnsObj: pctxt->pnsObj),
|
|
(ULONG_PTR)pctxt->dwfCtxt);
|
|
|
|
//
|
|
// As long as the context is ready, execute it.
|
|
//
|
|
for (;;)
|
|
{
|
|
//
|
|
// Transistion context from Ready to Running.
|
|
//
|
|
rc = STATUS_SUCCESS;
|
|
pctxt->dwfCtxt &= ~CTXTF_READY;
|
|
pctxt->dwfCtxt |= CTXTF_RUNNING;
|
|
|
|
//
|
|
// Drop scheduler lock and execute context.
|
|
//
|
|
ReleaseMutex(&gReadyQueue.mutCtxtQ);
|
|
|
|
//
|
|
// Go for as long as there's work to perform.
|
|
//
|
|
while (!IsStackEmpty(pctxt))
|
|
{
|
|
CHKDEBUGGERREQ();
|
|
pfh = (PFRAMEHDR)pctxt->LocalHeap.pbHeapEnd;
|
|
ASSERT(pfh->pfnParse != NULL);
|
|
|
|
rc = pfh->pfnParse(pctxt, pfh, rc);
|
|
if ((rc == AMLISTA_PENDING) || (rc == AMLISTA_DONE))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Get the scheduler lock, and clear the running flag.
|
|
//
|
|
AcquireMutex(&gReadyQueue.mutCtxtQ);
|
|
|
|
//
|
|
// If we are in nested eval and the nested context is done,
|
|
// we must not clear the running flag because the parent thread
|
|
// is still running.
|
|
//
|
|
if (!(pctxt->dwfCtxt & CTXTF_NEST_EVAL) || (rc != AMLISTA_DONE))
|
|
{
|
|
pctxt->dwfCtxt &= ~CTXTF_RUNNING;
|
|
}
|
|
|
|
//
|
|
// If the context is no longer ready, we're done.
|
|
//
|
|
if (!(pctxt->dwfCtxt & CTXTF_READY))
|
|
{
|
|
break;
|
|
}
|
|
|
|
//
|
|
// Context became Ready during a pending operation, keep
|
|
// dispatching.
|
|
//
|
|
ASSERT (rc == AMLISTA_PENDING);
|
|
}
|
|
|
|
if (rc == AMLISTA_PENDING)
|
|
{
|
|
pctxt->dwfCtxt |= CTXTF_NEED_CALLBACK;
|
|
}
|
|
else if (rc == AMLISTA_DONE)
|
|
{
|
|
if (pctxt->pnctxt == NULL)
|
|
{
|
|
pctxt->dwfCtxt &= ~CTXTF_NEST_EVAL;
|
|
}
|
|
rc = STATUS_SUCCESS;
|
|
}
|
|
else
|
|
{
|
|
ReleaseMutex(&gReadyQueue.mutCtxtQ);
|
|
if ((rc == STATUS_SUCCESS) && (pctxt->pdataCallBack != NULL))
|
|
{
|
|
rc = DupObjData(gpheapGlobal, pctxt->pdataCallBack, &pctxt->Result);
|
|
}
|
|
|
|
if (pctxt->dwfCtxt & CTXTF_NEED_CALLBACK)
|
|
{
|
|
AsyncCallBack(pctxt, rc);
|
|
|
|
if(pctxt->dwfCtxt & CTXTF_ASYNC_EVAL)
|
|
{
|
|
rc = AMLISTA_PENDING;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Free any owned resources the context may not have freed.
|
|
//
|
|
while (pctxt->plistResources != NULL)
|
|
{
|
|
PRESOURCE pres;
|
|
|
|
pres = CONTAINING_RECORD(pctxt->plistResources, RESOURCE, list);
|
|
ASSERT (pres->pctxtOwner == pctxt);
|
|
|
|
//
|
|
// Note that it is the responsibility of the corresponding
|
|
// resource release functions (e.g. ReleaseASLMutex) to dequeue
|
|
// the resource from the list and free it.
|
|
//
|
|
switch (pres->dwResType)
|
|
{
|
|
case RESTYPE_MUTEX:
|
|
ReleaseASLMutex(pctxt, pres->pvResObj);
|
|
break;
|
|
|
|
default:
|
|
//
|
|
// We should never come here. In case we do, we need to
|
|
// dequeue the unknown resource object and free it.
|
|
//
|
|
pres = CONTAINING_RECORD(
|
|
ListRemoveHead(&pctxt->plistResources),
|
|
RESOURCE, list);
|
|
ASSERT(pres == NULL);
|
|
FREECROBJ(pres);
|
|
}
|
|
}
|
|
|
|
FreeContext(pctxt);
|
|
|
|
AcquireMutex(&gReadyQueue.mutCtxtQ);
|
|
}
|
|
|
|
//
|
|
// Restore previous context and thread.
|
|
//
|
|
gReadyQueue.pkthCurrent = pkthSave;
|
|
gReadyQueue.pctxtCurrent = pctxtSave;
|
|
|
|
if ((gReadyQueue.dwfCtxtQ & CQF_FLUSHING) && (gplistCtxtHead == NULL))
|
|
{
|
|
//
|
|
// We just flushed the last pending ctxt, let's go into paused state.
|
|
//
|
|
gReadyQueue.dwfCtxtQ &= ~CQF_FLUSHING;
|
|
gReadyQueue.dwfCtxtQ |= CQF_PAUSED;
|
|
if (gReadyQueue.pfnPauseCallback != NULL)
|
|
{
|
|
//
|
|
// We are in paused state and all pending contexts are flushed,
|
|
// tell core driver that we are done flushing.
|
|
//
|
|
gReadyQueue.pfnPauseCallback(gReadyQueue.PauseCBContext);
|
|
LOGSCHEDEVENT('PACB', (ULONG_PTR)pctxt, (ULONG_PTR)rc, 0);
|
|
}
|
|
}
|
|
|
|
LOGSCHEDEVENT('RUN!', (ULONG_PTR)pctxt, (ULONG_PTR)rc, 0);
|
|
|
|
EXIT(2, ("RunContext=%x\n", rc));
|
|
return rc;
|
|
} //RunContext
|