186 lines
2.9 KiB
C
186 lines
2.9 KiB
C
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/*++
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Copyright (c) 1995,1996 Microsoft Corporation
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:ts=4
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Module Name:
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log.c
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Abstract:
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Debug log Code for serial.
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Environment:
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kernel mode only
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Notes:
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Revision History:
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10-08-95 : created
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--*/
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#include "pch.h"
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#include <stdio.h>
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#if DBG
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KSPIN_LOCK LogSpinLock;
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struct SERENUM_LOG_ENTRY {
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ULONG le_sig; // Identifying string
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ULONG_PTR le_info1; // entry specific info
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ULONG_PTR le_info2; // entry specific info
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ULONG_PTR le_info3; // entry specific info
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}; // SERENUM_LOG_ENTRY
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struct SERENUM_LOG_ENTRY *SerenumLStart = 0; // No log yet
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struct SERENUM_LOG_ENTRY *SerenumLPtr;
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struct SERENUM_LOG_ENTRY *SerenumLEnd;
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ULONG LogMask = 0xffffffff;
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VOID
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SerenumDebugLogEntry(IN ULONG Mask, IN ULONG Sig, IN ULONG_PTR Info1,
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IN ULONG_PTR Info2, IN ULONG_PTR Info3)
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/*++
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Routine Description:
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Adds an Entry to serial log.
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Arguments:
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Return Value:
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None.
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--*/
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{
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KIRQL irql;
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typedef union _SIG {
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struct {
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UCHAR Byte0;
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UCHAR Byte1;
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UCHAR Byte2;
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UCHAR Byte3;
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} b;
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ULONG l;
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} SIG, *PSIG;
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SIG sig, rsig;
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if (SerenumLStart == 0) {
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return;
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}
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if ((Mask & LogMask) == 0) {
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return;
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}
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irql = KeGetCurrentIrql();
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if (irql < DISPATCH_LEVEL) {
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KeAcquireSpinLock(&LogSpinLock, &irql);
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} else {
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KeAcquireSpinLockAtDpcLevel(&LogSpinLock);
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}
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if (SerenumLPtr > SerenumLStart) {
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SerenumLPtr -= 1; // Decrement to next entry
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} else {
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SerenumLPtr = SerenumLEnd;
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}
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sig.l = Sig;
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rsig.b.Byte0 = sig.b.Byte3;
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rsig.b.Byte1 = sig.b.Byte2;
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rsig.b.Byte2 = sig.b.Byte1;
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rsig.b.Byte3 = sig.b.Byte0;
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SerenumLPtr->le_sig = rsig.l;
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SerenumLPtr->le_info1 = Info1;
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SerenumLPtr->le_info2 = Info2;
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SerenumLPtr->le_info3 = Info3;
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ASSERT(SerenumLPtr >= SerenumLStart);
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if (irql < DISPATCH_LEVEL) {
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KeReleaseSpinLock(&LogSpinLock, irql);
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} else {
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KeReleaseSpinLockFromDpcLevel(&LogSpinLock);
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}
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return;
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}
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VOID
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SerenumLogInit()
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/*++
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Routine Description:
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Init the debug log - remember interesting information in a circular buffer
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Arguments:
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Return Value:
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None.
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--*/
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{
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#ifdef MAX_DEBUG
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ULONG logSize = 4096*6;
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#else
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ULONG logSize = 4096*3;
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#endif
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KeInitializeSpinLock(&LogSpinLock);
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SerenumLStart = ExAllocatePoolWithTag(NonPagedPool, logSize, 'mneS');
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if (SerenumLStart) {
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SerenumLPtr = SerenumLStart;
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// Point the end (and first entry) 1 entry from the end of the segment
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SerenumLEnd = SerenumLStart + (logSize
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/ sizeof(struct SERENUM_LOG_ENTRY))
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- 1;
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}
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return;
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}
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VOID
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SerenumLogFree(
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)
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/*++
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Routine Description:
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Arguments:
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Return Value:
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None.
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--*/
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{
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if (SerenumLStart) {
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ExFreePool(SerenumLStart);
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}
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return;
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}
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#endif // DBG
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