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