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/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
ixnmi.c
Abstract:
Provides standard x86 NMI handler
Author:
kenr
Revision History:
--*/
#include "halp.h"
#include "bugcodes.h"
#define SYSTEM_CONTROL_PORT_A 0x92
#define SYSTEM_CONTROL_PORT_B 0x61
#define EISA_EXTENDED_NMI_STATUS 0x461
UCHAR EisaNMIMsg[] = MSG_NMI_EISA_IOCHKERR;
VOID
HalHandleNMI(
IN OUT PVOID NmiInfo
)
/*++
Routine Description:
Called DURING an NMI. The system will BugCheck when an NMI occurs.
This function can return the proper bugcheck code, bugcheck itself,
or return success which will cause the system to iret from the nmi.
This function is called during an NMI - no system services are available.
In addition, you don't want to touch any spinlock which is normally
used since we may have been interrupted while owning it, etc, etc...
Warnings:
Do NOT:
Make any system calls
Attempt to acquire any spinlock used by any code outside the NMI handler
Change the interrupt state. Do not execute any IRET inside this code
Passing data to non-NMI code must be done using manual interlocked
functions. (xchg instructions).
Arguments:
NmiInfo - Pointer to NMI information structure (TBD)
- NULL means no NMI information structure was passed
Return Value:
BugCheck code
--*/
{
UCHAR StatusByte;
UCHAR EisaPort;
UCHAR c;
ULONG port, i;
HalDisplayString (MSG_HARDWARE_ERROR1);
HalDisplayString (MSG_HARDWARE_ERROR2);
StatusByte = READ_PORT_UCHAR((PUCHAR) SYSTEM_CONTROL_PORT_B);
if (StatusByte & 0x80) {
HalDisplayString (MSG_NMI_PARITY);
}
if (StatusByte & 0x40) {
HalDisplayString (MSG_NMI_CHANNEL_CHECK);
}
if (HalpBusType == MACHINE_TYPE_EISA) {
//
// This is an Eisa machine, check for extnded nmi information...
//
StatusByte = READ_PORT_UCHAR((PUCHAR) EISA_EXTENDED_NMI_STATUS);
if (StatusByte & 0x80) {
HalDisplayString (MSG_NMI_FAIL_SAFE);
}
if (StatusByte & 0x40) {
HalDisplayString (MSG_NMI_BUS_TIMEOUT);
}
if (StatusByte & 0x20) {
HalDisplayString (MSG_NMI_SOFTWARE_NMI);
}
//
// Look for any Eisa expansion board. See if it asserted NMI.
//
for (EisaPort = 1; EisaPort <= 0xf; EisaPort++) {
port = (EisaPort << 12) + 0xC80;
WRITE_PORT_UCHAR ((PUCHAR) port, 0xff);
StatusByte = READ_PORT_UCHAR ((PUCHAR) port);
if ((StatusByte & 0x80) == 0) {
//
// Found valid Eisa board, Check to see if it's
// if IOCHKERR is asserted.
//
StatusByte = READ_PORT_UCHAR ((PUCHAR) port+4);
if (StatusByte & 0x2 && StatusByte != 0xff) {
c = (EisaPort > 9 ? 'A'-10 : '0') + EisaPort;
for (i=0; EisaNMIMsg[i]; i++) {
if (EisaNMIMsg[i] == '%') {
EisaNMIMsg[i] = c;
HalDisplayString (EisaNMIMsg);
EisaNMIMsg[i] = '%';
break;
}
}
}
}
}
}
HalDisplayString (MSG_HALT);
KeEnterKernelDebugger();
}
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