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/*++
Copyright (c) 1991-1994 Microsoft Corporation
Module Name:
jxreturn.c
Abstract:
This module implements the HAL return to firmware function.
--*/
/*
* S001 1995/12/01 T.Samezima
* add x86 bios logic
*
*/
#include "halp.h"
#define HEADER_FILE
#include "kxmips.h"
//
// Define keyboard registers structure.
//
typedef struct _KBD_REGISTERS {
union {
UCHAR Output;
UCHAR Input;
} Data;
UCHAR Pad0;
UCHAR Pad1;
UCHAR Pad2;
union {
UCHAR Status;
UCHAR Command;
} Control;
} KBD_REGISTERS;
#define KBD_IBF_MASK 2 // input buffer full mask
#define KbdGetStatus() (READ_REGISTER_UCHAR(&KbdBase->Control.Status))
#define KbdStoreCommand(Byte) WRITE_REGISTER_UCHAR(&KbdBase->Control.Command, Byte)
#define KbdStoreData(Byte) WRITE_REGISTER_UCHAR(&KbdBase->Data.Input, Byte)
#define KbdGetData() (READ_REGISTER_UCHAR(&KbdBase->Data.Output))
VOID
HalReturnToFirmware(
IN FIRMWARE_REENTRY Routine
)
/*++
Routine Description:
This function returns control to the specified firmware routine.
In most cases it generates a soft reset by asserting the reset line
trough the keyboard controller.
The Keyboard controller is mapped using the same virtual address
and the same fixed entry as the DMA.
Arguments:
Routine - Supplies a value indicating which firmware routine to invoke.
Return Value:
Does not return.
--*/
{
KIRQL OldIrql;
ULONG Eax,Ebx,Ecx,Edx,Esi,Edi,Ebp; //S001
volatile KBD_REGISTERS * KbdBase = (KBD_REGISTERS *)(KEYBOARD_PHYSICAL_BASE|KSEG1_BASE);
//
// Disable Interrupts.
//
KeRaiseIrql(HIGH_LEVEL, &OldIrql);
//
// Case on the type of return.
//
switch (Routine) {
case HalHaltRoutine:
//
// Hang looping.
//
for (;;) {
}
case HalPowerDownRoutine:
// S001 vvv
//
// Reset ISA Display Adapter to 80x25 color text mode.
//
Eax = 0x12; // AH = 0 AL = 0x12
HalCallBios(0x10, &Eax,&Ebx,&Ecx,&Edx,&Esi,&Edi,&Ebp);
// S001 ^^^
//
// Send Powerdown Command to the MRC.
//
for (;TRUE;) {
{
UCHAR Data;
Data = 0x1;
HalpLocalDeviceReadWrite(MRC_SWPOWEROFF, &Data, LOCALDEV_OP_WRITE);
}
}
case HalRestartRoutine:
case HalRebootRoutine:
case HalInteractiveModeRoutine:
#if 1
{
#if 0
DbgPrint("Hal return 0\n");
#endif
HalpMrcModeChange((UCHAR)MRC_OP_DUMP_AND_POWERSW_NMI);
#if 0
DbgPrint("Hal return 1\n");
#endif
}
#endif
// S001 vvv
//
// Reset ISA Display Adapter to 80x25 color text mode.
//
Eax = 0x12; // AH = 0 AL = 0x12
HalCallBios(0x10, &Eax,&Ebx,&Ecx,&Edx,&Esi,&Edi,&Ebp);
// S001 ^^^
//
// Reset ISA Display Adapter to 80x25 color text mode.
//
HalpResetX86DisplayAdapter();
//
// Send WriteOutputBuffer Command to the controller.
//
while ((KbdGetStatus() & KBD_IBF_MASK) != 0) {
}
KbdStoreCommand(0xD1);
//
// Write a zero to the output buffer. Causes reset line to be asserted.
//
while ((KbdGetStatus() & KBD_IBF_MASK) != 0) {
}
KbdStoreData(0);
for (;;) {
}
default:
KdPrint(("HalReturnToFirmware invalid argument\n"));
KeLowerIrql(OldIrql);
DbgBreakPoint();
}
}
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