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// #pragma comment(exestr, "@(#) jxreturn.c 1.1 95/09/28 15:40:17 nec")
/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
jxreturn.c
Abstract:
This module implements the HAL return to firmware function.
Author:
David N. Cutler (davec) 21-Aug-1991
Revision History:
H000 Tue Apr 25 16:02:05 1995 kbnes!kisimoto
-add Powerdown if argument value indicates
HalPowerDownRoutine
S001 kuriyama@oa2.kb.nec.co.jp Sun May 21 18:32:55 JST 1995
-compile error clear
S002 kuriyama@oa2.kb.nec.co.jp Sun May 21 20:19:48 JST 1995
- powoff bug? fixed
H003 Sat Aug 12 19:33:45 1995 kbnes!kisimoto
- Removed _J94C_ definitions.
_J94C_ definition indicates that the status of the
dump switch can acknowledge from Self-test register.
M004 kuriyama@oa2.kb.nec.co.jp Wed Aug 23 19:28:35 JST 1995
- add for x86bios emurator support
--*/
#include "halp.h"
#define HEADER_FILE
#include "kxmips.h"
//
// Define keyboard registers structure.
//
typedef struct _KBD_REGISTERS {
union {
UCHAR Output;
UCHAR Input;
} Data;
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;
ENTRYLO Pte[2];
ULONG Index; // A001
volatile KBD_REGISTERS * KbdBase = (KBD_REGISTERS *)DMA_VIRTUAL_BASE;
ULONG Eax,Ebx,Ecx,Edx,Esi,Edi,Ebp; //S004
//
// Disable Interrupts.
//
KeRaiseIrql(HIGH_LEVEL, &OldIrql);
//
// Case on the type of return.
//
switch (Routine) {
case HalHaltRoutine:
//
// Hang looping.
//
for (;;) {
}
case HalPowerDownRoutine:
#if defined (_MRCPOWER_)
//
// S004
// Reset ISA Display Adapter to 80x25 color text mode.
//
Eax = 0x12; // AH = 0 AL = 0x12
HalCallBios(0x10, &Eax,&Ebx,&Ecx,&Edx,&Esi,&Edi,&Ebp);
//
// H000,S001
// Powerdown the machine
//
//
// Map the MRC
//
Pte[0].PFN = MRC_TEMP_PHYSICAL_BASE >> PAGE_SHIFT;
Pte[0].G = 1;
Pte[0].V = 1;
Pte[0].D = 1;
#if defined(R3000)
Pte[0].N = 1;
#endif
#if defined(R4000)
//
// set second page to global and not valid.
//
Pte[0].C = UNCACHED_POLICY;
Pte[1].G = 1;
Pte[1].V = 0;
#endif
//
// Map MRC using virtual address of DMA controller.
//
KeFillFixedEntryTb((PHARDWARE_PTE)&Pte[0],
(PVOID)DMA_VIRTUAL_BASE,
DMA_ENTRY);
//
// Send Powerdown Command to the MRC.
//
for (;;) { // S002
WRITE_REGISTER_UCHAR(
&MRC_CONTROL->SoftwarePowerOff,
0x1
);
}
for (;;) {
}
#endif //_MRCPOWER_
case HalRestartRoutine:
case HalRebootRoutine:
case HalInteractiveModeRoutine:
//
// S004
// Reset ISA Display Adapter to 80x25 color text mode.
//
Eax = 0x12; // AH = 0 AL = 0x12
HalCallBios(0x10, &Eax,&Ebx,&Ecx,&Edx,&Esi,&Edi,&Ebp);
//
// Map the keyboard controller
//
Pte[0].PFN = KEYBOARD_PHYSICAL_BASE >> PAGE_SHIFT;
Pte[0].G = 1;
Pte[0].V = 1;
Pte[0].D = 1;
#if defined(R3000)
Pte[0].N = 1;
#endif
#if defined(R4000)
//
// set second page to global and not valid.
//
Pte[0].C = UNCACHED_POLICY;
Pte[1].G = 1;
Pte[1].V = 0;
#endif
//
// Map keyboard controller using virtual address of DMA controller.
//
KeFillFixedEntryTb((PHARDWARE_PTE)&Pte[0],
(PVOID)DMA_VIRTUAL_BASE,
DMA_ENTRY);
//
// 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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