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Diffstat (limited to 'board/MAI/bios_emulator/scitech/src/pm/ntdrv/_irq.asm')
| -rw-r--r-- | board/MAI/bios_emulator/scitech/src/pm/ntdrv/_irq.asm | 288 |
1 files changed, 0 insertions, 288 deletions
diff --git a/board/MAI/bios_emulator/scitech/src/pm/ntdrv/_irq.asm b/board/MAI/bios_emulator/scitech/src/pm/ntdrv/_irq.asm deleted file mode 100644 index 11824a0afc..0000000000 --- a/board/MAI/bios_emulator/scitech/src/pm/ntdrv/_irq.asm +++ /dev/null @@ -1,288 +0,0 @@ -;**************************************************************************** -;* -;* SciTech OS Portability Manager Library -;* -;* ======================================================================== -;* -;* The contents of this file are subject to the SciTech MGL Public -;* License Version 1.0 (the "License"); you may not use this file -;* except in compliance with the License. You may obtain a copy of -;* the License at http://www.scitechsoft.com/mgl-license.txt -;* -;* Software distributed under the License is distributed on an -;* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or -;* implied. See the License for the specific language governing -;* rights and limitations under the License. -;* -;* The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc. -;* -;* The Initial Developer of the Original Code is SciTech Software, Inc. -;* All Rights Reserved. -;* -;* ======================================================================== -;* -;* Language: 80386 Assembler, TASM 4.0 or NASM -;* Environment: 32-bit Windows NT device driver -;* -;* Description: Low level assembly support for the PM library specific to -;* Windows NT device drivers. -;* -;**************************************************************************** - - IDEAL - -include "scitech.mac" ; Memory model macros - -header _irq ; Set up memory model - -begdataseg _irq - - cextern _PM_rtcHandler,CPTR - cextern _PM_prevRTC,FCPTR - -RtcInside dw 0 ; Are we still handling current interrupt -sidtBuf df 0 ; Buffer for sidt instruction - -enddataseg _irq - -begcodeseg _irq ; Start of code segment - -cpublic _PM_irqCodeStart - -; Macro to delay briefly to ensure that enough time has elapsed between -; successive I/O accesses so that the device being accessed can respond -; to both accesses even on a very fast PC. - -ifdef USE_NASM -%macro DELAY 0 - jmp short $+2 - jmp short $+2 - jmp short $+2 -%endmacro -%macro IODELAYN 1 -%rep %1 - DELAY -%endrep -%endmacro -else -macro DELAY - jmp short $+2 - jmp short $+2 - jmp short $+2 -endm -macro IODELAYN N - rept N - DELAY - endm -endm -endif - -;---------------------------------------------------------------------------- -; PM_rtcISR - Real time clock interrupt subroutine dispatcher -;---------------------------------------------------------------------------- -; Hardware interrupt handler for the timer interrupt, to dispatch control -; to high level C based subroutines. We save the state of all registers -; in this routine, and switch to a local stack. Interrupts are *off* -; when we call the user code. -; -; NOTE: This routine switches to a local stack before calling any C code, -; and hence is _not_ re-entrant. Make sure your C code executes as -; quickly as possible, since a timer overrun will simply hang the -; system. -;---------------------------------------------------------------------------- -cprocfar _PM_rtcISR - -;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -; If we enable interrupts and call into any C based interrupt handling code, -; we need to setup a bunch of important information for the NT kernel. The -; code below takes care of this housekeeping for us (see Undocumented NT for -; details). If we don't do this housekeeping and interrupts are enabled, -; the kernel will become very unstable and crash within 10 seconds or so. -;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ - - pushad - pushfd - push fs - - mov ebx,00000030h - mov fs,bx - sub esp,50h - mov ebp,esp - -; Setup the exception frame to NULL - - mov ebx,[DWORD cs:0FFDFF000h] - mov [DWORD ds:0FFDFF000h], 0FFFFFFFFh - mov [DWORD ebp],ebx - -; Save away the existing KSS ebp - - mov esi,[DWORD cs:0FFDFF124h] - mov ebx,[DWORD esi+00000128h] - mov [DWORD ebp+4h],ebx - mov [DWORD esi+00000128h],ebp - -; Save away the kernel time and the thread mode (kernel/user) - - mov edi,[DWORD esi+00000137h] - mov [DWORD ebp+8h],edi - -; Set the thread mode (kernel/user) based on the code selector - - mov ebx,[DWORD ebp+7Ch] - and ebx,01 - mov [BYTE esi+00000137h],bl - -;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -; End of special interrupt Prolog code -;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ - -; Clear priority interrupt controller and re-enable interrupts so we -; dont lock things up for long. - - mov al,20h - out 0A0h,al - out 020h,al - -; Clear real-time clock timeout - - in al,70h ; Read CMOS index register - push eax ; and save for later - IODELAYN 3 - mov al,0Ch - out 70h,al - IODELAYN 5 - in al,71h - -; Call the C interrupt handler function - - cmp [BYTE RtcInside],1 ; Check for mutual exclusion - je @@Exit - mov [BYTE RtcInside],1 - sti ; Enable interrupts - cld ; Clear direction flag for C code - call [CPTR _PM_rtcHandler] - cli ; Disable interrupts on exit! - mov [BYTE RtcInside],0 - -@@Exit: pop eax - out 70h,al ; Restore CMOS index register - -;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -; Start of special epilog code to restore stuff on exit from handler -;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ - -; Restore the KSS ebp - - mov esi,[DWORD cs:0FFDFF124h] - mov ebx,[DWORD ebp+4] - mov [DWORD esi+00000128h],ebx - -; Restore the exception frame - - mov ebx,[DWORD ebp] - mov [DWORD fs:00000000],ebx - -; Restore the thread mode - - mov ebx,[DWORD ebp+8h] - mov esi,[DWORD fs:00000124h] - mov [BYTE esi+00000137h],bl - add esp, 50h - pop fs - popfd - popad - -; Return from interrupt - - iret - -cprocend - -cpublic _PM_irqCodeEnd - -;---------------------------------------------------------------------------- -; void _PM_getISR(int irq,PMFARPTR *handler); -;---------------------------------------------------------------------------- -; Function to return the specific IRQ handler direct from the IDT. -;---------------------------------------------------------------------------- -cprocstart _PM_getISR - - ARG idtEntry:UINT, handler:DPTR - - enter_c 0 - mov ecx,[handler] ; Get address of handler to fill in - sidt [sidtBuf] ; Get IDTR register into sidtBuf - mov eax,[DWORD sidtBuf+2] ; Get address of IDT into EAX - mov ebx,[idtEntry] - lea eax,[eax+ebx*8] ; Get entry in the IDT - movzx edx,[WORD eax+6] ; Get high order 16-bits - shl edx,16 ; Move into top 16-bits of address - mov dx,[WORD eax] ; Get low order 16-bits - mov [DWORD ecx],edx ; Store linear address of handler - mov dx,[WORD eax+2] ; Get selector value - mov [WORD ecx+4],dx ; Store selector value - leave_c - ret - -cprocend _PM_getISR - -;---------------------------------------------------------------------------- -; void _PM_setISR(int irq,void *handler); -;---------------------------------------------------------------------------- -; Function to set the specific IRQ handler direct in the IDT. -;---------------------------------------------------------------------------- -cprocstart _PM_setISR - - ARG irq:UINT, handler:CPTR - - enter_c 0 - mov ecx,[handler] ; Get address of new handler - mov dx,cs ; Get selector for new handler - sidt [sidtBuf] ; Get IDTR register into sidtBuf - mov eax,[DWORD sidtBuf+2] ; Get address of IDT into EAX - mov ebx,[idtEntry] - lea eax,[eax+ebx*8] ; Get entry in the IDT - cli - mov [WORD eax+2],dx ; Store code segment selector - mov [WORD eax],cx ; Store low order bits of handler - shr ecx,16 - mov [WORD eax+6],cx ; Store high order bits of handler - sti - leave_c - ret - -cprocend _PM_setISR - -;---------------------------------------------------------------------------- -; void _PM_restoreISR(int irq,PMFARPTR *handler); -;---------------------------------------------------------------------------- -; Function to set the specific IRQ handler direct in the IDT. -;---------------------------------------------------------------------------- -cprocstart _PM_restoreISR - - ARG irq:UINT, handler:CPTR - - enter_c 0 - mov ecx,[handler] - mov dx,[WORD ecx+4] ; Get selector for old handler - mov ecx,[DWORD ecx] ; Get address of old handler - sidt [sidtBuf] ; Get IDTR register into sidtBuf - mov eax,[DWORD sidtBuf+2] ; Get address of IDT into EAX - mov ebx,[idtEntry] - lea eax,[eax+ebx*8] ; Get entry in the IDT - cli - mov [WORD eax+2],dx ; Store code segment selector - mov [WORD eax],cx ; Store low order bits of handler - shr ecx,16 - mov [WORD eax+6],cx ; Store high order bits of handler - sti - leave_c - ret - -cprocend _PM_restoreISR - -endcodeseg _irq - - END ; End of module - |