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Diffstat (limited to 'board/MAI/bios_emulator/scitech/src/pm/vxd/_pm.asm')
| -rw-r--r-- | board/MAI/bios_emulator/scitech/src/pm/vxd/_pm.asm | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/board/MAI/bios_emulator/scitech/src/pm/vxd/_pm.asm b/board/MAI/bios_emulator/scitech/src/pm/vxd/_pm.asm new file mode 100644 index 0000000000..64a7cecb2d --- /dev/null +++ b/board/MAI/bios_emulator/scitech/src/pm/vxd/_pm.asm @@ -0,0 +1,299 @@ +;**************************************************************************** +;* +;* 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 VxD +;* +;* Description: Low level assembly support for the PM library specific to +;* Windows VxDs. +;* +;**************************************************************************** + + IDEAL + +include "scitech.mac" ; Memory model macros + +header _pm ; Set up memory model + +begdataseg _pm + + cextern _PM_savedDS,USHORT + +enddataseg _pm + +P586 + +begcodeseg _pm ; Start of code segment + +;---------------------------------------------------------------------------- +; void PM_segread(PMSREGS *sregs) +;---------------------------------------------------------------------------- +; Read the current value of all segment registers +;---------------------------------------------------------------------------- +cprocstart PM_segread + + ARG sregs:DPTR + + enter_c + + mov ax,es + _les _si,[sregs] + mov [_ES _si],ax + mov [_ES _si+2],cs + mov [_ES _si+4],ss + mov [_ES _si+6],ds + mov [_ES _si+8],fs + mov [_ES _si+10],gs + + leave_c + ret + +cprocend + +;---------------------------------------------------------------------------- +; int PM_int386x(int intno, PMREGS *in, PMREGS *out,PMSREGS *sregs) +;---------------------------------------------------------------------------- +; Issues a software interrupt in protected mode. This routine has been +; written to allow user programs to load CS and DS with different values +; other than the default. +;---------------------------------------------------------------------------- +cprocstart PM_int386x + +; Not used for VxDs + + ret + +cprocend + +;---------------------------------------------------------------------------- +; void PM_saveDS(void) +;---------------------------------------------------------------------------- +; Save the value of DS into a section of the code segment, so that we can +; quickly load this value at a later date in the PM_loadDS() routine from +; inside interrupt handlers etc. The method to do this is different +; depending on the DOS extender being used. +;---------------------------------------------------------------------------- +cprocstart PM_saveDS + + mov [_PM_savedDS],ds ; Store away in data segment + ret + +cprocend + +;---------------------------------------------------------------------------- +; void PM_loadDS(void) +;---------------------------------------------------------------------------- +; Routine to load the DS register with the default value for the current +; DOS extender. Only the DS register is loaded, not the ES register, so +; if you wish to call C code, you will need to also load the ES register +; in 32 bit protected mode. +;---------------------------------------------------------------------------- +cprocstart PM_loadDS + + mov ds,[cs:_PM_savedDS] ; We can access the proper DS through CS + ret + +cprocend + +;---------------------------------------------------------------------------- +; void PM_setBankA(int bank) +;---------------------------------------------------------------------------- +cprocstart PM_setBankA + +; Not used for VxDs + + ret + +cprocend + +;---------------------------------------------------------------------------- +; void PM_setBankAB(int bank) +;---------------------------------------------------------------------------- +cprocstart PM_setBankAB + +; Not used for VxDs + + ret + +cprocend + +;---------------------------------------------------------------------------- +; void PM_setCRTStart(int x,int y,int waitVRT) +;---------------------------------------------------------------------------- +cprocstart PM_setCRTStart + +; Not used for VxDs + + ret + +cprocend + +; 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 + +;---------------------------------------------------------------------------- +; uchar _PM_readCMOS(int index) +;---------------------------------------------------------------------------- +; Read the value of a specific CMOS register. We do this with both +; normal interrupts and NMI disabled. +;---------------------------------------------------------------------------- +cprocstart _PM_readCMOS + + ARG index:UINT + + push _bp + mov _bp,_sp + pushfd + mov al,[BYTE index] + or al,80h ; Add disable NMI flag + cli + out 70h,al + IODELAYN 5 + in al,71h + mov ah,al + xor al,al + IODELAYN 5 + out 70h,al ; Re-enable NMI + mov al,ah ; Return value in AL + popfd + pop _bp + ret + +cprocend + +;---------------------------------------------------------------------------- +; void _PM_writeCMOS(int index,uchar value) +;---------------------------------------------------------------------------- +; Read the value of a specific CMOS register. We do this with both +; normal interrupts and NMI disabled. +;---------------------------------------------------------------------------- +cprocstart _PM_writeCMOS + + ARG index:UINT, value:UCHAR + + push _bp + mov _bp,_sp + pushfd + mov al,[BYTE index] + or al,80h ; Add disable NMI flag + cli + out 70h,al + IODELAYN 5 + mov al,[value] + out 71h,al + xor al,al + IODELAYN 5 + out 70h,al ; Re-enable NMI + popfd + pop _bp + ret + +cprocend + +;---------------------------------------------------------------------------- +; double _ftol(double f) +;---------------------------------------------------------------------------- +; Calls to __ftol are generated by the Borland C++ compiler for code +; that needs to convert a floating point type to an integral type. +; +; Input: floating point number on the top of the '87. +; +; Output: a (signed or unsigned) long in EAX +; All other registers preserved. +;----------------------------------------------------------------------- +cprocstart _ftol + + LOCAL temp1:WORD, temp2:QWORD = LocalSize + + push ebp + mov ebp,esp + sub esp,LocalSize + + fstcw [temp1] ; save the control word + fwait + mov al,[BYTE temp1+1] + or [BYTE temp1+1],0Ch ; set rounding control to chop + fldcw [temp1] + fistp [temp2] ; convert to 64-bit integer + mov [BYTE temp1+1],al + fldcw [temp1] ; restore the control word + mov eax,[DWORD temp2] ; return LS 32 bits + mov edx,[DWORD temp2+4] ; MS 32 bits + + mov esp,ebp + pop ebp + ret + +cprocend + +;---------------------------------------------------------------------------- +; _PM_getPDB - Return the Page Table Directory Base address +;---------------------------------------------------------------------------- +cprocstart _PM_getPDB + + mov eax,cr3 + and eax,0FFFFF000h + ret + +cprocend + +;---------------------------------------------------------------------------- +; Flush the Translation Lookaside buffer +;---------------------------------------------------------------------------- +cprocstart PM_flushTLB + + wbinvd ; Flush the CPU cache + mov eax,cr3 + mov cr3,eax ; Flush the TLB + ret + +cprocend + +endcodeseg _pm + + END ; End of module |
