443 lines
12 KiB
NASM
443 lines
12 KiB
NASM
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;
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;
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; Copyright (C) Microsoft Corporation, 1987-90
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;
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; This Module contains Proprietary Information of Microsoft
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; Corporation and should be treated as Confidential.
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;
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title emoem.asm - OEM dependent code for 80x87
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;--------------------------------------------------------------------
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;
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; OEM customization routines for 8087/80287/80387 coprocessor
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;
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; This module is designed to work with the following
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; Microsoft language releases:
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;
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; Microsoft C 3.00 and later
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; Microsoft FORTRAN 77 3.30 and later
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; Microsoft Pascal 3.30 and later
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;
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; This module supersedes the OEMR7.ASM module used in earlier
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; versions of Microsoft FORTRAN 77 and Pascal. The documentation
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; provided with the FORTRAN and Pascal releases refers to the old
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; OEMR7.ASM module and is only slightly relevant to this module.
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;
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; The following routines need to be written to properly handle the
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; 8087/808287/80387 installation, termination, and interrupt handler
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;
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; __FPINSTALL87 install 80x87 interrupt handler
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; __FPTERMINATE87 deinstall 80x87 interrupt handler
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; __fpintreset reset OEM hardware if an 80x87 interrupt
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;
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; ***** NEW INSTRUCTIONS *****
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;
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; If you want a PC clone version, do nothing. The libraries are
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; setup for working on IBM PC's and clones.
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;
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; These instructions only need to be followed if a non-IBM PC
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; clone version is desired.
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;
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; This module should be assembled with the
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; Microsoft Macro Assembler Version 4.00 or later as follows:
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;
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; masm -DOEM -r emoem.asm;
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;
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; Most hardware handles the 8087/80287/80387 in one of the following
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; three ways -
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;
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; 1. NMI - IBM PC and clones all handle the interrupt this way
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; 2. single 8259
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; 3. master/slave 8259
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;
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; Manufacturer specific initialization is supported for these 3
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; machine configurations either by modifying this file and replacing
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; the existing EMOEM module in the math libraries or by patching
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; the .LIB and .EXE files directly.
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;
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; LIB 87-+EMOEM;
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; LIB EM-+EMOEM;
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;
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;--------------------------------------------------------------------
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ifdef OEM
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if1
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%out OEM version for non-clone support
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endif
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endif
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;---------------------------------------------------------------------
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; Assembly constants.
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;---------------------------------------------------------------------
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; MS-DOS OS calls
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OPSYS EQU 21H
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SETVECOP EQU 25H
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GETVECOP EQU 35H
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DOSVERSION EQU 30h
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CTLCVEC EQU 23h
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EMULATOR_DATA segment para public 'FAR_DATA'
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assume ds:EMULATOR_DATA
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; User may place data here if DS is setup properly.
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; Recommend keeping the data items in the code segment.
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EMULATOR_DATA ends
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EMULATOR_TEXT segment para public 'CODE'
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assume cs:EMULATOR_TEXT
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public __FPINSTALL87 ; DO NOT CHANGE THE CASE ON
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public __FPTERMINATE87 ; THESE PUBLIC DEFINITIONS
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extrn __FPEXCEPTION87:near ; DO NOT CHANGE CASE
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ifdef OEM
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;***********************************************************************
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;
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; Hardware dependent parameters in the 80x87 exception handler.
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;
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; For machines using 2 8259's to handle the 80x87 exception, be sure that
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; the slave 8259 is the 1st below and the master is the 2nd.
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;
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; The last 4 fields allow you to enable extra interrupt lines into the
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; 8259s. It should only be necessary to use these fields if the 80x87
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; interrupt is being masked out by the 8259 PIC.
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;
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; The ocw2's (EOI commands) can be either non-specific (20H) or
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; specific (6xH where x=0 to 7). If you do not know which interrupt
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; request line on the 8259 the 80x87 exception uses, then you should issue
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; the non-specific EOI (20H). Interrupts are off at this point in the
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; interrupt handler so a higher priority interrupt will not be seen.
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oeminfo struc
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oemnum db 0 ; MS-DOS OEM number (IBM is 00h)
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intnum db 2 ; IBM PC clone interrupt number
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share db 0 ; nonzero if original vector should be taken
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a8259 dw 0 ; 1st 8259 (A0=0) port #
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aocw2 db 0 ; 1st 8259 (A0=0) EOI command
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b8259 dw 0 ; 2nd 8259 (A0=0) port #
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bocw2 db 0 ; 2nd 8259 (A0=0) EOI command
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a8259m dw 0 ; 1st 8259 (A0=1) port #
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aocw1m db 0 ; 1st 8259 (A0=1) value to mask against IMR
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b8259m dw 0 ; 2nd 8259 (A0=1) port #
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bocw1m db 0 ; 2nd 8259 (A0=1) value to mask against IMR
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oeminfo ends
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;-----------------------------------------------------------------------
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; OEM specific 80x87 information
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;
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; If the OEM number returned from the DOS version call matches,
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; this information is automatically moved into the oem struc below.
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oemtab label byte ; Table of OEM specific values for 80x87
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; OEM#, int, shr, a59, acw2,b59, bcw2,a59m,acw1,b59m,bcw1
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;TI Professional Computer
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TI_prof oeminfo <028h,047h,000h,018h,020h,0000,0000,0000,0000,0000,0000>
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db 0 ; end of table
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; Unique pattern that can be searched for with the debugger so that
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; .LIB or .EXE files can be patched with the correct values.
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; If new values are patched into .LIB or .EXE files, care must be
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; taken in insure the values are correct. In particular, words and
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; bytes are intermixed in oeminfo structure. Remember words are
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; stored low byte - high byte in memory on the 8086 family.
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db '<<8087>>' ; older versions used '<8087>'
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; Some manufacturer's machines can not be differentiated by the
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; OEM number returned by the MS-DOS version check system call.
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; For these machines it is necessary to replace the line below
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oem1 oeminfo <> ; default values for IBM PC & clones
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; with one of the following. If your machine has an 80x87 capability
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; and it is not in the list below, you should contact your hardware
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; manufacturer for the necessary information.
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;ACT Apricot
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;oem1 oeminfo <000h,055h,000h,000h,020h,000h,000h,000h,000h,000h,000h>
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;NEC APC3 and PC-9801 (OEM number returned by NEC MS-DOS's is different)
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;oem1 oeminfo <000h,016h,000h,008h,066h,000h,067h,00Ah,0BFh,002h,07Fh>
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;---------------------------------------------------------------------
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aoldIMR db 0 ; 1st 8259 original IMR value
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boldIMR db 0 ; 2nd 8259 original IMR value
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endif ;OEM
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statwd dw 0 ; Temporary for status word
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oldvec dd 0 ; Old value in 80x87 exception interrupt vector
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ctlc dd 0 ; Old value of Control-C vector (INT 23h)
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page
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;---------------------------------------------------------------------
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;
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; Perform OEM specific initialization of the 80x87.
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;
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__FPINSTALL87:
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push ds ; DS = EMULATOR_DATA
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push cs ; Move current CS to DS for opsys calls.
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pop ds
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assume ds:EMULATOR_TEXT
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ifdef OEM
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push ds
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pop es ; CS = DS = ES
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mov ah,DOSVERSION
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int OPSYS ; bh = OEM#
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cld
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mov si,offset oemtab ; start of OEM 80x87 info table
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mov di,offset oem1+1
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mov cx,(size oem1)-1
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OEMloop:
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lodsb ; get OEM#
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or al,al
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jz OEMdone ; OEM# = 0 - did not find OEM
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cmp al,bh ; correct OEM#
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je OEMfound
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add si,cx ; skip over OEM information
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jmp OEMloop
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OEMfound:
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rep movsb ; move the information
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OEMdone: ; done with automatic customization
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endif ;OEM
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; Save old interrupt vector.
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; Ask operating system for vector.
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ifdef OEM
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mov al,[oem1].intnum ; Interrupt vector number.
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mov ah,GETVECOP ; Operating system call interrupt.
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else
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mov ax,GETVECOP shl 8 + 2 ; get interrupt vector 2
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endif ;OEM
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int OPSYS ; Call operating system.
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mov word ptr [oldvec],bx ; Squirrel away old vector.
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mov word ptr [oldvec+2],es
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; Have operating system install interrupt vectors.
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SetVector:
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mov dx,offset __fpinterrupt87 ; Load DX with 80x87 interrupt handler.
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ifdef OEM
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mov ah,SETVECOP ; Set interrupt vector code in AH.
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mov al,[oem1].intnum ; Set vector number.
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else
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mov ax,SETVECOP shl 8 + 2 ; set interrupt vector 2
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endif ;OEM
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int OPSYS ; Install vector.
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; Intercept Control-C vector to guarentee cleanup
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mov ax,GETVECOP shl 8 + CTLCVEC
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int OPSYS
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mov word ptr [ctlc],bx
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mov word ptr [ctlc+2],es
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mov dx,offset ctlcexit
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mov ax,SETVECOP shl 8 + CTLCVEC
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int OPSYS
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ifdef OEM
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; set up 8259's so that 80x87 interrupts are enabled
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mov ah,[oem1].aocw1m ; get mask for 1st 8259 IMR
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or ah,ah ; if 0, don't need to do this
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jz installdone ; and only 1 8259
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mov dx,[oem1].a8259m ; get port number for 1st 8259 (A0=1)
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in al,dx ; read old IMR value
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mov [aoldIMR],al ; save it to restore at termination
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and al,ah ; mask to enable interrupt
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jmp short $+2 ; for 286's
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out dx,al ; write out new mask value
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mov ah,[oem1].bocw1m ; get mask for 2nd 8259 IMR
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or ah,ah ; if 0, don't need to do this
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jz installdone ;
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mov dx,[oem1].b8259m ; get port number for 2nd 8259 (A0=1)
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in al,dx ; read old IMR value
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mov [boldIMR],al ; save it to restore at termination
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and al,ah ; mask to enable interrupt
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jmp short $+2 ; for 286's
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out dx,al ; write out new mask value
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installdone:
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endif ;OEM
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assume ds:EMULATOR_DATA
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pop ds
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ret
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page
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; __FPTERMINATE87
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;
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; This routine should do the OEM 80x87 cleanup. This routine is called
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; before the program exits.
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;
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; DS = EMULATOR_DATA
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__FPTERMINATE87:
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push ds
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push ax
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push dx
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ifdef OEM
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mov ah,SETVECOP
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mov al,[oem1].intnum
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else
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mov ax,SETVECOP shl 8 + 2
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endif ;OEM
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lds dx,[oldvec]
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int OPSYS
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ifdef OEM
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; reset 8259 IMR's to original state
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push cs
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pop ds ; DS = CS
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assume ds:EMULATOR_TEXT
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cmp [oem1].aocw1m,0 ; did we have to change 1st 8259 IMR
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je term2nd8259 ; no - check 2nd 8259
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mov al,[aoldIMR] ; get old IMR
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mov dx,[oem1].a8259m ; get 1st 8259 (A0=1) port #
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out dx,al ; restore IMR
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term2nd8259:
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cmp [oem1].bocw1m,0 ; did we have to change 2nd 8259 IMR
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je terminatedone ; no
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mov al,[boldIMR] ; get old IMR
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mov dx,[oem1].b8259m ; get 2nd 8259 (A0=1) port #
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out dx,al ; restore IMR
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terminatedone:
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endif ;OEM
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pop dx
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pop ax
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pop ds
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assume ds:EMULATOR_DATA
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ret
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; Forced cleanup of 80x87 exception handling on Control-C
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ctlcexit:
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push ax
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push dx
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push ds
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call __FPTERMINATE87 ; forced cleanup of exception handler
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lds dx,[ctlc] ; load old control C vector
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mov ax,SETVECOP shl 8 + CTLCVEC
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int OPSYS
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pop ds
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pop dx
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pop ax
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jmp [ctlc] ; go through old vector
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page
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; __fpinterrupt87
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;
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; This is the 80x87 exception interrupt routine.
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;
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; All OEM specific interrupt and harware handling should be done in
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; __fpintreset because __FPEXCEPTION87 (the OEM independent 80x87
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; exception handler) may not return. __FPEXCEPTION87 also turns
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; interrupts back on.
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;
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PENDINGBIT= 80h ; Bit in status word for interrupt pending
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__fpinterrupt87:
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assume ds:nothing
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nop
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fnstsw [statwd] ; Store out exceptions
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push cx ; waste time
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mov cx,3
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self:
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loop self
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pop cx
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test byte ptr [statwd],PENDINGBIT ; Test for 80x87 interrupt
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jz not87int ; Not an 80x87 interrupt.
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ifdef OEM
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call __fpintreset ; OEM interrupt reset routine
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endif ;OEM
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call __FPEXCEPTION87 ; 80x87 error handling - may not return
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; this routine turns interrupts back on
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ifdef OEM
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cmp [oem1].share,0 ; Should we execute the old interrupt routine?
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jnz not87int ; if so then do it
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; else return from interrupt
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; If you fall through here to do further hardware resetting, things
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; may not always work because __FPEXCEPTION87 does not always return
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; This only happens when the 80x87 handler gets an exception that is
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; a fatal error in the language runtimes. I.e., divide by zero
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; is a fatal error in all the languages, unless the control word has
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; set to mask out divide by zero errors.
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endif ;OEM
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done8087:
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iret
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not87int:
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jmp [oldvec] ; We should never return from here.
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ifdef OEM
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__fpintreset:
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push ax
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push dx
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mov al,[oem1].aocw2 ; Load up EOI instruction.
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or al,al ; Is there at least one 8259 to be reset?
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jz Reset8259ret ; no
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mov dx,[oem1].a8259
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out dx,al ; Reset (master) 8259 interrupt controller.
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mov al,[oem1].bocw2 ; Load up EOI instruction.
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or al,al ; Is there a slave 8259 to be reset?
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jz Reset8259ret
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mov dx,[oem1].b8259
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out dx,al ; Reset slave 8259 interrupt controller.
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Reset8259ret:
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pop dx
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pop ax
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ret
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endif ;OEM
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EMULATOR_TEXT ends
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end
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