📄 interrup.n
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INT 31 - DOS32 v3.0+ - GET REAL MODE CALL BACK ADDRESS WITH RETF STACK FRAME
AX = EE20h
ESI = offset of the real mode call back function
Return: CF clear if successful
CX:DX = real mode address to call up to the protected mode
procedure
CF set on error
SeeAlso: AX=EE00h,AX=EE02h,AX=EE21h
--------E-31EE21------------------------
INT 31 - DOS32 v3.0+ - GET REAL MODE CALL BACK ADDRESS WITH IRET STACK FRAME
AX = EE21h
ESI = offset of the real mode call back function
Return: CF clear if successful
CX:DX = real mode address to call up to the protected mode
procedure
CF set on error
SeeAlso: AX=EE20h
--------E-31EE30------------------------
INT 31 - DOS32 v3.0+ - TERMINATE AND STAY RESIDENT
AX = EE30h
SeeAlso: AX=EE21h,AX=EE40h,INT 21/AH=31h
--------E-31EE40------------------------
INT 31 - DOS32 v3.0+ - UNDO PREVIOUS MEMORY ALLOCATION or DMA BUFFER
AX = EE40h
Return: CF clear if successful
CF set on error
SeeAlso: AX=EE41h,AX=EE42h
--------E-31EE41------------------------
INT 31 - DOS32 v3.0+ - ALLOCATE 16KB DMA BLOCK
AX = EE41h
Return: CF clear if successful
EBX -> 16KB DMA block (physical address)
EDX -> 16KB DMA block (offset address)
CF set on error
SeeAlso: AX=EE40h,AX=EE42h
--------E-31EE42------------------------
INT 31 - DOS32 v3.0+ - ALLOCATE MEMORY BLOCK
AX = EE42h
EDX = size in bytes
Return: CF clear if successful
EAX = size in bytes
EDX -> memory block
CF set on error
Note: size is rounded off to the next 4KB boundary
SeeAlso: AX=EE40h,AX=EE41h
--------E-31FF00-----------------------------
INT 31 P - CauseWay - "Info" - GET SYSTEM SELECTORS/FLAGS
AX = FF00h
Return: AX = selector for flag address space (base 00000000h, limit 4GB)
BX = selector for current PSP segment (limit 0100h)
(E)CX = size of DOS transfer buffer (max 64K)
DX = real-mode segment address of DOS transfer buffer
ES:(E)SI = protected-mode address of DOS transfer buffer
EDI = system flags (see #03162)
Program: CauseWay is a 386 DOS extender by Michael Devore and John Wildsmith
for use with Watcom C++ or assembly language programs
Notes: the entire transfer buffer can be addressed with a 16-bit offset in
protected mode
CauseWay always maps selector 0040h to the BIOS data segment at
real-mode segment 0040h; when not running under a DPMI host, CauseWay
also provides selectors A000h, B000h, and B800h mapped to video
memory
SeeAlso: AX=FF25h
Bitfields for CauseWay system flags:
Bit(s) Description (Table 03162)
0 32-bit code
1 virtual memory manage enabled
3-2 mode: 00 raw extended memory, 01 VCPI, 10 DPMI
4 DPMI available
5 VCPI available
6 no memory managers
7 application descriptor table type: 0 = GDT, 1 = LDT
14-8 reserved
15 debugging engine present
--------E-31FF01-----------------------------
INT 31 P - CauseWay - "IntXX" - SIMULATE REAL-MODE INTERRUPT
AX = FF01h
BL = interrupt number
ES:(E)DI -> real-mode register list (see #03148 at AX=0300h)
Return: register list updated
Note: CauseWay fills in the values for SS, SP, and FLAGS itself, and ignores
the values specified for CS and IP
SeeAlso: AX=0300h,AX=FF02h
--------E-31FF02-----------------------------
INT 31 P - CauseWay - "FarCallReal" - SIMULATE REAL-MODE FAR CALL
AX = FF02h
ES:(E)DI -> real-mode register list (see #03148 at AX=0300h)
Return: register list updated
SeeAlso: AX=0301h,AX=FF01h
--------E-31FF03-----------------------------
INT 31 P - CauseWay - "GetSel" - ALLOCATE NEW SELECTOR
AX = FF03h
Return: CF clear if successful
BX = new selector
CF set on error
Note: the new selector is initialized with a base address of 000000h, a limit
of 0000h, and attributes read/write expand-up data
SeeAlso: AX=FF04h,AX=FF05h,AX=FF06h
--------E-31FF04-----------------------------
INT 31 P - CauseWay - "RelSel" - RELEASE A SELECTOR
AX = FF04h
BX = selector
Return: CF clear if successful
CF set on error
SeeAlso: AX=FF03h,AX=FF06h
--------E-31FF05-----------------------------
INT 31 P - CauseWay - "CodeSel" - CONVERT SELECTOR TO EXECUTABLE CODE SELECTOR
AX = FF05h
BX = selector
CL = default operation size (00h = 16-bit, 01h = 32-bit)
Return: CF clear if successful
CF set on error
SeeAlso: AX=FF03h
--------E-31FF06-----------------------------
INT 31 P - CauseWay - "AliasSel" - CREATE READ/WRITE DATA ALIAS SELECTOR
AX = FF06h
BX = original selector
Return: CF clear if successful
AX = new data selector aliasing original selector
CF set on error
SeeAlso: AX=FF03h,AX=FF04h
--------E-31FF07-----------------------------
INT 31 P - CauseWay - "GetSelDet" - GET SELECTOR BASE AND LIMIT
AX = FF07h
BX = selector
Return: CF clear if successful
CX:DX = base address
SI:DI = limit (bytes)
CF set on error
SeeAlso: AX=FF08h,AX=FF09h
--------E-31FF08-----------------------------
INT 31 P - CauseWay - "GetSelDet32" - GET SELECTOR BASE AND LIMIT (32-bit)
AX = FF08h
Return: CF clear if successful
EDX = base address
ECX = limit (bytes)
CF set on error
SeeAlso: AX=FF07h,AX=FF0Ah
--------E-31FF09-----------------------------
INT 31 P - CauseWay - "SetSelDet" - SET SELECTOR BASE AND LIMIT
AX = FF09h
BX = selector
CX:DX = new base address
SI:DI = new byte-granular limit
Return: CF clear if successful
CF set on error
SeeAlso: AX=FF07h,AX=FF0Ah
--------E-31FF0A-----------------------------
INT 31 P - CauseWay - "SetSelDet32" - SET SELECTOR BASE AND LIMIT (32-bit)
AX = FF0Ah
BX = selector
EDX = new base address
ECX = new byte-granular limit
Return: CF clear if successful
CF set on error
SeeAlso: AX=FF08h,AX=FF09h
--------E-31FF0B-----------------------------
INT 31 P - CauseWay - "GetMem" - ALLOCATE BLOCK OF MEMORY
AX = FF0Bh
CX:DX = size in bytes (FFFFh:FFFFh to get size of largest available)
Return: CF clear if successful
BX = selector for accessing block if requested size not FFFFh:FFFFh
CX:DX = size of largest available block if requested FFFFh:FFFFh
CF set on error
SeeAlso: AX=FF0Ch,AX=FF0Dh,AX=FF0Fh,AX=FF10h,AX=FF2Ch
--------E-31FF0C-----------------------------
INT 31 P - CauseWay - "GetMem32" - ALLOCATE BLOCK OF MEMORY (32-bit)
AX = FF0Ch
ECX = size in bytes (FFFFFFFFh to get size of largest available block)
Return: CF clear if successful
BX = selector for accessing block if requested size not FFFFh:FFFFh
ECX = size of largest available block if requested FFFFh:FFFFh
CF set on error
SeeAlso: AX=FF0Bh,AX=FF0Eh,AX=FF0Fh,AX=FF11h
--------E-31FF0D-----------------------------
INT 31 P - CauseWay - "ResMem" - RESIZE MEMORY BLOCK
AX = FF0Dh
BX = selector for block to be resized
CX:DX = new size in bytes
Return: CF clear if successful
CF set on error
Note: the memory block may have to be copied to another location in order
to satisfy the requested new size, in which case the base address
of the selector is updated
SeeAlso: AX=FF0Bh,AX=FF0Eh,AX=FF12h
--------E-31FF0E-----------------------------
INT 31 P - CauseWay - "ResMem32" - RESIZE MEMORY BLOCK (32-bit)
AX = FF0Eh
BX = selector for block to be resized
ECX = new size in bytes
Return: CF clear if successful
CF set on error
Note: the memory block may have to be copied to another location in order
to satisfy the requested new size, in which case the base address
of the selector is updated
SeeAlso: AX=FF0Ch,AX=FF0Dh,AX=FF13h
--------E-31FF0F-----------------------------
INT 31 P - CauseWay - "RelMem" - RELEASE PREVIOUSLY ALLOCATED MEMORY
AX = FF0Fh
BX = selector for block to be released
Return: CF clear if successful
CF set on error
SeeAlso: AX=FF0Bh,AX=FF0Ch,AX=FF14h
--------E-31FF10-----------------------------
INT 31 P - CauseWay - "GetMemLinear" - ALLOCATE MEMORY WITHOUT SELECTOR
AX = FF10h
CX:DX = size of block in bytes
Return: CF clear if successful
SI:DI = linear address of allocated block
CF set on error
Note: this function may return addresses above 16M
SeeAlso: AX=FF0Bh,AX=FF11h,AX=FF12h,AX=FF14h
--------E-31FF11-----------------------------
INT 31 P - CauseWay - "GetMemLinear32" - ALLOCATE MEMORY WITHOUT SELECTOR
AX = FF11h
ECX = size of block in bytes
Return: CF clear if successful
ESI = linear address of allocated block
CF set on error
Note: this function may return addresses above 16M
SeeAlso: AX=FF0Ch,AX=FF10h,AX=FF13h,AX=FF14h
--------E-31FF12-----------------------------
INT 31 P - CauseWay - "ResMemLinear" - RESIZE LINEAR MEMORY BLOCK
AX = FF12h
CX:DX = new size in bytes
SI:DI = linear address of block to be resized
Return: CF clear if successful
SI:DI = new linear address of block
CF set on error
SeeAlso: AX=FF0Dh,AX=FF10h,AX=FF13h
--------E-31FF13-----------------------------
INT 31 P - CauseWay - "ResMemLinear32" - RESIZE LINEAR MEMORY BLOCK (32-bit)
AX = FF13h
ECX = new size in bytes
ESI = linear address of block to be resized
Return: CF clear if successful
ESI = new linear address of block
CF set on error
SeeAlso: AX=FF0Eh,AX=FF11h,AX=FF12h
--------E-31FF14-----------------------------
INT 31 P - CauseWay - "RelMemLinear" - RELEASE LINEAR MEMORY BLOCK
AX = FF14h
SI:DI = linear address of block to be released
Return: CF clear if successful
CF set on error
SeeAlso: AX=FF0Fh,AX=FF10h,AX=FF15h
--------E-31FF15-----------------------------
INT 31 P - CauseWay - "RelMemLinear32" - RELEASE LINEAR MEMORY BLOCK (32-bit)
AX = FF15h
ESI = linear address of block to be released
Return: CF clear if successful
CF set on error
SeeAlso: AX=FF0Fh,AX=FF11h,AX=FF15h
--------E-31FF16-----------------------------
INT 31 P - CauseWay - "GetMemNear" - ALLOCATE APPLICATION-RELATIVE MEMORY
AX = FF16h
EBX = size in bytes of block to allocate
Return: CF clear if successful
ESI = application-relative linear address of allocated block
CF set on error
SeeAlso: AX=FF17h,AX=FF18h,AX=FF19h
--------E-31FF17-----------------------------
INT 31 P - CauseWay - "ResMemNear" - RESIZE APPLICATION-RELATIVE MEMORY BLOCK
AX = FF17h
EBX = size in bytes of block to allocate
ESI = application-relative linear address of block
Return: CF clear if successful
ESI = new application-relative linear address of block
CF set on error
SeeAlso: AX=FF16h,AX=FF18h,AX=FF19h
--------E-31FF18-----------------------------
INT 31 P - CauseWay - "RelMemNear" - RELEASE APPLICATION-RELATIVE MEMORY BLOCK
AX = FF18h
ESI = application-relative linear address of block
Return: CF clear if successful
CF set on error
SeeAlso: AX=FF16h,AX=FF17h,AX=FF19h
--------E-31FF19-----------------------------
INT 31 P - CauseWay - "Linear2Near" - CONVERT LINEAR TO APP-RELATIVE ADDRESS
AX = FF19h
ESI = linear address
Return: ESI = application-relative linear address
SeeAlso: AX=FF1Ah
--------E-31FF1A-----------------------------
INT 31 P - CauseWay - "Near2Linear" - CONVERT APP-RELATIVE TO LINEAR ADDRESS
AX = FF1Ah
ESI = application-relative linear address
Return: ESI = linear address
SeeAlso: AX=FF19h
--------E-31FF1B-----------------------------
INT 31 P - CauseWay - "LockMem" - LOCK REGION OF MEMORY
AX = FF1Bh
BX:CX = starting linear address
SI:DI = size of region in bytes
Return: CF clear if successful
CF set on error
Desc: prevent memory from being swapped out by the virtual memory manager
Note: locks are applied on 4K page boundaries, so memory above and below
the specified region may be locked as well
SeeAlso: AX=FF1Ch,AX=FF1Dh
--------E-31FF1C-----------------------------
INT 31 P - CauseWay - "LockMem32" - LOCK REGION OF MEMORY (32-bit)
AX = FF1Ch
ESI = starting linear address
ECX = size of region in bytes
Return: CF clear if successful
CF set on error
Desc: prevent memory from being swapped out by the virtual memory manager
Note: locks are applied on 4K page boundaries, so memory above and below
the specified region may be locked as well
SeeAlso: AX=FF1Bh,AX=FF1Eh,AX=FF1Fh
--------E-31FF1D-----------------------------
INT 31 P - CauseWay - "UnLockMem" - UNLOCK REGION OF MEMORY
AX = FF1Dh
BX:CX = starting linear address
SI:DI = size of region in bytes
Return: CF clear
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