Int 2F/AX=43E1h

DOS Protected Mode Services (DPMS) v1.0 - REGISTER CLIENT

AX = 43E1h
CX = required protected-mode stack size in bytes
ES:DI -> DPMS client interface structure (see #02794)

Return:
AX = 0000h if supported
CF clear
ES:DI buffer filled with API entry point code from offset 0Ah

Note: The client is allowed to copy the returned API code to any location in memory, and need not keep the three code fields together

See Also: AX=43E0h - AX=43E2h - AX=43E3h


Format of DPMS client interface structure:

Offset  Size    Description     (Table 02794)
00h    WORD    0000h (structure version / flags)
02h  8 BYTEs   blank-padded client name
0Ah  7 BYTEs   real/virtual-86 mode API code (see #02795)
11h    BYTE    space for return instruction
set to C3h for near return, CBh for far return
12h  7 BYTEs   16-bit protected-mode API code (see #02795)
19h    BYTE    space for return instruction
set to C3h for near return, CBh for far return
1Ah  9 BYTEs   32-bit protected-mode API code (see #02795)
23h    BYTE    space for return instruction
set to C3h for near return, CBh for far return

Note: The DPMS server fills the return opcode bytes with zeros and DPMS requests will thus crash the system unless the application explicitly sets them (some early versions set them to C3h by default, but one should not rely on that)



(Table 02795)
Call DPMS entry point with:.
AX = 0000h unregister client from server
---control transfer functions---.
AX = 0100h call protected-mode procedure
CX = number of words of stack to copy
ES:(E)DI -> callup/down register structure (see #02797)
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0101h call real-mode procedure (RETF return)
CX = number of words of stack to copy
ES:(E)DI -> callup/down register structure (see #02797)
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0102h call real-mode procedure (IRET return)
CX = number of words of stack to copy
ES:(E)DI -> callup/down register structure (see #02797)
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0103h call real-mode interrupt handler
BL = interrupt number
CX = number of words of stack to copy
ES:(E)DI -> callup/down register structure (see #02797)
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0104h register default protected mode procedure
ES:(E)DI -> default register structure (see #02798)
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0105h register default real-mode procedure (RETF return)
ES:(E)DI -> default register structure (see #02798)
Return:
CF clear if successful
CF set on error
AX = error code (see #02796)

Note: The procedure will be called from 16-bit prot. mode. AX = 0106h register default real-mode procedure (IRET return) ES:(E)DI -> default register structure (see #02798)

Return:
CF clear if successful
CF set on error
AX = error code (see #02796)

Note: The procedure will be called from 16-bit prot. mode. AX = 0107h register default real-mode interrupt handler BL = interrupt number ES:(E)DI -> default register structure (see #02798)

Return:
CF clear if successful
CF set on error
AX = error code (see #02796)

Note: The handler will be called from 16-bit protected mode. AX = 0108h register default real-mode procedure (RETF return) ES:(E)DI -> default register structure (see #02798)

Return:
CF clear if successful
CF set on error
AX = error code (see #02796)

Note: The procedure will be called from 32-bit prot. mode. AX = 0109h register default real-mode procedure (IRET return) ES:(E)DI -> default register structure (see #02798)

Return:
CF clear if successful
CF set on error
AX = error code (see #02796)

Note: The procedure will be called from 32-bit prot. mode. AX = 010Ah register default real-mode interrupt handler BL = interrupt number ES:(E)DI -> default register structure (see #02798)

Return:
CF clear if successful
CF set on error
AX = error code (see #02796)

Note: The handler will be called from 32-bit protected mode ---descriptor management---. AX = 0200h allocate descriptors CX = number of descriptors to allocate

Return:
CF clear if successful
AX = selector for first descriptor allocated
CF set on error
AX = error code (see #02796).
AX = 0201h free a descriptor
BX = selector for descriptor
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0202h create alias descriptor
BX = selector for descriptor to be aliased
Return:
CF clear if successful
AX = alias descriptor
CF set on error
AX = error code (see #02796).
AX = 0203h build alias to real-mode segment
BX = descriptor
CX = real-mode segment
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0204h set descriptor base
BX = descriptor
CX:DX = base address
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0205h set descriptor limit
BX = descriptor
CX = limit
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0206h set descriptor type/attribute
BX = descriptor
CL = type
CH = attribute
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0207h get descriptor base
BX = descriptor
Return:
CF clear if successful
CX:DX = base address
CF set on error
AX = error code (see #02796)
---linear memory functions---.
AX = 0300h get size of largest free block of memory
Return:
CF clear if successful
BX:CX = size
CF set on error
AX = error code (see #02796).
AX = 0301h allocate block of extended memory
BX:CX = required size
Return:
CF clear if successful
BX:CX = base address
SI:DI = handle
CF set on error
AX = error code (see #02796).
AX = 0302h free block of extended memory
SI:DI = handle
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0303h map linear memory
ES:(E)DI -> DDS (see #02799)
Return:
CF clear if successful
BX:CX = base address
SI:DI = handle
CF set on error
AX = error code (see #02796).
AX = 0304h unmap linear memory
SI:DI = handle
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0305h get page table entries
ESI = linear address
(E)CX = count
ES:(E)DI -> buffer for page table entries
Return:
CF clear if successful
ES:(E)DI buffer filled
CF set on error
AX = error code (see #02796).
AX = 0306h set page table entries
EBX = linear memory handle
ESI = linear address
(E)CX = count
ES:(E)DI -> buffer containing page table entries
Return:
CF clear if successful
CF set on error
AX = error code (see #02796).
AX = 0307h get largest mappable block size
Return:
CF clear if successful
BX:CX = size
CF set on error
AX = error code (see #02796)
---miscellaneous---.
AX = 0400h relocate segment to extended memory
ES:SI = base address
CX = limit
BL = type
BH = attribute
DX = selector or 0000h
Return:
CF clear if successful
AX = selector
BX:CX = new base address
SI:DI = handle
CF set on error
AX = error code (see #02796)

Note: The beta DPMS specification, which is still supported by the Novell DOS 7.0 DPMS host, only supported functions 0100h-0103h, 0200h-0207h, 0300h-0304h, and 0400h

(Table 02796) Values for DPMS error code: 8000h general error 8001h unsupported function 8002h unable to switch to protected mode 8004h no default stack defined 8005h unknown client 8010h resource unavailable 8011h descriptor unavailable 8012h linear memory unavailable 8013h physical memory unavailable 8021h invalid value 8022h invalid selector 8023h invalid handle 8025h invalid linear address

Format of DPMS callup/down register structure: Offset Size Description (Table 02797) 00h DWORD EDI 04h DWORD ESI 08h DWORD EBP 0Ch 4 BYTEs reserved (0) (ESP, may be used by DPMS server) 10h DWORD EBX 14h DWORD EDX 18h DWORD ECX 20h DWORD EAX 24h DWORD EIP 28h WORD CS 2Ah 2 BYTEs reserved (0) 2Ch DWORD EFLAGS 30h DWORD ESP 34h WORD SS 36h 2 BYTEs reserved (0) 38h WORD ES 3Ah 2 BYTEs reserved (0) 3Ch WORD DS 3Eh 2 BYTEs reserved (0) 40h WORD FS 42h 2 BYTEs reserved (0) 44h WORD GS 46h 2 BYTEs reserved (0)

Format of DPMS default register structure: Offset Size Description (Table 02798) 00h DWORD EIP 04h WORD CS 06h 2 BYTEs reserved (0) 08h WORD number of words to copy from stack to stack 0Ah BYTE (call) 00h (ret) nonzero if call could not be made 0Bh BYTE reserved (may be used by some servers) 0Ch DWORD ESP 10h WORD SS 12h 2 BYTEs reserved (0) 14h WORD ES 16h 2 BYTEs reserved (0) 18h WORD DS 1Ah 2 BYTEs reserved (0) 1Ch WORD FS 1Eh 2 BYTEs reserved (0) 20h WORD GS 22h 2 BYTEs reserved (0) 24h 9 BYTEs API entry code (filled in by server)

Format of DPMS lock DDS: Offset Size Description (Table 02799) 00h DWORD total size in bytes 04h DWORD offset 08h WORD segment or selector 0Ah WORD reserved 0Ch WORD maximum number of physical blocks structure has space for 0Eh WORD number of physical blocks listed 10h DWORD physical address of first block 14h DWORD size in bytes of first block. ...

Category: Memory Management - Int 2Fh - D

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