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AX = 0001h
Return:
ES:BX -> far call entry point (see #03788,#03803)
See Also: AX=0000h
(Table 03787) Values for HugeRealMode Server error code: 00h successful 01h unknown function 02h A20 disabled 03h A20 enabled 04h memory allocation error 05h memory not fixeable (LOCK) 06h memory not deallocaable 07h memory not moveable (UNLOCK) 08h change in memory allocation size not possible 09h file error (with .XMF-file) 0Ah memory error (with .XMF-file) 0Bh unknown procedure (currently Turbo Pascal unit only)
(Table 03788) Call HugeRealMode Server "Enable A20" function with:. AL = 00h
Return:
AX = error code (see #03787)
Note: The HugeRealMode Server requires an XMS-driver like HIMEM.SYS loaded before HUGEREAL (for XMS-memory allocation and A20 control). It utilizes some undocumented 386+ features to enable 4G code and data segments (flat memory model) in the CPUs real-mode. It is not compatible with V86-mode (as with most EMM386). For maximum speed and compatibility with DOS it uses a two stage interrupt model (see #03791)
See Also: #03789 - #03790 - #03791
(Table 03789) Call HugeRealMode Server "Disable A20" function with:. AL = 01h
Return:
AX = error code (see #03787)
See Also: #03788 - #03790
(Table 03790) Call HugeRealMode Server "Query A20 State" function with:. AL = 02h
Return:
AX = A20 state (0000h disabled, 0001h enabled)
See Also: #03788 - #03789
(Table 03791) Call HugeRealMode Server "Enable Two-Stage Interrupt Model" function with:. AL = 03h
Return:
AX = error code (see #03787)
Notes: If the two stage interrupt model is disabled, the IP must stay below 1MB, because the high word of EIP is not saved correctly by the standard interrupt management in real mode. Routines in extended memory may only be called with interrupts disabled (only usable for very short routines).. If the two stage interupt model is enabled, these conventions are not required. The outer (transparent) ISRs save the higher word of EIP
in the high word of CR3 (possible modification:
In memory, if this is not safe) and then invoke the standard ISRs.. Because of this handling, one should use pseudo segmented code even in extended memory (64K blocks located on 64K boundaries) to avoid the misalignment of the saved EIP (in CR3). Another way is to track and realign CR3 each time when jumping over a 64K boundary in extended memory
See Also: #03788 - #03792
(Table 03792) Call HugeRealMode Server "Disable Two-Stage Interrupt Model" function with:. AL = 04h
Return:
AX = error code (see #03787)
See Also: #03788 - #03791
(Table 03793) Call HugeRealMode Server "Get Segment Address Of Server-Management Range" with:. AL = 05h
Return:
AX = error code (see #03787) ES = segment address
See Also: #03803
(Table 03794) Call HugeRealMode Server "Allocate Memory" function with:. AL = 06h. DX = length in KB
Return:
AX = error code (see #03787) DX = handle EBX = start address of allocated block
See Also: #03795 - #03796
(Table 03795) Call HugeRealMode Server "Deallocate Memory" function with:. AL = 07h. DX = handle
Return:
AX = error code (see #03787)
See Also: #03794 - #03796
(Table 03796) Call HugeRealMode Server "Modify Allocated Memory Size" function with:. AL = 08h. DX = handle. BX = new size in KB
Return:
AX = error code (see #03787) EBX = new address
See Also: #03794 - #03795
(Table 03797) Call HugeRealMode Server "Load .XMF-file" function with:. AL = 09h. ES:BX -> filename (see #03798)
Return:
AX = error code (see #03787) ECX = target address
Notes: Memory must be allocated before loading. .XMF file format (eXtended Memory executable File format) is supported by the HugeRealMode server for easier handling of XMS-code.. The utility CONFXMF converts .OBJ-files (.COM 'tiny' model) to .XMF-format
See Also: #03794
Format of .XMF program file header: Offset Size Description (Table 03798) 00h DWORD signature "XMF_" 04h WORD length of programs code 06h WORD count of 32bit addresses to relocate 08h WORD offset to code start (releative to file start) (see #03799) 0Ah WORD relocation table
Note: Each word contains a 16bit address, where a relocation has to be performed
See Also: #03797 - #03799
Format of .XMF-file code header: Offset Size Description (Table 03799) 00h WORD count of exported functions 02h N PWORDs 48bit pointers (16bit segment+32bit offset) to each function (16bit segment is always zero) var start of program's code
See Also: #03797 - #03798
(Table 03800) Call HugeRealMode Server "Set Segment Limits" function with:. AL = 0Ah. BL = segment limits (see #03801)
Return:
AX = error code (see #03787)
See Also: #03793
Bitfields for HugeRealMode Server segment limits: Bit(s) Description (Table 03801)
7 CS size:
1=4GB, 0=64KB 6-5 not used4 SS size:
1=4GB, 0=64KB 3 GS size 2 FS size 1 ES size 0 DS size
See Also: #03800
(Table 03802) Call HugeRealMode Server "Transfer Memory From DOS To XMS" function with:. AL = 0Bh. ES:SI = source address. EDI = target address. ECX = length
Return:
AX = error code
See Also: #03803
(Table 03803) Call HugeRealMode Server "Transfer Memory From XMS To DOS" function with:. AL = 0Ch. ESI = source address. ES:DI = target address. ECX = length
Return:
AX = error code
See Also: #03802
Category: DOS Extenders - Int 78h - H
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