发信人: black()
整理人: wenbobo(2002-12-06 22:36:44), 站内信件
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这东西不用连载，凡是分析DOS技术的书都有，
XMS 调 用 简 介
使用 XMS 前必须测试系统有无加载 HIMEM.SYS，方法如下：
MOV AX,4300H
INT 2FH
CMP AL,80H
JNE NO_XMS ; XMS 不存在
然后获得 XMS 驱动程序控制功能的地址，如下：
MOV AX,4310H
INT 2FH
MOV WORD PTR XMS_CONTROL, BX
MOV WORD PTR XMS_CONTROL+2, ES
现在就可以给相应的寄存器赋值，用 CALL [XMS_CONTROL] 调用 XMS。
┌────┬────────┬───────────┬──────────────┐
│ 功能号 │ 功能解释 │ 调用寄存器 │ 返回寄存器 │
├────┼────────┼───────────┼──────────────┤
│ 08H │最大可用 XMS尺 │ AH = 08H │ AX=最大可用 XMS 内存 │
│ │寸，以KB为单位 │ │ │
├────┼────────┼───────────┼──────────────┤
│ 09H │分配 XMS 空间 │ AH = 09H │ AH=0000H失败，AB=0001H成功 │
│ │ │ DX = 以KB计的内存块 │ DX = 分配块的句柄( HANDLE )│
│ │ │ │ BL = 错误代码 │
├────┼────────┼───────────┼──────────────┤
│ 0AH │释放 XMS 空间 │ AH = 0AH │ AH=0000H失败，AB=0001H成功 │
│ │ │ DX = 释放块句柄 │ BL = 错误代码 │
├────┼────────┼───────────┼──────────────┤
│ 0BH │移动 XMS 块数据 │ AH = 0BH │ AH=0000H失败，AB=0001H成功 │
│ │ │ DS:SI=指向 XMS 移动 │ BL = 错误代码 │
│ │ │ 结构的指针(附表) │ │
├────┼────────┼───────────┼──────────────┤
│ │ │ │ │
└────┴────────┴───────────┴──────────────┘
XMS 移动结构
┌───────┬──────────────┐
│ 偏 移 量 │ 含 义 │
├───────┼──────────────┤
│ 000H - 003H │ 需传送的字节数 │
├───────┼──────────────┤
│ 004H - 005H │ 源块句柄 │
├───────┼──────────────┤
│ 006H - 009H │ 32位源段址及偏移值 │
├───────┼──────────────┤
│ 00AH - 00BH │ 目的句柄 │
├───────┼──────────────┤
│ 00CH - 00FH │ 32位目的段址及偏移值 │
└───────┴──────────────┘
XMS (Int 2F/43; Multiplex)
INT 2F - INSTALLATION CHECK
AX = 4300h
Return: AL = 80h XMS driver installed
AL <> 80h no driver
Notes: XMS gives access to extended memory and noncontiguous/nonEMS
memory above 640K
this installation check DOES NOT follow the format used by other
software
SeeAlso: AX=4310h
--------
INT 2F - XMS - GET DRIVER ADDRESS
AX = 4310h
Return: ES:BX -> driver entry point
SeeAlso: AX=4300h
Perform a FAR call to the driver entry point with AH set to the function
code
AH function
00h Get XMS version number
Return: AX = XMS version (in BCD)
BX = internal revision number
DX = 0001h if HMA (1M to 1M + 64K) exists
0000h if HMA does not exist
01h Request High Memory Area (1M to 1M + 64K)
DX = memory in bytes (for TSR or device drivers)
FFFFh if application program
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
02h Release High Memory Area
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
03h Global enable A20, for using the HMA
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
04h Global disable A20
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
05h Local enable A20, for direct access to extended memory
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
06h Local disable A20
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
07h Query A20 state
Return: AX = 0001h enabled
= 0000h disabled
BL = error code (0 = successful)
08h Query free extended memory, not counting HMA
Return: AX = size of largest extended memory block in K
DX = total extended memory in K
BL = error code (see below)
09h Allocate extended memory block
DX = Kbytes needed
Return: AX = 0001h success
DX = handle for memory block
= 0000h failure
BL = error code (see below)
0Ah Free extended memory block
DX = handle of block to free
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
0Bh Move extended memory block
DS:SI -> EMM structure (see below)
Note: if either handle is 0000h, the corresponding offset is
considered to be an absolute segment:offset address in
directly addressable memory
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
0Ch Lock extended memory block
DX = handle of block to lock
Return: AX = 0001h success
DX:BX = 32-bit linear address of locked block
= 0000h failure
BL = error code (see below)
0Dh Unlock extended memory block
DX = handle of block to unlock
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
0Eh Get handle information
DX = handle for which to get info
Return: AX = 0001h success
BH = block's lock count
BL = number of free handles left
DX = block size in K
= 0000h failure
BL = error code (see below)
0Fh Reallocate extended memory block
DX = handle of block
BX = new size of block in K
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
10h Request upper memory block (nonEMS memory above 640K)
DX = size of block in paragraphs
Return: AX = 0001h success
BX = segment address of UMB
DX = actual size of block
= 0000h failure
BL = error code (see below)
DX = largest available block
11h Release upper memory block
DX = segment address of UMB to release
Return: AX = 0001h success
= 0000h failure
BL = error code (see below)
Note: HIMEM.SYS requires at least 256 bytes free stack space
Format of EMM structure:
Offset Size Description
00h DWORD number of bytes to move (must be even)
04h WORD source handle
06h DWORD offset into source block
0Ah WORD destination handle
0Ch DWORD offset into destination block
Error codes returned in BL:
80h Function not implemented
81h Vdisk was detected
82h An A20 error occurred
8Eh a general driver error
8Fh unrecoverable driver error
90h HMA does not exist
91h HMA is already in use
92h DX is less than the /HMAMIN= parameter
93h HMA is not allocated
94h A20 line still enabled
A0h all extended memory is allocated
A1h all available extended memory handles are allocated
A2h Invalid handle
A3h Source handle is invalid
A4h Source offset is invalid
A5h Destination handle is invalid
A6h Destination offset is invalid
A7h Length is invalid
A8h Move has an invalid overlap
A9h Parity error occurred
AAh Block is not locked
ABh Block is locked
ACh Block lock count overflowed
ADh Lock failed
B0h Only a smaller UMB is available
B1h No UMB's are available
B2h UMB segment number is invalid
【 在 gdxkz (Ice Bird) 的大作中提到: 】
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