385 lines
8.8 KiB
NASM
385 lines
8.8 KiB
NASM
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page ,132
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;-----------------------------Module-Header-----------------------------;
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; Module Name: PAGELOCK
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;
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; This module contains functions for page locking memory using DPMI
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;
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; Created: 03-20-90
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; Author: Todd Laney [ToddLa]
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;
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; Copyright (c) 1984-1990 Microsoft Corporation
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;
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; Exported Functions: none
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;
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; Public Functions: DpmiPageLock
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; DpmiPageUnlock
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;
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; Public Data: none
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;
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; General Description:
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;
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; Restrictions:
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;
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;-----------------------------------------------------------------------;
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?PLM = 1
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?WIN = 0
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?NODATA = 1
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.286
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.xlist
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include cmacros.inc
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include int31.inc
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.list
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externA __AHINCR ; KERNEL
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externFP GlobalHandle ; KERNEL
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externFP GlobalHandleNoRip ; KERNEL
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externFP GlobalFix ; KERNEL
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externFP GlobalUnFix ; KERNEL
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ifndef SEGNAME
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SEGNAME equ <_TEXT>
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endif
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createSeg %SEGNAME, CodeSeg, word, public, CODE
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Int31_SelMgt_Get_Base EQU ((Int31_Sel_Mgt shl 8) + SelMgt_Get_Base )
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Int31_Lock_Region EQU ((Int31_Page_Lock shl 8) + Lock_Region )
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Int31_Unlock_Region EQU ((Int31_Page_Lock shl 8) + Unlock_Region )
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; The following structure should be used to access high and low
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; words of a DWORD. This means that "word ptr foo[2]" -> "foo.hi".
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LONG struc
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lo dw ?
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hi dw ?
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LONG ends
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FARPOINTER struc
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off dw ?
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sel dw ?
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FARPOINTER ends
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sBegin CodeSeg
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assumes cs,CodeSeg
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assumes ds,nothing
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assumes es,nothing
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;---------------------------Public-Routine------------------------------;
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; DpmiPageLock
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;
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; page lock a region using DPMI
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;
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; Entry:
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; lpBase Selector:offset of base of region to lock
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; dwSize size in bytes of region to lock
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;
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; Returns:
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; NZ
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; AX = TRUE if successful
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;
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; Error Returns:
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; Z
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; AX = FALSE if error
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;
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; Registers Preserved:
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; BP,DS,SI,DI
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; Registers Destroyed:
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; AX,BX,CX,DX,FLAGS
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; Calls:
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; INT 31h
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; History:
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;
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; Wed 04-Jan-1990 13:45:58 -by- Todd Laney [ToddLa]
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; Created.
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;-----------------------------------------------------------------------;
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assumes ds,nothing
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assumes es,nothing
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cProc DpmiPageLock, <NEAR>, <>
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; parmD lpBase
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; parmD dwSize
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cBegin nogen
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mov cx,Int31_Lock_Region
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jmp short DpmiPageLockUnLock
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cEnd nogen
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;---------------------------Public-Routine------------------------------;
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; DpmiPageUnlock
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;
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; un-page lock a region using DPMI
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;
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; Entry:
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; lpBase Selector:offset of base of region to unlock
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; dwSize size in bytes of region to unlock
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;
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; Returns:
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; NZ
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; AX = TRUE if successful
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;
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; Error Returns:
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; Z
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; AX = FALSE if error
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;
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; Registers Preserved:
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; BP,DS,SI,DI
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; Registers Destroyed:
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; AX,BX,CX,DX,FLAGS
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; Calls:
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; INT 31h
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; History:
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;
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; Wed 04-Jan-1990 13:45:58 -by- Todd Laney [ToddLa]
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; Created.
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;-----------------------------------------------------------------------;
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assumes ds,nothing
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assumes es,nothing
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cProc DpmiPageUnlock, <NEAR>, <>
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; parmD lpBase
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; parmD dwSize
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cBegin nogen
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mov cx,Int31_Unlock_Region
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errn$ DpmiPageLockUnLock
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cEnd nogen
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cProc DpmiPageLockUnLock, <NEAR>, <si,di>
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parmD lpBase
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parmD dwSize
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cBegin
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mov si,cx ; save lock/unlock flag
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mov ax,Int31_SelMgt_Get_Base
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mov bx,lpBase.sel
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int 31h ; returns CX:DX selector base
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jc dpl_exit
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mov bx,cx ; BX:CX is base
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mov cx,dx
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add cx,lpBase.off ; add offset into selector base
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adc bx,0
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mov ax,si ; get lock/unlock flag
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mov si,dwSize.hi ; SI:DI length
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mov di,dwSize.lo
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int 31h ; lock or unlock it
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dpl_exit:
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cmc ; set carry iff success
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sbb ax,ax ; return TRUE/FALSE
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cEnd
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;---------------------------Public-Routine------------------------------;
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; HugePageLock
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;
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; page lock a range of windows allocated memory
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;
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; Entry:
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; lpBase Selector:offset of base of region to lock
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; dwSize size in bytes of region to lock
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;
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; Returns:
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; AX = TRUE if successful
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;
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; Error Returns:
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; AX = FALSE if error
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;
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; Registers Preserved:
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; BP,DS,SI,DI
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; Registers Destroyed:
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; AX,BX,CX,DX,FLAGS
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; Calls:
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; INT 31h
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; History:
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;
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; Wed 04-Jan-1990 13:45:58 -by- Todd Laney [ToddLa]
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; Created.
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;-----------------------------------------------------------------------;
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assumes ds,nothing
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assumes es,nothing
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cProc HugePageLock, <FAR, PUBLIC>, <>
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parmD lpBase
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parmD dwSize
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cBegin
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mov ax,lpBase.sel ; NULL pointer, invalid
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or ax,ax
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jz GPageLock_Exit
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call HugeGlobalFix ; fix the memory, then page lock
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cCall DpmiPageLock,<lpBase, dwSize>
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jnz GPageLock_Exit
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mov ax,lpBase.sel ; page lock failed, un-fix
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call HugeGlobalUnFix ; and return failure
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xor ax,ax
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GPageLock_Exit:
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cEnd
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;---------------------------Public-Routine------------------------------;
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; HugePageUnlock
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;
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; un-page lock a range of windows alocated memory, (locked with HugePageLock)
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;
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; Entry:
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; lpBase Selector:offset of base of region to lock
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; dwSize size in bytes of region to lock
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;
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; Returns:
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; none
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;
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; Registers Preserved:
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; BP,DS,SI,DI
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; Registers Destroyed:
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; AX,BX,CX,DX,FLAGS
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; Calls:
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; INT 31h
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; History:
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;
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; Wed 04-Jan-1990 13:45:58 -by- Todd Laney [ToddLa]
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; Created.
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;-----------------------------------------------------------------------;
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assumes ds,nothing
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assumes es,nothing
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cProc HugePageUnlock, <FAR, PUBLIC>, <>
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parmD lpBase
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parmD dwSize
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cBegin
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cCall DpmiPageUnlock,<lpBase, dwSize>
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mov ax,lpBase.sel
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call HugeGlobalUnFix
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cEnd
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;---------------------------Public-Routine------------------------------;
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; HugeGlobalFix
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;
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; fix the global object that represents the passed selector
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;
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; Entry:
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; AX = SELECTOR
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;
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; Returns:
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; none
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;
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; Registers Preserved:
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; BP,DS,SI,DI
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; Registers Destroyed:
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; AX,BX,CX,DX,FLAGS
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; Calls:
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; GlobalFix
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; HugeGlobalHandle
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; History:
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;
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; Wed 04-Jan-1990 13:45:58 -by- Todd Laney [ToddLa]
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; Created.
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;-----------------------------------------------------------------------;
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assumes ds,nothing
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assumes es,nothing
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HugeGlobalFix proc near
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call HugeGlobalHandle
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jz HugeGlobalFixExit
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cCall GlobalFix,<ax>
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HugeGlobalFixExit:
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ret
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HugeGlobalFix endp
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;---------------------------Public-Routine------------------------------;
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; HugeGlobalUnFix
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;
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; un-fix the global object that represents the passed selector
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;
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; Entry:
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; AX = SELECTOR
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;
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; Returns:
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; none
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;
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; Registers Preserved:
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; BP,DS,SI,DI
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; Registers Destroyed:
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; AX,BX,CX,DX,FLAGS
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; Calls:
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; HugeGlobalHandle
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; GlobalUnFix
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; History:
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;
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; Wed 04-Jan-1990 13:45:58 -by- Todd Laney [ToddLa]
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; Created.
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;-----------------------------------------------------------------------;
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assumes ds,nothing
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assumes es,nothing
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HugeGlobalUnFix proc near
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call HugeGlobalHandle
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jz HugeGlobalUnFixExit
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cCall GlobalUnFix,<ax>
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HugeGlobalUnFixExit:
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ret
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HugeGlobalUnFix endp
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;---------------------------Public-Routine------------------------------;
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; HugeGlobalHandle
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;
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; Entry:
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; AX = SELECTOR to global object
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;
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; Returns:
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; NZ
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; AX = HANDLE of global object
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;
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; Error Returns:
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; Z
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; AX = 0 if error
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;
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; Registers Preserved:
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; BP,DS,SI,DI
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; Registers Destroyed:
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; AX,BX,CX,DX,FLAGS
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; Calls:
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; GlobalHandleNoRip
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; History:
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;
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; Wed 04-Jan-1990 13:45:58 -by- Todd Laney [ToddLa]
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; Created.
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;-----------------------------------------------------------------------;
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assumes ds,nothing
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assumes es,nothing
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HugeGlobalHandle proc near
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push si
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mov si,ax
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or ax,ax ; test for NULL pointer!
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jz HugeGlobalHandleExit
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HugeGlobalHandleAgain:
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cCall GlobalHandleNoRip,<si>
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sub si,__AHINCR
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or ax,ax
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jz HugeGlobalHandleAgain
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HugeGlobalHandleExit:
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pop si
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ret
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HugeGlobalHandle endp
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sEnd
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end
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