173 lines
4.3 KiB
NASM
173 lines
4.3 KiB
NASM
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page ,132
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;----------------------------Module-Header------------------------------;
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; Module Name: FLAT.ASM
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;
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; init/term routines for using flat pointers
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;
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; LocalAlloc should go through here!
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;
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;-----------------------------------------------------------------------;
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.286
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?PLM=1
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?WIN=0
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.xlist
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include cmacros.inc
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.list
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;--------------------------------------------------------------------------;
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;--------------------------------------------------------------------------;
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sBegin Data
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public flatBase
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public flatSel
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flatSel dw 0
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flatBase dd 0
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KernelLocalAlloc dd 0
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sEnd
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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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sBegin CodeSeg
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assumes cs,CodeSeg
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assumes ds,Data
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assumes es,nothing
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externFP GetSelectorBase ; in KERNEL
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externFP SetSelectorBase ; in KERNEL
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externFP GetSelectorLimit ; in KERNEL
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externFP SetSelectorLimit ; in KERNEL
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externFP GlobalWire ; in KERNEL
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externFP GlobalUnwire ; in KERNEL
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externFP GlobalFix ; in KERNEL
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externFP GlobalUnfix ; in KERNEL
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; externFP KernelLocalAlloc ; in KERNEL
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externFP GetProcAddress ; in KERNEL
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externFP GetModuleHandle ; in KERNEL
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externFP AllocSelector ; in KERNEL
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externFP FreeSelector ; in KERNEL
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;--------------------------------------------------------------------------;
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;
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; FlatInit
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;
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;--------------------------------------------------------------------------;
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cProc FlatInit, <FAR, PUBLIC, PASCAL>
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cBegin
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; cCall GlobalWire, <ds>
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cCall GlobalFix, <ds>
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cCall AllocSelector,<ds>
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mov [flatSel],ax
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mov bx,ax
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mov ax,0008h ; DPMI Set Limit
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mov cx,-1
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mov dx,-1
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int 31h
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; cCall SetSelectorLimit,<ax,-1,-1>
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cCall GetSelectorBase, <ds>
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mov word ptr flatBase[0],ax
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mov word ptr flatBase[2],dx
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cEnd
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;--------------------------------------------------------------------------;
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;
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; FlatTerm
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;
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;--------------------------------------------------------------------------;
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cProc FlatTerm, <FAR, PUBLIC, PASCAL>
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cBegin
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cCall SetSelectorLimit,<[flatSel],0,0>
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cCall FreeSelector,<[flatSel]>
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; cCall GlobalUnwire, <ds>
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cCall GlobalUnfix, <ds>
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mov word ptr [flatBase][0],0
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mov word ptr [flatBase][2],0
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mov [flatSel],0
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cEnd
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;--------------------------------------------------------------------------;
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;
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; LocalAlloc
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;
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;--------------------------------------------------------------------------;
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szKernel: db "KERNEL",0
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cProc LocalAlloc, <FAR, PUBLIC, PASCAL>
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ParmW flags
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ParmW bytes
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cBegin
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mov ax,word ptr [KernelLocalAlloc][0]
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or ax,word ptr [KernelLocalAlloc][2]
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jnz @f
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lea ax,szKernel
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cCall GetModuleHandle,<cs,ax>
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cCall GetProcAddress,<ax, 0, 5>
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mov word ptr [KernelLocalAlloc][0],ax
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mov word ptr [KernelLocalAlloc][2],dx
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@@: mov ax,word ptr [flatBase][0]
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or ax,word ptr [flatBase][2]
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pushf
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jz @f
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cCall FlatTerm
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@@: cCall KernelLocalAlloc, <flags, bytes>
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popf
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jz @f
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push ax
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cCall FlatInit
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pop ax
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@@:
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cEnd
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;--------------------------------------------------------------------------;
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;
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; MapFlat - convert a 16:16 pointer into a 0:32 pointer
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;
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; note this function assumes the memory will *not* move
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; while being accessed. If this is not true call GlobalFix
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; on the memory
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;
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; INPUT:
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; ptr16 16:16 pointer to map flat.
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;
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; OUTPUT:
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; dx:ax flat pointer
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;
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;--------------------------------------------------------------------------;
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assumes ds,Data
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assumes es,nothing
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cProc MapFlat, <NEAR>
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ParmD ptr16
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cBegin
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mov ds,[flatSel]
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push word ptr ptr16[2]
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cCall GetSelectorBase
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add ax,word ptr ptr16[0]
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adc dx,0
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sub ax,word ptr flatBase[0]
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sbb dx,word ptr flatBase[2]
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cEnd
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sEnd
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end
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