277 lines
4 KiB
NASM
277 lines
4 KiB
NASM
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title HMem
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;HMem.asm - huge memory functions HMemCpy, etc
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include gpfix.inc
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include kernel.inc
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externFP Int21Handler
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DataBegin
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externW WinFlags
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ifdef WOW
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externD pFileTable
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externW cur_dos_PDB
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externW Win_PDB
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endif
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DataEnd
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ifdef WOW
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externFP WOWFileRead
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externFP WOWFileWrite
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endif
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sBegin CODE
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assumes cs,CODE
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ifdef WOW
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externD prevInt21proc
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endif
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externA __AHINCR
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cProc hMemCpy,<PUBLIC,FAR>,<ds, si, di>
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parmD dest ; to ES:DI
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parmD src ; to DS:SI
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parmD cnt ; to DX:AX
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localW flags
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cBegin
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SetKernelDS
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mov bx, WinFlags
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mov flags, bx
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mov dx, seg_cnt ; DX:AX is 32 bit length
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mov ax, off_cnt
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xor cx, cx ; 0 if fault loading operands
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beg_fault_trap hmc_trap
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lds si, src
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les di, dest
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cld
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hmc_loop:
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mov cx, 8000h ; try to copy 32K
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cmp cx, si ; space left in source?
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jae @F
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mov cx, si
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@@: cmp cx, di ; space left in dest?
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jae @F
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mov cx, di
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@@: neg cx ; convert bytes left to positive
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or dx, dx ; >64K left to copy?
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jnz @F
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cmp cx, ax ; At least this much left?
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jbe @F
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mov cx, ax
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@@: sub ax, cx ; Decrement count while we're here
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sbb dx, 0
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test flags, WF_CPU386 + WF_CPU486 + WF_ENHANCED
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jnz hmc_do32
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shr cx, 1 ; Copy 32KB
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rep movsw
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adc cx, 0
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rep movsb
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jmps hmc_copied
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hmc_do32:
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.386p
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push cx
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shr cx, 2
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rep movsd
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pop cx
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and cx, 3
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rep movsb
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.286p
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hmc_copied:
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mov cx, ax ; At end of copy?
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or cx, dx
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jz hmc_done
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or si, si ; Source wrap-around?
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jnz @F
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mov bx, ds
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add bx, __AHINCR
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mov ds, bx
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@@: or di, di ; Dest wrap-around?
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jnz @F
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mov bx, es
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add bx, __AHINCR
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mov es, bx
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end_fault_trap
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@@: jmps hmc_loop
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hmc_trap:
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fault_fix_stack ; DX:AX = bytes left if failure
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krDebugOut DEB_ERROR, "hMemCopy: Copy past end of segment"
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add ax, cx
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adc dx, 0
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hmc_done: ; DX:AX = 0 if success
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cEnd
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ifdef W_Q21
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cProc _HREAD, <PUBLIC, FAR, NODATA>, <ds>
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parmW h
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parmD lpData
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parmD dwCnt
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cBegin
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SetKernelDS ds
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push bx
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mov bx, Win_PDB
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cmp bx, cur_dos_PDB
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je HR_PDB_ok
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push ax
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mov cur_dos_PDB,bx
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mov ah,50h
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pushf
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call cs:prevInt21Proc ; JUMP THROUGH CS VARIABLE
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pop ax
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HR_PDB_OK:
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pop bx
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cCall WowFileRead,<h,lpData,dwCnt,cur_dos_PDB,0,pFileTable>
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; DX:AX = Number Bytes Read
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; DX = FFFF, AX = Error Code
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inc dx
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jnz @f
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xor dx,dx
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or ax, -1
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@@:
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dec dx
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cEnd
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cProc _HWRITE, <PUBLIC, FAR, NODATA>, <ds>
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parmW h
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parmD lpData
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parmD dwCnt
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cBegin
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SetKernelDS ds
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push bx ; Setting the DOS PDB can probably
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mov bx, Win_PDB ; be removed just pass Win_PDB to
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cmp bx, cur_dos_PDB ; the WOW thunk
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je HW_PDB_ok
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push ax
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mov cur_dos_PDB,bx
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mov ah,50h
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pushf
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call cs:prevInt21Proc ; JUMP THROUGH CS VARIABLE
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pop ax
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HW_PDB_OK:
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pop bx
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cCall WowFileWrite,<h,lpData,dwCnt,cur_dos_PDB,0,pFileTable>
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; DX:AX = Number Bytes Read
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; DX = FFFF, AX = Error Code
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inc dx
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jnz @f
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xor dx,dx
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or ax, -1
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@@:
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dec dx
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cEnd
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else
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public _HREAD, _HWRITE
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_HREAD:
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mov bx, 3f00h
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jmps hugeIO
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_HWRITE:
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mov bx, 4000h
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cProc hugeIO, <FAR, NODATA>, <ds, si, di, cx>
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parmW h
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parmD lpData
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parmD dwCnt
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localD dwTot
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localW func
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cBegin
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mov func, bx ; read from a file
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mov bx, h
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xor cx, cx
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mov seg_dwTot, cx
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mov off_dwTot, cx
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beg_fault_trap hr_fault
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lds dx, lpData
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mov si, seg_dwCnt
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mov di, off_dwCnt
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hr_loop:
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mov cx, 8000h ; try to do 32KB
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cmp cx, dx ; space left in data buffer
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jae @F
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mov cx, dx
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neg cx
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@@: or si, si ; at least 64K left
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jnz @F
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cmp cx, di
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jbe @F
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mov cx, di
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@@: mov ax, func ; talk to DOS
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DOSCALL
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jc hr_oops
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add off_dwTot, ax ; update transfer count
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adc seg_dwTot, 0
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cmp ax, cx ; end of file?
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jnz hr_done
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sub di, ax ; decrement count
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sbb si, 0
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mov cx, si ; end of count
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or cx, di
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jz hr_done
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add dx, ax ; update pointer to data
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jnz @F ; wrapped to next segment
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mov ax, ds
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add ax, __AHINCR
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mov ds, ax
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end_fault_trap
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@@: jmps hr_loop
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hr_fault:
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pop dx
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pop ax
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; krDebugOut DEB_ERROR, "File I/O past end of memory block"
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krDebugOut DEB_ERROR, "GP fault in _hread/_hwrite at #DX #AX"
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; fault_fix_stack
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hr_oops:
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or dx, -1
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mov seg_dwTot, dx
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mov off_dwTot, dx
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hr_done:
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mov dx, seg_dwTot
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mov ax, off_dwTot
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cEnd
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endif ; WOW
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sEnd
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end
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