154 lines
3.2 KiB
ArmAsm
154 lines
3.2 KiB
ArmAsm
/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/misc/BUSmemcpy.s,v 1.2 1998/07/25 16:56:49 dawes Exp $ */
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/******************************************************************************
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Copyright 1993 by Glenn G. Lai
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Glenn G. Lai not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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Glenn G. Lai DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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Glenn G. Lai
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P.O. Box 4314
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Austin, Tx 78765
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(glenn@cs.utexas.edu)
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8/9/93
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******************************************************************************/
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/* $XConsortium: BUSmemcpy.s /main/4 1996/02/21 17:39:34 kaleb $ */
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/*
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* Modified to use long-alignment of video memory rather than word-alignment
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* to improve performance for LocalBus video cards. Function names changed
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* from ISAToMem and MemToISA to BusToMem and MemToBus.
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*
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* David Dawes <dawes@XFree86.org>, 25 August 1993.
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*/
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#include "assyntax.h"
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FILE("BUSmemcpy.s")
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AS_BEGIN
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/* BusToMem copies from video memory to main memory
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MemToBus copies from main memory to video memory
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void xf86BusToMem(unsigned char *dst, unsigned char *src, int len);
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void xf86MemToBus(unsigned char *dst, unsigned char *src, int len);
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*/
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#define dst REGOFF(4,ESP)
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#define src REGOFF(8,ESP)
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#define len REGOFF(12,ESP)
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GLOBL GLNAME(xf86BusToMem)
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GLOBL GLNAME(xf86MemToBus)
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SEG_DATA
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copyright:
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STRING("Copyright 8/9/1993 by Glenn G. Lai")
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SEG_TEXT
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ALIGNTEXT4
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GLNAME(xf86BusToMem):
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CLD
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PUSH_L (ESI)
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MOV_L (EDI, EDX)
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MOV_L (src, ESI)
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MOV_L (dst, EDI)
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MOV_L (len, ECX)
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CMP_L (CONST(7), ECX)
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JC (quickBM)
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TEST_L (CONST(1), ESI)
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JZ (BwM)
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MOVS_B
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DEC_L (ECX)
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BwM:
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TEST_L (CONST(2), ESI)
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JZ (BlM)
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MOVS_W
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DEC_L (ECX)
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DEC_L (ECX)
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BlM:
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MOV_L (ECX, EAX)
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AND_L (CONST(3), EAX)
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SHR_L (CONST(2), ECX)
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REP
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MOVS_L
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MOV_L (EAX, ECX)
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quickBM:
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OR_L (ECX, ECX)
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JZ (return)
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REP
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MOVS_B
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return:
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POP_L (ESI)
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MOV_L (EDX, EDI)
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RET
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/************************/
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ALIGNTEXT4
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GLNAME(xf86MemToBus):
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CLD
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PUSH_L (ESI)
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MOV_L (EDI, EDX)
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MOV_L (src, ESI)
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MOV_L (dst, EDI)
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MOV_L (len, ECX)
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CMP_L (CONST(7), ECX)
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JC (quickMB)
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TEST_L (CONST(1), EDI)
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JZ (MwB)
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MOVS_B
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DEC_L (ECX)
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MwB:
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TEST_L (CONST(2), EDI)
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JZ (MlB)
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MOVS_W
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DEC_L (ECX)
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DEC_L (ECX)
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MlB:
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MOV_L (ECX, EAX)
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AND_L (CONST(3), EAX)
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SHR_L (CONST(2), ECX)
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REP
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MOVS_L
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MOV_L (EAX, ECX)
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quickMB:
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OR_L (ECX, ECX)
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JZ (return)
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REP
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MOVS_B
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POP_L (ESI)
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MOV_L (EDX, EDI)
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RET
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