diff options
Diffstat (limited to 'hw/xfree86/os-support/misc/BUSmemcpy.S')
| -rw-r--r-- | hw/xfree86/os-support/misc/BUSmemcpy.S | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/hw/xfree86/os-support/misc/BUSmemcpy.S b/hw/xfree86/os-support/misc/BUSmemcpy.S new file mode 100644 index 000000000..e4ff36c62 --- /dev/null +++ b/hw/xfree86/os-support/misc/BUSmemcpy.S @@ -0,0 +1,156 @@ +/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/misc/BUSmemcpy.S,v 1.1 1999/07/10 07:24:49 dawes Exp $ */ +/****************************************************************************** + Copyright 1993 by Glenn G. Lai + + All Rights Reserved + +Permission to use, copy, modify, and distribute this software and its +documentation for any purpose and without fee is hereby granted, +provided that the above copyright notice appear in all copies and that +both that copyright notice and this permission notice appear in +supporting documentation, and that the name of Glenn G. Lai not be +used in advertising or publicity pertaining to distribution of the +software without specific, written prior permission. + +Glenn G. Lai DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING +ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL +DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR +ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, +WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, +ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS +SOFTWARE. + +Glenn G. Lai +P.O. Box 4314 +Austin, Tx 78765 +(glenn@cs.utexas.edu) +8/9/93 +******************************************************************************/ +/* $XConsortium: BUSmemcpy.s /main/4 1996/02/21 17:39:34 kaleb $ */ + +/* + * Modified to use long-alignment of video memory rather than word-alignment + * to improve performance for LocalBus video cards. Function names changed + * from ISAToMem and MemToISA to BusToMem and MemToBus. + * + * David Dawes <dawes@XFree86.org>, 25 August 1993. + */ + + +#include "assyntax.h" + + FILE("BUSmemcpy.s") + + AS_BEGIN + +/* BusToMem copies from video memory to main memory + MemToBus copies from main memory to video memory + + void xf86BusToMem(unsigned char *dst, unsigned char *src, int len); + void xf86MemToBus(unsigned char *dst, unsigned char *src, int len); +*/ + +#define dst REGOFF(4,ESP) +#define src REGOFF(8,ESP) +#define len REGOFF(12,ESP) + + GLOBL GLNAME(xf86BusToMem) + GLOBL GLNAME(xf86MemToBus) + + SEG_DATA +copyright: + STRING("Copyright 8/9/1993 by Glenn G. Lai") + + ALIGNDATA4 +tmp: D_LONG 0 + + SEG_TEXT + ALIGNTEXT4 +GLNAME(xf86BusToMem): + CLD + MOV_L (ESI, CONTENT(tmp)) + MOV_L (EDI, EDX) + + MOV_L (src, ESI) + MOV_L (dst, EDI) + MOV_L (len, ECX) + + CMP_L (CONST(7), ECX) + JC (quickBM) + + TEST_L (CONST(1), ESI) + JZ (BwM) + + MOVS_B + DEC_L (ECX) + +BwM: + TEST_L (CONST(2), ESI) + JZ (BlM) + + MOVS_W + DEC_L (ECX) + DEC_L (ECX) + +BlM: + MOV_L (ECX, EAX) + AND_L (CONST(3), EAX) + SHR_L (CONST(2), ECX) + REP + MOVS_L + MOV_L (EAX, ECX) +quickBM: + OR_L (ECX, ECX) + JZ (return) + REP + MOVS_B +return: + MOV_L (CONTENT(tmp), ESI) + MOV_L (EDX, EDI) + RET +/************************/ + + ALIGNTEXT4 +GLNAME(xf86MemToBus): + CLD + MOV_L (ESI, CONTENT(tmp)) + MOV_L (EDI, EDX) + + MOV_L (src, ESI) + MOV_L (dst, EDI) + MOV_L (len, ECX) + + CMP_L (CONST(7), ECX) + JC (quickMB) + + TEST_L (CONST(1), EDI) + JZ (MwB) + + MOVS_B + DEC_L (ECX) + +MwB: + TEST_L (CONST(2), EDI) + JZ (MlB) + + MOVS_W + DEC_L (ECX) + DEC_L (ECX) + +MlB: + MOV_L (ECX, EAX) + AND_L (CONST(3), EAX) + SHR_L (CONST(2), ECX) + REP + MOVS_L + MOV_L (EAX, ECX) +quickMB: + OR_L (ECX, ECX) + JZ (return) + REP + MOVS_B + + MOV_L (CONTENT(tmp), ESI) + MOV_L (EDX, EDI) + RET + |