aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.S
diff options
context:
space:
mode:
Diffstat (limited to 'xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.S')
-rw-r--r--xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.S153
1 files changed, 153 insertions, 0 deletions
diff --git a/xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.S b/xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.S
new file mode 100644
index 000000000..373723c7d
--- /dev/null
+++ b/xorg-server/hw/xfree86/os-support/misc/BUSmemcpy.S
@@ -0,0 +1,153 @@
+/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/misc/BUSmemcpy.s,v 1.2 1998/07/25 16:56:49 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")
+
+ SEG_TEXT
+ ALIGNTEXT4
+GLNAME(xf86BusToMem):
+ CLD
+ PUSH_L (ESI)
+ 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:
+ POP_L (ESI)
+ MOV_L (EDX, EDI)
+ RET
+/************************/
+
+ ALIGNTEXT4
+GLNAME(xf86MemToBus):
+ CLD
+ PUSH_L (ESI)
+ 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
+
+ POP_L (ESI)
+ MOV_L (EDX, EDI)
+ RET
+