File: [local] / sys / arch / m68k / m68k / bcopy.s (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:06:29 2008 UTC (16 years, 3 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
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/* $OpenBSD: bcopy.s,v 1.2 2003/06/02 23:27:48 millert Exp $ */
/* $NetBSD: bcopy.s,v 1.1 1997/03/17 19:44:33 gwr Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* This is based on: src/lib/libc/arch/m68k/string/bcopy.S
* identified as: @(#)bcopy.s 5.1 (Berkeley) 5/12/90
*/
#include <machine/asm.h>
.file "bcopy.s"
.text
/*
* {ov}bcopy(from, to, len)
* memcpy(to, from, len)
*
* Works for counts up to 128K.
*/
ALTENTRY(memmove, _memcpy)
ENTRY(memcpy)
movl sp@(12),d0 | get count
jeq Lbccpyexit | if zero, return
movl sp@(8), a0 | src address
movl sp@(4), a1 | dest address
jra Lbcdocopy | jump into bcopy
ALTENTRY(ovbcopy, _bcopy)
ENTRY(bcopy)
movl sp@(12),d0 | get count
jeq Lbccpyexit | if zero, return
movl sp@(4),a0 | src address
movl sp@(8),a1 | dest address
Lbcdocopy:
cmpl a1,a0 | src before dest?
jlt Lbccpyback | yes, copy backwards (avoids overlap)
movl a0,d1
btst #0,d1 | src address odd?
jeq Lbccfeven | no, go check dest
movb a0@+,a1@+ | yes, copy a byte
subql #1,d0 | update count
jeq Lbccpyexit | exit if done
Lbccfeven:
movl a1,d1
btst #0,d1 | dest address odd?
jne Lbccfbyte | yes, must copy by bytes
movl d0,d1 | no, get count
lsrl #2,d1 | convert to longwords
jeq Lbccfbyte | no longwords, copy bytes
subql #1,d1 | set up for dbf
Lbccflloop:
movl a0@+,a1@+ | copy longwords
dbf d1,Lbccflloop | til done
andl #3,d0 | get remaining count
jeq Lbccpyexit | done if none
Lbccfbyte:
subql #1,d0 | set up for dbf
Lbccfbloop:
movb a0@+,a1@+ | copy bytes
dbf d0,Lbccfbloop | til done
Lbccpyexit:
rts
Lbccpyback:
addl d0,a0 | add count to src
addl d0,a1 | add count to dest
movl a0,d1
btst #0,d1 | src address odd?
jeq Lbccbeven | no, go check dest
movb a0@-,a1@- | yes, copy a byte
subql #1,d0 | update count
jeq Lbccpyexit | exit if done
Lbccbeven:
movl a1,d1
btst #0,d1 | dest address odd?
jne Lbccbbyte | yes, must copy by bytes
movl d0,d1 | no, get count
lsrl #2,d1 | convert to longwords
jeq Lbccbbyte | no longwords, copy bytes
subql #1,d1 | set up for dbf
Lbccblloop:
movl a0@-,a1@- | copy longwords
dbf d1,Lbccblloop | til done
andl #3,d0 | get remaining count
jeq Lbccpyexit | done if none
Lbccbbyte:
subql #1,d0 | set up for dbf
Lbccbbloop:
movb a0@-,a1@- | copy bytes
dbf d0,Lbccbbloop | til done
rts