File: [local] / sys / lib / libkern / arch / mips64 / bzero.S (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:15:13 2008 UTC (16 years, 6 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: bzero.S,v 1.6 2004/10/08 14:42:09 pefo Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* 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.
*/
#include "DEFS.h"
/*
* bzero(void *p, size_t len)
*/
LEAF(bzero, 0)
ALEAF(blkclr)
.set noreorder
#ifdef _STANDALONE
blt a1, 12, smallclr # small amount to clear?
PTR_SUBU a3, zero, a0 # compute # bytes to word align address
and a3, a3, 3
beq a3, zero, 1f # skip if word aligned
PTR_SUBU a1, a1, a3 # subtract from remaining count
SWHI zero, 0(a0) # clear 1, 2, or 3 bytes to align
PTR_ADDU a0, a0, a3
1:
and v0, a1, 3 # compute number of words left
PTR_SUBU a3, a1, v0
move a1, v0
PTR_ADDU a3, a3, a0 # compute ending address
2:
PTR_ADDU a0, a0, 4 # clear words
bne a0, a3, 2b # unrolling loop does not help
sw zero, -4(a0) # since we are limited by memory speed
#else
blt a1, 24, smallclr # small amount to clear?
PTR_SUBU a3, zero, a0 # compute # bytes to word align address
and a3, a3, 7
beq a3, zero, 1f # skip if word aligned
PTR_SUBU a1, a1, a3 # subtract from remaining count
SDHI zero, 0(a0) # clear 1, 2, or 3 bytes to align
PTR_ADDU a0, a0, a3
1:
and v0, a1, 7 # compute number of words left
PTR_SUBU a3, a1, v0
move a1, v0
PTR_ADDU a3, a3, a0 # compute ending address
2:
PTR_ADDU a0, a0, 8 # clear words
bne a0, a3, 2b # unrolling loop does not help
sd zero, -8(a0) # since we are limited by memory speed
#endif
smallclr:
ble a1, zero, 2f
PTR_ADDU a3, a1, a0 # compute ending address
1:
PTR_ADDU a0, a0, 1 # clear bytes
bne a0, a3, 1b
sb zero, -1(a0)
2:
j ra
nop
END(bzero)