File: [local] / sys / arch / arm / arm / setstack.S (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:05:10 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: setstack.S,v 1.2 2004/02/01 06:10:33 drahn Exp $ */
/* $NetBSD: setstack.S,v 1.2 2002/08/15 01:37:02 briggs Exp $ */
/*
* Copyright (c) 1994 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Brini.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BRINI ``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 BRINI 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.
*
* RiscBSD kernel project
*
* setstack.S
*
* Miscellaneous routine to play with the stack pointer in different CPU modes
*
* Eventually this routine can be inline assembly.
*
* Created : 17/09/94
*
* Based of kate/display/setstack.s
*/
#include <machine/cpu.h>
#include <machine/asm.h>
/* To set the stack pointer for a particular mode we must switch
* to that mode update the banked r13 and then switch back.
* This routine provides an easy way of doing this for any mode
*
* r0 = CPU mode
* r1 = stackptr
*/
ENTRY(set_stackptr)
mrs r3, cpsr /* Switch to the appropriate mode */
bic r2, r3, #(PSR_MODE)
orr r2, r2, r0
msr cpsr_all, r2
mov sp, r1 /* Set the stack pointer */
msr cpsr_all, r3 /* Restore the old mode */
mov pc, lr /* Exit */
/* To get the stack pointer for a particular mode we must switch
* to that mode copy the banked r13 and then switch back.
* This routine provides an easy way of doing this for any mode
*
* r0 = CPU mode
*/
ENTRY(get_stackptr)
mrs r3, cpsr /* Switch to the appropriate mode */
bic r2, r3, #(PSR_MODE)
orr r2, r2, r0
msr cpsr_all, r2
mov r0, sp /* Set the stack pointer */
msr cpsr_all, r3 /* Restore the old mode */
mov pc, lr /* Exit */
/* End of setstack.S */