Return to setstack.S CVS log

Up to [local] / sys / arch / arm / arm

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)

/*	$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 */