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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: cpustate.h,v 1.6 2004/10/20 12:49:15 pefo Exp $ */

/*
 * Copyright (c) 2002-2003 Opsycon AB  (www.opsycon.se / www.opsycon.com)
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 */

#define	KERN_REG_SIZE		(NUMSAVEREGS * REGSZ)
#define	KERN_EXC_FRAME_SIZE	(CF_SZ + KERN_REG_SIZE + 16)

#define	SAVE_REG(reg, offs, base, bo) \
	REG_S	reg, bo + (REGSZ * offs) (base)

#define	RESTORE_REG(reg, offs, base, bo) \
	REG_L	reg, bo + (REGSZ * offs) (base)

/*
 *  This macro saves the 'scratch' cpu state on stack.
 *  Macros are generic so no 'special' instructions!
 *  a0 will have a pointer to the 'frame' on return.
 *  a1 will have saved STATUS_REG on return.
 *  a3 will have the exception pc on 'return'.
 *  No traps, no interrupts if frame = k1 or k0!
 *  Temp regs are saved with their register number so
 *  branch emulation etc works properly.
 */
#define	SAVE_CPU(frame, bo)			 \
	SAVE_REG(AT, AST, frame, bo)		;\
	SAVE_REG(v0, V0, frame, bo)		;\
	SAVE_REG(v1, V1, frame, bo)		;\
	SAVE_REG(a0, A0, frame, bo)		;\
	SAVE_REG(a1, A1, frame, bo)		;\
	SAVE_REG(a2, A2, frame, bo)		;\
	SAVE_REG(a3, A3, frame, bo)		;\
	SAVE_REG($8, T0, frame, bo)		;\
	SAVE_REG($9, T1, frame, bo)		;\
	SAVE_REG($10, T2, frame, bo)		;\
	SAVE_REG($11, T3, frame, bo)		;\
	SAVE_REG($12, T4, frame, bo)		;\
	SAVE_REG($13, T5, frame, bo)		;\
	SAVE_REG($14, T6, frame, bo)		;\
	SAVE_REG($15, T7, frame, bo)		;\
	SAVE_REG(t8, T8, frame, bo)		;\
	SAVE_REG(t9, T9, frame, bo)		;\
	SAVE_REG(gp, GP, frame, bo)		;\
	SAVE_REG(ra, RA, frame, bo)		;\
	mflo	v0				;\
	mfhi	v1				;\
	mfc0	a0, COP_0_CAUSE_REG		;\
	mfc0	a1, COP_0_STATUS_REG		;\
	dmfc0	a2, COP_0_BAD_VADDR		;\
	dmfc0	a3, COP_0_EXC_PC		;\
	SAVE_REG(v0, MULLO, frame, bo)		;\
	SAVE_REG(v1, MULHI, frame, bo)		;\
	SAVE_REG(a0, CAUSE, frame, bo)		;\
	SAVE_REG(a1, SR, frame, bo)		;\
	SAVE_REG(a2, BADVADDR, frame, bo)	;\
	SAVE_REG(a3, PC, frame, bo)		;\
	SAVE_REG(sp, SP, frame, bo)		;\
	PTR_ADDU a0, frame, bo			;\
	lw	a2, cpl				;\
	SAVE_REG(a2, CPL, frame, bo)

/*
 *  Save 'callee save' registers in frame to aid DDB.
 */
#define	SAVE_CPU_SREG(frame, bo)		 \
	SAVE_REG(s0, S0, frame, bo)		;\
	SAVE_REG(s1, S1, frame, bo)		;\
	SAVE_REG(s2, S2, frame, bo)		;\
	SAVE_REG(s3, S3, frame, bo)		;\
	SAVE_REG(s4, S4, frame, bo)		;\
	SAVE_REG(s5, S5, frame, bo)		;\
	SAVE_REG(s6, S6, frame, bo)		;\
	SAVE_REG(s7, S7, frame, bo)		;\
	SAVE_REG(s8, S8, frame, bo)

/*
 *  Restore cpu state. When called a0 = EXC_PC.
 */
#define	RESTORE_CPU(frame, bo)			 \
	RESTORE_REG(t1, SR, frame, bo)		;\
	RESTORE_REG(t2, MULLO, frame, bo)	;\
	RESTORE_REG(t3, MULHI, frame, bo)	;\
	mtc0	t1, COP_0_STATUS_REG		;\
	mtlo	t2				;\
	mthi	t3				;\
	dmtc0	a0, COP_0_EXC_PC		;\
	RESTORE_REG(AT, AST, frame, bo)		;\
	RESTORE_REG(v0, V0, frame, bo)		;\
	RESTORE_REG(v1, V1, frame, bo)		;\
	RESTORE_REG(a0, A0, frame, bo)		;\
	RESTORE_REG(a1, A1, frame, bo)		;\
	RESTORE_REG(a2, A2, frame, bo)		;\
	RESTORE_REG(a3, A3, frame, bo)		;\
	RESTORE_REG($8, T0, frame, bo)		;\
	RESTORE_REG($9, T1, frame, bo)		;\
	RESTORE_REG($10, T2, frame, bo)		;\
	RESTORE_REG($11, T3, frame, bo)		;\
	RESTORE_REG($12, T4, frame, bo)		;\
	RESTORE_REG($13, T5, frame, bo)		;\
	RESTORE_REG($14, T6, frame, bo)		;\
	RESTORE_REG($15, T7, frame, bo)		;\
	RESTORE_REG(t8, T8, frame, bo)		;\
	RESTORE_REG(t9, T9, frame, bo)		;\
	RESTORE_REG(gp, GP, frame, bo)		;\
	RESTORE_REG(ra, RA, frame, bo)

/*
 *  Restore 'callee save' registers
 */
#define	RESTORE_CPU_SREG(frame, bo)		 \
	RESTORE_REG(s0, S0, frame, bo)		;\
	RESTORE_REG(s1, S1, frame, bo)		;\
	RESTORE_REG(s2, S2, frame, bo)		;\
	RESTORE_REG(s3, S3, frame, bo)		;\
	RESTORE_REG(s4, S4, frame, bo)		;\
	RESTORE_REG(s5, S5, frame, bo)		;\
	RESTORE_REG(s6, S6, frame, bo)		;\
	RESTORE_REG(s7, S7, frame, bo)		;\
	RESTORE_REG(s8, S8, frame, bo)