xref: /src/sys/arch/arm/include/arm32/param.h

/*	$NetBSD: param.h,v 1.5 2001/08/07 22:26:56 bjh21 Exp $	*/

/*
 * Copyright (c) 1994,1995 Mark Brinicombe.
 * All rights reserved.
 *
 * 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 the RiscBSD team.
 * 4. The name "RiscBSD" 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 RISCBSD ``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 RISCBSD 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.
 */

#ifndef	_ARM_ARM32_PARAM_H_
#define	_ARM_ARM32_PARAM_H_

#ifdef _KERNEL
#  include <machine/cpu.h>
#endif

/*
 * Machine dependent constants for ARM6+ processors
 */
/* These are defined in the Port File before it includes
 * this file. */

#define	PGSHIFT		12		/* LOG2(NBPG) */
#define	NBPG		(1 << PGSHIFT)	/* bytes/page */
#define	PGOFSET		(NBPG-1)	/* byte offset into page */
#define	NPTEPG		(NBPG/(sizeof (pt_entry_t)))


#define SSIZE           1               /* initial stack size/NBPG */
#define SINCR           1               /* increment of stack/NBPG */
#define UPAGES          2               /* pages of u-area */
#define USPACE          (UPAGES * NBPG) /* total size of u-area */

#ifndef MSGBUFSIZE
#define MSGBUFSIZE	NBPG		/* default message buffer size */
#endif

#ifndef NMBCLUSTERS

#if defined(_KERNEL_OPT)
#include "opt_gateway.h"
#endif

#ifdef GATEWAY
#define	NMBCLUSTERS	512		/* map size, max cluster allocation */
#else
#define	NMBCLUSTERS	256		/* map size, max cluster allocation */
#endif
#endif

/*
 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
 * logical pages.
 */
#define	NKMEMPAGES_MIN_DEFAULT	((6 * 1024 * 1024) >> PAGE_SHIFT)
#define	NKMEMPAGES_MAX_DEFAULT	((7 * 1024 * 1024) >> PAGE_SHIFT)

/* Constants used to divide the USPACE area */

/*
 * The USPACE area contains :
 * 1. the user structure for the process
 * 2. the fp context for FP emulation
 * 3. the kernel (svc) stack
 * 4. the undefined instruction stack
 *
 * The layout of the area looks like this
 *
 * | user area | FP context | undefined stack | kernel stack |
 *
 * The size of the user area is known.
 * The size of the FP context is variable depending of the FP emulator
 * in use and whether there is hardware FP support. However we can put
 * an upper limit on it.
 * The undefined stack needs to be at least 512 bytes. This is a requirement
 * if the FP emulators
 * The kernel stack should be at least 4K is size.
 *
 * The stack top addresses are used to set the stack pointers. The stack bottom
 * addresses at the addresses monitored by the diagnostic code for stack overflows
 *
 */

#define FPCONTEXTSIZE			(0x100)
#define USPACE_SVC_STACK_TOP		(USPACE)
#define USPACE_SVC_STACK_BOTTOM		(USPACE_SVC_STACK_TOP - 0x1000)
#define	USPACE_UNDEF_STACK_TOP		(USPACE_SVC_STACK_BOTTOM - 0x10)
#define USPACE_UNDEF_STACK_BOTTOM	(sizeof(struct user) + FPCONTEXTSIZE + 10)

#define arm_byte_to_page(x) ((x) >> PGSHIFT)
#define arm_page_to_byte(x) ((x) << PGSHIFT)

#ifdef _KERNEL
#ifndef _LOCORE
void	delay __P((unsigned));
#define DELAY(x)	delay(x)
#endif
#endif

#include <arm/param.h>

#endif	/* _ARM_ARM32_PARAM_H_ */