Home | History | Annotate | Line # | Download | only in arm32
param.h revision 1.7 
      1 /*	$NetBSD: param.h,v 1.7 2002/02/22 06:41:48 briggs Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994,1995 Mark Brinicombe.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the RiscBSD team.
     18  * 4. The name "RiscBSD" nor the name of the author may be used to
     19  *    endorse or promote products derived from this software without specific
     20  *    prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY RISCBSD ``AS IS'' AND ANY EXPRESS OR IMPLIED
     23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL RISCBSD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     26  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     27  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     28  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #ifndef	_ARM_ARM32_PARAM_H_
     36 #define	_ARM_ARM32_PARAM_H_
     37 
     38 #ifdef _KERNEL
     39 #  include <machine/cpu.h>
     40 #endif
     41 
     42 /*
     43  * Machine dependent constants for ARM6+ processors
     44  */
     45 /* These are defined in the Port File before it includes
     46  * this file. */
     47 
     48 #define	PGSHIFT		12		/* LOG2(NBPG) */
     49 #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
     50 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     51 #define	NPTEPG		(NBPG/(sizeof (pt_entry_t)))
     52 
     53 
     54 #define SSIZE           1               /* initial stack size/NBPG */
     55 #define SINCR           1               /* increment of stack/NBPG */
     56 #define UPAGES          2               /* pages of u-area */
     57 #define USPACE          (UPAGES * NBPG) /* total size of u-area */
     58 
     59 #ifndef MSGBUFSIZE
     60 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     61 #endif
     62 
     63 #ifndef NMBCLUSTERS
     64 
     65 #if defined(_KERNEL_OPT)
     66 #include "opt_gateway.h"
     67 #endif
     68 
     69 #ifdef GATEWAY
     70 #define	NMBCLUSTERS	2048		/* map size, max cluster allocation */
     71 #else
     72 #define	NMBCLUSTERS	1024		/* map size, max cluster allocation */
     73 #endif
     74 #endif
     75 
     76 /*
     77  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
     78  * logical pages.
     79  */
     80 #define	NKMEMPAGES_MIN_DEFAULT	((6 * 1024 * 1024) >> PAGE_SHIFT)
     81 #define	NKMEMPAGES_MAX_DEFAULT	((7 * 1024 * 1024) >> PAGE_SHIFT)
     82 
     83 /* Constants used to divide the USPACE area */
     84 
     85 /*
     86  * The USPACE area contains :
     87  * 1. the user structure for the process
     88  * 2. the fp context for FP emulation
     89  * 3. the kernel (svc) stack
     90  * 4. the undefined instruction stack
     91  *
     92  * The layout of the area looks like this
     93  *
     94  * | user area | FP context | undefined stack | kernel stack |
     95  *
     96  * The size of the user area is known.
     97  * The size of the FP context is variable depending of the FP emulator
     98  * in use and whether there is hardware FP support. However we can put
     99  * an upper limit on it.
    100  * The undefined stack needs to be at least 512 bytes. This is a requirement
    101  * if the FP emulators
    102  * The kernel stack should be at least 4K is size.
    103  *
    104  * The stack top addresses are used to set the stack pointers. The stack bottom
    105  * addresses at the addresses monitored by the diagnostic code for stack overflows
    106  *
    107  */
    108 
    109 #define FPCONTEXTSIZE			(0x100)
    110 #define USPACE_SVC_STACK_TOP		(USPACE)
    111 #define USPACE_SVC_STACK_BOTTOM		(USPACE_SVC_STACK_TOP - 0x1000)
    112 #define	USPACE_UNDEF_STACK_TOP		(USPACE_SVC_STACK_BOTTOM - 0x10)
    113 #define USPACE_UNDEF_STACK_BOTTOM	(sizeof(struct user) + FPCONTEXTSIZE + 10)
    114 
    115 #define arm_byte_to_page(x) ((x) >> PGSHIFT)
    116 #define arm_page_to_byte(x) ((x) << PGSHIFT)
    117 #define arm_trunc_page(x)	((unsigned)(x) & ~PGOFSET)
    118 
    119 #ifdef _KERNEL
    120 #ifndef _LOCORE
    121 void	delay __P((unsigned));
    122 #define DELAY(x)	delay(x)
    123 #endif
    124 #endif
    125 
    126 #include <arm/param.h>
    127 
    128 #endif	/* _ARM_ARM32_PARAM_H_ */
    129