sys/arch/arm/include/arm32/param.h

   1 /*      $NetBSD: param.h,v 1.17 2012/02/04 17:56:16 para 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 /*
  64  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
  65  * logical pages.
  66  */
  67 #define NKMEMPAGES_MIN_DEFAULT  ((8 * 1024 * 1024) >> PAGE_SHIFT)
  68 #define NKMEMPAGES_MAX_DEFAULT  ((128 * 1024 * 1024) >> PAGE_SHIFT)
  69
  70 /* Constants used to divide the USPACE area */
  71
  72 /*
  73  * The USPACE area contains :
  74  * 1. the pcb structure for the process
  75  * 2. the fp context for FP emulation
  76  * 3. the kernel (svc) stack
  77  *
  78  * The layout of the area looks like this
  79  *
  80  * | uarea | FP context | kernel stack |
  81  *
  82  * The size of the uarea is known.
  83  * The size of the FP context is variable depending of the FP emulator
  84  * in use and whether there is hardware FP support. However we can put
  85  * an upper limit on it.
  86  * The kernel stack should be at least 4K is size.
  87  *
  88  * The stack top addresses are used to set the stack pointers. The stack bottom
  89  * addresses at the addresses monitored by the diagnostic code for stack overflows
  90  *
  91  */
  92
  93 #define FPCONTEXTSIZE                   (0x100)
  94 #define USPACE_SVC_STACK_TOP            (USPACE)
  95 #define USPACE_SVC_STACK_BOTTOM         (sizeof(struct pcb) + FPCONTEXTSIZE + 10)
  96
  97 #define arm_btop(x)                     ((x) >> PGSHIFT)
  98 #define arm_ptob(x)                     ((x) << PGSHIFT)
  99 #define arm_trunc_page(x)               ((unsigned)(x) & ~PGOFSET)
 100
 101 #ifdef _KERNEL
 102 #ifndef _LOCORE
 103 void    delay(unsigned);
 104 #define DELAY(x)        delay(x)
 105 #endif
 106 #endif
 107
 108 #include <arm/param.h>
 109
 110 #endif  /* _ARM_ARM32_PARAM_H_ */