Annotation of sys/arch/sh/include/param.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: param.h,v 1.4 2007/05/28 21:02:49 thib Exp $ */
! 2: /* $NetBSD: param.h,v 1.15 2006/08/28 13:43:35 yamt Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 2002 The NetBSD Foundation, Inc. All rights reserved.
! 6: * Copyright (c) 1990 The Regents of the University of California.
! 7: * All rights reserved.
! 8: *
! 9: * This code is derived from software contributed to Berkeley by
! 10: * William Jolitz.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. Neither the name of the University nor the names of its contributors
! 21: * may be used to endorse or promote products derived from this software
! 22: * without specific prior written permission.
! 23: *
! 24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 34: * SUCH DAMAGE.
! 35: *
! 36: * @(#)param.h 5.8 (Berkeley) 6/28/91
! 37: */
! 38:
! 39: /*
! 40: * SuperH dependent constants.
! 41: */
! 42:
! 43: #ifndef _SH_PARAM_H_
! 44: #define _SH_PARAM_H_
! 45:
! 46: #define _MACHINE_ARCH sh
! 47: #define MACHINE_ARCH "sh"
! 48:
! 49: #ifndef MID_MACHINE
! 50: #define MID_MACHINE MID_SH3
! 51: #endif
! 52:
! 53: #if defined(_KERNEL) && !defined(_LOCORE)
! 54: #include <sh/cpu.h>
! 55: #endif
! 56:
! 57: /*
! 58: * We use 4K pages on the sh3/sh4. Override the PAGE_* definitions
! 59: * to be compile-time constants.
! 60: */
! 61: #define PAGE_SHIFT 12
! 62: #define PAGE_SIZE (1 << PAGE_SHIFT)
! 63: #define PAGE_MASK (PAGE_SIZE - 1)
! 64:
! 65: #define PGSHIFT PAGE_SHIFT
! 66: #define NBPG PAGE_SIZE
! 67: #define PGOFSET PAGE_MASK
! 68:
! 69: /*
! 70: * Round p (pointer or byte index) up to a correctly-aligned value
! 71: * for all data types (int, long, ...). The result is u_int and
! 72: * must be cast to any desired pointer type.
! 73: *
! 74: * ALIGNED_POINTER is a boolean macro that checks whether an address
! 75: * is valid to fetch data elements of type t from on this architecture.
! 76: * This does not reflect the optimal alignment, just the possibility
! 77: * (within reasonable limits).
! 78: *
! 79: */
! 80: #define ALIGNBYTES (sizeof(int) - 1)
! 81: #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
! 82: #define ALIGNED_POINTER(p, t) ((((u_long)(p)) & (sizeof(t) - 1)) == 0)
! 83:
! 84: #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
! 85: #define DEV_BSIZE (1 << DEV_BSHIFT)
! 86: #define BLKDEV_IOSIZE 2048
! 87: #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
! 88:
! 89: /*
! 90: * u-space.
! 91: */
! 92: #define UPAGES 3 /* pages of u-area */
! 93: #define USPACE (UPAGES * NBPG) /* total size of u-area */
! 94: #define USPACE_ALIGN (0)
! 95: #if UPAGES == 1
! 96: #error "too small u-area"
! 97: #elif UPAGES == 2
! 98: #define P1_STACK /* kernel stack is P1-area */
! 99: #else
! 100: #undef P1_STACK /* kernel stack is P3-area */
! 101: #endif
! 102:
! 103: #ifndef MSGBUFSIZE
! 104: #define MSGBUFSIZE NBPG /* default message buffer size */
! 105: #endif
! 106:
! 107: /* pages to bytes */
! 108: #define btoc(x) (((x) + PAGE_MASK) >> PAGE_SHIFT)
! 109: #define ctob(x) ((x) << PAGE_SHIFT)
! 110:
! 111: /* pages to disk blocks */
! 112: #define ctod(x) ((x) << (PAGE_SHIFT - DEV_BSHIFT))
! 113: #define dtoc(x) ((x) >> (PAGE_SHIFT - DEV_BSHIFT))
! 114:
! 115: /* bytes to disk blocks */
! 116: #define btodb(x) ((x) >> DEV_BSHIFT)
! 117: #define dbtob(x) ((x) << DEV_BSHIFT)
! 118:
! 119: /*
! 120: * Constants related to network buffer management.
! 121: */
! 122: #define NMBCLUSTERS 4096 /* map size, max cluster allocation */
! 123:
! 124: /*
! 125: * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
! 126: * logical pages.
! 127: */
! 128: #define NKMEMPAGES_MIN_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT)
! 129: #define NKMEMPAGES_MAX_DEFAULT ((64 * 1024 * 1024) >> PAGE_SHIFT)
! 130:
! 131: #endif /* !_SH3_PARAM_H_ */
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