1 /* $OpenBSD: param.h,v 1.16 2011/09/08 03:40:32 guenther Exp $ */ 2 /* $NetBSD: param.h,v 1.9 2002/03/24 03:37:23 thorpej Exp $ */ 3 4 /* 5 * Copyright (c) 1994,1995 Mark Brinicombe. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the RiscBSD team. 19 * 4. The name "RiscBSD" nor the name of the author may be used to 20 * endorse or promote products derived from this software without specific 21 * prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY RISCBSD ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL RISCBSD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef _ARM_PARAM_H_ 37 #define _ARM_PARAM_H_ 38 39 #define MACHINE_ARCH "arm" 40 #define _MACHINE_ARCH arm 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 PAGE_SHIFT 12 /* LOG2(NBPG) */ 49 #define PGSHIFT 12 /* LOG2(NBPG) */ 50 #define PAGE_SIZE (1 << PAGE_SHIFT) /* bytes/page */ 51 #define NBPG (1 << PAGE_SHIFT) /* bytes/page */ 52 #define PAGE_MASK (PAGE_SIZE - 1) 53 #define PGOFSET (PAGE_SIZE - 1) 54 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t))) 55 56 #define UPAGES 2 /* pages of u-area */ 57 #define USPACE (UPAGES * PAGE_SIZE) /* total size of u-area */ 58 #define USPACE_ALIGN (0) /* u-area alignment 0-none */ 59 60 #ifndef MSGBUFSIZE 61 #define MSGBUFSIZE PAGE_SIZE /* default message buffer size */ 62 #endif 63 64 /* 65 * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized 66 * logical pages. 67 */ 68 #define NKMEMPAGES_MIN_DEFAULT ((4 * 1024 * 1024) >> PAGE_SHIFT) 69 #define NKMEMPAGES_MAX_DEFAULT ((64 * 1024 * 1024) >> PAGE_SHIFT) 70 71 /* Constants used to divide the USPACE area */ 72 73 /* 74 * The USPACE area contains : 75 * 1. the user structure for the process 76 * 2. the fp context for FP emulation 77 * 3. the kernel (svc) stack 78 * 4. the undefined instruction stack 79 * 80 * The layout of the area looks like this 81 * 82 * | user area | FP context | undefined stack | kernel stack | 83 * 84 * The size of the user area is known. 85 * The size of the FP context is variable depending of the FP emulator 86 * in use and whether there is hardware FP support. However we can put 87 * an upper limit on it. 88 * The undefined stack needs to be at least 512 bytes. This is a requirement 89 * if the FP emulators 90 * The kernel stack should be at least 4K is size. 91 * 92 * The stack top addresses are used to set the stack pointers. The stack bottom 93 * addresses at the addresses monitored by the diagnostic code for stack overflows 94 * 95 */ 96 97 #define FPCONTEXTSIZE (0x100) 98 #define USPACE_SVC_STACK_TOP (USPACE) 99 #define USPACE_SVC_STACK_BOTTOM (USPACE_SVC_STACK_TOP - 0x1000) 100 #define USPACE_UNDEF_STACK_TOP (USPACE_SVC_STACK_BOTTOM - 0x10) 101 #define USPACE_UNDEF_STACK_BOTTOM (sizeof(struct user) + FPCONTEXTSIZE + 10) 102 103 #ifdef _KERNEL 104 #ifndef _LOCORE 105 void delay (unsigned); 106 #define DELAY(x) delay(x) 107 #endif 108 #endif 109 110 /* 111 * Machine dependent constants for all ARM processors 112 */ 113 114 /* 115 * For KERNEL code: 116 * MACHINE must be defined by the individual port. This is so that 117 * uname returns the correct thing, etc. 118 * 119 * MACHINE_ARCH may be defined by individual ports as a temporary 120 * measure while we're finishing the conversion to ELF. 121 * 122 * For non-KERNEL code: 123 * If ELF, MACHINE and MACHINE_ARCH are forced to "arm/armeb". 124 */ 125 126 127 #define MID_MACHINE MID_ARM6 128 129 #define ALIGNBYTES _ALIGNBYTES 130 #define ALIGN(p) _ALIGN(p) 131 #define ALIGNED_POINTER(p,t) _ALIGNED_POINTER(p,t) 132 133 /* ARM-specific macro to align a stack pointer (downwards). */ 134 #define STACKALIGNBYTES (8 - 1) 135 #define STACKALIGN(p) ((u_long)(p) &~ STACKALIGNBYTES) 136 137 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */ 138 #define DEV_BSIZE (1 << DEV_BSHIFT) 139 #define BLKDEV_IOSIZE 2048 140 141 #ifndef MAXPHYS 142 #define MAXPHYS (64 * 1024) /* max I/O transfer size */ 143 #endif 144 145 /* pages ("clicks") to disk blocks */ 146 #define ctod(x) ((x) << (PAGE_SHIFT - DEV_BSHIFT)) 147 #define dtoc(x) ((x) >> (PAGE_SHIFT - DEV_BSHIFT)) 148 149 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \ 150 ((bytes) >> DEV_BSHIFT) 151 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \ 152 ((db) << DEV_BSHIFT) 153 154 /* 155 * Constants related to network buffer management. 156 */ 157 #define NMBCLUSTERS 4096 /* map size, max cluster allocation */ 158 159 #define ovbcopy bcopy 160 161 #if defined(_KERNEL) && !defined(_LOCORE) 162 #include <sys/param.h> 163 #include <machine/cpu.h> 164 #endif 165 166 #endif /* _ARM_PARAM_H_ */ 167