Annotation of sys/arch/arm/include/param.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: param.h,v 1.11 2007/05/28 21:02:49 thib 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: /*
! 130: * Round p (pointer or byte index) up to a correctly-aligned value
! 131: * for all data types (int, long, ...). The result is u_int and
! 132: * must be cast to any desired pointer type.
! 133: *
! 134: * ALIGNED_POINTER is a boolean macro that checks whether an address
! 135: * is valid to fetch data elements of type t from on this architecture.
! 136: * This does not reflect the optimal alignment, just the possibility
! 137: * (within reasonable limits).
! 138: *
! 139: */
! 140: #define ALIGNBYTES (sizeof(int) - 1)
! 141: #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
! 142: #define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0)
! 143: /* ARM-specific macro to align a stack pointer (downwards). */
! 144: #define STACKALIGNBYTES (8 - 1)
! 145: #define STACKALIGN(p) ((u_int)(p) &~ STACKALIGNBYTES)
! 146:
! 147: #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
! 148: #define DEV_BSIZE (1 << DEV_BSHIFT)
! 149: #define BLKDEV_IOSIZE 2048
! 150:
! 151: #ifndef MAXPHYS
! 152: #define MAXPHYS 65536 /* max I/O transfer size */
! 153: #endif
! 154:
! 155: /* pages ("clicks") to disk blocks */
! 156: #define ctod(x) ((x) << (PAGE_SHIFT - DEV_BSHIFT))
! 157: #define dtoc(x) ((x) >> (PAGE_SHIFT - DEV_BSHIFT))
! 158: /*#define dtob(x) ((x) << DEV_BSHIFT)*/
! 159:
! 160: #define ctob(x) ((x) << PAGE_SHIFT)
! 161:
! 162: /* bytes to pages */
! 163: #define btoc(x) (((x) + PAGE_MASK) >> PAGE_SHIFT)
! 164:
! 165: #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
! 166: ((bytes) >> DEV_BSHIFT)
! 167: #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
! 168: ((db) << DEV_BSHIFT)
! 169:
! 170: /*
! 171: * Constants related to network buffer management.
! 172: */
! 173: #define NMBCLUSTERS 4096 /* map size, max cluster allocation */
! 174:
! 175: #define ovbcopy bcopy
! 176:
! 177: #ifdef _KERNEL
! 178: #ifdef _LOCORE
! 179: #include <machine/psl.h>
! 180: #else
! 181: #include <sys/param.h>
! 182: #include <machine/cpu.h>
! 183: #endif
! 184: #endif
! 185:
! 186: #endif /* _ARM_PARAM_H_ */
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