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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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