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Annotation of XNU/bsd/ppc/param.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* Copyright (c) 1993,1995 NeXT Computer, Inc. All Rights Reserved */
        !            23: /*
        !            24:  * The NEXTSTEP Software License Agreement specifies the terms
        !            25:  * and conditions for redistribution.
        !            26:  *
        !            27:  */
        !            28: 
        !            29: #ifndef        _PPC_PARAM_H_
        !            30: #define        _PPC_PARAM_H_
        !            31: 
        !            32: /*
        !            33:  * Round p (pointer or byte index) up to a correctly-aligned value for all
        !            34:  * data types (int, long, ...).   The result is u_int and must be cast to
        !            35:  * any desired pointer type.
        !            36:  */
        !            37: #define        ALIGNBYTES      3
        !            38: #define        ALIGN(p)        (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
        !            39: 
        !            40: #define        NBPG            4096            /* bytes/page */
        !            41: #define        PGOFSET         (NBPG-1)        /* byte offset into page */
        !            42: #define        PGSHIFT         12              /* LOG2(NBPG) */
        !            43: 
        !            44: #define NBSEG          0x40000000      /* bytes/segment (quadrant) */
        !            45: #define        SEGOFSET        (NBSEG-1)       /* byte offset into segment */
        !            46: #define        SEGSHIFT        30              /* LOG2(NBSEG) */
        !            47: 
        !            48: #define        DEV_BSIZE       512
        !            49: #define        DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
        !            50: #define BLKDEV_IOSIZE  2048
        !            51: #define        MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
        !            52: 
        !            53: #define        STACK_GROWTH_UP 0               /* stack grows to lower addresses */
        !            54: 
        !            55: #define        CLSIZE          1
        !            56: #define        CLSIZELOG2      0
        !            57: 
        !            58: #define STACKSIZE 4                    /* pages in kernel stack */
        !            59: #define        UPAGES  (USIZE+STACKSIZE)       /* total pages in u-area */
        !            60:                                        /* red zone is beyond this */
        !            61: 
        !            62: /*
        !            63:  * Constants related to network buffer management.
        !            64:  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
        !            65:  * on machines that exchange pages of input or output buffers with mbuf
        !            66:  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
        !            67:  * of the hardware page size.
        !            68:  */
        !            69: #define        MSIZE           256             /* size of an mbuf */
        !            70: #define        MCLBYTES        2048            /* large enough for ether MTU */
        !            71: #define        MCLSHIFT        11
        !            72: #define        MCLOFSET        (MCLBYTES - 1)
        !            73: #ifndef NMBCLUSTERS
        !            74: #if GATEWAY
        !            75: #define        NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      /* cl map size: 1MB */
        !            76: #else
        !            77: #define        NMBCLUSTERS     ((1024 * 1024) / MCLBYTES)      
        !            78:                /* cl map size was  0.5MB when MSIZE was 128, now it's 1MB*/
        !            79: #endif
        !            80: #endif
        !            81: 
        !            82: /* pages ("clicks") (NBPG bytes) to disk blocks */
        !            83: #define        ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
        !            84: #define        dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
        !            85: #define        dtob(x) ((x)<<DEV_BSHIFT)
        !            86: 
        !            87: /* pages to bytes */
        !            88: #define        ctob(x) ((x)<<PGSHIFT)
        !            89: 
        !            90: /* bytes to pages */
        !            91: #define        btoc(x) (((unsigned)(x)+(PGOFSET))>>PGSHIFT)
        !            92: #ifdef __APPLE__
        !            93: #define  btodb(bytes, devBlockSize)         \
        !            94:         ((unsigned)(bytes) / devBlockSize)
        !            95: #define  dbtob(db, devBlockSize)            \
        !            96:              ((unsigned)(db) * devBlockSize)
        !            97: #else
        !            98: #define        btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
        !            99:        ((unsigned)(bytes) >> DEV_BSHIFT)
        !           100: #define        dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
        !           101:        ((unsigned)(db) << DEV_BSHIFT)
        !           102: #endif
        !           103: 
        !           104: /*
        !           105:  * Map a ``block device block'' to a file system block.
        !           106:  * This should be device dependent, and should use the bsize
        !           107:  * field from the disk label.
        !           108:  * For now though just use DEV_BSIZE.
        !           109:  */
        !           110: #define        bdbtofsb(bn)    ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
        !           111: 
        !           112: /* from machdep/ppc/proc_reg.h */
        !           113: #if __BIG_ENDIAN__
        !           114: #define ENDIAN_MASK(val,size) (1 << (size-1 - val))
        !           115: #else
        !           116: #error code not ported to little endian targets yet
        !           117: #endif /* __BIG_ENDIAN__ */
        !           118: 
        !           119: #ifndef MASK
        !           120: #define MASK(PART)     ENDIAN_MASK(PART ## _BIT, 32)
        !           121: #endif
        !           122: 
        !           123: #define        MSR_EE_BIT      16
        !           124: #define        MSR_PR_BIT      17
        !           125: #define USERMODE(msr) (msr & MASK(MSR_PR) ? TRUE : FALSE)
        !           126: #define BASEPRI(msr) (msr & MASK(MSR_EE) ? TRUE : FALSE)
        !           127: /* end of from proc_reg.h */
        !           128: 
        !           129: #if    defined(KERNEL) || defined(STANDALONE)
        !           130: #define        DELAY(n) delay(n)
        !           131: #else
        !           132: #define        DELAY(n)        { register int N = (n); while (--N > 0); }
        !           133: #endif /* defined(KERNEL) || defined(STANDALONE) */
        !           134: 
        !           135: #define        NPIDS           16      /* maximum number of PIDs per process */
        !           136: #define        NIOPIDS         8       /* maximum number of IO space PIDs */
        !           137: 
        !           138: #endif /* _PPC_PARAM_H_ */

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