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Annotation of sys/arch/m88k/include/mmu.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: mmu.h,v 1.8 2006/05/21 20:55:43 miod Exp $ */
        !             2:
        !             3: /*
        !             4:  * This file bears almost no resemblance to the original m68k file,
        !             5:  * so the following copyright notice is questionable, but we are
        !             6:  * nice people.
        !             7:  */
        !             8:
        !             9: /*
        !            10:  * Copyright (c) 1988 University of Utah.
        !            11:  * Copyright (c) 1982, 1986, 1990, 1993
        !            12:  *     The Regents of the University of California.  All rights reserved.
        !            13:  *
        !            14:  * This code is derived from software contributed to Berkeley by
        !            15:  * the Systems Programming Group of the University of Utah Computer
        !            16:  * Science Department.
        !            17:  *
        !            18:  * Redistribution and use in source and binary forms, with or without
        !            19:  * modification, are permitted provided that the following conditions
        !            20:  * are met:
        !            21:  * 1. Redistributions of source code must retain the above copyright
        !            22:  *    notice, this list of conditions and the following disclaimer.
        !            23:  * 2. Redistributions in binary form must reproduce the above copyright
        !            24:  *    notice, this list of conditions and the following disclaimer in the
        !            25:  *    documentation and/or other materials provided with the distribution.
        !            26:  * 3. Neither the name of the University nor the names of its contributors
        !            27:  *    may be used to endorse or promote products derived from this software
        !            28:  *    without specific prior written permission.
        !            29:  *
        !            30:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            31:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            32:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            33:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            34:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            35:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            36:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            37:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            38:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            39:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            40:  * SUCH DAMAGE.
        !            41:  *
        !            42:  * from: Utah $Hdr: pte.h 1.13 92/01/20$
        !            43:  *
        !            44:  *     @(#)pte.h       8.1 (Berkeley) 6/10/93
        !            45:  */
        !            46:
        !            47: #ifndef        _MACHINE_MMU_H_
        !            48: #define        _MACHINE_MMU_H_
        !            49:
        !            50: /*
        !            51:  * Parameters which determine the 'geometry' of the m88K page tables in memory.
        !            52:  */
        !            53:
        !            54: #define SDT_BITS       10              /* M88K segment table size bits */
        !            55: #define PDT_BITS       10              /* M88K page table size bits */
        !            56: #define PG_BITS                PAGE_SHIFT      /* M88K hardware page size bits */
        !            57:
        !            58: /*
        !            59:  * Common fields for APR, SDT and PTE
        !            60:  */
        !            61:
        !            62: /* address frame */
        !            63: #define        PG_FRAME        0xfffff000
        !            64: #define        PG_SHIFT        PG_BITS
        !            65: #define        PG_PFNUM(x)     (((x) & PG_FRAME) >> PG_SHIFT)
        !            66:
        !            67: /* cache control bits */
        !            68: #define        CACHE_DFL       0x00000000
        !            69: #define        CACHE_INH       0x00000040      /* cache inhibit */
        !            70: #define        CACHE_GLOBAL    0x00000080      /* global scope */
        !            71: #define        CACHE_WT        0x00000200      /* write through */
        !            72:
        !            73: #define        CACHE_MASK      (CACHE_INH | CACHE_GLOBAL | CACHE_WT)
        !            74:
        !            75: /*
        !            76:  * Area descriptors
        !            77:  */
        !            78:
        !            79: typedef        u_int32_t       apr_t;
        !            80:
        !            81: #define        APR_V           0x00000001      /* valid bit */
        !            82:
        !            83: /*
        !            84:  * 88200 PATC (TLB)
        !            85:  */
        !            86:
        !            87: #define PATC_ENTRIES   56
        !            88:
        !            89: /*
        !            90:  * BATC entries
        !            91:  */
        !            92:
        !            93: #define        BATC_V          0x00000001
        !            94: #define        BATC_PROT       0x00000002
        !            95: #define        BATC_INH        0x00000004
        !            96: #define        BATC_GLOBAL     0x00000008
        !            97: #define        BATC_WT         0x00000010
        !            98: #define        BATC_SO         0x00000020
        !            99:
        !           100:
        !           101: /*
        !           102:  * Segment table entries
        !           103:  */
        !           104:
        !           105: typedef u_int32_t      sdt_entry_t;
        !           106:
        !           107: #define        SG_V            0x00000001
        !           108: #define        SG_NV           0x00000000
        !           109: #define        SG_PROT         0x00000004
        !           110: #define        SG_RO           0x00000004
        !           111: #define        SG_RW           0x00000000
        !           112: #define        SG_SO           0x00000100
        !           113:
        !           114: #define        SDT_VALID(sdt)  (*(sdt) & SG_V)
        !           115: #define        SDT_SUP(sdt)    (*(sdt) & SG_SO)
        !           116: #define        SDT_WP(sdt)     (*(sdt) & SG_PROT)
        !           117:
        !           118: /*
        !           119:  * Page table entries
        !           120:  */
        !           121:
        !           122: typedef u_int32_t      pt_entry_t;
        !           123:
        !           124: #define        PG_V            0x00000001
        !           125: #define        PG_NV           0x00000000
        !           126: #define        PG_PROT         0x00000004
        !           127: #define        PG_U            0x00000008
        !           128: #define        PG_M            0x00000010
        !           129: #define        PG_M_U          0x00000018
        !           130: #define        PG_RO           0x00000004
        !           131: #define        PG_RW           0x00000000
        !           132: #define        PG_SO           0x00000100
        !           133: #define        PG_W            0x00000020      /* XXX unused but reserved field */
        !           134: #define        PG_U0           0x00000400      /* U0 bit for M88110 */
        !           135: #define        PG_U1           0x00000800      /* U1 bit for M88110 */
        !           136:
        !           137: #define        PDT_VALID(pte)  (*(pte) & PG_V)
        !           138: #define        PDT_SUP(pte)    (*(pte) & PG_SO)
        !           139: #define        PDT_WP(pte)     (*(pte) & PG_PROT)
        !           140:
        !           141: /*
        !           142:  * Indirect descriptors (mc81110)
        !           143:  */
        !           144:
        !           145: typedef        u_int32_t       pt_ind_entry_t;
        !           146:
        !           147: /* validity bits */
        !           148: #define        IND_V           0x00000001
        !           149: #define        IND_NV          0x00000000
        !           150: #define        IND_MASKED      0x00000002
        !           151: #define        IND_UNMASKED    0x00000003
        !           152: #define        IND_MASK        0x00000003
        !           153:
        !           154: #define        IND_FRAME       0xfffffffc
        !           155: #define        IND_SHIFT       2
        !           156:
        !           157: #define        IND_PDA(x)      ((x) & IND_FRAME >> IND_SHIFT)
        !           158:
        !           159: /*
        !           160:  * Number of entries in a page table.
        !           161:  */
        !           162:
        !           163: #define        SDT_ENTRIES     (1<<(SDT_BITS))
        !           164: #define PDT_ENTRIES    (1<<(PDT_BITS))
        !           165:
        !           166: /*
        !           167:  * Size in bytes of a single page table.
        !           168:  */
        !           169:
        !           170: #define SDT_SIZE       (sizeof(sdt_entry_t) * SDT_ENTRIES)
        !           171: #define PDT_SIZE       (sizeof(pt_entry_t) * PDT_ENTRIES)
        !           172:
        !           173: /*
        !           174:  * Shifts and masks
        !           175:  */
        !           176:
        !           177: #define SDT_SHIFT      (PDT_BITS + PG_BITS)
        !           178: #define PDT_SHIFT      (PG_BITS)
        !           179:
        !           180: #define SDT_MASK       (((1 << SDT_BITS) - 1) << SDT_SHIFT)
        !           181: #define PDT_MASK       (((1 << PDT_BITS) - 1) << PDT_SHIFT)
        !           182:
        !           183: #define        SDTIDX(va)      (((va) & SDT_MASK) >> SDT_SHIFT)
        !           184: #define        PDTIDX(va)      (((va) & PDT_MASK) >> PDT_SHIFT)
        !           185:
        !           186: /*
        !           187:  * Parameters and macros for BATC
        !           188:  */
        !           189:
        !           190: /* number of bits to BATC shift (log2(BATC_BLKBYTES)) */
        !           191: #define BATC_BLKSHIFT  19
        !           192: /* 'block' size of a BATC entry mapping */
        !           193: #define BATC_BLKBYTES  (1 << BATC_BLKSHIFT)
        !           194: /* BATC block mask */
        !           195: #define BATC_BLKMASK   (BATC_BLKBYTES-1)
        !           196: /* number of BATC entries */
        !           197: #define BATC_MAX       8
        !           198:
        !           199: /* physical and logical block address */
        !           200: #define        BATC_PSHIFT     6
        !           201: #define        BATC_VSHIFT     (BATC_PSHIFT + (32 - BATC_BLKSHIFT))
        !           202:
        !           203: #define BATC_BLK_ALIGNED(x)    ((x & BATC_BLKMASK) == 0)
        !           204:
        !           205: #define M88K_BTOBLK(x) (x >> BATC_BLKSHIFT)
        !           206:
        !           207: static pt_entry_t invalidate_pte(pt_entry_t *);
        !           208: static __inline__ pt_entry_t
        !           209: invalidate_pte(pt_entry_t *pte)
        !           210: {
        !           211:        pt_entry_t oldpte;
        !           212:
        !           213:        oldpte = PG_NV;
        !           214:        __asm__ __volatile__
        !           215:            ("xmem %0, %2, r0" : "=r"(oldpte) : "0"(oldpte), "r"(pte));
        !           216:        __asm__ __volatile__ ("tb1 0, r0, 0");
        !           217:        return oldpte;
        !           218: }
        !           219:
        !           220: #endif /* __MACHINE_MMU_H__ */

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