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Annotation of researchv9/sys/sun3/mmu.h, revision 1.1.1.1

1.1       root        1: /*      @(#)mmu.h 1.1 86/02/03 SMI      */
                      2: 
                      3: /*
                      4:  * Copyright (c) 1985 by Sun Microsystems, Inc.
                      5:  */
                      6: 
                      7: /* 
                      8:  * Sun-3 memory management.
                      9:  */
                     10: #define KCONTEXT        0      /* Kernel context (no valid user pages) */
                     11: #define        NCONTEXT         8      /* Number of contexts */
                     12: #define        CONTEXTMASK     (NCONTEXT-1)
                     13: 
                     14: /*
                     15:  * Hardware segment and page registers and constants.
                     16:  */
                     17: #define        NSEGMAP 2048            /* # of segments per context */
                     18: #define        SEGINV  (NPMEG-1)       /* invalid pmeg - no access */
                     19: #define        NPAGSEG 16              /* # of pages per segment */
                     20: #define        NPME    4096            /* number of hardware page map entries */
                     21: #define        NPMEG   (NPME/NPAGSEG)  /* # of pme groups (segment allocation) */
                     22: 
                     23: /*
                     24:  * Function code register values.
                     25:  */
                     26: #define        FC_UD   1               /* user data */
                     27: #define        FC_UP   2               /* user program */
                     28: #define        FC_MAP  3               /* Sun-3 memory maps */
                     29: #define        FC_SD   5               /* supervisor data */
                     30: #define        FC_SP   6               /* supervisor program */
                     31: #define        FC_CPU  7               /* cpu space */
                     32: 
                     33: /*
                     34:  * FC_MAP base addresses
                     35:  */
                     36: #define        IDPROMBASE      0x00000000      /* id prom base */
                     37: #define        PAGEBASE        0x10000000      /* page map base */
                     38: #define        SEGMENTBASE     0x20000000      /* segment map base */
                     39: #define        CONTEXTBASE     0x30000000      /* context map base */
                     40: 
                     41: #define IDPROMSIZE     0x20            /* size of id prom in bytes */
                     42: 
                     43: /*
                     44:  * Masks for relevant bits of virtual address
                     45:  * when accessing control space devices
                     46:  */
                     47: #define        PAGEADDRBITS    0x0FFFE000      /* page map virtual address mask */
                     48: #define        SEGMENTADDRBITS 0x0FFE0000      /* segment map virtual address mask */
                     49: 
                     50: /*
                     51:  * 68020 Cache Control Register
                     52:  */
                     53: #define CACHE_ENABLE   0x1     /* enable the cache */
                     54: #define CACHE_FREEZE   0x2     /* freeze the cache */
                     55: #define CACHE_CLRENTRY 0x4     /* clear entry specified by cache addr reg */
                     56: #define CACHE_CLEAR    0x8     /* clear entire cache */

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