arch/ppc/mmutypes.h

   1 /*
   2  *   Creation Date: <2002/01/13 13:53:14 samuel>
   3  *   Time-stamp: <2002/01/27 19:56:11 samuel>
   4  *
   5  *      <mmutypes.h>
   6  *
   7  *      MMU definitions
   8  *
   9  *   Most of these declarations originate from the Linux Kernel
  10  *
  11  *   Copyright (C) 2002 Samuel Rydh (samuel@ibrium.se)
  12  *
  13  *   This program is free software; you can redistribute it and/or
  14  *   modify it under the terms of the GNU General Public License
  15  *   as published by the Free Software Foundation
  16  *
  17  */
  18
  19 #ifndef _H_MMUTYPES
  20 #define _H_MMUTYPES
  21
  22 /* Hardware Page Table Entry */
  23 typedef struct mPTE {
  24         unsigned long v:1;      /* Entry is valid */
  25         unsigned long vsid:24;  /* Virtual segment identifier */
  26         unsigned long h:1;      /* Hash algorithm indicator */
  27         unsigned long api:6;    /* Abbreviated page index */
  28
  29         unsigned long rpn:20;   /* Real (physical) page number */
  30         unsigned long    :3;    /* Unused */
  31         unsigned long r:1;      /* Referenced */
  32         unsigned long c:1;      /* Changed */
  33         unsigned long w:1;      /* Write-thru cache mode */
  34         unsigned long i:1;      /* Cache inhibited */
  35         unsigned long m:1;      /* Memory coherence */
  36         unsigned long g:1;      /* Guarded */
  37         unsigned long  :1;      /* Unused */
  38         unsigned long pp:2;     /* Page protection */
  39 } mPTE_t;
  40
  41
  42 typedef struct _mBATU {         /* Upper part of BAT (all except 601) */
  43         unsigned long bepi:15;  /* Effective page index (virtual address) */
  44         unsigned long :4;       /* Unused */
  45         unsigned long bl:11;    /* Block size mask */
  46         unsigned long vs:1;     /* Supervisor valid */
  47         unsigned long vp:1;     /* User valid */
  48 } mBATU;
  49
  50 typedef struct _mBATL {         /* Lower part of BAT (all except 601) */
  51         unsigned long brpn:15;  /* Real page index (physical address) */
  52         unsigned long :10;      /* Unused */
  53         unsigned long w:1;      /* Write-thru cache */
  54         unsigned long i:1;      /* Cache inhibit */
  55         unsigned long m:1;      /* Memory coherence */
  56         unsigned long g:1;      /* Guarded (MBZ in IBAT) */
  57         unsigned long :1;       /* Unused */
  58         unsigned long pp:2;     /* Page access protections */
  59 } mBATL;
  60
  61 typedef struct _mBAT {
  62         mBATU batu;             /* Upper register */
  63         mBATL batl;             /* Lower register */
  64 } mBAT;
  65
  66 typedef struct _mSEGREG {
  67         unsigned long t:1;      /* Normal or I/O  type */
  68         unsigned long ks:1;     /* Supervisor 'key' (normally 0) */
  69         unsigned long kp:1;     /* User 'key' (normally 1) */
  70         unsigned long n:1;      /* No-execute */
  71         unsigned long :4;       /* Unused */
  72         unsigned long vsid:24;  /* Virtual Segment Identifier */
  73 } mSEGREG;
  74
  75
  76 #endif   /* _H_MMUTYPES */