1 /* 2 * Copyright (c) 1987 Carnegie-Mellon University 3 * Copyright (c) 1992 OMRON Corporation. 4 * Copyright (c) 1991, 1992 Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * %sccs.include.redist.c% 12 * 13 * OMRON: $Id: pmap.h,v 1.2 92/06/14 06:29:43 moti Exp $ 14 * 15 * @(#)pmap.h 7.1 (Berkeley) 06/15/92 16 */ 17 18 #ifndef _PMAP_MACHINE_ 19 #define _PMAP_MACHINE_ 20 21 #define LUNA_PAGE_SIZE NBPG 22 #define LUNA_SEG_SIZE NBSEG 23 24 #define luna_trunc_seg(x) (((unsigned)(x)) & ~(LUNA_SEG_SIZE-1)) 25 #define luna_round_seg(x) luna_trunc_seg((unsigned)(x) + LUNA_SEG_SIZE-1) 26 27 /* 28 * Pmap stuff 29 */ 30 struct pmap { 31 struct pte *pm_ptab; /* KVA of page table */ 32 struct ste *pm_stab; /* KVA of segment table */ 33 int pm_stchanged; /* ST changed */ 34 int pm_stfree; /* 040: free lev2 blocks */ 35 struct ste *pm_stpa; /* 040: ST phys addr */ 36 short pm_sref; /* segment table ref count */ 37 short pm_count; /* pmap reference count */ 38 simple_lock_data_t pm_lock; /* lock on pmap */ 39 struct pmap_statistics pm_stats; /* pmap statistics */ 40 long pm_ptpages; /* more stats: PT pages */ 41 }; 42 43 typedef struct pmap *pmap_t; 44 45 extern struct pmap kernel_pmap_store; 46 #define kernel_pmap (&kernel_pmap_store) 47 48 /* 49 * On the 040 we keep track of which level 2 blocks are already in use 50 * with the pm_stfree mask. Bits are arranged from LSB (block 0) to MSB 51 * (block 31). For convenience, the level 1 table is considered to be 52 * block 0. 53 * 54 * MAX[KU]L2SIZE control how many pages of level 2 descriptors are allowed. 55 * for the kernel and users. 8 implies only the initial "segment table" 56 * page is used. WARNING: don't change MAXUL2SIZE unless you can allocate 57 * physically contiguous pages for the ST in pmap.c! 58 */ 59 #define MAXKL2SIZE 16 60 #define MAXUL2SIZE 8 61 #define l2tobm(n) (1 << (n)) 62 #define bmtol2(n) (ffs(n) - 1) 63 64 /* 65 * Macros for speed 66 */ 67 #define PMAP_ACTIVATE(pmapp, pcbp, iscurproc) \ 68 if ((pmapp) != NULL && (pmapp)->pm_stchanged) { \ 69 (pcbp)->pcb_ustp = \ 70 luna_btop(pmap_extract(kernel_pmap, \ 71 ((vm_offset_t)(pmapp)->pm_stab))); \ 72 if (iscurproc) \ 73 loadustp((pcbp)->pcb_ustp); \ 74 (pmapp)->pm_stchanged = FALSE; \ 75 } 76 #define PMAP_DEACTIVATE(pmapp, pcbp) 77 78 /* 79 * For each vm_page_t, there is a list of all currently valid virtual 80 * mappings of that page. An entry is a pv_entry_t, the list is pv_table. 81 */ 82 typedef struct pv_entry { 83 struct pv_entry *pv_next; /* next pv_entry */ 84 struct pmap *pv_pmap; /* pmap where mapping lies */ 85 vm_offset_t pv_va; /* virtual address for mapping */ 86 struct ste *pv_ptste; /* non-zero if VA maps a PT page */ 87 struct pmap *pv_ptpmap; /* if pv_ptste, pmap for PT page */ 88 int pv_flags; /* flags */ 89 } *pv_entry_t; 90 91 #define PV_CI 0x01 /* all entries must be cache inhibited */ 92 #define PV_PTPAGE 0x02 /* entry maps a page table page */ 93 94 #ifdef KERNEL 95 pv_entry_t pv_table; /* array of entries, one per page */ 96 97 #define pa_index(pa) atop(pa - vm_first_phys) 98 #define pa_to_pvh(pa) (&pv_table[pa_index(pa)]) 99 100 #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) 101 102 extern struct pte *Sysmap; 103 extern char *vmmap; /* map for mem, dumps, etc. */ 104 105 /* 106 * definitions LUNA IO space mapping 107 */ 108 struct physmap { 109 int pm_phys; 110 int pm_size; 111 int pm_cache; 112 } ; 113 114 #endif 115 116 #endif _PMAP_MACHINE_ 117