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 * from: hp300/include/pmap.h 7.11 (Berkeley) 12/27/92 14 * 15 * @(#)pmap.h 7.3 (Berkeley) 01/02/93 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 47 #define kernel_pmap (&kernel_pmap_store) 48 #define active_pmap(pm) \ 49 ((pm) == kernel_pmap || (pm) == curproc->p_vmspace->vm_map.pmap) 50 51 /* 52 * On the 040 we keep track of which level 2 blocks are already in use 53 * with the pm_stfree mask. Bits are arranged from LSB (block 0) to MSB 54 * (block 31). For convenience, the level 1 table is considered to be 55 * block 0. 56 * 57 * MAX[KU]L2SIZE control how many pages of level 2 descriptors are allowed. 58 * for the kernel and users. 8 implies only the initial "segment table" 59 * page is used. WARNING: don't change MAXUL2SIZE unless you can allocate 60 * physically contiguous pages for the ST in pmap.c! 61 */ 62 #define MAXKL2SIZE 16 63 #define MAXUL2SIZE 8 64 #define l2tobm(n) (1 << (n)) 65 #define bmtol2(n) (ffs(n) - 1) 66 67 /* 68 * Macros for speed 69 */ 70 #define PMAP_ACTIVATE(pmapp, pcbp, iscurproc) \ 71 if ((pmapp) != NULL && (pmapp)->pm_stchanged) { \ 72 (pcbp)->pcb_ustp = luna_btop((vm_offset_t)(pmapp)->pm_stpa); \ 73 if (iscurproc) \ 74 loadustp((pcbp)->pcb_ustp); \ 75 (pmapp)->pm_stchanged = FALSE; \ 76 } 77 #define PMAP_DEACTIVATE(pmapp, pcbp) 78 79 /* 80 * For each vm_page_t, there is a list of all currently valid virtual 81 * mappings of that page. An entry is a pv_entry_t, the list is pv_table. 82 */ 83 typedef struct pv_entry { 84 struct pv_entry *pv_next; /* next pv_entry */ 85 struct pmap *pv_pmap; /* pmap where mapping lies */ 86 vm_offset_t pv_va; /* virtual address for mapping */ 87 struct ste *pv_ptste; /* non-zero if VA maps a PT page */ 88 struct pmap *pv_ptpmap; /* if pv_ptste, pmap for PT page */ 89 int pv_flags; /* flags */ 90 } *pv_entry_t; 91 92 #define PV_CI 0x01 /* header: all entries are cache inhibited */ 93 #define PV_PTPAGE 0x02 /* header: entry maps a page table page */ 94 95 #ifdef KERNEL 96 97 pv_entry_t pv_table; /* array of entries, one per page */ 98 99 #define pa_index(pa) atop(pa - vm_first_phys) 100 #define pa_to_pvh(pa) (&pv_table[pa_index(pa)]) 101 102 #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) 103 104 extern struct pte *Sysmap; 105 extern char *vmmap; /* map for mem, dumps, etc. */ 106 107 /* 108 * definitions LUNA IO space mapping 109 */ 110 struct physmap { 111 int pm_phys; 112 int pm_size; 113 int pm_cache; 114 } ; 115 116 #endif 117 118 #endif _PMAP_MACHINE_ 119