1 /* $NetBSD: pmap.h,v 1.20 2008/04/28 20:23:37 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef _MACHINE_PMAP_H 30 #define _MACHINE_PMAP_H 31 32 #include <sys/simplelock.h> 33 34 /* 35 * NB: The details of struct pmap are exposed ONLY when 36 * building a kernel. LKMs and user-level programs see 37 * only this anonymous declaration. Note that the actual 38 * declaration may vary on different m68k kernels. 39 */ 40 struct pmap; 41 typedef struct pmap *pmap_t; 42 43 /* 44 * Physical map structures exported to the VM code. 45 * XXX - Does user-level code really see this struct? 46 */ 47 48 struct pmap { 49 unsigned char *pm_segmap; /* soft copy of segmap */ 50 int pm_ctxnum; /* MMU context number */ 51 struct simplelock pm_lock; /* lock on pmap */ 52 int pm_refcount; /* reference count */ 53 int pm_version; 54 }; 55 56 #ifdef _KERNEL 57 extern struct pmap kernel_pmap_store; 58 #define pmap_kernel() (&kernel_pmap_store) 59 60 /* 61 * We give the pmap code a chance to resolve faults by 62 * reloading translations that it was forced to unload. 63 * This function does that, and calls vm_fault if it 64 * could not resolve the fault by reloading the MMU. 65 */ 66 int _pmap_fault(struct vm_map *, vaddr_t, vm_prot_t); 67 68 /* This lets us have some say in choosing VA locations. */ 69 extern void pmap_prefer(vaddr_t, vaddr_t *); 70 #define PMAP_PREFER(fo, ap, sz, td) pmap_prefer((fo), (ap)) 71 72 /* This needs to be a macro for kern_sysctl.c */ 73 extern segsz_t pmap_resident_pages(pmap_t); 74 #define pmap_resident_count(pmap) (pmap_resident_pages(pmap)) 75 76 /* This needs to be a macro for vm_mmap.c */ 77 extern segsz_t pmap_wired_pages(pmap_t); 78 #define pmap_wired_count(pmap) (pmap_wired_pages(pmap)) 79 80 /* We use the PA plus some low bits for device mmap. */ 81 #define pmap_phys_address(addr) (addr) 82 83 #define pmap_update(pmap) /* nothing (yet) */ 84 85 /* Map a given physical region to a virtual region */ 86 extern vaddr_t pmap_map(vaddr_t, paddr_t, paddr_t, int); 87 88 /* Extract the PMEG for a given physical address. */ 89 extern int _pmap_extract_pmeg(pmap_t, vaddr_t); 90 91 static __inline void 92 pmap_remove_all(struct pmap *pmap) 93 { 94 /* Nothing. */ 95 } 96 97 /* 98 * Since PTEs also contain type bits, we have to have some way 99 * to tell pmap_enter `this is an IO page' or `this is not to 100 * be cached'. Since physical addresses are always aligned, we 101 * can do this with the low order bits. 102 * 103 * The values below must agree with pte.h such that: 104 * (PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO 105 */ 106 #define PMAP_OBMEM 0x00 107 #define PMAP_OBIO 0x04 /* tells pmap_enter to use PG_OBIO */ 108 #define PMAP_MBMEM 0x08 /* etc (sun-2/120) */ 109 #define PMAP_MBIO 0x0C /* etc (sun-2/120) */ 110 #define PMAP_VME0 0x08 /* etc (sun-2/50) */ 111 #define PMAP_VME8 0x0C /* etc (sun-2/50) */ 112 #define PMAP_NC 0x00 /* tells pmap_enter to set PG_NC */ 113 #define PMAP_SPEC 0x0C /* mask to get all above. */ 114 115 #endif /* _KERNEL */ 116 117 void pmap_procwr(struct proc *, vaddr_t, size_t); 118 119 #endif /* _MACHINE_PMAP_H */ 120