1 /* $OpenBSD: pmap.h,v 1.56 2023/12/11 22:12:53 kettenis Exp $ */
2
3 /*
4 * Copyright (c) 2002-2004 Michael Shalayeff
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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26 * THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #ifndef _MACHINE_PMAP_H_
30 #define _MACHINE_PMAP_H_
31
32 #include <uvm/uvm_object.h>
33 #include <sys/mutex.h>
34
35 #ifdef _KERNEL
36 #include <sys/systm.h>
37 #include <machine/pte.h>
38
39 struct pmap {
40 struct mutex pm_mtx;
41 struct uvm_object pm_obj;
42 struct vm_page *pm_ptphint;
43 struct vm_page *pm_pdir_pg; /* vm_page for pdir */
44 volatile u_int32_t *pm_pdir; /* page dir (read-only after create) */
45 pa_space_t pm_space; /* space id (read-only after create) */
46 u_int pm_pid; /* prot id (read-only after create) */
47
48 struct pmap_statistics pm_stats;
49 };
50 typedef struct pmap *pmap_t;
51
52 #define HPPA_MAX_PID 0xfffa
53 #define HPPA_SID_MAX 0x7ffd
54 #define HPPA_SID_KERNEL 0
55 #define HPPA_PID_KERNEL 2
56
57 #define KERNEL_ACCESS_ID 1
58 #define KERNEL_TEXT_PROT (TLB_AR_KRX | (KERNEL_ACCESS_ID << 1))
59 #define KERNEL_DATA_PROT (TLB_AR_KRW | (KERNEL_ACCESS_ID << 1))
60
61 struct pv_entry { /* locked by its list's pvh_lock */
62 struct pv_entry *pv_next;
63 struct pmap *pv_pmap; /* the pmap */
64 vaddr_t pv_va; /* the virtual address */
65 struct vm_page *pv_ptp; /* the vm_page of the PTP */
66 };
67
68 /* also match the hardware tlb walker definition */
69 struct vp_entry {
70 u_int vp_tag;
71 u_int vp_tlbprot;
72 u_int vp_tlbpage;
73 u_int vp_ptr;
74 };
75
76 extern void gateway_page(void);
77 extern struct pmap kernel_pmap_store;
78
79 #if defined(HP7100LC_CPU) || defined(HP7300LC_CPU)
80 extern int pmap_hptsize;
81 extern struct pdc_hwtlb pdc_hwtlb;
82 #endif
83
84 /*
85 * pool quickmaps
86 */
87 #define pmap_map_direct(pg) ((vaddr_t)VM_PAGE_TO_PHYS(pg))
88 struct vm_page *pmap_unmap_direct(vaddr_t);
89 #define __HAVE_PMAP_DIRECT
90
91 /*
92 * according to the parisc manual aliased va's should be
93 * different by high 12 bits only.
94 */
95 #define PMAP_PREFER
96 /* pmap prefer alignment */
97 #define PMAP_PREFER_ALIGN() (HPPA_PGALIAS)
98 /* pmap prefer offset within alignment */
99 #define PMAP_PREFER_OFFSET(of) ((of) & HPPA_PGAOFF)
100
101 #define pmap_sid2pid(s) (((s) + 1) << 1)
102 #define pmap_kernel() (&kernel_pmap_store)
103 #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
104 #define pmap_update(pm) (void)(pm)
105
106 #define PG_PMAP_MOD PG_PMAP0 /* modified */
107 #define PG_PMAP_REF PG_PMAP1 /* referenced */
108
109 #define pmap_clear_modify(pg) pmap_changebit(pg, 0, PTE_PROT(TLB_DIRTY))
110 #define pmap_clear_reference(pg) pmap_changebit(pg, PTE_PROT(TLB_REFTRAP), 0)
111 #define pmap_is_modified(pg) pmap_testbit(pg, PG_PMAP_MOD)
112 #define pmap_is_referenced(pg) pmap_testbit(pg, PG_PMAP_REF)
113
114 #define pmap_init_percpu() do { /* nothing */ } while (0)
115 #define pmap_unuse_final(p) /* nothing */
116 #define pmap_remove_holes(vm) do { /* nothing */ } while (0)
117
118 void pmap_bootstrap(vaddr_t);
119 boolean_t pmap_changebit(struct vm_page *, pt_entry_t, pt_entry_t);
120 boolean_t pmap_testbit(struct vm_page *, int);
121 void pmap_page_write_protect(struct vm_page *);
122 void pmap_write_protect(struct pmap *, vaddr_t, vaddr_t, vm_prot_t);
123 void pmap_remove(struct pmap *pmap, vaddr_t sva, vaddr_t eva);
124 void pmap_page_remove(struct vm_page *pg);
125
126 static __inline int
pmap_prot(struct pmap * pmap,int prot)127 pmap_prot(struct pmap *pmap, int prot)
128 {
129 extern u_int hppa_prot[];
130 return (hppa_prot[prot] | (pmap == pmap_kernel()? 0 : TLB_USER));
131 }
132
133 static __inline void
pmap_page_protect(struct vm_page * pg,vm_prot_t prot)134 pmap_page_protect(struct vm_page *pg, vm_prot_t prot)
135 {
136 if (prot == PROT_READ) {
137 pmap_page_write_protect(pg);
138 } else {
139 KASSERT(prot == PROT_NONE);
140 pmap_page_remove(pg);
141 }
142 }
143
144 static __inline void
pmap_protect(struct pmap * pmap,vaddr_t sva,vaddr_t eva,vm_prot_t prot)145 pmap_protect(struct pmap *pmap, vaddr_t sva, vaddr_t eva, vm_prot_t prot)
146 {
147 if (prot != PROT_NONE)
148 pmap_write_protect(pmap, sva, eva, prot);
149 else
150 pmap_remove(pmap, sva, eva);
151 }
152
153 #endif /* _KERNEL */
154
155 #if !defined(_LOCORE)
156 struct pv_entry;
157 struct vm_page_md {
158 struct mutex pvh_mtx;
159 struct pv_entry *pvh_list; /* head of list (locked by pvh_mtx) */
160 };
161
162 #define VM_MDPAGE_INIT(pg) do { \
163 mtx_init(&(pg)->mdpage.pvh_mtx, IPL_VM); \
164 (pg)->mdpage.pvh_list = NULL; \
165 } while (0)
166 #endif
167
168 #endif /* _MACHINE_PMAP_H_ */
169