1 /* $NetBSD: pmap_motorola.h,v 1.43 2023/12/31 21:59:24 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. 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 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)pmap.h 8.1 (Berkeley) 6/10/93
36 */
37
38 /*
39 * Copyright (c) 1987 Carnegie-Mellon University
40 *
41 * This code is derived from software contributed to Berkeley by
42 * the Systems Programming Group of the University of Utah Computer
43 * Science Department.
44 *
45 * Redistribution and use in source and binary forms, with or without
46 * modification, are permitted provided that the following conditions
47 * are met:
48 * 1. Redistributions of source code must retain the above copyright
49 * notice, this list of conditions and the following disclaimer.
50 * 2. Redistributions in binary form must reproduce the above copyright
51 * notice, this list of conditions and the following disclaimer in the
52 * documentation and/or other materials provided with the distribution.
53 * 3. All advertising materials mentioning features or use of this software
54 * must display the following acknowledgement:
55 * This product includes software developed by the University of
56 * California, Berkeley and its contributors.
57 * 4. Neither the name of the University nor the names of its contributors
58 * may be used to endorse or promote products derived from this software
59 * without specific prior written permission.
60 *
61 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
62 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
63 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
64 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
65 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
66 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
67 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
68 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
69 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
70 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
71 * SUCH DAMAGE.
72 *
73 * @(#)pmap.h 8.1 (Berkeley) 6/10/93
74 */
75
76 #ifndef _M68K_PMAP_MOTOROLA_H_
77 #define _M68K_PMAP_MOTOROLA_H_
78
79 #ifdef _KERNEL_OPT
80 #include "opt_m68k_arch.h"
81 #endif
82
83 #include <machine/cpu.h>
84 #include <machine/pte.h>
85
86 /*
87 * Pmap stuff
88 */
89 struct pmap {
90 pt_entry_t *pm_ptab; /* KVA of page table */
91 st_entry_t *pm_stab; /* KVA of segment table */
92 u_int pm_stfree; /* 040: free lev2 blocks */
93 st_entry_t *pm_stpa; /* 040: ST phys addr */
94 uint16_t pm_sref; /* segment table ref count */
95 u_int pm_count; /* pmap reference count */
96 struct pmap_statistics pm_stats; /* pmap statistics */
97 int pm_ptpages; /* more stats: PT pages */
98 };
99
100 /*
101 * Root Pointer attributes for Supervisor and User modes.
102 *
103 * Supervisor:
104 * - No index limit (Lower limit == 0)
105 * - Points to Short format descriptor table.
106 * - Shared Globally
107 *
108 * User:
109 * - No index limit (Lower limit == 0)
110 * - Points to Short format descriptor table.
111 */
112 #define MMU51_SRP_BITS (DTE51_LOWER | DTE51_SG | DT51_SHORT)
113 #define MMU51_CRP_BITS (DTE51_LOWER | DT51_SHORT)
114
115 /*
116 * MMU specific segment values
117 *
118 * We are using following segment layout in m68k pmap_motorola.c:
119 * 68020/030 4KB/page: l1,l2,page == 10,10,12 (%tc = 0x82c0aa00)
120 * 68020/030 8KB/page: l1,l2,page == 8,11,13 (%tc = 0x82d08b00)
121 * 68040/060 4KB/page: l1,l2,l3,page == 7,7,6,12 (%tc = 0x8000)
122 * 68040/060 8KB/page: l1,l2,l3,page == 7,7,5,13 (%tc = 0xc000)
123 *
124 * 68020/030 l2 size is chosen per NPTEPG, a number of page table entries
125 * per page, to use one whole page for PTEs per one segment table entry,
126 * and maybe also because 68020 HP MMU machines use similar structures.
127 *
128 * 68040/060 layout is defined by hardware design and not configurable,
129 * as defined in <m68k/pte_motorola.h>.
130 *
131 * Even on 68040/060, we still appropriate 2-level ste-pte pmap structures
132 * for 68020/030 (derived from 4.4BSD/hp300) to handle 040's 3-level MMU.
133 * TIA_SIZE and TIB_SIZE are used to represent such pmap structures and
134 * they are also referred on 040/060.
135 *
136 * NBSEG and SEGOFSET are used to check l2 STE of the specified VA,
137 * so they have different values between 020/030 and 040/060.
138 */
139 /* 8KB / 4KB */
140 #define TIB_SHIFT (PGSHIFT - 2) /* 11 / 10 */
141 #define TIB_SIZE (1U << TIB_SHIFT) /* 2048 / 1024 */
142 #define TIA_SHIFT (32 - TIB_SHIFT - PGSHIFT) /* 8 / 10 */
143 #define TIA_SIZE (1U << TIA_SHIFT) /* 256 / 1024 */
144
145 #define MMU51_TCR_BITS (TCR51_E | TCR51_SRE | \
146 __SHIFTIN(PGSHIFT, TCR51_PS) | \
147 __SHIFTIN(TIA_SHIFT, TCR51_TIA) | \
148 __SHIFTIN(TIB_SHIFT, TCR51_TIB))
149 #define MMU40_TCR_BITS (TCR40_E | \
150 __SHIFTIN(PGSHIFT - 12, TCR40_P))
151
152 #define SEGSHIFT (TIB_SHIFT + PGSHIFT) /* 24 / 22 */
153
154 #define NBSEG30 (1U << SEGSHIFT)
155 #define NBSEG40 (1U << SG4_SHIFT2)
156
157 #if ( defined(M68020) || defined(M68030)) && \
158 (!defined(M68040) && !defined(M68060))
159 #define NBSEG NBSEG30
160 #elif ( defined(M68040) || defined(M68060)) && \
161 (!defined(M68020) && !defined(M68030))
162 #define NBSEG NBSEG40
163 #else
164 #define NBSEG ((mmutype == MMU_68040) ? NBSEG40 : NBSEG30)
165 #endif
166
167 #define SEGOFSET (NBSEG - 1) /* byte offset into segment */
168
169 #define m68k_round_seg(x) ((((vaddr_t)(x)) + SEGOFSET) & ~SEGOFSET)
170 #define m68k_trunc_seg(x) ((vaddr_t)(x) & ~SEGOFSET)
171 #define m68k_seg_offset(x) ((vaddr_t)(x) & SEGOFSET)
172
173 /*
174 * On the 040, we keep track of which level 2 blocks are already in use
175 * with the pm_stfree mask. Bits are arranged from LSB (block 0) to MSB
176 * (block 31). For convenience, the level 1 table is considered to be
177 * block 0.
178 *
179 * MAX[KU]L2SIZE control how many pages of level 2 descriptors are allowed
180 * for the kernel and users.
181 * 16 or 8 implies only the initial "segment table" page is used,
182 * i.e. it means PAGE_SIZE / (SG4_LEV1SIZE * sizeof(st_entry_t)).
183 * WARNING: don't change MAXUL2SIZE unless you can allocate
184 * physically contiguous pages for the ST in pmap_motorola.c!
185 */
186 #define MAXKL2SIZE 32
187 #if PAGE_SIZE == 8192 /* NBPG / (SG4_LEV1SIZE * sizeof(st_entry_t)) */
188 #define MAXUL2SIZE 16
189 #else
190 #define MAXUL2SIZE 8
191 #endif
192 #define l2tobm(n) (1U << (n))
193 #define bmtol2(n) (ffs(n) - 1)
194
195 /*
196 * For each struct vm_page, there is a list of all currently valid virtual
197 * mappings of that page. An entry is a pv_entry, the list is pv_table.
198 */
199 struct pv_entry {
200 struct pv_entry *pv_next; /* next pv_entry */
201 struct pmap *pv_pmap; /* pmap where mapping lies */
202 vaddr_t pv_va; /* virtual address for mapping */
203 st_entry_t *pv_ptste; /* non-zero if VA maps a PT page */
204 struct pmap *pv_ptpmap; /* if pv_ptste, pmap for PT page */
205 };
206
207 extern struct pv_header *pv_table; /* array of entries, one per page */
208
209 #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
210 #define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count)
211
212 #define pmap_update(pmap) __nothing /* nothing (yet) */
213
214 static __inline bool
pmap_remove_all(struct pmap * pmap)215 pmap_remove_all(struct pmap *pmap)
216 {
217 /* Nothing. */
218 return false;
219 }
220
221 extern paddr_t Sysseg_pa;
222 extern st_entry_t *Sysseg;
223 extern pt_entry_t *Sysmap, *Sysptmap;
224 #define SYSMAP_VA VM_MAX_KERNEL_ADDRESS
225 extern vsize_t Sysptsize;
226 extern vsize_t mem_size;
227 extern vaddr_t virtual_avail, virtual_end;
228 extern u_int protection_codes[];
229 #if defined(M68040) || defined(M68060)
230 extern u_int protostfree;
231 #endif
232 #ifdef CACHE_HAVE_VAC
233 extern u_int pmap_aliasmask;
234 #endif
235
236 extern char *vmmap; /* map for mem, dumps, etc. */
237 extern void *CADDR1, *CADDR2;
238 extern void *msgbufaddr;
239
240 /* for lwp0 uarea initialization after MMU enabled */
241 extern vaddr_t lwp0uarea;
242 void pmap_bootstrap_finalize(void);
243
244 vaddr_t pmap_map(vaddr_t, paddr_t, paddr_t, int);
245 void pmap_procwr(struct proc *, vaddr_t, size_t);
246 #define PMAP_NEED_PROCWR
247
248 #ifdef CACHE_HAVE_VAC
249 void pmap_prefer(vaddr_t, vaddr_t *);
250 #define PMAP_PREFER(foff, vap, sz, td) pmap_prefer((foff), (vap))
251 #endif
252
253 void _pmap_set_page_cacheable(struct pmap *, vaddr_t);
254 void _pmap_set_page_cacheinhibit(struct pmap *, vaddr_t);
255 int _pmap_page_is_cacheable(struct pmap *, vaddr_t);
256
257 paddr_t vtophys(vaddr_t va);
258
259 #endif /* !_M68K_PMAP_MOTOROLA_H_ */
260