1 /* $OpenBSD: locore_c.c,v 1.14 2023/01/06 19:10:18 miod Exp $ */
2 /* $NetBSD: locore_c.c,v 1.13 2006/03/04 01:13:35 uwe Exp $ */
3
4 /*-
5 * Copyright (c) 1996, 1997, 2002 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
10 * NASA Ames Research Center.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*-
35 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
36 * All rights reserved.
37 *
38 * This code is derived from software contributed to Berkeley by
39 * William Jolitz.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 * 3. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * @(#)Locore.c
66 */
67
68 /*-
69 * Copyright (c) 1993, 1994, 1995, 1996, 1997
70 * Charles M. Hannum. All rights reserved.
71 * Copyright (c) 1992 Terrence R. Lambert.
72 *
73 * This code is derived from software contributed to Berkeley by
74 * William Jolitz.
75 *
76 * Redistribution and use in source and binary forms, with or without
77 * modification, are permitted provided that the following conditions
78 * are met:
79 * 1. Redistributions of source code must retain the above copyright
80 * notice, this list of conditions and the following disclaimer.
81 * 2. Redistributions in binary form must reproduce the above copyright
82 * notice, this list of conditions and the following disclaimer in the
83 * documentation and/or other materials provided with the distribution.
84 * 3. All advertising materials mentioning features or use of this software
85 * must display the following acknowledgement:
86 * This product includes software developed by the University of
87 * California, Berkeley and its contributors.
88 * 4. Neither the name of the University nor the names of its contributors
89 * may be used to endorse or promote products derived from this software
90 * without specific prior written permission.
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
93 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
95 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
96 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
97 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
98 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
100 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
101 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
102 * SUCH DAMAGE.
103 *
104 * @(#)Locore.c
105 */
106
107 #include <sys/param.h>
108 #include <sys/systm.h>
109 #include <sys/proc.h>
110 #include <sys/sched.h>
111
112 #include <uvm/uvm_extern.h>
113
114 #include <sh/locore.h>
115 #include <sh/cpu.h>
116 #include <sh/pcb.h>
117 #include <sh/pmap.h>
118 #include <sh/mmu_sh3.h>
119 #include <sh/mmu_sh4.h>
120 #include <sh/ubcreg.h>
121
122 void (*__sh_switch_resume)(struct proc *);
123 void cpu_switch_prepare(struct proc *, struct proc *);
124
125 /*
126 * Prepare context switch from oproc to nproc.
127 * This code is used by cpu_switchto.
128 */
129 void
cpu_switch_prepare(struct proc * oproc,struct proc * nproc)130 cpu_switch_prepare(struct proc *oproc, struct proc *nproc)
131 {
132 nproc->p_stat = SONPROC;
133
134 if (oproc && (oproc->p_md.md_flags & MDP_STEP))
135 _reg_write_2(SH_(BBRB), 0);
136
137 curpcb = nproc->p_md.md_pcb;
138 pmap_activate(nproc);
139
140 if (nproc->p_md.md_flags & MDP_STEP) {
141 int pm_asid = nproc->p_vmspace->vm_map.pmap->pm_asid;
142
143 _reg_write_2(SH_(BBRB), 0);
144 _reg_write_4(SH_(BARB), nproc->p_md.md_regs->tf_spc);
145 _reg_write_1(SH_(BASRB), pm_asid);
146 _reg_write_1(SH_(BAMRB), 0);
147 _reg_write_2(SH_(BRCR), 0x0040);
148 _reg_write_2(SH_(BBRB), 0x0014);
149 }
150
151 curproc = nproc;
152 }
153
154 void
cpu_exit(struct proc * p)155 cpu_exit(struct proc *p)
156 {
157 if (p->p_md.md_flags & MDP_STEP)
158 _reg_write_2(SH_(BBRB), 0);
159
160 pmap_deactivate(p);
161 sched_exit(p);
162 }
163
164 #ifndef P1_STACK
165 #ifdef SH3
166 /*
167 * void sh3_switch_setup(struct proc *p):
168 * prepare kernel stack PTE table. TLB miss handler check these.
169 */
170 void
sh3_switch_setup(struct proc * p)171 sh3_switch_setup(struct proc *p)
172 {
173 pt_entry_t *pte;
174 struct md_upte *md_upte = p->p_md.md_upte;
175 uint32_t vpn;
176 int i;
177
178 vpn = (uint32_t)p->p_addr;
179 vpn &= ~PGOFSET;
180 for (i = 0; i < UPAGES; i++, vpn += PAGE_SIZE, md_upte++) {
181 pte = __pmap_kpte_lookup(vpn);
182 KDASSERT(pte && *pte != 0);
183
184 md_upte->addr = vpn;
185 md_upte->data = (*pte & PG_HW_BITS) | PG_D | PG_V;
186 }
187 }
188 #endif /* SH3 */
189
190 #ifdef SH4
191 /*
192 * void sh4_switch_setup(struct proc *p):
193 * prepare kernel stack PTE table. sh4_switch_resume wired this PTE.
194 */
195 void
sh4_switch_setup(struct proc * p)196 sh4_switch_setup(struct proc *p)
197 {
198 pt_entry_t *pte;
199 struct md_upte *md_upte = p->p_md.md_upte;
200 uint32_t vpn;
201 int i, e;
202
203 vpn = (uint32_t)p->p_addr;
204 vpn &= ~PGOFSET;
205 e = SH4_UTLB_ENTRY - UPAGES;
206 for (i = 0; i < UPAGES; i++, e++, vpn += PAGE_SIZE) {
207 pte = __pmap_kpte_lookup(vpn);
208 KDASSERT(pte && *pte != 0);
209 /* Address array */
210 md_upte->addr = SH4_UTLB_AA | (e << SH4_UTLB_E_SHIFT);
211 md_upte->data = vpn | SH4_UTLB_AA_D | SH4_UTLB_AA_V;
212 md_upte++;
213 /* Data array */
214 md_upte->addr = SH4_UTLB_DA1 | (e << SH4_UTLB_E_SHIFT);
215 md_upte->data = (*pte & PG_HW_BITS) |
216 SH4_UTLB_DA1_D | SH4_UTLB_DA1_V;
217 md_upte++;
218 }
219 }
220 #endif /* SH4 */
221 #endif /* !P1_STACK */
222