1 /* $NetBSD: locore_c.c,v 1.32 2020/06/30 16:20:02 maxv Exp $ */
2
3 /*-
4 * Copyright (c) 1996, 1997, 2002, 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
9 * NASA Ames Research Center.
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 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*-
34 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
35 * All rights reserved.
36 *
37 * This code is derived from software contributed to Berkeley by
38 * William Jolitz.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. Neither the name of the University nor the names of its contributors
49 * may be used to endorse or promote products derived from this software
50 * without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 * SUCH DAMAGE.
63 *
64 * @(#)Locore.c
65 */
66
67 /*-
68 * Copyright (c) 1993, 1994, 1995, 1996, 1997
69 * Charles M. Hannum. All rights reserved.
70 * Copyright (c) 1992 Terrence R. Lambert.
71 *
72 * This code is derived from software contributed to Berkeley by
73 * William Jolitz.
74 *
75 * Redistribution and use in source and binary forms, with or without
76 * modification, are permitted provided that the following conditions
77 * are met:
78 * 1. Redistributions of source code must retain the above copyright
79 * notice, this list of conditions and the following disclaimer.
80 * 2. Redistributions in binary form must reproduce the above copyright
81 * notice, this list of conditions and the following disclaimer in the
82 * documentation and/or other materials provided with the distribution.
83 * 3. All advertising materials mentioning features or use of this software
84 * must display the following acknowledgement:
85 * This product includes software developed by the University of
86 * California, Berkeley and its contributors.
87 * 4. Neither the name of the University nor the names of its contributors
88 * may be used to endorse or promote products derived from this software
89 * without specific prior written permission.
90 *
91 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
92 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
94 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
95 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
96 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
97 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
98 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
99 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
100 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
101 * SUCH DAMAGE.
102 *
103 * @(#)Locore.c
104 */
105
106 #include <sys/cdefs.h>
107 __KERNEL_RCSID(0, "$NetBSD: locore_c.c,v 1.32 2020/06/30 16:20:02 maxv Exp $");
108
109 #include <sys/param.h>
110 #include <sys/systm.h>
111 #include <sys/cpu.h>
112 #include <sys/sched.h>
113 #include <sys/proc.h>
114 #include <sys/ras.h>
115
116 #include <uvm/uvm.h>
117 #include <uvm/uvm_extern.h>
118
119 #include <sh3/locore.h>
120 #include <sh3/pmap.h>
121 #include <sh3/mmu_sh3.h>
122 #include <sh3/mmu_sh4.h>
123
124 void cpu_switch_prepare(struct lwp *, struct lwp *);
125
126 void (*__sh_switch_resume)(struct lwp *);
127
128 /*
129 * Called from cpu_switchto after olwp's state has been saved.
130 * Prepare context switch to nlwp.
131 */
132 void
cpu_switch_prepare(struct lwp * olwp,struct lwp * nlwp)133 cpu_switch_prepare(struct lwp *olwp, struct lwp *nlwp)
134 {
135 struct proc *p = nlwp->l_proc;
136
137 /* Check for Restartable Atomic Sequences. */
138 if (p->p_raslist != NULL) {
139 void *pc;
140
141 pc = ras_lookup(p, (void *)nlwp->l_md.md_regs->tf_spc);
142 if (pc != (void *) -1)
143 nlwp->l_md.md_regs->tf_spc = (int) pc;
144 }
145 }
146
147
148 /*
149 * When no processes are on the run queue, wait for something to come
150 * ready. Separate function for profiling.
151 */
152 void
cpu_idle(void)153 cpu_idle(void)
154 {
155
156 __asm volatile("sleep");
157 }
158
159
160 #ifndef P1_STACK
161 #ifdef SH3
162 /*
163 * Nothing to do for sh3.
164 */
165 void
sh3_switch_setup(struct lwp * l)166 sh3_switch_setup(struct lwp *l)
167 {
168
169 return;
170 }
171 #endif /* SH3 */
172
173
174 #ifdef SH4
175 /*
176 * Prepare kernel stack PTE table. sh4_switch_resume wires these PTEs.
177 */
178 void
sh4_switch_setup(struct lwp * l)179 sh4_switch_setup(struct lwp *l)
180 {
181 struct md_upte *md_upte;
182 uint32_t vpn;
183 pt_entry_t *pte;
184 int i, e;
185
186 md_upte = l->l_md.md_upte;
187 vpn = sh3_trunc_page(uvm_lwp_getuarea(l));
188 e = SH4_UTLB_ENTRY - UPAGES;
189
190 for (i = 0; i < UPAGES; ++i) {
191 pte = __pmap_kpte_lookup(vpn);
192 KDASSERT(pte && *pte != 0);
193
194 /* Address array */
195 md_upte->addr = SH4_UTLB_AA | (e << SH4_UTLB_E_SHIFT);
196 md_upte->data = vpn | SH4_UTLB_AA_D | SH4_UTLB_AA_V;
197 ++md_upte;
198
199 /* Data array */
200 md_upte->addr = SH4_UTLB_DA1 | (e << SH4_UTLB_E_SHIFT);
201 md_upte->data = (*pte & PG_HW_BITS) |
202 SH4_UTLB_DA1_D | SH4_UTLB_DA1_V;
203 ++md_upte;
204
205 vpn += PAGE_SIZE;
206 ++e;
207 }
208 }
209 #endif /* SH4 */
210 #endif /* !P1_STACK */
211