1 /* $NetBSD: machdep.c,v 1.47 2024/03/05 14:15:29 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1996, 1997, 1998, 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace
9 * Simulation Facility, 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 * @(#)machdep.c 7.4 (Berkeley) 6/3/91
65 */
66
67 #include <sys/cdefs.h>
68 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.47 2024/03/05 14:15:29 thorpej Exp $");
69
70 #include "opt_ddb.h"
71 #include "opt_kgdb.h"
72 #include "opt_memsize.h"
73 #include "scif.h"
74 #include "opt_kloader.h"
75 #include "opt_modular.h"
76
77 #include <sys/param.h>
78 #include <sys/systm.h>
79 #include <sys/kernel.h>
80 #include <sys/mount.h>
81 #include <sys/reboot.h>
82 #include <sys/sysctl.h>
83 #include <sys/ksyms.h>
84 #include <sys/device.h>
85 #include <sys/module.h>
86 #include <sys/cpu.h>
87
88 #ifdef KGDB
89 #include <sys/kgdb.h>
90 #include <sh3/dev/scifvar.h>
91 #endif
92 #ifdef DDB
93 #include <machine/db_machdep.h>
94 #include <ddb/db_extern.h>
95 #endif
96
97 #include <sh3/cpu.h>
98 #include <sh3/exception.h>
99 #include <sh3/bscreg.h>
100 #include <machine/intr.h>
101 #include <machine/kloader.h>
102 #include <machine/pcb.h>
103
104 #include <dev/cons.h>
105
106 #include "ksyms.h"
107
108 /* the following is used externally (sysctl_hw) */
109 char machine[] = MACHINE; /* dreamcast */
110 char machine_arch[] = MACHINE_ARCH; /* sh3el */
111
112 void main(void) __attribute__((__noreturn__));
113 void dreamcast_startup(void) __attribute__((__noreturn__));
114
115 void
dreamcast_startup(void)116 dreamcast_startup(void)
117 {
118 extern char edata[], end[];
119 paddr_t kernend;
120
121 /* Clear bss */
122 memset(edata, 0, end - edata);
123
124 /* Initialize CPU ops. */
125 sh_cpu_init(CPU_ARCH_SH4, CPU_PRODUCT_7750);
126
127 /* Console */
128 consinit();
129
130 /* Load memory to UVM */
131 physmem = atop(IOM_RAM_SIZE);
132 kernend = atop(round_page(SH3_P1SEG_TO_PHYS(end)));
133 uvm_page_physload(
134 kernend, atop(IOM_RAM_BEGIN + IOM_RAM_SIZE),
135 kernend, atop(IOM_RAM_BEGIN + IOM_RAM_SIZE),
136 VM_FREELIST_DEFAULT);
137
138 /* Initialize proc0 u-area */
139 sh_proc0_init();
140
141 /* Initialize pmap and start to address translation */
142 pmap_bootstrap();
143
144 /* Debugger. */
145 #if defined(KGDB) && (NSCIF > 0)
146 if (scif_kgdb_init() == 0) {
147 kgdb_debug_init = 1;
148 kgdb_connect(1);
149 }
150 #endif /* KGDB && NSCIF > 0 */
151
152 /* Jump to main */
153 __asm volatile(
154 "jmp @%0;"
155 "mov %1, sp"
156 :: "r"(main),"r"(lwp0.l_md.md_pcb->pcb_sf.sf_r7_bank));
157 /* NOTREACHED */
158 while (1)
159 ;
160 }
161
162 void
consinit(void)163 consinit(void)
164 {
165 static int initted;
166
167 if (initted)
168 return;
169 initted = 1;
170
171 cninit();
172 }
173
174 void
cpu_startup(void)175 cpu_startup(void)
176 {
177
178 cpu_setmodel("SEGA Dreamcast");
179
180 sh_startup();
181 }
182
183 SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup")
184 {
185
186 sysctl_createv(clog, 0, NULL, NULL,
187 CTLFLAG_PERMANENT,
188 CTLTYPE_NODE, "machdep", NULL,
189 NULL, 0, NULL, 0,
190 CTL_MACHDEP, CTL_EOL);
191
192 sysctl_createv(clog, 0, NULL, NULL,
193 CTLFLAG_PERMANENT,
194 CTLTYPE_STRUCT, "console_device", NULL,
195 sysctl_consdev, 0, NULL, sizeof(dev_t),
196 CTL_MACHDEP, CPU_CONSDEV, CTL_EOL);
197 }
198
199 void
cpu_reboot(int howto,char * bootstr)200 cpu_reboot(int howto, char *bootstr)
201 {
202 #ifdef KLOADER
203 struct kloader_bootinfo kbi;
204 #endif
205 static int waittime = -1;
206
207 if (cold) {
208 howto |= RB_HALT;
209 goto haltsys;
210 }
211
212 #ifdef KLOADER
213 /* No bootinfo is required. */
214 kloader_bootinfo_set(&kbi, 0, NULL, NULL, true);
215 if ((howto & RB_HALT) == 0) {
216 if ((howto & RB_STRING) && bootstr != NULL) {
217 printf("loading a new kernel: %s\n", bootstr);
218 kloader_reboot_setup(bootstr);
219 }
220 }
221 #endif
222
223 boothowto = howto;
224 if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
225 waittime = 0;
226 vfs_shutdown();
227 }
228
229 /* Disable interrupts. */
230 splhigh();
231
232 /* Do a dump if requested. */
233 if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
234 dumpsys();
235
236 haltsys:
237 doshutdownhooks();
238
239 pmf_system_shutdown(boothowto);
240
241 if (howto & RB_HALT) {
242 printf("\n");
243 printf("The operating system has halted.\n");
244 printf("Please press any key to reboot.\n\n");
245 cngetc();
246 }
247
248 #ifdef KLOADER
249 else if ((howto & RB_STRING) && bootstr != NULL) {
250 kloader_reboot();
251 printf("\nFailed to load a new kernel.\n");
252 cngetc();
253 }
254 #endif
255
256 printf("rebooting...\n");
257 cpu_reset();
258 for(;;)
259 ;
260 /*NOTREACHED*/
261 }
262
263 void
intc_intr(int ssr,int spc,int ssp)264 intc_intr(int ssr, int spc, int ssp)
265 {
266 struct intc_intrhand *ih;
267 int evtcode;
268
269 curcpu()->ci_data.cpu_nintr++;
270
271 evtcode = _reg_read_4(SH4_INTEVT);
272
273 ih = EVTCODE_IH(evtcode);
274 KDASSERT(ih->ih_func);
275 /*
276 * On entry, all interrupts are disabled, and exception is enabled.
277 * Enable higher level interrupt here.
278 */
279 _cpu_intr_resume(ih->ih_level);
280
281 if (evtcode == SH_INTEVT_TMU0_TUNI0) { /* hardclock */
282 struct clockframe cf;
283 cf.spc = spc;
284 cf.ssr = ssr;
285 cf.ssp = ssp;
286 (*ih->ih_func)(&cf);
287 } else {
288 (*ih->ih_func)(ih->ih_arg);
289 }
290 }
291
292 #ifdef MODULAR
293 /*
294 * Push any modules loaded by the bootloader etc.
295 */
296 void
module_init_md(void)297 module_init_md(void)
298 {
299 }
300 #endif
301