1 /* $NetBSD: machdep.c,v 1.48 2026/04/08 04:06:40 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 1.48 2026/04/08 04:06:40 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 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 163 consinit(void) 164 { 165 static int initted; 166 167 if (initted) 168 return; 169 initted = 1; 170 171 cninit(); 172 } 173 174 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 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 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
Indexes created Sun Oct 25 00:26:45 UTC 2026