/* $NetBSD: machdep.c,v 1.48 2026/04/08 04:06:40 thorpej Exp $ */ /*- * Copyright (c) 1996, 1997, 1998, 2002 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace * Simulation Facility, NASA Ames Research Center. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /*- * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)machdep.c 7.4 (Berkeley) 6/3/91 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.48 2026/04/08 04:06:40 thorpej Exp $"); #include "opt_ddb.h" #include "opt_kgdb.h" #include "opt_memsize.h" #include "scif.h" #include "opt_kloader.h" #include "opt_modular.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/mount.h> #include <sys/reboot.h> #include <sys/sysctl.h> #include <sys/ksyms.h> #include <sys/device.h> #include <sys/module.h> #include <sys/cpu.h> #ifdef KGDB #include <sys/kgdb.h> #include <sh3/dev/scifvar.h> #endif #ifdef DDB #include <machine/db_machdep.h> #include <ddb/db_extern.h> #endif #include <sh3/cpu.h> #include <sh3/exception.h> #include <sh3/bscreg.h> #include <machine/intr.h> #include <machine/kloader.h> #include <machine/pcb.h> #include <dev/cons.h> #include "ksyms.h" /* the following is used externally (sysctl_hw) */ char machine[] = MACHINE; /* dreamcast */ char machine_arch[] = MACHINE_ARCH; /* sh3el */ void main(void) __attribute__((__noreturn__)); void dreamcast_startup(void) __attribute__((__noreturn__)); void dreamcast_startup(void) { extern char edata[], end[]; paddr_t kernend; /* Clear bss */ memset(edata, 0, end - edata); /* Initialize CPU ops. */ sh_cpu_init(CPU_ARCH_SH4, CPU_PRODUCT_7750); /* Console */ consinit(); /* Load memory to UVM */ physmem = atop(IOM_RAM_SIZE); kernend = atop(round_page(SH3_P1SEG_TO_PHYS(end))); uvm_page_physload( kernend, atop(IOM_RAM_BEGIN + IOM_RAM_SIZE), kernend, atop(IOM_RAM_BEGIN + IOM_RAM_SIZE), VM_FREELIST_DEFAULT); /* Initialize proc0 u-area */ sh_proc0_init(); /* Initialize pmap and start to address translation */ pmap_bootstrap(); /* Debugger. */ #if defined(KGDB) && (NSCIF > 0) if (scif_kgdb_init() == 0) { kgdb_debug_init = 1; kgdb_connect(1); } #endif /* KGDB && NSCIF > 0 */ /* Jump to main */ __asm volatile( "jmp @%0;" "mov %1, sp" :: "r"(main),"r"(lwp0.l_md.md_pcb->pcb_sf.sf_r7_bank)); /* NOTREACHED */ while (1) ; } void consinit(void) { static int initted; if (initted) return; initted = 1; cninit(); } void cpu_startup(void) { cpu_setmodel("SEGA Dreamcast"); sh_startup(); } SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup") { sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "machdep", NULL, NULL, 0, NULL, 0, CTL_MACHDEP, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_STRUCT, "console_device", NULL, sysctl_consdev, 0, NULL, sizeof(dev_t), CTL_MACHDEP, CPU_CONSDEV, CTL_EOL); } void cpu_reboot(int howto, char *bootstr) { #ifdef KLOADER struct kloader_bootinfo kbi; #endif static int waittime = -1; if (cold) { howto |= RB_HALT; goto haltsys; } #ifdef KLOADER /* No bootinfo is required. */ kloader_bootinfo_set(&kbi, 0, NULL, NULL, true); if ((howto & RB_HALT) == 0) { if ((howto & RB_STRING) && bootstr != NULL) { printf("loading a new kernel: %s\n", bootstr); kloader_reboot_setup(bootstr); } } #endif boothowto = howto; if ((howto & RB_NOSYNC) == 0 && waittime < 0) { waittime = 0; vfs_shutdown(); } /* Disable interrupts. */ splhigh(); /* Do a dump if requested. */ if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP) dumpsys(); haltsys: doshutdownhooks(); pmf_system_shutdown(boothowto); if (howto & RB_HALT) { printf("\n"); printf("The operating system has halted.\n"); printf("Please press any key to reboot.\n\n"); cngetc(); } #ifdef KLOADER else if ((howto & RB_STRING) && bootstr != NULL) { kloader_reboot(); printf("\nFailed to load a new kernel.\n"); cngetc(); } #endif printf("rebooting...\n"); cpu_reset(); for(;;) ; /*NOTREACHED*/ } void intc_intr(int ssr, int spc, int ssp) { struct intc_intrhand *ih; int evtcode; curcpu()->ci_data.cpu_nintr++; evtcode = _reg_read_4(SH4_INTEVT); ih = EVTCODE_IH(evtcode); KDASSERT(ih->ih_func); /* * On entry, all interrupts are disabled, and exception is enabled. * Enable higher level interrupt here. */ _cpu_intr_resume(ih->ih_level); if (evtcode == SH_INTEVT_TMU0_TUNI0) { /* hardclock */ struct clockframe cf; cf.spc = spc; cf.ssr = ssr; cf.ssp = ssp; (*ih->ih_func)(&cf); } else { (*ih->ih_func)(ih->ih_arg); } }
