NetBSD-5.0.2/sys/arch/dreamcast/dreamcast/machdep.c
/* $NetBSD: machdep.c,v 1.36 2008/04/28 20:23:16 martin 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 1.36 2008/04/28 20:23:16 martin Exp $");
#include "opt_ddb.h"
#include "opt_kgdb.h"
#include "opt_memsize.h"
#include "scif.h"
#include "opt_kloader.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/user.h>
#include <sys/mount.h>
#include <sys/reboot.h>
#include <sys/sysctl.h>
#include <sys/ksyms.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 <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 NKSYMS || defined(DDB) || defined(LKM)
ksyms_init(0, NULL, NULL);
#endif
#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)
{
strcpy(cpu_model, "SEGA Dreamcast\n");
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();
/*
* If we've been adjusting the clock, the todr
* will be out of synch; adjust it now.
*/
#if 0
resettodr();
#endif
}
/* Disable interrupts. */
splhigh();
/* Do a dump if requested. */
if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP)
dumpsys();
haltsys:
doshutdownhooks();
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 s, evtcode;
evtcode = _reg_read_4(SH4_INTEVT);
ih = EVTCODE_IH(evtcode);
KDASSERT(ih->ih_func);
/*
* On entry, all interrrupts are disabled, and exception is enabled.
* Enable higher level interrupt here.
*/
s = _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);
}
}