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machdep.c revision 1.91 
      1 /* $NetBSD: machdep.c,v 1.91 2012/07/28 17:33:53 tsutsui Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tohru Nishimura.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     33 
     34 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.91 2012/07/28 17:33:53 tsutsui Exp $");
     35 
     36 #include "opt_ddb.h"
     37 #include "opt_kgdb.h"
     38 #include "opt_compat_sunos.h"
     39 #include "opt_modular.h"
     40 #include "opt_panicbutton.h"
     41 #include "opt_m68k_arch.h"
     42 
     43 #include <sys/param.h>
     44 #include <sys/systm.h>
     45 #include <sys/kernel.h>
     46 #include <sys/proc.h>
     47 #include <sys/buf.h>
     48 #include <sys/reboot.h>
     49 #include <sys/conf.h>
     50 #include <sys/file.h>
     51 #include <sys/device.h>
     52 #include <sys/malloc.h>
     53 #include <sys/mbuf.h>
     54 #include <sys/msgbuf.h>
     55 #include <sys/ioctl.h>
     56 #include <sys/tty.h>
     57 #include <sys/mount.h>
     58 #include <sys/exec.h>
     59 #include <sys/exec_aout.h>		/* for MID_* */
     60 #include <sys/core.h>
     61 #include <sys/kauth.h>
     62 #include <sys/kcore.h>
     63 #include <sys/vnode.h>
     64 #include <sys/syscallargs.h>
     65 #include <sys/ksyms.h>
     66 #include <sys/module.h>
     67 #ifdef	KGDB
     68 #include <sys/kgdb.h>
     69 #endif
     70 #include <sys/boot_flag.h>
     71 
     72 #include <uvm/uvm_extern.h>
     73 
     74 #include <sys/sysctl.h>
     75 
     76 #include <machine/cpu.h>
     77 #include <machine/reg.h>
     78 #include <machine/pcb.h>
     79 #include <machine/psl.h>
     80 #include <machine/pte.h>
     81 #include <machine/kcore.h>	/* XXX should be pulled in by sys/kcore.h */
     82 
     83 #include <dev/cons.h>
     84 #include <dev/mm.h>
     85 
     86 #if defined(DDB)
     87 #include <machine/db_machdep.h>
     88 #include <ddb/db_sym.h>
     89 #include <ddb/db_extern.h>
     90 #endif
     91 
     92 #include "ksyms.h"
     93 
     94 /*
     95  * Info for CTL_HW
     96  */
     97 char	machine[] = MACHINE;
     98 char	cpu_model[120];
     99 
    100 /* Our exported CPU info; we can have only one. */
    101 struct cpu_info cpu_info_store;
    102 
    103 struct vm_map *phys_map = NULL;
    104 
    105 int	maxmem;			/* max memory per process */
    106 int	physmem;		/* set by locore */
    107 
    108 extern	u_int lowram;
    109 
    110 void luna68k_init(void);
    111 void identifycpu(void);
    112 void dumpsys(void);
    113 
    114 void straytrap(int, u_short);
    115 void nmihand(struct frame);
    116 
    117 int  cpu_dumpsize(void);
    118 int  cpu_dump(int (*)(dev_t, daddr_t, void *, size_t), daddr_t *);
    119 void cpu_init_kcore_hdr(void);
    120 
    121 /*
    122  * Machine-independent crash dump header info.
    123  */
    124 cpu_kcore_hdr_t cpu_kcore_hdr;
    125 
    126 int	machtype;	/* model: 1 for LUNA-1, 2 for LUNA-2 */
    127 int	sysconsole;	/* console: 0 for ttya, 1 for video */
    128 
    129 extern struct consdev syscons;
    130 extern void omfb_cnattach(void);
    131 extern void ws_cnattach(void);
    132 extern void syscnattach(int);
    133 
    134 /*
    135  * On the 68020/68030, the value of delay_divisor is roughly
    136  * 2048 / cpuspeed (where cpuspeed is in MHz).
    137  *
    138  * On the 68040/68060(?), the value of delay_divisor is roughly
    139  * 759 / cpuspeed (where cpuspeed is in MHz).
    140  * XXX -- is the above formula correct?
    141  */
    142 int	cpuspeed = 25;		/* only used for printing later */
    143 int	delay_divisor = 30;	/* for delay() loop count */
    144 
    145 /*
    146  * Early initialization, before main() is called.
    147  */
    148 void
    149 luna68k_init(void)
    150 {
    151 	volatile uint8_t *pio0 = (void *)0x49000000;
    152 	int sw1, i;
    153 	char *cp;
    154 	extern char bootarg[64];
    155 
    156 	extern paddr_t avail_start, avail_end;
    157 
    158 	/*
    159 	 * Tell the VM system about available physical memory.  The
    160 	 * luna68k only has one segment.
    161 	 */
    162 	uvm_page_physload(atop(avail_start), atop(avail_end),
    163 	    atop(avail_start), atop(avail_end), VM_FREELIST_DEFAULT);
    164 
    165 	/*
    166 	 * Initialize error message buffer (at end of core).
    167 	 * avail_end was pre-decremented in pmap_bootstrap to compensate.
    168 	 */
    169 	for (i = 0; i < btoc(MSGBUFSIZE); i++)
    170 		pmap_kenter_pa((vaddr_t)msgbufaddr + i * PAGE_SIZE,
    171 		    avail_end + i * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, 0);
    172 	pmap_update(pmap_kernel());
    173 	initmsgbuf(msgbufaddr, m68k_round_page(MSGBUFSIZE));
    174 
    175 
    176 	pio0[3] = 0xb6;
    177 	pio0[2] = 1 << 6;		/* enable parity check */
    178 	pio0[3] = 0xb6;
    179 	sw1 = pio0[0];			/* dip sw1 value */
    180 	sw1 ^= 0xff;
    181 	sysconsole = !(sw1 & 0x2);	/* console selection */
    182 
    183 	boothowto = 0;
    184 	i = 0;
    185 	/*
    186 	 * 'bootarg' on LUNA has:
    187 	 *   "<args of x command> ENADDR=<addr> HOST=<host> SERVER=<name>"
    188 	 * where <addr> is MAC address of which network loader used (not
    189 	 * necessarily same as one at 0x4101.FFE0), <host> and <name>
    190 	 * are the values of HOST and SERVER environment variables.
    191 	 *
    192 	 * 'bootarg' on LUNA-II has "<args of x command>" only.
    193 	 *
    194 	 * NetBSD/luna68k cares only the first argment; any of "sda".
    195 	 */
    196 	for (cp = bootarg; *cp != ' ' && *cp != 0; cp++) {
    197 		BOOT_FLAG(*cp, boothowto);
    198 		if (i++ >= sizeof(bootarg))
    199 			break;
    200 	}
    201 #if 0 /* overload 1:sw1, which now means 'go ROM monitor' after poweron */
    202 	if (boothowto == 0)
    203 		boothowto = (sw1 & 0x1) ? RB_SINGLE : 0;
    204 #endif
    205 }
    206 
    207 /*
    208  * Console initialization: called early on from main,
    209  */
    210 void
    211 consinit(void)
    212 {
    213 
    214 	if (sysconsole == 0)
    215 		syscnattach(0);
    216 	else {
    217 		omfb_cnattach();
    218 		ws_cnattach();
    219 	}
    220 
    221 #if NKSYMS || defined(DDB) || defined(MODULAR)
    222 	{
    223 		extern char end[];
    224 		extern int *esym;
    225 
    226 		ksyms_addsyms_elf(*(int *)&end, ((int *)&end) + 1, esym);
    227 	}
    228 #endif
    229 #ifdef DDB
    230 	if (boothowto & RB_KDB)
    231 		cpu_Debugger();
    232 #endif
    233 }
    234 
    235 /*
    236  * cpu_startup: allocate memory for variable-sized tables.
    237  */
    238 void
    239 cpu_startup(void)
    240 {
    241 	vaddr_t minaddr, maxaddr;
    242 	char pbuf[9];
    243 	extern void greeting(void);
    244 
    245 	if (fputype != FPU_NONE)
    246 		m68k_make_fpu_idle_frame();
    247 
    248 	/*
    249 	 * Initialize the kernel crash dump header.
    250 	 */
    251 	cpu_init_kcore_hdr();
    252 
    253 	/*
    254 	 * Good {morning,afternoon,evening,night}.
    255 	 */
    256 	printf("%s%s", copyright, version);
    257 	identifycpu();
    258 
    259 	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
    260 	printf("total memory = %s\n", pbuf);
    261 
    262 	minaddr = 0;
    263 
    264 	/*
    265 	 * Allocate a submap for physio
    266 	 */
    267 	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
    268 	    VM_PHYS_SIZE, 0, false, NULL);
    269 
    270 	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
    271 	printf("avail memory = %s\n", pbuf);
    272 
    273 	/*
    274 	 * Say "Hi" to the world
    275 	 */
    276 	greeting();
    277 }
    278 
    279 void
    280 identifycpu(void)
    281 {
    282 	extern int cputype;
    283 	const char *model, *fpu;
    284 
    285 	memset(cpu_model, 0, sizeof(cpu_model));
    286 	switch (cputype) {
    287 	case CPU_68030:
    288 		model ="LUNA-I";
    289 		switch (fputype) {
    290 		case FPU_68881:
    291 			fpu = "MC68881";
    292 			break;
    293 		case FPU_68882:
    294 			fpu = "MC68882";
    295 			break;
    296 		case FPU_NONE:
    297 			fpu = "no";
    298 			break;
    299 		default:
    300 			fpu = "unknown";
    301 			break;
    302 		}
    303 		snprintf(cpu_model, sizeof(cpu_model),
    304 		    "%s (MC68030 CPU+MMU, %s FPU)", model, fpu);
    305 		machtype = LUNA_I;
    306 		/* 20MHz 68030 */
    307 		cpuspeed = 20;
    308 		delay_divisor = 102;
    309 		hz = 60;
    310 		break;
    311 #if defined(M68040)
    312 	case CPU_68040:
    313 		model ="LUNA-II";
    314 		snprintf(cpu_model, sizeof(cpu_model),
    315 		    "%s (MC68040 CPU+MMU+FPU, 4k on-chip physical I/D caches)",
    316 		    model);
    317 		machtype = LUNA_II;
    318 		/* 25MHz 68040 */
    319 		cpuspeed = 25;
    320 		delay_divisor = 30;
    321 		/* hz = 100 on LUNA-II */
    322 		break;
    323 #endif
    324 	default:
    325 		panic("unknown CPU type");
    326 	}
    327 	printf("%s\n", cpu_model);
    328 }
    329 
    330 /*
    331  * machine dependent system variables.
    332  */
    333 SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup")
    334 {
    335 
    336 	sysctl_createv(clog, 0, NULL, NULL,
    337 		       CTLFLAG_PERMANENT,
    338 		       CTLTYPE_NODE, "machdep", NULL,
    339 		       NULL, 0, NULL, 0,
    340 		       CTL_MACHDEP, CTL_EOL);
    341 
    342 	sysctl_createv(clog, 0, NULL, NULL,
    343 		       CTLFLAG_PERMANENT,
    344 		       CTLTYPE_STRUCT, "console_device", NULL,
    345 		       sysctl_consdev, 0, NULL, sizeof(dev_t),
    346 		       CTL_MACHDEP, CPU_CONSDEV, CTL_EOL);
    347 }
    348 
    349 int	waittime = -1;
    350 
    351 void
    352 cpu_reboot(int howto, char *bootstr)
    353 {
    354 	struct pcb *pcb = lwp_getpcb(curlwp);
    355 	extern void doboot(void);
    356 
    357 	/* take a snap shot before clobbering any registers */
    358 	if (pcb != NULL)
    359 		savectx(pcb);
    360 
    361 	/* If system is hold, just halt. */
    362 	if (cold) {
    363 		howto |= RB_HALT;
    364 		goto haltsys;
    365 	}
    366 
    367 	boothowto = howto;
    368 	if ((howto & RB_NOSYNC) == 0 && waittime < 0) {
    369 		waittime = 0;
    370 		vfs_shutdown();
    371 		/*
    372 		 * If we've been adjusting the clock, the todr
    373 		 * will be out of synch; adjust it now.
    374 		 */
    375 		resettodr();
    376 	}
    377 
    378 	/* Disable interrupts. */
    379 	splhigh();
    380 
    381 	/* If rebooting and a dump is requested, do it. */
    382 	if (howto & RB_DUMP)
    383 		dumpsys();
    384 
    385 haltsys:
    386 	/* Run any shutdown hooks. */
    387 	doshutdownhooks();
    388 
    389 	pmf_system_shutdown(boothowto);
    390 
    391 	/* Finally, halt/reboot the system. */
    392 	if ((howto & RB_POWERDOWN) == RB_POWERDOWN) {
    393 		volatile uint8_t *pio = (void *)0x4d000000;
    394 
    395 		printf("power is going down.\n");
    396 		DELAY(100000);
    397 		pio[3] = 0x94;
    398 		pio[2] = 0 << 4;
    399 		for (;;)
    400 			/* NOP */;
    401 	}
    402 	if (howto & RB_HALT) {
    403 		printf("System halted.	Hit any key to reboot.\n\n");
    404 		(void)cngetc();
    405 	}
    406 
    407 	printf("rebooting...\n");
    408 	DELAY(100000);
    409 	doboot();
    410 	/*NOTREACHED*/
    411 	for (;;)
    412 		;
    413 }
    414 
    415 /*
    416  * Initialize the kernel crash dump header.
    417  */
    418 void
    419 cpu_init_kcore_hdr(void)
    420 {
    421 	cpu_kcore_hdr_t *h = &cpu_kcore_hdr;
    422 	struct m68k_kcore_hdr *m = &h->un._m68k;
    423 	extern char end[];
    424 
    425 	memset(&cpu_kcore_hdr, 0, sizeof(cpu_kcore_hdr));
    426 
    427 	/*
    428 	 * Initialize the `dispatcher' portion of the header.
    429 	 */
    430 	strcpy(h->name, machine);
    431 	h->page_size = PAGE_SIZE;
    432 	h->kernbase = KERNBASE;
    433 
    434 	/*
    435 	 * Fill in information about our MMU configuration.
    436 	 */
    437 	m->mmutype	= mmutype;
    438 	m->sg_v		= SG_V;
    439 	m->sg_frame	= SG_FRAME;
    440 	m->sg_ishift	= SG_ISHIFT;
    441 	m->sg_pmask	= SG_PMASK;
    442 	m->sg40_shift1	= SG4_SHIFT1;
    443 	m->sg40_mask2	= SG4_MASK2;
    444 	m->sg40_shift2	= SG4_SHIFT2;
    445 	m->sg40_mask3	= SG4_MASK3;
    446 	m->sg40_shift3	= SG4_SHIFT3;
    447 	m->sg40_addr1	= SG4_ADDR1;
    448 	m->sg40_addr2	= SG4_ADDR2;
    449 	m->pg_v		= PG_V;
    450 	m->pg_frame	= PG_FRAME;
    451 
    452 	/*
    453 	 * Initialize pointer to kernel segment table.
    454 	 */
    455 	m->sysseg_pa = (uint32_t)(pmap_kernel()->pm_stpa);
    456 
    457 	/*
    458 	 * Initialize relocation value such that:
    459 	 *
    460 	 *	pa = (va - KERNBASE) + reloc
    461 	 *
    462 	 * Since we're linked and loaded at the same place,
    463 	 * and the kernel is mapped va == pa, this is 0.
    464 	 */
    465 	m->reloc = 0;
    466 
    467 	/*
    468 	 * Define the end of the relocatable range.
    469 	 */
    470 	m->relocend = (uint32_t)end;
    471 
    472 	/*
    473 	 * The luna68k has one contiguous memory segment.
    474 	 */
    475 	m->ram_segs[0].start = 0 /* lowram */;
    476 	m->ram_segs[0].size  = ctob(physmem);
    477 }
    478 
    479 /*
    480  * Compute the size of the machine-dependent crash dump header.
    481  * Returns size in disk blocks.
    482  */
    483 
    484 #define CHDRSIZE (ALIGN(sizeof(kcore_seg_t)) + ALIGN(sizeof(cpu_kcore_hdr_t)))
    485 #define MDHDRSIZE roundup(CHDRSIZE, dbtob(1))
    486 
    487 int
    488 cpu_dumpsize(void)
    489 {
    490 
    491 	return btodb(MDHDRSIZE);
    492 }
    493 
    494 /*
    495  * Called by dumpsys() to dump the machine-dependent header.
    496  */
    497 int
    498 cpu_dump(int (*dump)(dev_t, daddr_t, void *, size_t), daddr_t *blknop)
    499 {
    500 	int buf[MDHDRSIZE / sizeof(int)];
    501 	cpu_kcore_hdr_t *chdr;
    502 	kcore_seg_t *kseg;
    503 	int error;
    504 
    505 	kseg = (kcore_seg_t *)buf;
    506 	chdr = (cpu_kcore_hdr_t *)&buf[ALIGN(sizeof(kcore_seg_t)) /
    507 	    sizeof(int)];
    508 
    509 	/* Create the segment header. */
    510 	CORE_SETMAGIC(*kseg, KCORE_MAGIC, MID_MACHINE, CORE_CPU);
    511 	kseg->c_size = MDHDRSIZE - ALIGN(sizeof(kcore_seg_t));
    512 
    513 	memcpy(chdr, &cpu_kcore_hdr, sizeof(cpu_kcore_hdr_t));
    514 	error = (*dump)(dumpdev, *blknop, (void *)buf, sizeof(buf));
    515 	*blknop += btodb(sizeof(buf));
    516 	return error;
    517 }
    518 
    519 /*
    520  * These variables are needed by /sbin/savecore
    521  */
    522 uint32_t dumpmag = 0x8fca0101;	/* magic number */
    523 int	dumpsize = 0;		/* pages */
    524 long	dumplo = 0;		/* blocks */
    525 
    526 /*
    527  * This is called by main to set dumplo and dumpsize.
    528  * Dumps always skip the first PAGE_SIZE of disk space
    529  * in case there might be a disk label stored there.
    530  * If there is extra space, put dump at the end to
    531  * reduce the chance that swapping trashes it.
    532  */
    533 void
    534 cpu_dumpconf(void)
    535 {
    536 	int chdrsize;	/* size of dump header */
    537 	int nblks;	/* size of dump area */
    538 
    539 	if (dumpdev == NODEV)
    540 		return;
    541 	nblks = bdev_size(dumpdev);
    542 	chdrsize = cpu_dumpsize();
    543 
    544 	dumpsize = btoc(cpu_kcore_hdr.un._m68k.ram_segs[0].size);
    545 
    546 	/*
    547 	 * Check do see if we will fit.  Note we always skip the
    548 	 * first PAGE_SIZE in case there is a disk label there.
    549 	 */
    550 	if (nblks < (ctod(dumpsize) + chdrsize + ctod(1))) {
    551 		dumpsize = 0;
    552 		dumplo = -1;
    553 		return;
    554 	}
    555 
    556 	/*
    557 	 * Put dump at the end of the partition.
    558 	 */
    559 	dumplo = (nblks - 1) - ctod(dumpsize) - chdrsize;
    560 }
    561 
    562 /*
    563  * Dump physical memory onto the dump device.  Called by cpu_reboot().
    564  */
    565 void
    566 dumpsys(void)
    567 {
    568 	const struct bdevsw *bdev;
    569 	daddr_t blkno;		/* current block to write */
    570 				/* dump routine */
    571 	int (*dump)(dev_t, daddr_t, void *, size_t);
    572 	int pg;			/* page being dumped */
    573 	paddr_t maddr;		/* PA being dumped */
    574 	int error;		/* error code from (*dump)() */
    575 
    576 	/* XXX initialized here because of gcc lossage */
    577 	maddr = 0 /* lowram */;
    578 	pg = 0;
    579 
    580 	/* Make sure dump device is valid. */
    581 	if (dumpdev == NODEV)
    582 		return;
    583 	bdev = bdevsw_lookup(dumpdev);
    584 	if (bdev == NULL)
    585 		return;
    586 	if (dumpsize == 0) {
    587 		cpu_dumpconf();
    588 		if (dumpsize == 0)
    589 			return;
    590 	}
    591 	if (dumplo <= 0) {
    592 		printf("\ndump to dev %u,%u  not possible\n",
    593 		    major(dumpdev), minor(dumpdev));
    594 		return;
    595 	}
    596 	dump = bdev->d_dump;
    597 	blkno = dumplo;
    598 
    599 	printf("\ndumping to dev %u,%u offset %ld\n",
    600 	    major(dumpdev), minor(dumpdev), dumplo);
    601 
    602 	printf("dump ");
    603 
    604 	/* Write the dump header. */
    605 	error = cpu_dump(dump, &blkno);
    606 	if (error)
    607 		goto bad;
    608 
    609 	for (pg = 0; pg < dumpsize; pg++) {
    610 #define NPGMB	(1024*1024/PAGE_SIZE)
    611 		/* print out how many MBs we have dumped */
    612 		if (pg && (pg % NPGMB) == 0)
    613 			printf("%d ", pg / NPGMB);
    614 #undef NPGMB
    615 		pmap_enter(pmap_kernel(), (vaddr_t)vmmap, maddr,
    616 		    VM_PROT_READ, VM_PROT_READ|PMAP_WIRED);
    617 
    618 		pmap_update(pmap_kernel());
    619 		error = (*dump)(dumpdev, blkno, vmmap, PAGE_SIZE);
    620  bad:
    621 		switch (error) {
    622 		case 0:
    623 			maddr += PAGE_SIZE;
    624 			blkno += btodb(PAGE_SIZE);
    625 			break;
    626 
    627 		case ENXIO:
    628 			printf("device bad\n");
    629 			return;
    630 
    631 		case EFAULT:
    632 			printf("device not ready\n");
    633 			return;
    634 
    635 		case EINVAL:
    636 			printf("area improper\n");
    637 			return;
    638 
    639 		case EIO:
    640 			printf("i/o error\n");
    641 			return;
    642 
    643 		case EINTR:
    644 			printf("aborted from console\n");
    645 			return;
    646 
    647 		default:
    648 			printf("error %d\n", error);
    649 			return;
    650 		}
    651 	}
    652 	printf("succeeded\n");
    653 }
    654 
    655 void
    656 straytrap(int pc, u_short evec)
    657 {
    658 
    659 	printf("unexpected trap (vector offset %x) from %x\n",
    660 	    evec & 0xFFF, pc);
    661 }
    662 
    663 int	*nofault;
    664 
    665 int
    666 badaddr(register void *addr, int nbytes)
    667 {
    668 	register int i;
    669 	label_t faultbuf;
    670 
    671 #ifdef lint
    672 	i = *addr; if (i) return (0);
    673 #endif
    674 
    675 	nofault = (int *)&faultbuf;
    676 	if (setjmp((label_t *)nofault)) {
    677 		nofault = (int *)0;
    678 		return 1;
    679 	}
    680 
    681 	switch (nbytes) {
    682 	case 1:
    683 		i = *(volatile int8_t *)addr;
    684 		break;
    685 
    686 	case 2:
    687 		i = *(volatile int16_t *)addr;
    688 		break;
    689 
    690 	case 4:
    691 		i = *(volatile int32_t *)addr;
    692 		break;
    693 
    694 	default:
    695 		panic("badaddr: bad request");
    696 	}
    697 	nofault = (int *)0;
    698 	return 0;
    699 }
    700 
    701 void luna68k_abort(const char *);
    702 
    703 static int innmihand;	/* simple mutex */
    704 
    705 /*
    706  * Level 7 interrupts are caused by e.g. the ABORT switch.
    707  *
    708  * If we have DDB, then break into DDB on ABORT.  In a production
    709  * environment, bumping the ABORT switch would be bad, so we enable
    710  * panic'ing on ABORT with the kernel option "PANICBUTTON".
    711  */
    712 void
    713 nmihand(struct frame frame)
    714 {
    715 
    716 	/* Prevent unwanted recursion */
    717 	if (innmihand)
    718 		return;
    719 	innmihand = 1;
    720 
    721 	luna68k_abort("ABORT SWITCH");
    722 
    723 	innmihand = 0;
    724 }
    725 
    726 /*
    727  * Common code for handling ABORT signals from buttons, switches,
    728  * serial lines, etc.
    729  */
    730 void
    731 luna68k_abort(const char *cp)
    732 {
    733 
    734 #ifdef DDB
    735 	printf("%s\n", cp);
    736 	cpu_Debugger();
    737 #else
    738 #ifdef PANICBUTTON
    739 	panic(cp);
    740 #else
    741 	printf("%s ignored\n", cp);
    742 #endif /* PANICBUTTON */
    743 #endif /* DDB */
    744 }
    745 
    746 /*
    747  * cpu_exec_aout_makecmds():
    748  *	CPU-dependent a.out format hook for execve().
    749  *
    750  * Determine of the given exec package refers to something which we
    751  * understand and, if so, set up the vmcmds for it.
    752  */
    753 int
    754 cpu_exec_aout_makecmds(struct lwp *l, struct exec_package *epp)
    755 {
    756 	int error = ENOEXEC;
    757 #ifdef COMPAT_SUNOS
    758 	extern sunos_exec_aout_makecmds(struct proc *, struct exec_package *);
    759 
    760 	if ((error = sunos_exec_aout_makecmds(l->l_proc, epp)) == 0)
    761 		return 0;
    762 #endif
    763 	return error;
    764 }
    765 
    766 #ifdef MODULAR
    767 /*
    768  * Push any modules loaded by the bootloader etc.
    769  */
    770 void
    771 module_init_md(void)
    772 {
    773 }
    774 #endif
    775 
    776 #if 1
    777 
    778 struct consdev *cn_tab = &syscons;
    779 
    780 #else
    781 
    782 /*
    783  * romcons is useful until m68k TC register is initialized.
    784  */
    785 int  romcngetc(dev_t);
    786 void romcnputc(dev_t, int);
    787 
    788 struct consdev romcons = {
    789 	NULL,
    790 	NULL,
    791 	romcngetc,
    792 	romcnputc,
    793 	nullcnpollc,
    794 	makedev(7, 0), /* XXX */
    795 	CN_DEAD,
    796 };
    797 struct consdev *cn_tab = &romcons;
    798 
    799 #define __		((int **)0x41000000)
    800 #define GETC()		(*(int (*)())__[6])()
    801 #define PUTC(x)		(*(void (*)())__[7])(x)
    802 
    803 #define ROMPUTC(x) \
    804 ({					\
    805 	register _r;			\
    806 	__asm volatile ("			\
    807 		movc	%%vbr,%0	; \
    808 		movel	%0,%%sp@-	; \
    809 		clrl	%0		; \
    810 		movc	%0,%%vbr"	\
    811 		: "=r" (_r));		\
    812 	PUTC(x);			\
    813 	__asm volatile ("			\
    814 		movel	%%sp@+,%0	; \
    815 		movc	%0,%%vbr"	\
    816 		: "=r" (_r));		\
    817 })
    818 
    819 #define ROMGETC() \
    820 ({					\
    821 	register _r, _c;		\
    822 	__asm volatile ("			\
    823 		movc	%%vbr,%0	; \
    824 		movel	%0,%%sp@-	; \
    825 		clrl	%0		; \
    826 		movc	%0,%%vbr"	\
    827 		: "=r" (_r));		\
    828 	_c = GETC();			\
    829 	__asm volatile ("			\
    830 		movel	%%sp@+,%0	; \
    831 		movc	%0,%%vbr"	\
    832 		: "=r" (_r));		\
    833 	_c;				\
    834 })
    835 
    836 void
    837 romcnputc(dev_t dev, int c)
    838 {
    839 	int s;
    840 
    841 	s = splhigh();
    842 	ROMPUTC(c);
    843 	splx(s);
    844 }
    845 
    846 int
    847 romcngetc(dev_t dev)
    848 {
    849 	int s, c;
    850 
    851 	do {
    852 		s = splhigh();
    853 		c = ROMGETC();
    854 		splx(s);
    855 	} while (c == -1);
    856 	return c;
    857 }
    858 #endif
    859 
    860 int
    861 mm_md_physacc(paddr_t pa, vm_prot_t prot)
    862 {
    863 
    864 	return (pa < lowram || pa >= 0xfffffffc) ? EFAULT : 0;
    865 }
    866