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machdep.c revision 1.15 
      1 /*	$NetBSD: machdep.c,v 1.15 2011/01/17 07:32:54 matt Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2006 Jachym Holecek
      5  * All rights reserved.
      6  *
      7  * Written for DFC Design, s.r.o.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  *
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  *
     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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Based on Walnut and Explora.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.15 2011/01/17 07:32:54 matt Exp $");
     38 
     39 #include "opt_compat_netbsd.h"
     40 #include "opt_ddb.h"
     41 #include "opt_ipkdb.h"
     42 #include "opt_modular.h"
     43 #include "opt_virtex.h"
     44 #include "opt_kgdb.h"
     45 
     46 #include <sys/param.h>
     47 #include <sys/buf.h>
     48 #include <sys/exec.h>
     49 #include <sys/malloc.h>
     50 #include <sys/mbuf.h>
     51 #include <sys/mount.h>
     52 #include <sys/msgbuf.h>
     53 #include <sys/proc.h>
     54 #include <sys/reboot.h>
     55 #include <sys/syscallargs.h>
     56 #include <sys/syslog.h>
     57 #include <sys/systm.h>
     58 #include <sys/kernel.h>
     59 #include <sys/boot_flag.h>
     60 #include <sys/ksyms.h>
     61 #include <sys/device.h>
     62 
     63 #include <uvm/uvm_extern.h>
     64 
     65 #include <net/netisr.h>
     66 
     67 #include <dev/cons.h>
     68 
     69 #include <machine/bus.h>
     70 #include <machine/powerpc.h>
     71 #include <machine/trap.h>
     72 #include <machine/pcb.h>
     73 
     74 #include <powerpc/spr.h>
     75 #include <powerpc/ibm4xx/spr.h>
     76 
     77 #include <evbppc/virtex/dcr.h>
     78 #include <evbppc/virtex/virtex.h>
     79 
     80 #include "ksyms.h"
     81 
     82 #if defined(DDB)
     83 #include <machine/db_machdep.h>
     84 #include <ddb/db_extern.h>
     85 #endif
     86 
     87 #if defined(KGDB)
     88 #include <sys/kgdb.h>
     89 #endif
     90 
     91 /*
     92  * Global variables used here and there
     93  */
     94 struct vm_map *phys_map = NULL;
     95 
     96 /*
     97  * This should probably be in autoconf!				XXX
     98  */
     99 char cpu_model[80];
    100 char machine[] = MACHINE;		/* from <machine/param.h> */
    101 char machine_arch[] = MACHINE_ARCH;	/* from <machine/param.h> */
    102 
    103 char bootpath[256];
    104 paddr_t msgbuf_paddr;
    105 vaddr_t msgbuf_vaddr;
    106 
    107 #if NKSYMS || defined(DDB) || defined(MODULAR)
    108 void *startsym, *endsym;
    109 #endif
    110 
    111 int lcsplx(int);
    112 void initppc(u_int, u_int);
    113 
    114 static void dumpsys(void);
    115 static void install_extint(void (*)(void));
    116 static void trapcpy(int, void *, size_t);
    117 
    118 
    119 /* These two live in powerpc/powerpc/trap_subr.S */
    120 extern int 		extint, extsize;
    121 extern u_long 		extint_call;
    122 
    123 extern int defaulttrap, defaultsize;
    124 extern int sctrap, scsize;
    125 extern int alitrap, alisize;
    126 extern int dsitrap, dsisize;
    127 extern int isitrap, isisize;
    128 extern int mchktrap, mchksize;
    129 extern int tlbimiss4xx, tlbim4size;
    130 extern int tlbdmiss4xx, tlbdm4size;
    131 extern int pitfitwdog, pitfitwdogsize;
    132 extern int debugtrap, debugsize;
    133 extern int errata51handler, errata51size;
    134 #ifdef DDB
    135 extern int ddblow, ddbsize;
    136 #endif
    137 #ifdef IPKDB
    138 extern int ipkdblow, ipkdbsize;
    139 #endif
    140 
    141 /* BSS segment start & end. */
    142 extern char 		edata[], end[];
    143 
    144 /* One region holds all memory, the other is terminator expected by 405 pmap. */
    145 #define MEMREGIONS 	2
    146 struct mem_region 	physmemr[MEMREGIONS];
    147 struct mem_region 	availmemr[MEMREGIONS];
    148 
    149 static struct {
    150 	int 	vector;
    151 	void 	*addr;
    152 	void 	*size;
    153 } traps[] = {
    154 	/* EXC_EXI handled by install_extint(). */
    155 	{ EXC_SC, 	&sctrap, 	&scsize 	},
    156 	{ EXC_ALI, 	&alitrap, 	&alisize 	},
    157 	{ EXC_DSI, 	&dsitrap, 	&dsisize 	},
    158 	{ EXC_ISI, 	&isitrap, 	&isisize 	},
    159 	{ EXC_MCHK, 	&mchktrap, 	&mchksize 	},
    160 	{ EXC_ITMISS, 	&tlbimiss4xx, 	&tlbim4size 	},
    161 	{ EXC_DTMISS, 	&tlbdmiss4xx, 	&tlbdm4size 	},
    162 
    163 	/* EXC_{PIT, FIT, WDOG} handlers are spaced by 0x10 bytes only.. */
    164 	{ EXC_PIT, 	&pitfitwdog, 	&pitfitwdogsize },
    165 	{ EXC_DEBUG, 	&debugtrap, 	&debugsize	},
    166 
    167 	/* PPC405GP Rev D errata item 51 */
    168 	{ EXC_DTMISS|EXC_ALI, &errata51handler, &errata51size },
    169 
    170 #if defined(DDB)
    171 	{ EXC_PGM, 	&ddblow, 	&ddbsize 	},
    172 #elif defined(IPKDB)
    173 	{ EXC_PGM, 	&ipkdblow, 	&ipkdbsize 	},
    174 #endif
    175 };
    176 
    177 /* Maximum TLB page size. */
    178 #define TLB_PG_SIZE 	(16*1024*1024)
    179 
    180 void
    181 initppc(u_int startkernel, u_int endkernel)
    182 {
    183 	struct cpu_info * const ci = curcpu();
    184 	u_int 			addr, memsize;
    185 	int 			exc, dbcr0, i;
    186 
    187         /* Initialize cache info for memcpy, memset, etc. */
    188         cpu_probe_cache();
    189 
    190 	memset(physmemr, 0, sizeof(physmemr)); 		/* [1].size = 0 */
    191 	memset(availmemr, 0, sizeof(availmemr)); 	/* [1].size = 0 */
    192 
    193 	memsize = (PHYSMEM * 1024 * 1024) & ~PGOFSET;
    194 
    195 	physmemr[0].start 	= 0;
    196 	physmemr[0].size 	= memsize;
    197 
    198 	availmemr[0].start 	= startkernel;
    199 	availmemr[0].size 	= memsize - availmemr[0].start;
    200 
    201 	/* Map kernel memory linearly. */
    202 	for (addr = 0; addr < endkernel; addr += TLB_PG_SIZE)
    203 		ppc4xx_tlb_reserve(addr, addr, TLB_PG_SIZE, TLB_EX);
    204 
    205 	/* Give design-specific code a hint for reserved mappings. */
    206 	virtex_machdep_init(roundup(memsize, TLB_PG_SIZE), TLB_PG_SIZE,
    207 	    physmemr, availmemr);
    208 
    209 	lwp0.l_cpu = ci;
    210 
    211 	curpcb = lwp_getpcb(&lwp0);
    212 	memset(curpcb, 0, sizeof(struct pcb));
    213 	curpcb->pcb_pm = pmap_kernel();
    214 
    215 	for (exc = EXC_RSVD; exc <= EXC_LAST; exc += 0x100)
    216 		trapcpy(exc, &defaulttrap, (size_t)&defaultsize);
    217 
    218 	for (i = 0; i < __arraycount(traps); i++)
    219 		trapcpy(traps[i].vector, traps[i].addr, (size_t)traps[i].size);
    220 
    221 	__syncicache((void *)EXC_RST, EXC_LAST - EXC_RST + 0x100);
    222 
    223 	/* set exception vector base */
    224 	mtspr(SPR_EVPR, 0);
    225 
    226 	/* handle trap instruction as PGM exception */
    227 	dbcr0 = mfspr(SPR_DBCR0) & ~DBCR0_TDE;
    228 	mtspr(SPR_DBCR0, dbcr0);
    229 
    230 	install_extint(ext_intr);
    231 
    232 	/* enable translation */
    233 	__asm volatile (
    234 	    "	mfmsr %0 	\n"
    235 	    "	ori %0,%0,%1 	\n"
    236 	    "	mtmsr %0 	\n"
    237 	    "   sync 		\n"
    238 	    "	isync		\n"
    239 	    : : "r"(0), "K"(PSL_IR | PSL_DR | PSL_ME));
    240 
    241 	/* now that we enabled MMU, we can map console */
    242 	consinit();
    243 
    244 	uvm_setpagesize();
    245 	pmap_bootstrap(startkernel, endkernel);
    246 
    247 #if NKSYMS || defined(DDB) || defined(MODULAR)
    248 	ksyms_addsyms_elf((int)((u_int)endsym - (u_int)startsym), startsym, endsym);
    249 #endif
    250 #ifdef DDB
    251 	if (boothowto & RB_KDB)
    252 		Debugger();
    253 #endif
    254 #ifdef IPKDB
    255 	/*
    256 	 * Now trap to IPKDB
    257 	 */
    258 	ipkdb_init();
    259 	if (boothowto & RB_KDB)
    260 		ipkdb_connect(0);
    261 #endif
    262 #ifdef KGDB
    263 	/*
    264 	 * Now trap to KGDB
    265 	 */
    266 	kgdb_connect(1);
    267 #endif /* KGDB */
    268 }
    269 
    270 /*
    271  * trapcpy:
    272  *
    273  * 	Install a trap vector. We cannot use memcpy because the
    274  * 	destination may be zero. Borrowed from Explora.
    275  */
    276 static void
    277 trapcpy(int dest, void *src, size_t len)
    278 {
    279 	uint32_t 		*dest_p = (void *)dest;
    280 	uint32_t 		*src_p = src;
    281 
    282 	while (len > 0) {
    283 		*dest_p++ = *src_p++;
    284 		len -= sizeof(uint32_t);
    285 	}
    286 }
    287 
    288 static void
    289 install_extint(void (*handler)(void))
    290 {
    291 	u_long 			offset = (u_long)handler - (u_long)&extint_call;
    292 
    293 #ifdef DIAGNOSTIC
    294 	if (offset > 0x1ffffff)
    295 		panic("install_extint: too far away");
    296 #endif
    297 
    298 	/* Patch branch target in EXC_EXI handler. */
    299 	extint_call = (extint_call & 0xfc000003) | offset;
    300 
    301 	memcpy((void *)EXC_EXI, &extint, (size_t)&extsize);
    302 	__syncicache((void *)&extint_call, sizeof(extint_call));
    303 	__syncicache((void *)EXC_EXI, (int)&extsize);
    304 }
    305 
    306 /*
    307  * Machine dependent startup code.
    308  */
    309 
    310 char msgbuf[MSGBUFSIZE];
    311 
    312 void
    313 cpu_startup(void)
    314 {
    315 	/* For use by propdb. */
    316 	static u_int 	memsize = PHYSMEM * 1024 * 1024;
    317 	static u_int 	cpuspeed = CPUFREQ * 1000 * 1000;
    318 	prop_number_t 	pn;
    319 
    320 	vaddr_t 	minaddr, maxaddr;
    321 	char 		pbuf[9];
    322 
    323 	curcpu()->ci_khz = cpuspeed / 1000;
    324 
    325 	/* Initialize error message buffer. */
    326 	initmsgbuf((void *)msgbuf, round_page(MSGBUFSIZE));
    327 
    328 	printf("%s%s", copyright, version);
    329 
    330 	format_bytes(pbuf, sizeof(pbuf), ctob(physmem));
    331 	printf("total memory = %s\n", pbuf);
    332 
    333 	minaddr = 0;
    334 	/*
    335 	 * Allocate a submap for physio
    336 	 */
    337 	phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
    338 				 VM_PHYS_SIZE, 0, false, NULL);
    339 
    340 	/*
    341 	 * No need to allocate an mbuf cluster submap.  Mbuf clusters
    342 	 * are allocated via the pool allocator, and we use direct-mapped
    343 	 * pool pages.
    344 	 */
    345 
    346 	format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free));
    347 	printf("avail memory = %s\n", pbuf);
    348 
    349 	/*
    350 	 * Set up the board properties database.
    351 	 */
    352 	board_info_init();
    353 
    354 	pn = prop_number_create_integer(memsize);
    355 	KASSERT(pn != NULL);
    356 	if (prop_dictionary_set(board_properties, "mem-size", pn) == false)
    357 		panic("setting mem-size");
    358 	prop_object_release(pn);
    359 
    360 	pn = prop_number_create_integer(cpuspeed);
    361 	KASSERT(pn != NULL);
    362 	if (prop_dictionary_set(board_properties, "processor-frequency",
    363 	    pn) == false)
    364 		panic("setting processor-frequency");
    365 	prop_object_release(pn);
    366 
    367 	/*
    368 	 * Now that we have VM, malloc()s are OK in bus_space.
    369 	 */
    370 	bus_space_mallocok();
    371 	fake_mapiodev = 0;
    372 }
    373 
    374 
    375 static void
    376 dumpsys(void)
    377 {
    378 	printf("dumpsys: TBD\n");
    379 }
    380 
    381 /* Hook used by 405 pmap module. */
    382 void
    383 mem_regions(struct mem_region **mem, struct mem_region **avail)
    384 {
    385 	*mem 	= physmemr;
    386 	*avail 	= availmemr;
    387 }
    388 
    389 /*
    390  * Halt or reboot the machine after syncing/dumping according to howto.
    391  */
    392 void
    393 cpu_reboot(int howto, char *what)
    394 {
    395 	static int syncing;
    396 	static char str[256];
    397 	char *ap = str, *ap1 = ap;
    398 
    399 	boothowto = howto;
    400 	if (!cold && !(howto & RB_NOSYNC) && !syncing) {
    401 		syncing = 1;
    402 		vfs_shutdown();		/* sync */
    403 		resettodr();		/* set wall clock */
    404 	}
    405 
    406 	splhigh();
    407 
    408 	if (!cold && (howto & RB_DUMP))
    409 		dumpsys();
    410 
    411 	doshutdownhooks();
    412 
    413 	pmf_system_shutdown(boothowto);
    414 
    415 	if ((howto & RB_POWERDOWN) == RB_POWERDOWN) {
    416 		/* Power off here if we know how...*/
    417 	}
    418 
    419 	if (howto & RB_HALT) {
    420 		printf("halted\n\n");
    421 
    422 		goto reboot;	/* XXX for now... */
    423 
    424 #ifdef DDB
    425 		printf("dropping to debugger\n");
    426 		while(1)
    427 			Debugger();
    428 #endif
    429 #ifdef KGDB
    430 		printf("dropping to kgdb\n");
    431 		while(1)
    432 			kgdb_connect(1);
    433 #endif
    434 	}
    435 
    436 	printf("rebooting\n\n");
    437 	if (what && *what) {
    438 		if (strlen(what) > sizeof str - 5)
    439 			printf("boot string too large, ignored\n");
    440 		else {
    441 			strcpy(str, what);
    442 			ap1 = ap = str + strlen(str);
    443 			*ap++ = ' ';
    444 		}
    445 	}
    446 	*ap++ = '-';
    447 	if (howto & RB_SINGLE)
    448 		*ap++ = 's';
    449 	if (howto & RB_KDB)
    450 		*ap++ = 'd';
    451 	*ap++ = 0;
    452 	if (ap[-2] == '-')
    453 		*ap1 = 0;
    454 
    455 	/* flush cache for msgbuf */
    456 	__syncicache((void *)msgbuf_paddr, round_page(MSGBUFSIZE));
    457 
    458  reboot:
    459 	ppc4xx_reset();
    460 
    461 	printf("ppc4xx_reset() failed!\n");
    462 #ifdef DDB
    463 	while(1)
    464 		Debugger();
    465 #endif
    466 #ifdef KGDB
    467 	while(1)
    468 		kgdb_connect(1);
    469 #else
    470 	while (1)
    471 		/* nothing */;
    472 #endif
    473 }
    474 
    475 int
    476 lcsplx(int ipl)
    477 {
    478 	return spllower(ipl); 	/* XXX */
    479 }
    480