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boot.c revision 1.5
      1 #define	DEBUG
      2 /*	$NetBSD: boot.c,v 1.5 2006/01/27 01:55:34 uwe Exp $	*/
      3 
      4 /*-
      5  * Copyright (c) 1997 The NetBSD Foundation, Inc.
      6  * All rights reserved.
      7  *
      8  * This code is derived from software contributed to The NetBSD Foundation
      9  * by Jason R. Thorpe.
     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  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the NetBSD
     22  *	Foundation, Inc. and its contributors.
     23  * 4. Neither the name of The NetBSD Foundation nor the names of its
     24  *    contributors may be used to endorse or promote products derived
     25  *    from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     37  * POSSIBILITY OF SUCH DAMAGE.
     38  */
     39 
     40 /*
     41  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
     42  * Copyright (C) 1995, 1996 TooLs GmbH.
     43  * All rights reserved.
     44  *
     45  * Redistribution and use in source and binary forms, with or without
     46  * modification, are permitted provided that the following conditions
     47  * are met:
     48  * 1. Redistributions of source code must retain the above copyright
     49  *    notice, this list of conditions and the following disclaimer.
     50  * 2. Redistributions in binary form must reproduce the above copyright
     51  *    notice, this list of conditions and the following disclaimer in the
     52  *    documentation and/or other materials provided with the distribution.
     53  * 3. All advertising materials mentioning features or use of this software
     54  *    must display the following acknowledgement:
     55  *	This product includes software developed by TooLs GmbH.
     56  * 4. The name of TooLs GmbH may not be used to endorse or promote products
     57  *    derived from this software without specific prior written permission.
     58  *
     59  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
     60  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     61  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     62  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     63  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     64  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     65  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     66  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     67  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     68  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     69  */
     70 
     71 /*
     72  * First try for the boot code
     73  *
     74  * Input syntax is:
     75  *	[promdev[{:|,}partition]]/[filename] [flags]
     76  */
     77 
     78 #define	ELFSIZE		32		/* We use 32-bit ELF. */
     79 
     80 #include <sys/param.h>
     81 #include <sys/exec.h>
     82 #include <sys/exec_elf.h>
     83 #include <sys/reboot.h>
     84 #include <sys/disklabel.h>
     85 #include <sys/boot_flag.h>
     86 
     87 #include <lib/libsa/stand.h>
     88 #include <lib/libsa/loadfile.h>
     89 #include <lib/libkern/libkern.h>
     90 
     91 #include <machine/cpu.h>
     92 
     93 #include "cache.h"
     94 #include "extern.h"
     95 #include "ofdev.h"
     96 #include "openfirm.h"
     97 
     98 #ifdef DEBUG
     99 # define DPRINTF printf
    100 #else
    101 # define DPRINTF while (/*CONSTCOND*/0) printf
    102 #endif
    103 
    104 char bootdev[128];
    105 char bootfile[128];
    106 int boothowto;
    107 int debug;
    108 
    109 #ifdef notyet
    110 static int ofw_version = 0;
    111 #endif
    112 static const char *kernels[] = {
    113     "/netbsd", "/netbsd.gz", "/netbsd.shark", NULL
    114 };
    115 
    116 static void
    117 prom2boot(char *dev)
    118 {
    119 	char *cp, *ocp;
    120 
    121 	ocp = dev;
    122 	cp = dev + strlen(dev) - 1;
    123 	for (; cp >= ocp; cp--) {
    124 		if (*cp == ':') {
    125 			*cp = '\0';
    126 			return;
    127 		}
    128 	}
    129 }
    130 
    131 static void
    132 parseargs(char *str, int *howtop)
    133 {
    134 	char *cp;
    135 
    136 	/* Allow user to drop back to the PROM. */
    137 	if (strcmp(str, "exit") == 0)
    138 		OF_exit();
    139 
    140 	*howtop = 0;
    141 
    142 	for (cp = str; *cp; cp++)
    143 		if (*cp == ' ' || *cp == '-')
    144 			goto found;
    145 
    146 	return;
    147 
    148  found:
    149 	*cp++ = '\0';
    150 	while (*cp)
    151 		BOOT_FLAG(*cp++, *howtop);
    152 }
    153 
    154 static void
    155 chain(void (*entry)(int (*)(void *), void *, u_int), char *args, void *ssym,
    156     void *esym)
    157 {
    158 	extern char end[];
    159 	u_int l, magic = 0x19730224;
    160 
    161 	freeall();
    162 
    163 	/*
    164 	 * Stash pointer to start and end of symbol table after the argument
    165 	 * strings.
    166 	 */
    167 	l = strlen(args) + 1;
    168 	l = (l + 3) & ~3;			/* align */
    169 	DPRINTF("magic @ %p\n", args + l);
    170 	memcpy(args + l, &magic, sizeof(magic));
    171 	l += sizeof(magic);
    172 	DPRINTF("ssym @ %p\n", args + l);
    173 	memcpy(args + l, &ssym, sizeof(ssym));
    174 	l += sizeof(ssym);
    175 	DPRINTF("esym @ %p\n", args + l);
    176 	memcpy(args + l, &esym, sizeof(esym));
    177 	l += sizeof(esym);
    178 	DPRINTF("args + l -> %p\n", args + l);
    179 
    180 	DPRINTF("Calling OF_chain(%p, %tx, %p, %p, %u)\n",
    181 	    (void *)RELOC, end - (char *)RELOC, entry, args, l);
    182 	OF_chain((void *)RELOC, end - (char *)RELOC, entry, args, l);
    183 	panic("chain");
    184 }
    185 
    186 __dead void
    187 _rtt(void)
    188 {
    189 
    190 	OF_exit();
    191 }
    192 
    193 void
    194 main(void)
    195 {
    196 	extern char bootprog_name[], bootprog_rev[],
    197 		    bootprog_maker[], bootprog_date[];
    198 	int chosen;
    199 	char bootline[512];		/* Should check size? */
    200 	char *cp, *startbuf, *endbuf;
    201 	u_long marks[MARK_MAX], size;
    202 	u_int32_t entry;
    203 	void *ssym, *esym;
    204 
    205 	printf("\n");
    206 	printf(">> %s, Revision %s\n", bootprog_name, bootprog_rev);
    207 	printf(">> (%s, %s)\n", bootprog_maker, bootprog_date);
    208 
    209 	/*
    210 	 * Get the boot arguments from Openfirmware
    211 	 */
    212 	if ((chosen = OF_finddevice("/chosen")) == -1 ||
    213 	    OF_getprop(chosen, "bootpath", bootdev, sizeof bootdev) < 0 ||
    214 	    OF_getprop(chosen, "bootargs", bootline, sizeof bootline) < 0) {
    215 		printf("Invalid Openfirmware environment\n");
    216 		OF_exit();
    217 	}
    218 
    219 	prom2boot(bootdev);
    220 	parseargs(bootline, &boothowto);
    221 	DPRINTF("bootline=%s\n", bootline);
    222 
    223 	/*
    224 	 * Per the ARM OpenFirmware bindings, the firmware must
    225 	 * allocate and map at least 6MB of physical memory starting
    226 	 * at VA 0xf0000000.  We have been loaded at 0xf0000000,
    227 	 * and the memory after us has been unmapped and freed.
    228 	 * We expect to load the kernel at 0xf0100000, so we will
    229 	 * allocate 5MB of virtual memory starting there, and
    230 	 * unmap/free what we don't use.
    231 	 */
    232 	startbuf = OF_claim((void *) 0xf0100000, (5 * 1024 * 1024), 0);
    233 	if (startbuf != (void *) 0xf0100000) {
    234 		printf("Unable to claim buffer for kernel\n");
    235 		OF_exit();
    236 	}
    237 	endbuf = startbuf + (5 * 1024 * 1024);
    238 
    239 	for (;;) {
    240 		int i;
    241 
    242 		if (boothowto & RB_ASKNAME) {
    243 			printf("Boot: ");
    244 			gets(bootline);
    245 			parseargs(bootline, &boothowto);
    246 		}
    247 
    248 		if (bootline[0]) {
    249 			kernels[0] = bootline;
    250 			kernels[1] = NULL;
    251 		}
    252 
    253 		for (i = 0; kernels[i]; i++) {
    254 			DPRINTF("Trying %s\n", kernels[i]);
    255 
    256 			marks[MARK_START] = 0xf0100000;
    257 			if (loadfile(kernels[i], marks, LOAD_KERNEL) >= 0)
    258 				goto loaded;
    259 		}
    260 
    261 		boothowto |= RB_ASKNAME;
    262 	}
    263  loaded:
    264 	/*
    265 	 * Okay, kernel is loaded, free the extra memory at the end.
    266 	 * Round to the ARM OpenFirmare page size (4k).
    267 	 */
    268 	cp = (char *) ((marks[MARK_END] + 0xfff) & ~0xfff);
    269 	size = (u_long) (endbuf - cp);
    270 	if (size)
    271 		OF_release(cp, size);
    272 
    273 #ifdef	__notyet__
    274 	OF_setprop(chosen, "bootpath", opened_name, strlen(opened_name) + 1);
    275 	cp = bootline;
    276 #else
    277 	strcpy(bootline, opened_name);
    278 	cp = bootline + strlen(bootline);
    279 	*cp++ = ' ';
    280 #endif
    281 	*cp = '-';
    282 	if (boothowto & RB_ASKNAME)
    283 		*++cp = 'a';
    284 	if (boothowto & RB_SINGLE)
    285 		*++cp = 's';
    286 	if (boothowto & RB_KDB)
    287 		*++cp = 'd';
    288 	if (*cp == '-')
    289 #ifdef	__notyet__
    290 		*cp = 0;
    291 #else
    292 		*--cp = 0;
    293 #endif
    294 	else
    295 		*++cp = 0;
    296 #ifdef	__notyet__
    297 	OF_setprop(chosen, "bootargs", bootline, strlen(bootline) + 1);
    298 #endif
    299 
    300 	entry = marks[MARK_ENTRY];
    301 	ssym = (void *)marks[MARK_SYM];
    302 	esym = (void *)marks[MARK_END];
    303 
    304 	printf(" start=0x%x\n", entry);
    305 
    306 	if (cache_syncI != NULL) {
    307 		DPRINTF("Syncing I$...\n");
    308 		(*cache_syncI)();
    309 	}
    310 
    311 	chain((void *)entry, bootline, ssym, esym);
    312 
    313 	OF_exit();
    314 }
    315