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boot.c revision 1.8
      1 #define	DEBUG
      2 /*	$NetBSD: boot.c,v 1.8 2016/06/11 06:41:55 dholland 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  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
     35  * Copyright (C) 1995, 1996 TooLs GmbH.
     36  * All rights reserved.
     37  *
     38  * Redistribution and use in source and binary forms, with or without
     39  * modification, are permitted provided that the following conditions
     40  * are met:
     41  * 1. Redistributions of source code must retain the above copyright
     42  *    notice, this list of conditions and the following disclaimer.
     43  * 2. Redistributions in binary form must reproduce the above copyright
     44  *    notice, this list of conditions and the following disclaimer in the
     45  *    documentation and/or other materials provided with the distribution.
     46  * 3. All advertising materials mentioning features or use of this software
     47  *    must display the following acknowledgement:
     48  *	This product includes software developed by TooLs GmbH.
     49  * 4. The name of TooLs GmbH may not be used to endorse or promote products
     50  *    derived from this software without specific prior written permission.
     51  *
     52  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
     53  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     54  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     55  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     56  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     57  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     58  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     59  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     60  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     61  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     62  */
     63 
     64 /*
     65  * First try for the boot code
     66  *
     67  * Input syntax is:
     68  *	[promdev[{:|,}partition]]/[filename] [flags]
     69  */
     70 
     71 #define	ELFSIZE		32		/* We use 32-bit ELF. */
     72 
     73 #include <sys/param.h>
     74 #include <sys/exec.h>
     75 #include <sys/exec_elf.h>
     76 #include <sys/reboot.h>
     77 #include <sys/disklabel.h>
     78 #include <sys/boot_flag.h>
     79 
     80 #include <lib/libsa/stand.h>
     81 #include <lib/libsa/loadfile.h>
     82 #include <lib/libkern/libkern.h>
     83 
     84 #include <machine/cpu.h>
     85 
     86 #include "cache.h"
     87 #include "extern.h"
     88 #include "ofdev.h"
     89 #include "openfirm.h"
     90 
     91 #ifdef DEBUG
     92 # define DPRINTF printf
     93 #else
     94 # define DPRINTF while (/*CONSTCOND*/0) printf
     95 #endif
     96 
     97 char bootdev[128];
     98 char bootfile[128];
     99 int boothowto;
    100 int debug;
    101 
    102 #ifdef notyet
    103 static int ofw_version = 0;
    104 #endif
    105 static const char *kernels[] = {
    106     "/netbsd", "/netbsd.gz", "/netbsd.shark", NULL
    107 };
    108 
    109 static void
    110 prom2boot(char *dev)
    111 {
    112 	char *cp, *ocp;
    113 
    114 	ocp = dev;
    115 	cp = dev + strlen(dev) - 1;
    116 	for (; cp >= ocp; cp--) {
    117 		if (*cp == ':') {
    118 			*cp = '\0';
    119 			return;
    120 		}
    121 	}
    122 }
    123 
    124 static void
    125 parseargs(char *str, int *howtop)
    126 {
    127 	char *cp;
    128 
    129 	/* Allow user to drop back to the PROM. */
    130 	if (strcmp(str, "exit") == 0)
    131 		OF_exit();
    132 
    133 	*howtop = 0;
    134 
    135 	for (cp = str; *cp; cp++)
    136 		if (*cp == ' ' || *cp == '-')
    137 			goto found;
    138 
    139 	return;
    140 
    141  found:
    142 	*cp++ = '\0';
    143 	while (*cp)
    144 		BOOT_FLAG(*cp++, *howtop);
    145 }
    146 
    147 static void
    148 chain(void (*entry)(int (*)(void *), void *, u_int), char *args, void *ssym,
    149     void *esym)
    150 {
    151 	extern char end[];
    152 	u_int l, magic = 0x19730224;
    153 
    154 	freeall();
    155 
    156 	/*
    157 	 * Stash pointer to start and end of symbol table after the argument
    158 	 * strings.
    159 	 */
    160 	l = strlen(args) + 1;
    161 	l = (l + 3) & ~3;			/* align */
    162 	DPRINTF("magic @ %p\n", args + l);
    163 	memcpy(args + l, &magic, sizeof(magic));
    164 	l += sizeof(magic);
    165 	DPRINTF("ssym @ %p\n", args + l);
    166 	memcpy(args + l, &ssym, sizeof(ssym));
    167 	l += sizeof(ssym);
    168 	DPRINTF("esym @ %p\n", args + l);
    169 	memcpy(args + l, &esym, sizeof(esym));
    170 	l += sizeof(esym);
    171 	DPRINTF("args + l -> %p\n", args + l);
    172 
    173 	DPRINTF("Calling OF_chain(%p, %tx, %p, %p, %u)\n",
    174 	    (void *)RELOC, end - (char *)RELOC, entry, args, l);
    175 	OF_chain((void *)RELOC, end - (char *)RELOC, entry, args, l);
    176 	panic("chain");
    177 }
    178 
    179 __dead void
    180 _rtt(void)
    181 {
    182 
    183 	OF_exit();
    184 }
    185 
    186 void
    187 main(void)
    188 {
    189 	extern char bootprog_name[], bootprog_rev[];
    190 	int chosen;
    191 	char bootline[512];		/* Should check size? */
    192 	char *cp, *startbuf, *endbuf;
    193 	u_long marks[MARK_MAX], size;
    194 	u_int32_t entry;
    195 	void *ssym, *esym;
    196 
    197 	printf("\n");
    198 	printf(">> %s, Revision %s\n", bootprog_name, bootprog_rev);
    199 
    200 	/*
    201 	 * Get the boot arguments from Openfirmware
    202 	 */
    203 	if ((chosen = OF_finddevice("/chosen")) == -1 ||
    204 	    OF_getprop(chosen, "bootpath", bootdev, sizeof bootdev) < 0 ||
    205 	    OF_getprop(chosen, "bootargs", bootline, sizeof bootline) < 0) {
    206 		printf("Invalid Openfirmware environment\n");
    207 		OF_exit();
    208 	}
    209 
    210 	prom2boot(bootdev);
    211 	parseargs(bootline, &boothowto);
    212 	DPRINTF("bootline=%s\n", bootline);
    213 
    214 	/*
    215 	 * Per the ARM OpenFirmware bindings, the firmware must
    216 	 * allocate and map at least 6MB of physical memory starting
    217 	 * at VA 0xf0000000.  We have been loaded at 0xf0000000,
    218 	 * and the memory after us has been unmapped and freed.
    219 	 * We expect to load the kernel at 0xf0100000, so we will
    220 	 * allocate 5MB of virtual memory starting there, and
    221 	 * unmap/free what we don't use.
    222 	 */
    223 	startbuf = OF_claim((void *) 0xf0100000, (5 * 1024 * 1024), 0);
    224 	if (startbuf != (void *) 0xf0100000) {
    225 		printf("Unable to claim buffer for kernel\n");
    226 		OF_exit();
    227 	}
    228 	endbuf = startbuf + (5 * 1024 * 1024);
    229 
    230 	for (;;) {
    231 		int i;
    232 
    233 		if (boothowto & RB_ASKNAME) {
    234 			printf("Boot: ");
    235 			kgets(bootline, sizeof(bootline));
    236 			parseargs(bootline, &boothowto);
    237 		}
    238 
    239 		if (bootline[0]) {
    240 			kernels[0] = bootline;
    241 			kernels[1] = NULL;
    242 		}
    243 
    244 		for (i = 0; kernels[i]; i++) {
    245 			DPRINTF("Trying %s\n", kernels[i]);
    246 
    247 			marks[MARK_START] = 0xf0100000;
    248 			if (loadfile(kernels[i], marks, LOAD_KERNEL) >= 0)
    249 				goto loaded;
    250 		}
    251 
    252 		boothowto |= RB_ASKNAME;
    253 	}
    254  loaded:
    255 	/*
    256 	 * Okay, kernel is loaded, free the extra memory at the end.
    257 	 * Round to the ARM OpenFirmare page size (4k).
    258 	 */
    259 	cp = (char *) ((marks[MARK_END] + 0xfff) & ~0xfff);
    260 	size = (u_long) (endbuf - cp);
    261 	if (size)
    262 		OF_release(cp, size);
    263 
    264 #ifdef	__notyet__
    265 	OF_setprop(chosen, "bootpath", opened_name, strlen(opened_name) + 1);
    266 	cp = bootline;
    267 #else
    268 	strcpy(bootline, opened_name);
    269 	cp = bootline + strlen(bootline);
    270 	*cp++ = ' ';
    271 #endif
    272 	*cp = '-';
    273 	if (boothowto & RB_ASKNAME)
    274 		*++cp = 'a';
    275 	if (boothowto & RB_SINGLE)
    276 		*++cp = 's';
    277 	if (boothowto & RB_KDB)
    278 		*++cp = 'd';
    279 	if (*cp == '-')
    280 #ifdef	__notyet__
    281 		*cp = 0;
    282 #else
    283 		*--cp = 0;
    284 #endif
    285 	else
    286 		*++cp = 0;
    287 #ifdef	__notyet__
    288 	OF_setprop(chosen, "bootargs", bootline, strlen(bootline) + 1);
    289 #endif
    290 
    291 	entry = marks[MARK_ENTRY];
    292 	ssym = (void *)marks[MARK_SYM];
    293 	esym = (void *)marks[MARK_END];
    294 
    295 	printf(" start=0x%x\n", entry);
    296 
    297 	if (cache_syncI != NULL) {
    298 		DPRINTF("Syncing I$...\n");
    299 		(*cache_syncI)();
    300 	}
    301 
    302 	chain((void *)entry, bootline, ssym, esym);
    303 
    304 	OF_exit();
    305 }
    306