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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 
     27 #include <sys/param.h>
     28 #include <sys/sunddi.h>
     29 #include <sys/bootconf.h>
     30 #include <sys/bootvfs.h>
     31 #include <sys/filep.h>
     32 #include <sys/kobj.h>
     33 #include <sys/varargs.h>
     34 #include <sys/reboot.h>
     35 
     36 extern void (*_kobj_printf)(void *, const char *fmt, ...);
     37 extern int get_weakish_int(int *);
     38 extern struct bootops *ops;
     39 extern struct boot_fs_ops bufs_ops, bhsfs_ops;
     40 extern int kmem_ready;
     41 
     42 static uint64_t rd_start, rd_end;
     43 struct boot_fs_ops *bfs_ops;
     44 struct boot_fs_ops *bfs_tab[] = {&bufs_ops, &bhsfs_ops, NULL};
     45 
     46 static uintptr_t scratch_max = 0;
     47 
     48 #define	_kmem_ready	get_weakish_int(&kmem_ready)
     49 
     50 /*
     51  * This one reads the ramdisk. If fi_memp is set, we copy the
     52  * ramdisk content to the designated buffer. Otherwise, we
     53  * do a "cached" read (set fi_memp to the actual ramdisk buffer).
     54  */
     55 int
     56 diskread(fileid_t *filep)
     57 {
     58 	uint_t blocknum;
     59 	caddr_t diskloc;
     60 
     61 	/* add in offset of root slice */
     62 	blocknum = filep->fi_blocknum;
     63 
     64 	diskloc = (caddr_t)(uintptr_t)rd_start + blocknum * DEV_BSIZE;
     65 	if (diskloc + filep->fi_count > (caddr_t)(uintptr_t)rd_end) {
     66 		_kobj_printf(ops, "diskread: start = 0x%p, size = 0x%x\n",
     67 		    diskloc, filep->fi_count);
     68 		_kobj_printf(ops, "reading beyond end of ramdisk\n");
     69 		return (-1);
     70 	}
     71 
     72 	if (filep->fi_memp) {
     73 		bcopy(diskloc, filep->fi_memp, filep->fi_count);
     74 	} else {
     75 		/* "cached" read */
     76 		filep->fi_memp = diskloc;
     77 	}
     78 
     79 	return (0);
     80 }
     81 
     82 int
     83 kobj_boot_mountroot()
     84 {
     85 	int i;
     86 
     87 	if (BOP_GETPROPLEN(ops, "ramdisk_start") != 8 ||
     88 	    BOP_GETPROP(ops, "ramdisk_start", (void *)&rd_start) != 0 ||
     89 	    BOP_GETPROPLEN(ops, "ramdisk_end") != 8 ||
     90 	    BOP_GETPROP(ops, "ramdisk_end", (void *)&rd_end) != 0) {
     91 		_kobj_printf(ops,
     92 		    "failed to get ramdisk from boot\n");
     93 		return (-1);
     94 	}
     95 #ifdef KOBJ_DEBUG
     96 	_kobj_printf(ops,
     97 	    "ramdisk range: 0x%llx-%llx\n", rd_start, rd_end);
     98 #endif
     99 
    100 	for (i = 0; bfs_tab[i] != NULL; i++) {
    101 		bfs_ops = bfs_tab[i];
    102 		if (BRD_MOUNTROOT(bfs_ops, "dummy") == 0)
    103 			return (0);
    104 	}
    105 	_kobj_printf(ops, "failed to mount ramdisk from boot\n");
    106 	return (-1);
    107 }
    108 
    109 void
    110 kobj_boot_unmountroot()
    111 {
    112 #ifdef	DEBUG
    113 	if (boothowto & RB_VERBOSE)
    114 		_kobj_printf(ops, "boot scratch memory used: 0x%lx\n",
    115 		    scratch_max);
    116 #endif
    117 	(void) BRD_UNMOUNTROOT(bfs_ops);
    118 }
    119 
    120 /*
    121  * Boot time wrappers for memory allocators. Called for both permanent
    122  * and temporary boot memory allocations. We have to track which allocator
    123  * (boot or kmem) was used so that we know how to free.
    124  */
    125 void *
    126 bkmem_alloc(size_t size)
    127 {
    128 	/* allocate from boot scratch memory */
    129 	void *addr;
    130 
    131 	if (_kmem_ready)
    132 		return (kobj_alloc(size, 0));
    133 
    134 	/*
    135 	 * Remember the highest BOP_ALLOC allocated address and don't free
    136 	 * anything below it.
    137 	 */
    138 	addr = BOP_ALLOC(ops, 0, size, 0);
    139 	if (scratch_max < (uintptr_t)addr + size)
    140 		scratch_max = (uintptr_t)addr + size;
    141 	return (addr);
    142 }
    143 
    144 /*ARGSUSED*/
    145 void
    146 bkmem_free(void *p, size_t size)
    147 {
    148 	/*
    149 	 * Free only if it's not boot scratch memory.
    150 	 */
    151 	if ((uintptr_t)p >= scratch_max)
    152 		kobj_free(p, size);
    153 }
    154 
    155 /*PRINTFLIKE1*/
    156 void
    157 kobj_printf(char *fmt, ...)
    158 {
    159 	va_list adx;
    160 
    161 	va_start(adx, fmt);
    162 	_kobj_printf(ops, fmt, adx);
    163 	va_end(adx);
    164 }
    165