bootrd.c revision 7656:2621e50fdf4a 
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
36extern void (*_kobj_printf)(void *, const char *fmt, ...);
37extern int get_weakish_int(int *);
38extern struct bootops *ops;
39extern struct boot_fs_ops bufs_ops, bhsfs_ops;
40extern int kmem_ready;
41
42static uint64_t rd_start, rd_end;
43struct boot_fs_ops *bfs_ops;
44struct boot_fs_ops *bfs_tab[] = {&bufs_ops, &bhsfs_ops, NULL};
45
46static 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 */
55int
56diskread(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
82int
83kobj_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
109void
110kobj_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 */
125void *
126bkmem_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*/
145void
146bkmem_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*/
156void
157kobj_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