xref: /titanic_41/usr/src/cmd/boot/installgrub/pcfs_glue.c (revision 6a634c9dca3093f3922e4b7ab826d7bdf17bf78e)
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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23  */
24 
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <unistd.h>
28 #include <sys/param.h>
29 #include <sys/bootvfs.h>
30 #include <sys/filep.h>
31 
32 #include <libintl.h>
33 #include <locale.h>
34 #include "message.h"
35 
36 /*
37  * This file is glue layer to pcfs module in usr/src/common/fs/pcfs.c.
38  * It's main functionality is to get the stage file blocklist. It's
39  * used for installing grub on a Solaris boot partition.
40  */
41 extern struct boot_fs_ops bpcfs_ops;
42 struct boot_fs_ops *bfs_ops;
43 struct boot_fs_ops *bfs_tab[] = {&bpcfs_ops, NULL};
44 static int dev_fd;
45 int bootrd_debug = 0;
46 
47 #define	DEV_BSIZE	512
48 #define	MAX_CHUNK	64
49 
50 static unsigned int *blocklist;
51 
52 /* diskread_callback is set in filesytem module (pcfs.c) */
53 int (*diskread_callback)(int, int);
54 int (*fileread_callback)(int, int);
55 
56 static int
add_stage2_block(int blocknum,int nblk)57 add_stage2_block(int blocknum, int nblk)
58 {
59 	static int i = -2;
60 
61 	if (i >= 0 && (blocklist[i] + blocklist[i + 1] == blocknum)) {
62 		blocklist[i + 1] += nblk;
63 		return (0);
64 	}
65 
66 	i += 2;
67 	if (i >= DEV_BSIZE / 8) {
68 		fprintf(stderr, PCFS_FRAGMENTED);
69 		exit(-1);
70 	}
71 	blocklist[i] = blocknum;
72 	blocklist[i + 1] = nblk;
73 	return (0);
74 }
75 
76 /*
77  * This one reads the ramdisk. If fi_memp is set, we copy the
78  * ramdisk content to the designated buffer. Otherwise, we
79  * do a "cached" read (set fi_memp to the actual ramdisk buffer).
80  */
81 int
diskread(fileid_t * filep)82 diskread(fileid_t *filep)
83 {
84 	int ret;
85 	uint_t blocknum, diskloc;
86 
87 	blocknum = filep->fi_blocknum;
88 
89 	if (diskread_callback) {
90 		diskread_callback(blocknum, filep->fi_count / DEV_BSIZE);
91 		return (0);
92 	}
93 
94 	diskloc = blocknum * DEV_BSIZE;
95 	if (filep->fi_memp == NULL) {
96 		filep->fi_memp = malloc(filep->fi_count);
97 	}
98 	if (filep->fi_memp == NULL) {
99 		fprintf(stderr, OUT_OF_MEMORY);
100 		return (-1);
101 	}
102 
103 	ret = pread(dev_fd, filep->fi_memp, filep->fi_count, diskloc);
104 	if (ret < 0)
105 		perror("diskread: pread");
106 	return (ret >= 0 ? 0 : -1);
107 }
108 
109 void *
bkmem_alloc(size_t s)110 bkmem_alloc(size_t s)
111 {
112 	return (malloc(s));
113 }
114 
115 /*ARGSUSED*/
116 void
bkmem_free(void * p,size_t s)117 bkmem_free(void *p, size_t s)
118 {
119 	free(p);
120 }
121 
122 static int
mountroot(char * name)123 mountroot(char *name)
124 {
125 	int i;
126 
127 	/* try ops in bfs_tab and return the first successful one */
128 	for (i = 0; bfs_tab[i] != NULL; i++) {
129 		bfs_ops = bfs_tab[i];
130 		if (BRD_MOUNTROOT(bfs_ops, name) == 0)
131 			return (0);
132 	}
133 	return (-1);
134 }
135 
136 static int
unmountroot()137 unmountroot()
138 {
139 	return (BRD_UNMOUNTROOT(bfs_ops));
140 }
141 
142 static int
pcfs_glue_open(const char * filename,int flags)143 pcfs_glue_open(const char *filename, int flags)
144 {
145 	return (BRD_OPEN(bfs_ops, (char *)filename, flags));
146 }
147 
148 static int
pcfs_glue_close(int fd)149 pcfs_glue_close(int fd)
150 {
151 	return (BRD_CLOSE(bfs_ops, fd));
152 }
153 
154 static ssize_t
pcfs_glue_read(int fd,void * buf,size_t size)155 pcfs_glue_read(int fd, void *buf, size_t size)
156 {
157 	return (BRD_READ(bfs_ops, fd, buf, size));
158 }
159 
160 static off_t
pcfs_glue_lseek(int fd,off_t addr,int whence)161 pcfs_glue_lseek(int fd, off_t addr, int whence)
162 {
163 	return (BRD_SEEK(bfs_ops, fd, addr, whence));
164 }
165 
166 /*
167  * Get the blocklist for stage2
168  */
169 int
read_stage2_blocklist(int device_fd,unsigned int * blkbuf)170 read_stage2_blocklist(int device_fd, unsigned int *blkbuf)
171 {
172 	int i, fd, stage2_block;
173 	char buf[DEV_BSIZE];
174 	ssize_t size;
175 
176 	dev_fd = device_fd;
177 	if (mountroot("dummy") != 0) {
178 		fprintf(stderr, MOUNT_FAIL_PCFS);
179 		return (-1);
180 	}
181 
182 	if ((fd = pcfs_glue_open("/boot/grub/stage2", 0)) == -1) {
183 		fprintf(stderr, OPEN_FAIL_PCFS);
184 		return (-1);
185 	}
186 
187 	if (bootrd_debug)
188 		(void) printf("start reading stage2:\n");
189 	stage2_block = 0;
190 	blocklist = blkbuf;
191 	fileread_callback = add_stage2_block;
192 	for (;;) {
193 		size = pcfs_glue_read(fd, buf, DEV_BSIZE);
194 		if (size != DEV_BSIZE)
195 			break;
196 		stage2_block++;
197 	}
198 	fileread_callback = NULL;
199 	(void) pcfs_glue_close(fd);
200 
201 	if (bootrd_debug) {
202 		(void) printf("last block size = %d\n", size);
203 		for (i = 0; blocklist[i] != 0; i += 2) {
204 			(void) printf("sectors: %d-%d\n",
205 			    blocklist[i],
206 			    blocklist[i] + blocklist[i + 1] - 1);
207 		}
208 		(void) printf("total blocks in stage 2: %d\n", stage2_block);
209 	}
210 
211 	(void) unmountroot();
212 	return (0);
213 }
214