usr/src/stand/lib/fs/common/promfs.c

   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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  26
  27 #include <sys/param.h>
  28 #include <sys/sysmacros.h>
  29 #include <sys/stat.h>
  30 #include <sys/bootvfs.h>
  31 #include <sys/bootsyms.h>
  32 #include <sys/promif.h>
  33 #include <sys/salib.h>
  34
  35 /*
  36  *  Function prototypes
  37  */
  38 static int      promfs_mountroot(char *str);
  39 static int      promfs_unmountroot(void);
  40 static int      promfs_open(char *filename, int flags);
  41 static int      promfs_close(int fd);
  42 static ssize_t  promfs_read(int fd, caddr_t buf, size_t size);
  43 static off_t    promfs_lseek(int fd, off_t offset, int whence);
  44 static int      promfs_fstat(int fd, struct bootstat *stp);
  45 static void     promfs_closeall(int flag);
  46
  47 struct boot_fs_ops promfs_ops = {
  48         "promfs",
  49         promfs_mountroot,
  50         promfs_unmountroot,
  51         promfs_open,
  52         promfs_close,
  53         promfs_read,
  54         promfs_lseek,
  55         promfs_fstat,
  56         promfs_closeall,
  57         NULL
  58 };
  59
  60 static ihandle_t fsih;
  61
  62 static int
  63 promfs_mountroot(char *str)
  64 {
  65
  66         (void) prom_getprop(prom_chosennode(), str, (caddr_t)&fsih);
  67         return (fsih == -1);
  68 }
  69
  70 static int
  71 promfs_unmountroot(void)
  72 {
  73         (void) prom_close(fsih);
  74         return (0);
  75 }
  76
  77 /*ARGSUSED*/
  78 static int
  79 promfs_open(char *filename, int flags)
  80 {
  81         return (prom_fopen(fsih, filename));
  82 }
  83
  84 static int
  85 promfs_close(int fd)
  86 {
  87         prom_fclose(fsih, fd);
  88         return (0);
  89 }
  90
  91 static ssize_t
  92 promfs_read(int fd, caddr_t buf, size_t size)
  93 {
  94         return (prom_fread(fsih, fd, buf, size));
  95 }
  96
  97 /*ARGSUSED*/
  98 static off_t
  99 promfs_lseek(int fd, off_t offset, int whence)
 100 {
 101         return (prom_fseek(fsih, fd, offset));
 102 }
 103
 104 static int
 105 promfs_fstat(int fd, struct bootstat *stp)
 106 {
 107         return (prom_fsize(fsih, fd, (size_t *)&stp->st_size));
 108 }
 109
 110 /*ARGSUSED*/
 111 static void
 112 promfs_closeall(int flag)
 113 {
 114 }