usr/src/uts/i86pc/os/smb_dev.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22
  23 /*
  24  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  25  * Use is subject to license terms.
  26  */
  27
  28 #pragma ident   "%Z%%M% %I%     %E% SMI"
  29
  30 /*
  31  * Platform-Specific SMBIOS Subroutines
  32  *
  33  * The routines in this file form part of <sys/smbios_impl.h> and combine with
  34  * the usr/src/common/smbios code to form an in-kernel SMBIOS decoding service.
  35  * The SMBIOS entry point is locating by scanning a range of physical memory
  36  * assigned to BIOS as described in Section 2 of the DMTF SMBIOS specification.
  37  */
  38
  39 #include <sys/smbios_impl.h>
  40 #include <sys/sysmacros.h>
  41 #include <sys/errno.h>
  42 #include <sys/psm.h>
  43 #include <sys/smp_impldefs.h>
  44
  45 smbios_hdl_t *ksmbios;
  46 int ksmbios_flags;
  47
  48 smbios_hdl_t *
  49 smb_open_error(smbios_hdl_t *shp, int *errp, int err)
  50 {
  51         if (shp != NULL)
  52                 smbios_close(shp);
  53
  54         if (errp != NULL)
  55                 *errp = err;
  56
  57         if (ksmbios == NULL)
  58                 cmn_err(CE_CONT, "?SMBIOS not loaded (%s)", smbios_errmsg(err));
  59
  60         return (NULL);
  61 }
  62
  63 smbios_hdl_t *
  64 smbios_open(const char *file, int version, int flags, int *errp)
  65 {
  66         smbios_hdl_t *shp = NULL;
  67         smbios_entry_t *ep;
  68         caddr_t stbuf, bios, p, q;
  69         size_t bioslen;
  70         int err;
  71
  72         if (file != NULL || (flags & ~SMB_O_MASK))
  73                 return (smb_open_error(shp, errp, ESMB_INVAL));
  74
  75         bioslen = SMB_RANGE_LIMIT - SMB_RANGE_START + 1;
  76         bios = psm_map_phys(SMB_RANGE_START, bioslen, PSM_PROT_READ);
  77
  78         if (bios == NULL)
  79                 return (smb_open_error(shp, errp, ESMB_MAPDEV));
  80
  81         for (p = bios, q = bios + bioslen; p < q; p += 16) {
  82                 if (strncmp(p, SMB_ENTRY_EANCHOR, SMB_ENTRY_EANCHORLEN) == 0)
  83                         break;
  84         }
  85
  86         if (p >= q) {
  87                 psm_unmap_phys(bios, bioslen);
  88                 return (smb_open_error(shp, errp, ESMB_NOTFOUND));
  89         }
  90
  91         ep = smb_alloc(SMB_ENTRY_MAXLEN);
  92         bcopy(p, ep, sizeof (smbios_entry_t));
  93         ep->smbe_elen = MIN(ep->smbe_elen, SMB_ENTRY_MAXLEN);
  94         bcopy(p, ep, ep->smbe_elen);
  95
  96         psm_unmap_phys(bios, bioslen);
  97         bios = psm_map_phys(ep->smbe_staddr, ep->smbe_stlen, PSM_PROT_READ);
  98
  99         if (bios == NULL) {
 100                 smb_free(ep, SMB_ENTRY_MAXLEN);
 101                 return (smb_open_error(shp, errp, ESMB_MAPDEV));
 102         }
 103
 104         stbuf = smb_alloc(ep->smbe_stlen);
 105         bcopy(bios, stbuf, ep->smbe_stlen);
 106         psm_unmap_phys(bios, ep->smbe_stlen);
 107         shp = smbios_bufopen(ep, stbuf, ep->smbe_stlen, version, flags, &err);
 108
 109         if (shp == NULL) {
 110                 smb_free(stbuf, ep->smbe_stlen);
 111                 smb_free(ep, SMB_ENTRY_MAXLEN);
 112                 return (smb_open_error(shp, errp, err));
 113         }
 114
 115         if (ksmbios == NULL) {
 116                 cmn_err(CE_CONT, "?SMBIOS v%u.%u loaded (%u bytes)",
 117                     ep->smbe_major, ep->smbe_minor, ep->smbe_stlen);
 118         }
 119
 120         shp->sh_flags |= SMB_FL_BUFALLOC;
 121         smb_free(ep, SMB_ENTRY_MAXLEN);
 122
 123         return (shp);
 124 }
 125
 126 /*ARGSUSED*/
 127 smbios_hdl_t *
 128 smbios_fdopen(int fd, int version, int flags, int *errp)
 129 {
 130         return (smb_open_error(NULL, errp, ENOTSUP));
 131 }
 132
 133 /*ARGSUSED*/
 134 int
 135 smbios_write(smbios_hdl_t *shp, int fd)
 136 {
 137         return (smb_set_errno(shp, ENOTSUP));
 138 }