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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
* Copyright (c) 2018, Joyent, Inc.
*/
/*
* Platform-Specific SMBIOS Subroutines
*
* The routines in this file form part of <sys/smbios_impl.h> and combine with
* the usr/src/common/smbios code to form an in-kernel SMBIOS decoding service.
* The SMBIOS entry point is locating by scanning a range of physical memory
* assigned to BIOS as described in Section 2 of the DMTF SMBIOS specification.
*/
#include <sys/smbios_impl.h>
#include <sys/sysmacros.h>
#include <sys/errno.h>
#include <sys/psm.h>
#include <sys/smp_impldefs.h>
smbios_hdl_t *ksmbios;
int ksmbios_flags;
smbios_hdl_t *
smb_open_error(smbios_hdl_t *shp, int *errp, int err)
{
if (shp != NULL)
smbios_close(shp);
if (errp != NULL)
*errp = err;
if (ksmbios == NULL)
cmn_err(CE_CONT, "?SMBIOS not loaded (%s)", smbios_errmsg(err));
return (NULL);
}
smbios_hdl_t *
smbios_open(const char *file, int version, int flags, int *errp)
{
smbios_hdl_t *shp = NULL;
smbios_entry_t *ep;
caddr_t stbuf, bios, p, q;
caddr_t smb2, smb3;
uint64_t startaddr, startoff = 0;
size_t bioslen;
uint_t smbe_stlen;
smbios_entry_point_t ep_type;
uint8_t smbe_major, smbe_minor;
int err;
if (file != NULL || (flags & ~SMB_O_MASK))
return (smb_open_error(shp, errp, ESMB_INVAL));
if ((startaddr = ddi_prop_get_int64(DDI_DEV_T_ANY, ddi_root_node(),
DDI_PROP_DONTPASS, "smbios-address", 0)) == 0) {
startaddr = SMB_RANGE_START;
bioslen = SMB_RANGE_LIMIT - SMB_RANGE_START + 1;
} else {
/* We have smbios address from boot loader, map one page. */
bioslen = MMU_PAGESIZE;
startoff = startaddr & MMU_PAGEOFFSET;
startaddr &= MMU_PAGEMASK;
}
bios = psm_map_phys(startaddr, bioslen, PSM_PROT_READ);
if (bios == NULL)
return (smb_open_error(shp, errp, ESMB_MAPDEV));
/*
* In case we did map one page, make sure we will not cross
* the end of the page.
*/
p = bios + startoff;
q = bios + bioslen - startoff;
smb2 = smb3 = NULL;
while (p < q) {
if (smb2 != NULL && smb3 != NULL)
break;
if (smb3 == NULL && strncmp(p, SMB3_ENTRY_EANCHOR,
SMB3_ENTRY_EANCHORLEN) == 0) {
smb3 = p;
} else if (smb2 == NULL && strncmp(p, SMB_ENTRY_EANCHOR,
SMB_ENTRY_EANCHORLEN) == 0) {
smb2 = p;
}
p += SMB_SCAN_STEP;
}
if (smb2 == NULL && smb3 == NULL) {
psm_unmap_phys(bios, bioslen);
return (smb_open_error(shp, errp, ESMB_NOTFOUND));
}
/*
* While they're not supposed to (as per the SMBIOS 3.2 spec), some
* vendors end up having a newer version in one of the two entry points
* than the other. If we found multiple tables then we will prefer the
* one with the newer version. If they're equivalent, we prefer the
* 32-bit version. If only one is present, then we use that.
*/
ep = smb_alloc(SMB_ENTRY_MAXLEN);
if (smb2 != NULL && smb3 != NULL) {
uint8_t smb2maj, smb2min, smb3maj, smb3min;
bcopy(smb2, ep, sizeof (smbios_entry_t));
smb2maj = ep->ep21.smbe_major;
smb2min = ep->ep21.smbe_minor;
bcopy(smb3, ep, sizeof (smbios_entry_t));
smb3maj = ep->ep30.smbe_major;
smb3min = ep->ep30.smbe_minor;
if (smb3maj > smb2maj ||
(smb3maj == smb2maj && smb3min > smb2min)) {
ep_type = SMBIOS_ENTRY_POINT_30;
p = smb3;
} else {
ep_type = SMBIOS_ENTRY_POINT_21;
p = smb2;
}
} else if (smb3 != NULL) {
ep_type = SMBIOS_ENTRY_POINT_30;
p = smb3;
} else {
ep_type = SMBIOS_ENTRY_POINT_21;
p = smb2;
}
bcopy(p, ep, sizeof (smbios_entry_t));
if (ep_type == SMBIOS_ENTRY_POINT_21) {
ep->ep21.smbe_elen = MIN(ep->ep21.smbe_elen, SMB_ENTRY_MAXLEN);
bcopy(p, ep, ep->ep21.smbe_elen);
} else if (ep_type == SMBIOS_ENTRY_POINT_30) {
ep->ep30.smbe_elen = MIN(ep->ep30.smbe_elen, SMB_ENTRY_MAXLEN);
bcopy(p, ep, ep->ep30.smbe_elen);
}
psm_unmap_phys(bios, bioslen);
switch (ep_type) {
case SMBIOS_ENTRY_POINT_21:
smbe_major = ep->ep21.smbe_major;
smbe_minor = ep->ep21.smbe_minor;
smbe_stlen = ep->ep21.smbe_stlen;
bios = psm_map_phys(ep->ep21.smbe_staddr, smbe_stlen,
PSM_PROT_READ);
break;
case SMBIOS_ENTRY_POINT_30:
smbe_major = ep->ep30.smbe_major;
smbe_minor = ep->ep30.smbe_minor;
smbe_stlen = ep->ep30.smbe_stlen;
bios = psm_map_phys_new(ep->ep30.smbe_staddr, smbe_stlen,
PSM_PROT_READ);
break;
default:
smb_free(ep, SMB_ENTRY_MAXLEN);
return (smb_open_error(shp, errp, ESMB_VERSION));
}
if (bios == NULL) {
smb_free(ep, SMB_ENTRY_MAXLEN);
return (smb_open_error(shp, errp, ESMB_MAPDEV));
}
stbuf = smb_alloc(smbe_stlen);
bcopy(bios, stbuf, smbe_stlen);
psm_unmap_phys(bios, smbe_stlen);
shp = smbios_bufopen(ep, stbuf, smbe_stlen, version, flags, &err);
if (shp == NULL) {
smb_free(stbuf, smbe_stlen);
smb_free(ep, SMB_ENTRY_MAXLEN);
return (smb_open_error(shp, errp, err));
}
if (ksmbios == NULL) {
cmn_err(CE_CONT, "?SMBIOS v%u.%u loaded (%u bytes)",
smbe_major, smbe_minor, smbe_stlen);
if (shp->sh_flags & SMB_FL_TRUNC)
cmn_err(CE_CONT, "?SMBIOS table is truncated");
}
shp->sh_flags |= SMB_FL_BUFALLOC;
smb_free(ep, SMB_ENTRY_MAXLEN);
return (shp);
}
/*ARGSUSED*/
smbios_hdl_t *
smbios_fdopen(int fd, int version, int flags, int *errp)
{
return (smb_open_error(NULL, errp, ENOTSUP));
}
/*ARGSUSED*/
int
smbios_write(smbios_hdl_t *shp, int fd)
{
return (smb_set_errno(shp, ENOTSUP));
}
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