/*
 * 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.
 * Copyright 2026 Edgecast Cloud LLC.
 */

/*
 * 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 a page or two.
                 */
                bioslen = MMU_PAGESIZE;
                startoff = startaddr & MMU_PAGEOFFSET;
                startaddr &= MMU_PAGEMASK;
                if (bioslen - startoff <= startoff)
                        bioslen += MMU_PAGESIZE;
        }

        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));
}