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06326613af
D28743 was commited, reverted and then f689cb23b2 landed before it
was recommitted. However, D28743 included an extra length check. Redo
that functionality so we check both the number of entries as well as the
length checks for wacky data.
Sponsored by: Netflix
Reviewed by: gallatin
Differential Revision: https://reviews.freebsd.org/D45763
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 1997 Michael Smith
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* Copyright (c) 1998 Jonathan Lemon
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _SMBIOS_H_
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#define _SMBIOS_H_
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/*
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* System Management BIOS
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*/
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#define SMBIOS_START 0xf0000
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#define SMBIOS_STEP 0x10
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#define SMBIOS_OFF 0
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#define SMBIOS_LEN 4
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#define SMBIOS_SIG "_SM_"
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#define SMBIOS3_LEN 5
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#define SMBIOS3_SIG "_SM3_"
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struct smbios_eps {
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uint8_t anchor_string[4]; /* '_SM_' */
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uint8_t checksum;
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uint8_t length;
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uint8_t major_version;
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uint8_t minor_version;
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uint16_t maximum_structure_size;
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uint8_t entry_point_revision;
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uint8_t formatted_area[5];
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uint8_t intermediate_anchor_string[5]; /* '_DMI_' */
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uint8_t intermediate_checksum;
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uint16_t structure_table_length;
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uint32_t structure_table_address;
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uint16_t number_structures;
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uint8_t BCD_revision;
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} __packed;
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struct smbios3_eps {
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uint8_t anchor_string[5]; /* '_SM3_' */
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uint8_t checksum;
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uint8_t length;
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uint8_t major_version;
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uint8_t minor_version;
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uint8_t docrev;
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uint8_t entry_point_revision;
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uint8_t reserved;
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uint32_t structure_table_max_size;
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uint64_t structure_table_address;
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};
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struct smbios_structure_header {
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uint8_t type;
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uint8_t length;
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uint16_t handle;
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} __packed;
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typedef void (*smbios_callback_t)(struct smbios_structure_header *, void *);
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static inline void
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smbios_walk_table(uint8_t *p, int entries, vm_size_t len,
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smbios_callback_t cb, void *arg)
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{
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struct smbios_structure_header *s;
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uint8_t *endp = p + len;
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while (entries-- && p < endp) {
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s = (struct smbios_structure_header *)p;
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cb(s, arg);
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/*
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* Look for a double-nul after the end of the
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* formatted area of this structure.
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*/
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p += s->length;
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while (p + 1 < endp && !(p[0] == 0 && p[1] == 0))
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p++;
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/*
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* Skip over the double-nul to the start of the next
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* structure.
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*/
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p += 2;
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}
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}
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#ifdef _KERNEL
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void identify_hypervisor_smbios(void);
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#endif
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#endif /* _SMBIOS_H_ */
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