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libsa: Update comments about SMBIOS specification

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Summary:
Include details from the SMBIOS 3 specification and some additional
details for SMBIOS 2.1.

Obtained from:	Juniper Networks, Inc.

Reviewers: jmg, manu

Subscribers: imp, dab

Differential Revision: https://reviews.freebsd.org/D39635
This commit is contained in:
Stephen J. Kiernan 2023-04-17 21:36:37 -04:00
parent 0c01203e47
commit b5c3ade765
1 changed files with 41 additions and 6 deletions
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47
stand/libsa/smbios.c
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@ -43,16 +43,51 @@ __FBSDID("$FreeBSD$");
*
* System Management BIOS Reference Specification, v2.6 Final
* http://www.dmtf.org/standards/published_documents/DSP0134_2.6.0.pdf
*
* System Management BIOS (SMBIOS) Reference Specification, 3.6.0
* https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.6.0.pdf
*/
/*
* 2.1.1 SMBIOS Structure Table Entry Point
* The first quoted paragraph below can also be found in section 2.1.1 SMBIOS
* Structure Table Entry Point of System Management BIOS Reference
* Specification, v2.6 Final
*
* "On non-EFI systems, the SMBIOS Entry Point structure, described below, can
* be located by application software by searching for the anchor-string on
* paragraph (16-byte) boundaries within the physical memory address range
* 000F0000h to 000FFFFFh. This entry point encapsulates an intermediate anchor
* string that is used by some existing DMI browsers."
* (From System Management BIOS (SMBIOS) Reference Specification, 3.6.0)
* 5.2.1 SMBIOS 2.1 (32-bit) Entry Point
*
* "On non-UEFI systems, the 32-bit SMBIOS Entry Point structure, can be
* located by application software by searching for the anchor-string on
* paragraph (16-byte) boundaries within the physical memory address
* range 000F0000h to 000FFFFFh. This entry point encapsulates an intermediate
* anchor string that is used by some existing DMI browsers.
*
* On UEFI-based systems, the SMBIOS Entry Point structure can be located by
* looking in the EFI Configuration Table for the SMBIOS GUID
* (SMBIOS_TABLE_GUID, {EB9D2D31-2D88-11D3-9A16-0090273FC14D}) and using the
* associated pointer. See section 4.6 of the UEFI Specification for details.
* See section 2.3 of the UEFI Specification for how to report the containing
* memory type.
*
* NOTE While the SMBIOS Major and Minor Versions (offsets 06h and 07h)
* currently duplicate the information that is present in the SMBIOS BCD
* Revision (offset 1Eh), they provide a path for future growth in this
* specification. The BCD Revision, for example, provides only a single digit
* for each of the major and minor version numbers."
*
* 5.2.2 SMBIOS 860 3.0 (64-bit) Entry Point
*
* "On non-UEFI systems, the 64-bit SMBIOS Entry Point structure can be located
* by application software by searching for the anchor-string on paragraph
* (16-byte) boundaries within the physical memory address range 000F0000h to
* 000FFFFFh.
*
* On UEFI-based systems, the SMBIOS Entry Point structure can be located by
* looking in the EFI Configuration Table for the SMBIOS 3.x GUID
* (SMBIOS3_TABLE_GUID, {F2FD1544-9794-4A2C-992E-E5BBCF20E394}) and using the
* associated pointer. See section 4.6 of the UEFI Specification for details.
* See section 2.3 of the UEFI Specification for how to report the containing
* memory type."
*/
#define SMBIOS_START 0xf0000
#define SMBIOS_LENGTH 0x10000