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