Sun PCI-Express Root Complex Information (Type 138)

Source: illumos, usr/src/uts/common/sys/smbios_impl.h.

Describes the PCI address of a PCI-Express root complex or root port and the baseboard containing it.

Table 1. Sun PCI-Express Root Complex Information structure
Offset	Version	Name	Length	Value	Description
`0x00`	2.0+	Type	`BYTE`	`138`	Sun PCI-Express Root Complex Information indicator
`0x01`	2.0+	Length	`BYTE`	`0x08`	Length of the structure
`0x02`	2.0+	Handle	`WORD`	Varies
`0x04`	2.0+	Baseboard Handle	`WORD`	`HANDLE`	Baseboard containing the root complex or root port
`0x06`	2.0+	Bus/Device/Function	`WORD`	`NUMBER`	PCI address of the root complex or root port

Bus, device and function numbers are packed as in PCI routing IDs: bus number in bits 15:8, device number in bits 7:3, function number in bits 2:0. The structure definition leaves the packing out, and it is known from how illumos uses the field: the x86pi topology module matches it against the bits 23:8 of the reg property of PCI devices, see x86pi_bdf in usr/src/lib/fm/topo/modules/i86pc/x86pi/x86pi_subr.c.