9. Register blocks

The NIC register space is constructed from a linked list of register blocks. Each block starts with a header that contains type, version, and next header fields. Blocks must be DWORD aligned in the register space. All fields must be naturally aligned. All pointers in the register blocks are relative to the start of the region. The list is terminated with a next pointer of 0x00000000. See Table 9.1 for a list of all currently-defined register blocks.

Address	Field	31..24	23..16	15..8	7..0	Reset value
RBB+0x00	Type	Vendor ID		Type		RO -
RBB+0x04	Version	Major	Minor	Patch	Meta	RO -
RBB+0x08	Next pointer	Pointer to next register block				RO -

Type

The type field consists of a vendor ID in the upper 16 bits, and the sub type in the lower 16 bits. Vendor ID 0x0000 is used for all standard register blocks used by Corundum. See Table 9.1 for a list of all currently-defined register blocks.

Address	31..24	23..16	15..8	7..0	Reset value
RBB+0x00	Vendor ID		Type		RO -

Version

The version field consists of four fields, major, minor, patch, and meta. Version numbers must be changed when backwards-incompatible changes are made to register blocks. See Table 9.1 for a list of all currently-defined register blocks.

Address	31..24	23..16	15..8	7..0	Reset value
RBB+0x04	Major	Minor	Patch	Meta	RO -

Next pointer

The next pointer field contains a block-relative offset to the start of the header of the next register block in the chain. A next pointer of 0x00000000 indicates the end of the chain.

Address	31..24	23..16	15..8	7..0	Reset value
RBB+0x08	Pointer to next register block				RO -

Table 9.1 List of all currently-defined register blocks

Type	Version	Block
0x00000000	-	Null register block
0xFFFFFFFF	0x00000100	Firmware ID register block
0x0000C000	0x00000100	Interface register block
0x0000C001	0x00000400	Interface control register block
0x0000C002	0x00000200	Port register block
0x0000C003	0x00000200	Port control register block
0x0000C004	0x00000300	Scheduler block register block
0x0000C005	0x00000200	App info register block
0x0000C006	0x00000100	stats
0x0000C007	0x00000100	IRQ config
0x0000C008	0x00000100	Clock info register block
0x0000C010	0x00000400	Event queue manager register block
0x0000C020	0x00000400	Completion queue manager register block
0x0000C030	0x00000400	Transmit queue manager register block
0x0000C031	0x00000400	Receive queue manager register block
0x0000C040	0x00000100	Round-robin scheduler register block
0x0000C050	0x00000100	TDMA scheduler controller register block
0x0000C060	0x00000100	TDMA scheduler register block
0x0000C080	0x00000100	PTP hardware clock register block
0x0000C081	0x00000100	PTP period output register block
0x0000C090	0x00000200	RX queue map register block
0x0000C100	0x00000100	GPIO register block
0x0000C110	0x00000100	I2C register block
0x0000C120	0x00000200	SPI flash register block
0x0000C121	0x00000200	BPI flash register block
0x0000C140	0x00000100	Alveo BMC register block
0x0000C141	0x00000100	Gecko BMC register block
0x0000C150	0x00000100	DRP register block