Datasheet
Intel® Management Engine Subsystem Registers (D22:F[3:0])
576 Intel® Xeon® Processor D-1500 Product Family
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
17.2.1.26 HERX—Intel
®
MEI Extend Register DWX (Intel
®
MEI 2—D22:F1)
Address Offset: HER1: C0h–C3h Attribute: RO
HER2: C4h–C7h
HER3: C8h–CBh
HER4: CCh–CFh
HER5: D0h–D3h
HER6: D4h–D7h
HER7: D8h–DBh
HER8: DCh–DFh
Default Value: 00000000h Size: 32 bits
17.2.2 MEI1_MBAR—Intel
®
MEI 2 MMIO Registers
These MMIO registers are accessible starting at the Intel MEI 2 MMIO Base Address
(MEI1_MBAR) which gets programmed into D22:F1:Offset 10–17h. These registers are
reset by PLTRST# unless otherwise noted.
17.2.2.1 H_CB_WW—Host Circular Buffer Write Window
(Intel
®
MEI 2 MMIO Register)
Address Offset: MEI1_MBAR + 00h Attribute: W
Default Value: 00000000h Size: 32 bits
3:0 Extend Register Algorithm (ERA)- RO. This field indicates the hash algorithm used in the FW
measurement extend operations. Encodings are:
0h = SHA-1
2h = SHA-256
Other values = Reserved
Bit Description
Bit Description
31:0 Extend Register DWX (ERDWX):
Xth DWORD result of the extend operation.
Note: Extend Operation is HER[5:1] if using SHA-1. If using SHA-256, then Extend Operation is
HER[8:1].
Table 17-4. Intel
®
MEI 2 MMIO Register Address Map
MEI1_MBAR+
Offset
Mnemonic Register Name Default Attribute
00–03h H_CB_WW Host Circular Buffer Write Window 00000000h W
04h–07h H_CSR Host Control Status 02000000h R/W,
R/WC, RO
08h–0Bh ME_CB_RW Intel ME Circular Buffer Read Window FFFFFFFFh RO
0Ch–0Fh ME_CSR_HA Intel ME Control Status Host Access 02000000h RO
Bit Description
31:0 Host Circular Buffer Write Window Field (H_CB_WWF)- W. This bit field is for host to write
into its circular buffer. The host's circular buffer is located at the Intel ME subsystem address
specified in the Host CB Base Address register. This field is write only, reads will return arbitrary
data. Writes to this register will increment the H_CBWP as long as ME_RDY is 1. When ME_RDY is 0,
writes to this register have no effect and are not delivered to the H_CB, nor is H_CBWP incremented.