12th Generation Intel® Core™ Processors Datasheet Volume 2 of 2
ID | Date | Version | Classification |
---|---|---|---|
767625 | 07/13/2023 | Public |
BIOS Mailbox Interface (BIOS_Mailbox_Interface_0_0_0_MCHBAR_PCU) – Offset 5DA4
Control and Status register for the BIOS-to-Firmware
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
31 | 0x0 | RW/1S/V | Run/Busy Bit (RUN_BUSY) SW may write to the two mailbox registers only when RUN_BUSY is cleared (0b). After setting this bit, SW will poll this bit until it is cleared. |
30:29 | 0h | RO | Reserved |
28:16 | 0x0 | RW/V | (PARAM2) This field contains additional parameters associated with specific commands. These are documented in the BIOS Writers Guide |
15:8 | 0x0 | RW/V | (PARAM1) This field contains additional parameters associated with specific commands. These are documented in the BIOS Writers Guide |
7:0 | 0x0 | RW/V | (COMMAND) On RUN_BUSY assertion this field should contain the SW request command, on RUN_BUSY deassrtion this field will contain the Firmware response code |