12th Generation Intel® Core™ Processor Datasheet Volume 2 of 2
ID | Date | Version | Classification |
---|---|---|---|
767626 | 07/13/2023 | Public |
PCI Express Egress Port Base Address (PXPEPBAR_0_0_0_PCI) – Offset 40
This is the base address for the PCI Express Egress Port MMIO Configuration space. There is no physical memory within this 4KB window that can be addressed. The 4KB reserved by this register does not alias to any PCI 2.3 compliant memory mapped space. On reset, the EGRESS port MMIO configuration space is disabled and must be enabled by writing a 1 to PXPEPBAREN [Dev 0, offset 40h, bit 0].
All the bits in this register are locked in Intel TXT mode.
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
63:42 | 0h | RO | Reserved |
41:12 | 0x0 | RW | (PXPEPBAR) This field corresponds to bits 41 to 12 of the base address PCI Express Egress Port MMIO configuration space. BIOS will program this register resulting in a base address for a 4KB block of contiguous memory address space. This register ensures that a naturally aligned 4KB space is allocated within the first 512GB of addressable memory space. System Software uses this base address to program the PCI Express Egress Port MMIO register set. All the bits in this register are locked in Intel TXT mode. |
11:1 | 0h | RO | Reserved |
0 | 0x0 | RW | PXPEPBAR Enable (PXPEPBAREN) 0: PXPEPBAR is disabled and does not claim any memory |