12th Generation Intel® Core™ Processors Datasheet Volume 2 of 2
ID | Date | Version | Classification |
---|---|---|---|
767625 | 07/13/2023 | Public |
Graphics Translation Table Memory Mapped Range Address (GTTMMADR0_0_2_0_PCI) – Offset 10
This register requests allocation for the combined Graphics Translation Table Modification Range and Memory Mapped Range. The range requires 16 MB combined for MMIO and Global GTT aperture, with 2MB of that used by MMIO, 6MB reserved, and 8MB used by GTT. GTTADR will begin at (GTTMMADR + 8 MB) while the MMIO base address will be the same as GTTMMADR. The region between (GTTMMADR + 2MB) - (GTTMMADR + 8MB) is reserved. For the Global GTT, this range is defined as a memory BAR in graphics device configuration space. It is an alias into which software is required to write Page Table Entry values (PTEs). Software may read PTE values from the global Graphics Translation Table (GTT). PTEs cannot be written directly into the global GTT memory area. The device snoops writes to this region in order to invalidate any cached translations within the various TLBs implemented on-chip. The allocation is for 16MB and the base address is defined by bits [38:24].
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
31:24 | 0x0 | RW/V | Memory Base Address (MBA_0) Set by the OS, these bits correspond to address signals [63:24]. |
23:4 | 0x0 | RO | Address Mask (ADM) Hardwired to 0s to indicate at least 16MB address range. |
3 | 0x0 | RO | Prefetchable Memory (PREFMEM) Hardwired to 0 to prevent prefetching. |
2:1 | 0x2 | RO | Memory Type (MEMTYP) Hardwired to 2h to indicate 64 bit base address. |
0 | 0x0 | RO | Memory I/O Space (MIOS) Hardwired to 0 to indicate memory space. |