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Datasheet, Volume 2 17
Processor Configuration Registers
2.2 System Address Map
Note: The processor’s Multi Chip Package (MCP) conceptually consists of the processor and
the north bridge chipset (GMCH) combined together in a single package. Hence, this
section will have references to the processor as well as GMCH (or MCH) address
mapping.
The MCP supports 64 GB (36 bit) of addressable memory space and 64 KB+3 of
addressable I/O space. With the new QPI interface, the processor performs decoding
that historically occurred within the GMCH. Specifically, the GMCH address decoding for
processor initiated PAM, 15 MB–16 MB ISA hole, SMM CSEG/TSEG, PCIexBAR, and
DRAM accesses will occur within the processor and the GMCH has no direct knowledge.
In addition, the ME (device 3) will move to the PCH, so ME associated register ranges
have been removed from the graphics controller. This section focuses on how the
memory space is partitioned and what the separate memory regions are used for. I/O
address space has simpler mapping and is explained near the end of this section.
The MCP supports PEG port upper prefetchable base/limit registers. This allows the PEG
unit to claim IO accesses above 36 bit, complying with the PCI Express Base
Specificaiton 2.1. Addressing of greater than 4 GB is allowed on either the DMI
Interface or PCI Express interface. The MCP supports a maximum of 16 GB of DRAM.
No DRAM memory will be accessible above 16 GB. DRAM capacity is limited by the
number of address pins available.
When running in internal graphics mode, Tilex/Tiley/linear reads/writes to GMADR
range are supported. Write accesses to GMADR linear regions are supported from both
DMI and PEG. GMADR write accesses to tileX and tileY regions (defined using fence
registers) are not supported from DMI or the PEG port. GMADR read accesses are not
supported from either DMI or PEG.
In the following sections, it is assumed that all of the compatibility memory ranges
reside on the DMI Interface. The exception to this rule is VGA ranges, which may be
mapped to PCI Express*, or DMI, or to the internal graphics device (IGD). In the
absence of more specific references, cycle descriptions referencing PCI should be
interpreted as the DMI Interface/PCI, while cycle descriptions referencing PCI Express
or IGD are related to the PCI Express bus or the internal graphics device respectively.
The processor does not remap APIC or any other memory spaces above TOLUD (Top of
Low Usable DRAM). The TOLUD register is set to the appropriate value by BIOS. The
remapbase/remaplimit registers remap logical accesses bound for addresses above
4 GB onto physical addresses that fall within DRAM.
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