Intel Itanium Processor 9500 Series Processor Block Diagram - Intel BX80569Q9550 - Core 2 Quad 2.83 GHz Processor Datasheet

Introduction
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Figure 1-2. Intel Itanium
The Intel QPI viral and poison fields are used to flag corrupted system state and bad
data accordingly. Once it has "gone viral", an Intel QPI agent will set the viral field
within all packet headers. Viral mode is entered in three ways: receiving a viral packet,
upon a detecting fatal/panic error, or when a global viral signal (from Cboxes) is
asserted. Viral is cleared on Reset. Poisoning is used to indicate bad data on a per-flit
basis. Poison does not indicate corrupted system coherency, but rather that a particular
block of data is not reliable.
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Intel Itanium
includes implementations of Power/Performance states (P-states) and Halt states (C-
states). For the PAL Halt state interface and architected specifications of the PAL P-
state interface, see the Intel
Volume 2, Section 11.6. PAL controls the Intel
processor power through a special built-in microcontroller that manipulates voltage and
frequency. PAL communicates requested P-states to this controller through internal
registers.
As shown in
components: Processor Abstraction Layer (PAL), System Abstraction Layer (SAL),
Unified Extensible Firmware Interface (UEFI) and Advanced Configuration and Power
Interface (ACPI). PAL, SAL, UEFI and ACPI together provide processor and system
initialization for an operating system boot. PAL and SAL provide machine check abort
handling. PAL, SAL, UEFI and ACPI provide various run-time services for system
functions which may vary across implementations. The interactions of the various
services that PAL, SAL, UEFI and ACPI provide are illustrated in
context of this model and throughout the rest of this chapter, the System Abstraction
Layer (SAL) is a firmware layer which isolates operating system and other higher level
software from implementation differences in the platform, while PAL is the firmware
layer that abstracts the processor implementation.
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Intel Itanium Processor 9300 Series and 9500 Series Datasheet
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Processor 9500 Series Processor Block Diagram
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Processor 9500 Series PAL's Demand Based Switching (DBS) support
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Itanium
Figure 1-3, Itanium architecture-based firmware consists of several major
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Architecture Software Developer's Manual,
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Itanium Processor 9500 Series
Figure 1-3. In the
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