Advanced Configuration and Power Interface Specification

ACPI Platform Error Interfaces (APEI)
Error Status
Address
Notification
Structure
Error Status Block
Length
12 20 Generic Address Structure as defined in Section 5.2.3.2 of the
ACPI Specification.
This field specifies the location of a register that contains the
physical address of a block of memory that holds the error
status data for this error source. This range of memory must
reside in firmware reserved memory. OSPM maps this range
into system address space and reads the error status
information from the mapped address.
28 32 Hardware Error Notification Structure as defined in Table 18-
332. This structure specifies how this error source notifies
OSPM that an error has occurred.
4 60 Identifies the length in bytes of the error status data block.
The Error Status Address field specifies the location of an 8-byte memory-mapped register that
holds the physical address of the error status block. This error status block must reside in a range of
memory reported to OSPM as firmware reserved. OSPM maps the error status buffer into system
address space in order to read the error data.
18.3.2.6.1 Generic Error Data
The Error Status Block contains the error status information for a given generic error source. OSPM
provides an error handler that formats one or more of these blocks as necessary for the specific
operating system.
The generic error status block includes two levels of information. The top level is a Generic Error
Status Block structure and is defined in Table 18-330. Following the Generic Error Status Block
structure are one or more Generic Error Data Entry structures, defined in Table 18-331.
Table 18-330 Generic Error Status Block
Field
Byte
Length
Byte
Offset
Description
Block Status 4 0 Indicates the type of error information reported in the error packet.
Bit [0] - Uncorrectable Error Valid: If set to one, indicates that an
uncorrectable error condition exists.
Bit [1] - Correctable Error Valid: If set to one, indicates that a
correctable error condition exists.
Bit [2] - Multiple Uncorrectable Errors: If set to one, indicates that
more than one uncorrectable errors have been detected.
Bit [3] - Multiple Correctable Errors: If set to one, indicates that
more than one correctable errors have been detected.
Bit [13:4] - Error Data Entry Count: This value indicates the
number of Error Data Entries found in the Data section.
Bit [31:14] - Reserved
Raw Data Offset 4 4 Offset in bytes from the beginning of the Error Status Block to raw
error data. The raw data must follow any Generic Error Data
Entries.
Raw Data Length 4 8 Length in bytes of the raw data.
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