Advanced Configuration and Power Interface Specification

ACPI Platform Error Interfaces (APEI)
Value Name Description
0x0A ADD_VALUE Adds the contents of the specified register region to Value and
stores the result in the register region.
0x0B SUBTRACT_VALUE Subtracts Value from the contents of the specified register
region and stores the result in the register region.
0x0C STALL Stall for the number of microseconds specified in Value.
0x0D STALL_WHILE_TRUE OSPM continually compares the contents of the specified
register region to Value until the values are not equal. OSPM
stalls between each successive comparison. The amount of time
to stall is specified by VAR1 and is expressed in microseconds.
0x0E
SKIP_NEXT_INSTRUCTION_I
F_TRUE
This is a control instruction which compares the contents of the
register region with Value. If the values match, OSPM skips the
next instruction in the sequence for the current action.
0x0F GOTO OSPM will go to the instruction specified by Value. The
instruction is specified as the zero-based index. Each
instruction for a given action has an index based on its relative
position in the array of instructions for the action.
0x10 SET_SRC_ADDRESS_BASE Sets the SRC_BASE variable used by the MOVE_DATA
instruction to the contents of the register region.
0x11 SET_DST_ADDRESS_BASE Sets the DST_BASE variable used by the MOVE_DATA
instruction to the contents of the register region.
0x12 MOVE_DATA Moves VAR2 bytes of data from SRC_BASE + Offset to
DST_BASE + Offset, where Offset is the contents of the register
region.
The Flags field allows qualifying flags to be associated with the instruction. Table 18-338 identifies
the flags that can be associated with Serialization Instructions.
Table 18-338 Instruction Flags
Value Name Description
0x01 PRESERVE_REGISTER For WRITE_REGISTER and WRITE_REGISTER_VALUE
instructions, this flag indicates that bits within the register that
are not being written must be preserved rather than destroyed.
For READ_REGISTER instructions, this flag is ignored.
18.5.1.2.1 READ_REGISTER_VALUE
A read register value instruction reads the register region and compares the result with the specified
value. If the values are not equal, the instruction failed. This can be described in pseudo code as
follows:
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