參數(shù)資料
型號: Alpha 21164
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Alpha Microprocessor(64位微處理器)
中文描述: 阿爾法微處理器(64位微處理器)
文件頁數(shù): 60/115頁
文件大?。?/td> 846K
代理商: ALPHA 21164
60
PALcode
PALcode Entry Points
9 PALcode
Privileged architecture library code (PALcode) is macrocode that provides an archi-
tecturally defined operating-system-specific programming interface that is common
across all Alpha microprocessors. The actual implementation of PALcode differs for
each operating system.
PALcode runs with privileges enabled, instruction stream (Istream) mapping dis-
abled, and interrupts disabled. PALcode has privilege to use five special opcodes
that allow functions such as physical data stream (Dstream) references and internal
processor register (IPR) manipulation.
PALcode can be invoked by the following events:
Reset
System hardware exceptions (MCHK, ARITH)
Memory-management exceptions
Interrupts
CALL_PAL instructions
9.1 PALcode Entry Points
PALcode is invoked at specific entry points. The 21164 has two types of PALcode
entry points:
CALL_PAL entry points are used whenever the IDU encounters a CALL_PAL
instruction in the Istream.
Privileged CALL_PAL instructions start at offset 2000
16
.
Unprivileged CALL_PAL instructions start at offset 3000
16
.
Chip-specific trap entry points start PALcode.
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