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| 型號： | HIF_SPEC |
| 英文描述： | EZ-030 Demonstration Board Theory of Operation Host Interface (HIF) Specification |
| 中文描述： | 易- 030演示板的經(jīng)營理論主機接口（誘導因子）規(guī)格 |
| 文件頁數(shù)： | 18/118頁 |
| 文件大?。?/td> | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
2–1
Chapter 2
System Call Mechanism
System calls on 29K processor-based systems are accomplished through
invocation of a specific software trap. The 29K processor traps are roughly
equivalent to software interrupts on other CPUs. System call traps are invoked
through execution of an appropriate assert instruction whose assertion is
FALSE at the time the instruction is executed.
Execution of an
ASEQ
,
ASGE
,
ASGEU
,
ASGT
,
ASGTU
,
ASLE
,
ASLEU
,
ASLT
,
ASLTU
, or
ASNEQ
instruction, where the result of the assertion is
FALSE, will cause the trap specified in the instruction to be taken.
Once the trap is invoked, the 29K Family processor accesses a trap vector
contained in a table of 256 separate trap handler addresses.
With the Am29000 and Am29050 microprocessors, the operating system
software may implement direct trap execution for increased efficiency,
(although in most implementations, the table of vectors is used). Since the
need for a vector table lookup is not required, this solution offers an efficiency
gain, even though it requires the reservation of a much greater amount of
system memory.
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