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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)： | 25/118頁 |
| 文件大小： | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
3–1
Chapter 3
HIF Service Routines
The HIF service routine calls currently defined are listed by decimal service
number in Table 3–1, and in alphabetical order in Table 3–2. Descriptions of
the individual services follow on the remaining pages of this chapter, and are
listed in order of service number. Table 3–3 describes the parameter names
used in the service descriptions.
Most HIF calls are similar or identical to equivalent UNIX operating- system
calls. The titles given in the tables are not the names that actually exist in a
particular library but, instead, are the generic names of the services.
Service numbers 0–127 and 256–383 are reserved by AMD and should not be
used for user-supplied extensions.
Each service description on the following pages contains a concise explanation
of the purpose of the service, the input and result register contents, and
example assembly-language code to invoke the service. In all cases,
operating-system kernel services meeting the HIF specifications are invoked
by forcing the software trap 69 to occur. The service number is always
contained in general register
gr121
and parameters are passed, if necessary, in
local registers beginning with
lr2
.
When the service returns, general register
gr121
is required to report the
success or failure of the service. If successful,
gr121
is expected to contain a
TRUE boolean value (a 1 bit in the most significant bit position). If the service
is not successful, a positive nonzero error code is returned in
gr121
. If the
service returns results, the first result is held in
gr96
, the second in
gr97
, and
so forth.
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