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| 型號(hào)： | 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(yíng)理論主機(jī)接口（誘導(dǎo)因子）規(guī)格 |
| 文件頁(yè)數(shù)： | 20/118頁(yè) |
| 文件大?。?/td> | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
2–3
20
HIF Service Invocation
Before invoking HIF services, the service number and any input parameters to
be passed must be loaded into the general registers of the 29K processor. Both
local and global registers are used for various HIF services, as shown in the
HIF Service Calls table on page A–1. Details for invoking specific services are
contained in the “HIF Service Routines” chapter.
Service Number
Every HIF system service is identified by a unique number. Service numbers
0–127 and 256–383 are reserved for use by AMD and should not be used for
user-supplied extensions.
The service number must be loaded into global register
gr121
, the trap-handler
argument register. Global register
gr121
is a temporary register and its value is
not
preserved over a system call, nor will its value be preserved over any trap
invoked by the running program.
Input Parameters
Any input parameters to be passed must be placed in local registers
lr2
through
lr17
. See the appropriate 29K Family processor documentation for specific
details describing the parameter-passing mechanism.
Invoking a HIF Service
The HIF services are accessed by forcing trap 69 to occur, after the service
number and parameters (if any) are loaded in the designated registers. Trap
handler 69 executes the service in supervisor mode.
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