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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)： | 98/118頁(yè) |
| 文件大小： | 356K |
| 代理商： | HIF_SPEC |
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4–2
Host Interface (HIF) Specification
98
Startup Initialization
Initialization procedures must establish appropriate values for the general
registers mentioned below. In addition, file descriptors for the standard input
and output devices must be opened.
Register Stack Pointer
(
gr1
)
The register stack pointer (
rsp
) register contains the main memory address in
which the local register
lr0
will be saved, and from which it will be restored.
The content of
rsp
is compared to the content of
rab
to determine when it is
necessary to spill part of the local register stack to memory. On startup, the
values in
rab,
rsp
, and
rfb
should be initialized to prevent a spill trap from
occurring on entry to the
crt0
code, as shown by the following relations:
256 +
rab
≤
rsp
<
rfb
rfb
=
rab
+ 512
This provides the
crt0
code with at least 64 registers on entry, which should be
a sufficient number to accomplish its purpose. Before entering
crt0
, the startup
initialization code must load the Am29027 processor’s mode register value
into global registers
gr96
and
gr97
. Register
gr96
contains the most significant
half of the mode register value, and
gr97
contains the least significant half.
Memory Stack Pointer (gr125)
The memory stack pointer (
msp
) register points to the top of the memory stack,
or the lowest addressed entry on the memory stack. This register must be
preserved (or, more conventionally, restored).
Register Allocate Bound (gr126)
The register allocate bound (
rab
) register contains the register stack address of
the lowest addressed word contained within the register file.
rab
is referenced
in the prologue of most user program functions to determine whether a register
spill operation is necessary to accommodate the local register requirements of
the called function.
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