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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(dǎo)因子）規(guī)格 |
| 文件頁數(shù)： | 15/118頁 |
| 文件大?。?/td> | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
1–5
HIF Concepts
Programmers developing software in a high-level language do not work
directly with the processor. Instead, they think in terms of a virtual machine
ideally suited to the computational paradigm of the language. For instance, the
C-language virtual machine has operations such as
fprintf()
and
strcpy()
, and
the FORTRAN machine has operations such as
alog
and
sqrt
.
In actual practice, these virtual machines are implemented by libraries of
object code that perform language-specific operations. As long as programmers
use only the functions of the language’s implied virtual machine, the programs
will be portable across a broad range of implementations of the language.
However, computer systems generally provide another virtual machine to the
world: one that is defined by the operating system software. This virtual
machine requires system calls to perform the services that are implemented
within the operating system code. Typical services are: process management,
file system management, device management, and memory management.
The high-level language virtual machine usually consists of: 1) functions that
can be implemented entirely within library routines, and 2) functions that
require the services of the operating system. The functions of the first group
(usually defined as the standard library for that language) are independent of
the operating system virtual machine on which they are implemented. The
functions of the second group must be coded in terms of the operating system
virtual machine. In other words, they must make system calls.
Making system calls is often useful for end-users, even though this practice
makes their programs less portable. This requirement can be accommodated by
augmenting the language library with glue routines that specifically invoke the
system calls, while providing the end-user with suitable high-level syntax and
semantics.
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