dataSegPad.c
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上传日期:2022-06-26
资源大小:412k
文件大小:1k
源码类别:
VxWorks
开发平台:
C/C++
- /* dataSegPad.c - padding for beginning of data segment */
- /* Copyright 1984-1991 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- modification history
- --------------------
- 01c,19oct92,jcf change to include when INCLUDE_MMU_FULL defined.
- 01b,28jul92,rdc changed PAGE_SIZE to VM_PAGE_SIZE.
- 01a,21jul92,rdc written.
- */
- /*
- DESCRIPTION
- This module conditionally creates a data structure the size of one page;
- it is explicility listed as the first module on the load line when VxWorks
- is linked to insure that this data structure is the first item in the
- data segment. This mechanism is needed to insure that the data segment
- does not overlap a page that is occupied by the text segment; when text
- segment protection is turned on, all pages that contain text are write
- protected. This insures that the data segment does not lie in a page that
- has been write protected. If text segment protection has not been included,
- this module compiles into a null object module. In an embedded system, this
- mechanism may not be needed if the loader explicitly places the data segment
- in a section of memory seperate from the text segment.
- */
- #include "vxWorks.h"
- #include "config.h"
- #ifdef INCLUDE_MMU_FULL /* bootroms will not ref dataSegPad.o */
- char dataSegPad [VM_PAGE_SIZE] = {1};
- #endif /* INCLUDE_MMU_FULL */