Mirrors_Framework/nuttx
1
0
Fork 0
mirror of https://github.com/apache/nuttx.git synced 2026-06-07 01:05:54 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add mapping for the page table

Browse Source 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2872 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2010-08-21 02:09:12 +00:00
parent 4512507356
commit 2bb19dab03
6 changed files with 198 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/nuttx/page.h
+39 -14
View File
@@ -77,7 +77,8 @@
#define PG_ALIGNUP(addr) (((addr) + PAGEMASK) & ~PAGEMASK)
/* CONFIG_PAGING_NLOCKED - This is the number of locked pages in the memory
* map. The size of locked address region will then be:
* map. The size of locked address region will then be given by
* PG_LOCKED_SIZE.
*/
#define PG_LOCKED_SIZE (CONFIG_PAGING_NLOCKED << PAGESHIFT)
@@ -87,6 +88,12 @@
* not defined, then this logic will be set to then to CONFIG_DRAM_START
* and CONFIG_DRAM_VSTART (i.e., assuming that the base address of the
* locked region is at the virtual address of the beginning of RAM).
*
* NOTE: In some architectures, it may be necessary to take some memory
* from the beginning of this region for vectors or for a page table.
* In such cases, CONFIG_PAGING_LOCKED_P/VBASE should take that into
* consideration to prevent overlapping the locked memory region and the
* system data at the beginning of SRAM.
*/
#if defined(CONFIG_PAGING_LOCKED_PBASE) && defined(CONFIG_PAGING_LOCKED_VBASE)
@@ -110,10 +117,19 @@
#define PG_PAGED_SIZE (CONFIG_PAGING_NPAGED << PAGESHIFT)
/* This positions the paging Read-Only text section */
/* This positions the paging Read-Only text section. If the configuration
* did not override the default, the paged region will immediately follow
* the locked region.
*/
#if defined(CONFIG_PAGING_LOCKED_PBASE) && defined(CONFIG_PAGING_LOCKED_VBASE)
# define PG_LOCKED_PBASE CONFIG_PAGING_LOCKED_PBASE
# define PG_LOCKED_VBASE CONFIG_PAGING_LOCKED_VBASE
#else
# define PG_PAGED_PBASE PG_LOCKED_PEND
# define PG_PAGED_VBASE PG_LOCKED_VEND
#endif
#define PG_PAGED_PBASE PG_LOCKED_PEND
#define PG_PAGED_VBASE PG_LOCKED_VEND
#define PG_PAGED_PEND (PG_PAGED_PBASE + PG_PAGED_SIZE)
#define PG_PAGED_VEND (PG_PAGED_VBASE + PG_PAGED_SIZE)
@@ -123,23 +139,32 @@
#define PG_TEXT_SIZE (PG_TEXT_NPAGES << PAGESHIFT)
/* CONFIG_PAGING_NDATA - This is the number of data pages in the memory
* map. The size of data address region will then be:
* map. The data region will extend to the end of RAM unless overridden
* by a setting in the configuration file.
*
* NOTE: In some architectures, it may be necessary to take some memory
* from the end of RAM for page tables or other system usage. The
* configuration settings and linker directives must be cognizant of that.
* CONFIG_PAGING_NDATA should be defined to prevent the data region from
* extending all the way to the end of memory.
*/
#define PG_RAM_PAGES (CONFIG_DRAM_SIZE >> PAGESHIFT)
#if PG_RAM_PAGES <= PG_TEXT_NPAGES
#ifdef CONFIG_PAGING_NDATA
# PG_DATA_NPAGES CONFIG_PAGING_NDATA
#elif PG_RAM_PAGES > PG_TEXT_NPAGES
# PG_DATA_NPAGES (PG_RAM_PAGES - PG_TEXT_NPAGES)
#else
# error "Not enough memory for this page layout"
#endif
#ifdef CONFIG_PAGING_NDATA
# PG_DATA_NPAGED CONFIG_PAGING_NDATA
#else
# PG_DATA_NPAGED (PG_RAM_PAGES - PG_TEXT_NPAGES)
#endif
#define PG_DATA_SIZE (PG_DATA_NPAGES << PAGESHIFT)
#define PG_DATA_SIZE (CONFIG_PAGING_NPAGED << PAGESHIFT)
/* This positions the Read/Write data region */
/* This positions the Read/Write data region. If the configuration
* did not override the default, the paged region will immediately follow
* the paged region and will extend to the end of memory.
*/
#if defined(CONFIG_PAGING_DATA_PBASE) && defined(CONFIG_PAGING_DATA_VBASE)
# define PG_DATA_PBASE CONFIG_PAGING_DATA_PBASE