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Add README files and configuration support for the shared memory logic

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Gregory Nutt
2014-09-23 07:11:47 -06:00
parent 826f703669
commit 242d5f2068
10 changed files with 656 additions and 423 deletions
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include/nuttx/addrenv.h
+33 -2
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@@ -168,11 +168,42 @@
/* A single page scratch region used for temporary mappings */
# define ARCH_SCRATCH_VBASE ARCH_STACK_VEND
# define __ARCH_SHM_VBASE ARCH_STACK_VEND
#else
/* A single page scratch region used for temporary mappings */
# define ARCH_SCRATCH_VBASE ARCH_HEAP_VEND
# define __ARCH_SHM_VBASE ARCH_HEAP_VEND
#endif
/* Shared memory regions */
#ifdef CONFIG_MM_SHM
# ifndef CONFIG_ARCH_SHM_VBASE
# error CONFIG_ARCH_SHM_VBASE not defined
# define CONFIG_ARCH_SHM_VBASE __ARCH_SHM_VBASE
# endif
# if (CONFIG_ARCH_SHM_VBASE & CONFIG_MM_MASK) != 0
# error CONFIG_ARCH_SHM_VBASE not aligned to page boundary
# endif
# ifndef CONFIG_ARCH_SHM_MAXREGIONS
# warning CONFIG_ARCH_SHM_MAXREGIONS not defined
# define CONFIG_ARCH_SHM_MAXREGIONS 1
# endif
# ifndef CONFIG_ARCH_SHM_NPAGES
# warning CONFIG_ARCH_SHM_NPAGES not defined
# define CONFIG_ARCH_SHM_NPAGES 1
# endif
# define ARCH_SHM_REGIONSIZE (CONFIG_ARCH_SHM_NPAGES * CONFIG_MM_PGSIZE)
# define ARCH_SHM_SIZE (CONFIG_ARCH_SHM_MAXREGIONS * ARCH_SHM_REGIONSIZE)
# define ARCH_SHM_VEND (CONFIG_ARCH_SHM_VBASE + ARCH_SHM_SIZE)
# define ARCH_SCRATCH_VBASE ARCH_SHM_VEND
#else
# define ARCH_SCRATCH_VBASE __ARCH_SHM_VBASE
#endif
/* There is no need to use the scratch memory region if the page pool memory