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asm/sections: add helpers to check for section data
Add a helper to check if an object (given an address and a size) is part of a section (given beginning and end addresses). For convenience, also provide a helper that performs this check for __init data using the __init_begin and __init_end limits. Signed-off-by: Thierry Reding <treding@nvidia.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -4,6 +4,7 @@
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/* References to section boundaries */
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#include <linux/compiler.h>
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#include <linux/types.h>
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/*
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* Usage guidelines:
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@ -63,4 +64,68 @@ static inline int arch_is_kernel_data(unsigned long addr)
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}
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#endif
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/**
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* memory_contains - checks if an object is contained within a memory region
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* @begin: virtual address of the beginning of the memory region
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* @end: virtual address of the end of the memory region
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* @virt: virtual address of the memory object
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* @size: size of the memory object
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*
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* Returns: true if the object specified by @virt and @size is entirely
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* contained within the memory region defined by @begin and @end, false
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* otherwise.
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*/
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static inline bool memory_contains(void *begin, void *end, void *virt,
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size_t size)
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{
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return virt >= begin && virt + size <= end;
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}
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/**
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* memory_intersects - checks if the region occupied by an object intersects
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* with another memory region
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* @begin: virtual address of the beginning of the memory regien
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* @end: virtual address of the end of the memory region
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* @virt: virtual address of the memory object
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* @size: size of the memory object
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*
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* Returns: true if an object's memory region, specified by @virt and @size,
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* intersects with the region specified by @begin and @end, false otherwise.
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*/
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static inline bool memory_intersects(void *begin, void *end, void *virt,
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size_t size)
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{
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void *vend = virt + size;
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return (virt >= begin && virt < end) || (vend >= begin && vend < end);
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}
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/**
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* init_section_contains - checks if an object is contained within the init
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* section
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* @virt: virtual address of the memory object
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* @size: size of the memory object
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*
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* Returns: true if the object specified by @virt and @size is entirely
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* contained within the init section, false otherwise.
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*/
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static inline bool init_section_contains(void *virt, size_t size)
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{
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return memory_contains(__init_begin, __init_end, virt, size);
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}
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/**
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* init_section_intersects - checks if the region occupied by an object
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* intersects with the init section
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* @virt: virtual address of the memory object
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* @size: size of the memory object
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*
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* Returns: true if an object's memory region, specified by @virt and @size,
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* intersects with the init section, false otherwise.
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*/
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static inline bool init_section_intersects(void *virt, size_t size)
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{
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return memory_intersects(__init_begin, __init_end, virt, size);
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}
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#endif /* _ASM_GENERIC_SECTIONS_H_ */
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