diff options
| -rw-r--r-- | include/linux/memblock.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 47bceb18705..c914112cd24 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -64,6 +64,7 @@ extern int memblock_find(struct memblock_region *res); extern void memblock_dump_all(void); +/* Obsolete accessors */ static inline u64 memblock_size_bytes(struct memblock_type *type, unsigned long region_nr) { @@ -86,6 +87,57 @@ memblock_end_pfn(struct memblock_type *type, unsigned long region_nr) memblock_size_pages(type, region_nr); } +/* + * pfn conversion functions + * + * While the memory MEMBLOCKs should always be page aligned, the reserved + * MEMBLOCKs may not be. This accessor attempt to provide a very clear + * idea of what they return for such non aligned MEMBLOCKs. + */ + +/** + * memblock_region_base_pfn - Return the lowest pfn intersecting with the region + * @reg: memblock_region structure + */ +static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg) +{ + return reg->base >> PAGE_SHIFT; +} + +/** + * memblock_region_last_pfn - Return the highest pfn intersecting with the region + * @reg: memblock_region structure + */ +static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg) +{ + return (reg->base + reg->size - 1) >> PAGE_SHIFT; +} + +/** + * memblock_region_end_pfn - Return the pfn of the first page following the region + * but not intersecting it + * @reg: memblock_region structure + */ +static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg) +{ + return memblock_region_last_pfn(reg) + 1; +} + +/** + * memblock_region_pages - Return the number of pages covering a region + * @reg: memblock_region structure + */ +static inline unsigned long memblock_region_pages(const struct memblock_region *reg) +{ + return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg); +} + +#define for_each_memblock(memblock_type, region) \ + for (region = memblock.memblock_type.regions; \ + region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ + region++) + + #endif /* __KERNEL__ */ #endif /* _LINUX_MEMBLOCK_H */ |