include/linux/cma.h

   1 #ifndef __CMA_H__
   2 #define __CMA_H__
   3
   4 /*
   5  * There is always at least global CMA area and a few optional
   6  * areas configured in kernel .config.
   7  */
   8 #ifdef CONFIG_CMA_AREAS
   9 #define MAX_CMA_AREAS   (1 + CONFIG_CMA_AREAS)
  10
  11 #else
  12 #define MAX_CMA_AREAS   (0)
  13
  14 #endif
  15
  16 struct cma;
  17
  18 extern unsigned long totalcma_pages;
  19 extern phys_addr_t cma_get_base(const struct cma *cma);
  20 extern unsigned long cma_get_size(const struct cma *cma);
  21
  22 extern int __init cma_declare_contiguous(phys_addr_t base,
  23                         phys_addr_t size, phys_addr_t limit,
  24                         phys_addr_t alignment, unsigned int order_per_bit,
  25                         bool fixed, struct cma **res_cma);
  26 extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
  27                                         unsigned int order_per_bit,
  28                                         struct cma **res_cma);
  29 extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align);
  30 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
  31 #endif