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 phys_addr_t cma_get_base(struct cma *cma);
  19 extern unsigned long cma_get_size(struct cma *cma);
  20
  21 extern int __init cma_declare_contiguous(phys_addr_t size,
  22                         phys_addr_t base, phys_addr_t limit,
  23                         phys_addr_t alignment, unsigned int order_per_bit,
  24                         bool fixed, struct cma **res_cma);
  25 extern int cma_init_reserved_mem(phys_addr_t size,
  26                                         phys_addr_t base, int order_per_bit,
  27                                         struct cma **res_cma);
  28 extern struct page *cma_alloc(struct cma *cma, int count, unsigned int align);
  29 extern bool cma_release(struct cma *cma, struct page *pages, int count);
  30 #endif