#ifndef __CMA_H__
  #define __CMA_H__
  
  /*
   * There is always at least global CMA area and a few optional
   * areas configured in kernel .config.
   */
  #ifdef CONFIG_CMA_AREAS
  #define MAX_CMA_AREAS	(1 + CONFIG_CMA_AREAS)
  
  #else
  #define MAX_CMA_AREAS	(0)
  
  #endif
  
  struct cma;

  extern unsigned long totalcma_pages;

  extern phys_addr_t cma_get_base(const struct cma *cma);
  extern unsigned long cma_get_size(const struct cma *cma);

  extern int __init cma_declare_contiguous(phys_addr_t base,
  			phys_addr_t size, phys_addr_t limit,

  			phys_addr_t alignment, unsigned int order_per_bit,

  			bool fixed, struct cma **res_cma);

  extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
  					unsigned int order_per_bit,

  					struct cma **res_cma);

  extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align);

  extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);

  #endif