Eric Lee / smarc-fsl-linux-kernel

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include/asm-generic/page.h 2.47 KB
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5c01b46bb   Arnd Bergmann   asm-generic: add ... 
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  #ifndef __ASM_GENERIC_PAGE_H
  #define __ASM_GENERIC_PAGE_H
  /*
   * Generic page.h implementation, for NOMMU architectures.
   * This provides the dummy definitions for the memory management.
   */
  
  #ifdef CONFIG_MMU
  #error need to prove a real asm/page.h
  #endif
  
  
  /* PAGE_SHIFT determines the page size */
  
  #define PAGE_SHIFT	12
  #ifdef __ASSEMBLY__
  #define PAGE_SIZE	(1 << PAGE_SHIFT)
  #else
  #define PAGE_SIZE	(1UL << PAGE_SHIFT)
  #endif
  #define PAGE_MASK	(~(PAGE_SIZE-1))
  
  #include <asm/setup.h>
  
  #ifndef __ASSEMBLY__
  
  #define get_user_page(vaddr)		__get_free_page(GFP_KERNEL)
  #define free_user_page(page, addr)	free_page(addr)
  
  #define clear_page(page)	memset((page), 0, PAGE_SIZE)
  #define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)
  
  #define clear_user_page(page, vaddr, pg)	clear_page(page)
  #define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
  
  /*
   * These are used to make use of C type-checking..
   */
  typedef struct {
  	unsigned long pte;
  } pte_t;
  typedef struct {
  	unsigned long pmd[16];
  } pmd_t;
  typedef struct {
  	unsigned long pgd;
  } pgd_t;
  typedef struct {
  	unsigned long pgprot;
  } pgprot_t;
  typedef struct page *pgtable_t;
  
  #define pte_val(x)	((x).pte)
  #define pmd_val(x)	((&x)->pmd[0])
  #define pgd_val(x)	((x).pgd)
  #define pgprot_val(x)	((x).pgprot)
  
  #define __pte(x)	((pte_t) { (x) } )
  #define __pmd(x)	((pmd_t) { (x) } )
  #define __pgd(x)	((pgd_t) { (x) } )
  #define __pgprot(x)	((pgprot_t) { (x) } )
  
  extern unsigned long memory_start;
  extern unsigned long memory_end;
  
  #endif /* !__ASSEMBLY__ */
  
  #ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS
  #define PAGE_OFFSET		(CONFIG_KERNEL_RAM_BASE_ADDRESS)
  #else
  #define PAGE_OFFSET		(0)
  #endif
b7a0556e0   Mark Salter   fixed generic pag... 
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  #ifndef ARCH_PFN_OFFSET
  #define ARCH_PFN_OFFSET		(PAGE_OFFSET >> PAGE_SHIFT)
  #endif
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  #ifndef __ASSEMBLY__
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  #define __va(x) ((void *)((unsigned long) (x)))
  #define __pa(x) ((unsigned long) (x))
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  #define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
  #define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
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  #define virt_to_page(addr)	pfn_to_page(virt_to_pfn(addr))
  #define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))
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  #ifndef page_to_phys
  #define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
  #endif
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  #define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
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  #define	virt_addr_valid(kaddr)	(((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
  				((void *)(kaddr) < (void *)memory_end))
  
  #endif /* __ASSEMBLY__ */
  
  #include <asm-generic/memory_model.h>
  #include <asm-generic/getorder.h>
  
  #endif /* __ASM_GENERIC_PAGE_H */