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kernel/linux-rt-4.4.41/arch/um/include/asm/page.h 3.44 KB
5113f6f70   김현기   kernel add
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  /*
   * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
   * Copyright 2003 PathScale, Inc.
   * Licensed under the GPL
   */
  
  #ifndef __UM_PAGE_H
  #define __UM_PAGE_H
  
  #include <linux/const.h>
  
  /* PAGE_SHIFT determines the page size */
  #define PAGE_SHIFT	12
  #define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
  #define PAGE_MASK	(~(PAGE_SIZE-1))
  
  #ifndef __ASSEMBLY__
  
  struct page;
  
  #include <linux/types.h>
  #include <asm/vm-flags.h>
  
  /*
   * These are used to make use of C type-checking..
   */
  
  #define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
  #define copy_page(to,from)	memcpy((void *)(to), (void *)(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)
  
  #if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
  
  typedef struct { unsigned long pte_low, pte_high; } pte_t;
  typedef struct { unsigned long pmd; } pmd_t;
  typedef struct { unsigned long pgd; } pgd_t;
  #define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32))
  
  #define pte_get_bits(pte, bits) ((pte).pte_low & (bits))
  #define pte_set_bits(pte, bits) ((pte).pte_low |= (bits))
  #define pte_clear_bits(pte, bits) ((pte).pte_low &= ~(bits))
  #define pte_copy(to, from) ({ (to).pte_high = (from).pte_high; \
  			      smp_wmb(); \
  			      (to).pte_low = (from).pte_low; })
  #define pte_is_zero(pte) (!((pte).pte_low & ~_PAGE_NEWPAGE) && !(pte).pte_high)
  #define pte_set_val(pte, phys, prot) \
  	({ (pte).pte_high = (phys) >> 32; \
  	   (pte).pte_low = (phys) | pgprot_val(prot); })
  
  #define pmd_val(x)	((x).pmd)
  #define __pmd(x) ((pmd_t) { (x) } )
  
  typedef unsigned long long pfn_t;
  typedef unsigned long long phys_t;
  
  #else
  
  typedef struct { unsigned long pte; } pte_t;
  typedef struct { unsigned long pgd; } pgd_t;
  
  #ifdef CONFIG_3_LEVEL_PGTABLES
  typedef struct { unsigned long pmd; } pmd_t;
  #define pmd_val(x)	((x).pmd)
  #define __pmd(x) ((pmd_t) { (x) } )
  #endif
  
  #define pte_val(x)	((x).pte)
  
  
  #define pte_get_bits(p, bits) ((p).pte & (bits))
  #define pte_set_bits(p, bits) ((p).pte |= (bits))
  #define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
  #define pte_copy(to, from) ((to).pte = (from).pte)
  #define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
  #define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
  
  typedef unsigned long pfn_t;
  typedef unsigned long phys_t;
  
  #endif
  
  typedef struct { unsigned long pgprot; } pgprot_t;
  
  typedef struct page *pgtable_t;
  
  #define pgd_val(x)	((x).pgd)
  #define pgprot_val(x)	((x).pgprot)
  
  #define __pte(x) ((pte_t) { (x) } )
  #define __pgd(x) ((pgd_t) { (x) } )
  #define __pgprot(x)	((pgprot_t) { (x) } )
  
  extern unsigned long uml_physmem;
  
  #define PAGE_OFFSET (uml_physmem)
  #define KERNELBASE PAGE_OFFSET
  
  #define __va_space (8*1024*1024)
  
  #include <mem.h>
  
  /* Cast to unsigned long before casting to void * to avoid a warning from
   * mmap_kmem about cutting a long long down to a void *.  Not sure that
   * casting is the right thing, but 32-bit UML can't have 64-bit virtual
   * addresses
   */
  #define __pa(virt) to_phys((void *) (unsigned long) (virt))
  #define __va(phys) to_virt((unsigned long) (phys))
  
  #define phys_to_pfn(p) ((pfn_t) ((p) >> PAGE_SHIFT))
  #define pfn_to_phys(pfn) ((phys_t) ((pfn) << PAGE_SHIFT))
  
  #define pfn_valid(pfn) ((pfn) < max_mapnr)
  #define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
  
  #include <asm-generic/memory_model.h>
  #include <asm-generic/getorder.h>
  
  #endif	/* __ASSEMBLY__ */
  
  #ifdef CONFIG_X86_32
  #define __HAVE_ARCH_GATE_AREA 1
  #endif
  
  #endif	/* __UM_PAGE_H */