root/arch/um/include/asm/page.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
   4  * Copyright 2003 PathScale, Inc.
   5  */
   6 
   7 #ifndef __UM_PAGE_H
   8 #define __UM_PAGE_H
   9 
  10 #include <linux/const.h>
  11 
  12 /* PAGE_SHIFT determines the page size */
  13 #define PAGE_SHIFT      12
  14 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  15 #define PAGE_MASK       (~(PAGE_SIZE-1))
  16 
  17 #ifndef __ASSEMBLY__
  18 
  19 struct page;
  20 
  21 #include <linux/pfn.h>
  22 #include <linux/types.h>
  23 #include <asm/vm-flags.h>
  24 
  25 /*
  26  * These are used to make use of C type-checking..
  27  */
  28 
  29 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  30 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  31 
  32 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  33 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  34 
  35 #if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
  36 
  37 typedef struct { unsigned long pte; } pte_t;
  38 typedef struct { unsigned long pmd; } pmd_t;
  39 typedef struct { unsigned long pgd; } pgd_t;
  40 #define pte_val(p) ((p).pte)
  41 
  42 #define pte_get_bits(p, bits) ((p).pte & (bits))
  43 #define pte_set_bits(p, bits) ((p).pte |= (bits))
  44 #define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
  45 #define pte_copy(to, from) ({ (to).pte = (from).pte; })
  46 #define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
  47 #define pte_set_val(p, phys, prot) \
  48         ({ (p).pte = (phys) | pgprot_val(prot); })
  49 
  50 #define pmd_val(x)      ((x).pmd)
  51 #define __pmd(x) ((pmd_t) { (x) } )
  52 
  53 typedef unsigned long long phys_t;
  54 
  55 #else
  56 
  57 typedef struct { unsigned long pte; } pte_t;
  58 typedef struct { unsigned long pgd; } pgd_t;
  59 
  60 #ifdef CONFIG_3_LEVEL_PGTABLES
  61 typedef struct { unsigned long pmd; } pmd_t;
  62 #define pmd_val(x)      ((x).pmd)
  63 #define __pmd(x) ((pmd_t) { (x) } )
  64 #endif
  65 
  66 #define pte_val(x)      ((x).pte)
  67 
  68 
  69 #define pte_get_bits(p, bits) ((p).pte & (bits))
  70 #define pte_set_bits(p, bits) ((p).pte |= (bits))
  71 #define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
  72 #define pte_copy(to, from) ((to).pte = (from).pte)
  73 #define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
  74 #define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
  75 
  76 typedef unsigned long phys_t;
  77 
  78 #endif
  79 
  80 typedef struct { unsigned long pgprot; } pgprot_t;
  81 
  82 typedef struct page *pgtable_t;
  83 
  84 #define pgd_val(x)      ((x).pgd)
  85 #define pgprot_val(x)   ((x).pgprot)
  86 
  87 #define __pte(x) ((pte_t) { (x) } )
  88 #define __pgd(x) ((pgd_t) { (x) } )
  89 #define __pgprot(x)     ((pgprot_t) { (x) } )
  90 
  91 extern unsigned long uml_physmem;
  92 
  93 #define PAGE_OFFSET (uml_physmem)
  94 #define KERNELBASE PAGE_OFFSET
  95 
  96 #define __va_space (8*1024*1024)
  97 
  98 #include <mem.h>
  99 
 100 /* Cast to unsigned long before casting to void * to avoid a warning from
 101  * mmap_kmem about cutting a long long down to a void *.  Not sure that
 102  * casting is the right thing, but 32-bit UML can't have 64-bit virtual
 103  * addresses
 104  */
 105 #define __pa(virt) to_phys((void *) (unsigned long) (virt))
 106 #define __va(phys) to_virt((unsigned long) (phys))
 107 
 108 #define phys_to_pfn(p) ((p) >> PAGE_SHIFT)
 109 #define pfn_to_phys(pfn) PFN_PHYS(pfn)
 110 
 111 #define pfn_valid(pfn) ((pfn) < max_mapnr)
 112 #define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
 113 
 114 #include <asm-generic/memory_model.h>
 115 #include <asm-generic/getorder.h>
 116 
 117 #endif  /* __ASSEMBLY__ */
 118 
 119 #ifdef CONFIG_X86_32
 120 #define __HAVE_ARCH_GATE_AREA 1
 121 #endif
 122 
 123 #endif  /* __UM_PAGE_H */