linux/arch/um/include/asm/page.h
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   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
  19struct 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
  37typedef struct { unsigned long pte; } pte_t;
  38typedef struct { unsigned long pmd; } pmd_t;
  39typedef 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
  53typedef unsigned long long phys_t;
  54
  55#else
  56
  57typedef struct { unsigned long pte; } pte_t;
  58typedef struct { unsigned long pgd; } pgd_t;
  59
  60#ifdef CONFIG_3_LEVEL_PGTABLES
  61typedef 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
  76typedef unsigned long phys_t;
  77
  78#endif
  79
  80typedef struct { unsigned long pgprot; } pgprot_t;
  81
  82typedef 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
  91extern 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 */
 124
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