LXR linux/arch/alpha/include/asm/page.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ALPHA_PAGE_H
   3#define _ALPHA_PAGE_H
   4
   5#include <linux/const.h>
   6#include <asm/pal.h>
   7
   8/* PAGE_SHIFT determines the page size */
   9#define PAGE_SHIFT      13
  10#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  11#define PAGE_MASK       (~(PAGE_SIZE-1))
  12
  13#ifndef __ASSEMBLY__
  14
  15#define STRICT_MM_TYPECHECKS
  16
  17extern void clear_page(void *page);
  18#define clear_user_page(page, vaddr, pg)        clear_page(page)
  19
  20#define alloc_zeroed_user_highpage_movable(vma, vaddr) \
  21        alloc_page_vma(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, vma, vmaddr)
  22#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE_MOVABLE
  23
  24extern void copy_page(void * _to, void * _from);
  25#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  26
  27#ifdef STRICT_MM_TYPECHECKS
  28/*
  29 * These are used to make use of C type-checking..
  30 */
  31typedef struct { unsigned long pte; } pte_t;
  32typedef struct { unsigned long pmd; } pmd_t;
  33typedef struct { unsigned long pgd; } pgd_t;
  34typedef struct { unsigned long pgprot; } pgprot_t;
  35
  36#define pte_val(x)      ((x).pte)
  37#define pmd_val(x)      ((x).pmd)
  38#define pgd_val(x)      ((x).pgd)
  39#define pgprot_val(x)   ((x).pgprot)
  40
  41#define __pte(x)        ((pte_t) { (x) } )
  42#define __pmd(x)        ((pmd_t) { (x) } )
  43#define __pgd(x)        ((pgd_t) { (x) } )
  44#define __pgprot(x)     ((pgprot_t) { (x) } )
  45
  46#else
  47/*
  48 * .. while these make it easier on the compiler
  49 */
  50typedef unsigned long pte_t;
  51typedef unsigned long pmd_t;
  52typedef unsigned long pgd_t;
  53typedef unsigned long pgprot_t;
  54
  55#define pte_val(x)      (x)
  56#define pmd_val(x)      (x)
  57#define pgd_val(x)      (x)
  58#define pgprot_val(x)   (x)
  59
  60#define __pte(x)        (x)
  61#define __pgd(x)        (x)
  62#define __pgprot(x)     (x)
  63
  64#endif /* STRICT_MM_TYPECHECKS */
  65
  66typedef struct page *pgtable_t;
  67
  68#ifdef USE_48_BIT_KSEG
  69#define PAGE_OFFSET             0xffff800000000000UL
  70#else
  71#define PAGE_OFFSET             0xfffffc0000000000UL
  72#endif
  73
  74#else
  75
  76#ifdef USE_48_BIT_KSEG
  77#define PAGE_OFFSET             0xffff800000000000
  78#else
  79#define PAGE_OFFSET             0xfffffc0000000000
  80#endif
  81
  82#endif /* !__ASSEMBLY__ */
  83
  84#define __pa(x)                 ((unsigned long) (x) - PAGE_OFFSET)
  85#define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
  86
  87#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  88#define virt_addr_valid(kaddr)  pfn_valid((__pa(kaddr) >> PAGE_SHIFT))
  89
  90#ifdef CONFIG_FLATMEM
  91#define pfn_valid(pfn)          ((pfn) < max_mapnr)
  92#endif /* CONFIG_FLATMEM */
  93
  94#include <asm-generic/memory_model.h>
  95#include <asm-generic/getorder.h>
  96
  97#endif /* _ALPHA_PAGE_H */
  98