linux/arch/x86/include/asm/page_types.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_PAGE_DEFS_H
   3#define _ASM_X86_PAGE_DEFS_H
   4
   5#include <linux/const.h>
   6#include <linux/types.h>
   7#include <linux/mem_encrypt.h>
   8
   9/* PAGE_SHIFT determines the page size */
  10#define PAGE_SHIFT              12
  11#define PAGE_SIZE               (_AC(1,UL) << PAGE_SHIFT)
  12#define PAGE_MASK               (~(PAGE_SIZE-1))
  13
  14#define PMD_PAGE_SIZE           (_AC(1, UL) << PMD_SHIFT)
  15#define PMD_PAGE_MASK           (~(PMD_PAGE_SIZE-1))
  16
  17#define PUD_PAGE_SIZE           (_AC(1, UL) << PUD_SHIFT)
  18#define PUD_PAGE_MASK           (~(PUD_PAGE_SIZE-1))
  19
  20#define __VIRTUAL_MASK          ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
  21
  22/* Cast *PAGE_MASK to a signed type so that it is sign-extended if
  23   virtual addresses are 32-bits but physical addresses are larger
  24   (ie, 32-bit PAE). */
  25#define PHYSICAL_PAGE_MASK      (((signed long)PAGE_MASK) & __PHYSICAL_MASK)
  26#define PHYSICAL_PMD_PAGE_MASK  (((signed long)PMD_PAGE_MASK) & __PHYSICAL_MASK)
  27#define PHYSICAL_PUD_PAGE_MASK  (((signed long)PUD_PAGE_MASK) & __PHYSICAL_MASK)
  28
  29#define HPAGE_SHIFT             PMD_SHIFT
  30#define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
  31#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  32#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  33
  34#define HUGE_MAX_HSTATE 2
  35
  36#define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  37
  38#define VM_DATA_DEFAULT_FLAGS   VM_DATA_FLAGS_TSK_EXEC
  39
  40#define __PHYSICAL_START        ALIGN(CONFIG_PHYSICAL_START, \
  41                                      CONFIG_PHYSICAL_ALIGN)
  42
  43#define __START_KERNEL          (__START_KERNEL_map + __PHYSICAL_START)
  44
  45#ifdef CONFIG_X86_64
  46#include <asm/page_64_types.h>
  47#define IOREMAP_MAX_ORDER       (PUD_SHIFT)
  48#else
  49#include <asm/page_32_types.h>
  50#define IOREMAP_MAX_ORDER       (PMD_SHIFT)
  51#endif  /* CONFIG_X86_64 */
  52
  53#ifndef __ASSEMBLY__
  54
  55#ifdef CONFIG_DYNAMIC_PHYSICAL_MASK
  56extern phys_addr_t physical_mask;
  57#define __PHYSICAL_MASK         physical_mask
  58#else
  59#define __PHYSICAL_MASK         ((phys_addr_t)((1ULL << __PHYSICAL_MASK_SHIFT) - 1))
  60#endif
  61
  62extern int devmem_is_allowed(unsigned long pagenr);
  63
  64extern unsigned long max_low_pfn_mapped;
  65extern unsigned long max_pfn_mapped;
  66
  67static inline phys_addr_t get_max_mapped(void)
  68{
  69        return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT;
  70}
  71
  72bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn);
  73
  74extern void initmem_init(void);
  75
  76#endif  /* !__ASSEMBLY__ */
  77
  78#endif  /* _ASM_X86_PAGE_DEFS_H */
  79
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