root/arch/x86/include/asm/page_types.h

INCLUDED FROM

DEFINITIONS

1. get_max_mapped

   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 \
  39         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
  40          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  41 
  42 #define __PHYSICAL_START        ALIGN(CONFIG_PHYSICAL_START, \
  43                                       CONFIG_PHYSICAL_ALIGN)
  44 
  45 #define __START_KERNEL          (__START_KERNEL_map + __PHYSICAL_START)
  46 
  47 #ifdef CONFIG_X86_64
  48 #include <asm/page_64_types.h>
  49 #define IOREMAP_MAX_ORDER       (PUD_SHIFT)
  50 #else
  51 #include <asm/page_32_types.h>
  52 #define IOREMAP_MAX_ORDER       (PMD_SHIFT)
  53 #endif  /* CONFIG_X86_64 */
  54 
  55 #ifndef __ASSEMBLY__
  56 
  57 #ifdef CONFIG_DYNAMIC_PHYSICAL_MASK
  58 extern phys_addr_t physical_mask;
  59 #define __PHYSICAL_MASK         physical_mask
  60 #else
  61 #define __PHYSICAL_MASK         ((phys_addr_t)((1ULL << __PHYSICAL_MASK_SHIFT) - 1))
  62 #endif
  63 
  64 extern int devmem_is_allowed(unsigned long pagenr);
  65 
  66 extern unsigned long max_low_pfn_mapped;
  67 extern unsigned long max_pfn_mapped;
  68 
  69 static inline phys_addr_t get_max_mapped(void)
  70 {
  71         return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT;
  72 }
  73 
  74 bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn);
  75 
  76 extern unsigned long init_memory_mapping(unsigned long start,
  77                                          unsigned long end);
  78 
  79 extern void initmem_init(void);
  80 
  81 #endif  /* !__ASSEMBLY__ */
  82 
  83 #endif  /* _ASM_X86_PAGE_DEFS_H */