root/arch/x86/include/asm/pgtable-3level_types.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_PGTABLE_3LEVEL_DEFS_H
   3 #define _ASM_X86_PGTABLE_3LEVEL_DEFS_H
   4 
   5 #ifndef __ASSEMBLY__
   6 #include <linux/types.h>
   7 
   8 typedef u64     pteval_t;
   9 typedef u64     pmdval_t;
  10 typedef u64     pudval_t;
  11 typedef u64     p4dval_t;
  12 typedef u64     pgdval_t;
  13 typedef u64     pgprotval_t;
  14 
  15 typedef union {
  16         struct {
  17                 unsigned long pte_low, pte_high;
  18         };
  19         pteval_t pte;
  20 } pte_t;
  21 #endif  /* !__ASSEMBLY__ */
  22 
  23 #ifdef CONFIG_PARAVIRT_XXL
  24 #define SHARED_KERNEL_PMD       ((!static_cpu_has(X86_FEATURE_PTI) &&   \
  25                                  (pv_info.shared_kernel_pmd)))
  26 #else
  27 #define SHARED_KERNEL_PMD       (!static_cpu_has(X86_FEATURE_PTI))
  28 #endif
  29 
  30 /*
  31  * PGDIR_SHIFT determines what a top-level page table entry can map
  32  */
  33 #define PGDIR_SHIFT     30
  34 #define PTRS_PER_PGD    4
  35 
  36 /*
  37  * PMD_SHIFT determines the size of the area a middle-level
  38  * page table can map
  39  */
  40 #define PMD_SHIFT       21
  41 #define PTRS_PER_PMD    512
  42 
  43 /*
  44  * entries per page directory level
  45  */
  46 #define PTRS_PER_PTE    512
  47 
  48 #define MAX_POSSIBLE_PHYSMEM_BITS       36
  49 #define PGD_KERNEL_START        (CONFIG_PAGE_OFFSET >> PGDIR_SHIFT)
  50 
  51 #endif /* _ASM_X86_PGTABLE_3LEVEL_DEFS_H */