root/arch/nds32/include/asm/pgalloc.h

INCLUDED FROM

DEFINITIONS

1. pte_alloc_one
2. pmd_populate_kernel
3. pmd_populate

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 // Copyright (C) 2005-2017 Andes Technology Corporation
   3 
   4 #ifndef _ASMNDS32_PGALLOC_H
   5 #define _ASMNDS32_PGALLOC_H
   6 
   7 #include <asm/processor.h>
   8 #include <asm/cacheflush.h>
   9 #include <asm/tlbflush.h>
  10 #include <asm/proc-fns.h>
  11 
  12 #define __HAVE_ARCH_PTE_ALLOC_ONE
  13 #include <asm-generic/pgalloc.h>        /* for pte_{alloc,free}_one */
  14 
  15 /*
  16  * Since we have only two-level page tables, these are trivial
  17  */
  18 #define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *)2); })
  19 #define pmd_free(mm, pmd)                       do { } while (0)
  20 #define pgd_populate(mm, pmd, pte)      BUG()
  21 #define pmd_pgtable(pmd) pmd_page(pmd)
  22 
  23 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  24 extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
  25 
  26 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
  27 {
  28         pgtable_t pte;
  29 
  30         pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
  31         if (pte)
  32                 cpu_dcache_wb_page((unsigned long)page_address(pte));
  33 
  34         return pte;
  35 }
  36 
  37 /*
  38  * Populate the pmdp entry with a pointer to the pte.  This pmd is part
  39  * of the mm address space.
  40  *
  41  * Ensure that we always set both PMD entries.
  42  */
  43 static inline void
  44 pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep)
  45 {
  46         unsigned long pte_ptr = (unsigned long)ptep;
  47         unsigned long pmdval;
  48 
  49         BUG_ON(mm != &init_mm);
  50 
  51         /*
  52          * The pmd must be loaded with the physical
  53          * address of the PTE table
  54          */
  55         pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
  56         set_pmd(pmdp, __pmd(pmdval));
  57 }
  58 
  59 static inline void
  60 pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep)
  61 {
  62         unsigned long pmdval;
  63 
  64         BUG_ON(mm == &init_mm);
  65 
  66         pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
  67         set_pmd(pmdp, __pmd(pmdval));
  68 }
  69 
  70 #endif