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

INCLUDED FROM

DEFINITIONS

1. pmd_populate_kernel
2. pmd_populate
3. pte_alloc_one_kernel
4. pgd_free
5. pgd_alloc

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3 
   4 #ifndef __ASM_CSKY_PGALLOC_H
   5 #define __ASM_CSKY_PGALLOC_H
   6 
   7 #include <linux/highmem.h>
   8 #include <linux/mm.h>
   9 #include <linux/sched.h>
  10 
  11 #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
  12 #include <asm-generic/pgalloc.h>        /* for pte_{alloc,free}_one */
  13 
  14 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  15                                         pte_t *pte)
  16 {
  17         set_pmd(pmd, __pmd(__pa(pte)));
  18 }
  19 
  20 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  21                                         pgtable_t pte)
  22 {
  23         set_pmd(pmd, __pmd(__pa(page_address(pte))));
  24 }
  25 
  26 #define pmd_pgtable(pmd) pmd_page(pmd)
  27 
  28 extern void pgd_init(unsigned long *p);
  29 
  30 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
  31 {
  32         pte_t *pte;
  33         unsigned long i;
  34 
  35         pte = (pte_t *) __get_free_page(GFP_KERNEL);
  36         if (!pte)
  37                 return NULL;
  38 
  39         for (i = 0; i < PAGE_SIZE/sizeof(pte_t); i++)
  40                 (pte + i)->pte_low = _PAGE_GLOBAL;
  41 
  42         return pte;
  43 }
  44 
  45 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  46 {
  47         free_pages((unsigned long)pgd, PGD_ORDER);
  48 }
  49 
  50 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  51 {
  52         pgd_t *ret;
  53         pgd_t *init;
  54 
  55         ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
  56         if (ret) {
  57                 init = pgd_offset(&init_mm, 0UL);
  58                 pgd_init((unsigned long *)ret);
  59                 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
  60                         (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  61                 /* prevent out of order excute */
  62                 smp_mb();
  63 #ifdef CONFIG_CPU_NEED_TLBSYNC
  64                 dcache_wb_range((unsigned int)ret,
  65                                 (unsigned int)(ret + PTRS_PER_PGD));
  66 #endif
  67         }
  68 
  69         return ret;
  70 }
  71 
  72 #define __pte_free_tlb(tlb, pte, address)               \
  73 do {                                                    \
  74         pgtable_pte_page_dtor(pte);                     \
  75         tlb_remove_page(tlb, pte);                      \
  76 } while (0)
  77 
  78 extern void pagetable_init(void);
  79 extern void pre_mmu_init(void);
  80 extern void pre_trap_init(void);
  81 
  82 #endif /* __ASM_CSKY_PGALLOC_H */