arch/csky/include/asm/pgalloc.h

   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>
  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 pgd_t *pgd_alloc(struct mm_struct *mm)
  46 {
  47         pgd_t *ret;
  48         pgd_t *init;
  49
  50         ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
  51         if (ret) {
  52                 init = pgd_offset(&init_mm, 0UL);
  53                 pgd_init((unsigned long *)ret);
  54                 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
  55                         (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  56                 /* prevent out of order excute */
  57                 smp_mb();
  58 #ifdef CONFIG_CPU_NEED_TLBSYNC
  59                 dcache_wb_range((unsigned int)ret,
  60                                 (unsigned int)(ret + PTRS_PER_PGD));
  61 #endif
  62         }
  63
  64         return ret;
  65 }
  66
  67 #define __pte_free_tlb(tlb, pte, address)               \
  68 do {                                                    \
  69         pgtable_pte_page_dtor(pte);                     \
  70         tlb_remove_page(tlb, pte);                      \
  71 } while (0)
  72
  73 extern void pagetable_init(void);
  74 extern void pre_mmu_init(void);
  75 extern void pre_trap_init(void);
  76
  77 #endif /* __ASM_CSKY_PGALLOC_H */