arch/csky/include/asm/pgalloc.h

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