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 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  12                                         pte_t *pte)
  13 {
  14         set_pmd(pmd, __pmd(__pa(pte)));
  15 }
  16
  17 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  18                                         pgtable_t pte)
  19 {
  20         set_pmd(pmd, __pmd(__pa(page_address(pte))));
  21 }
  22
  23 #define pmd_pgtable(pmd) pmd_page(pmd)
  24
  25 extern void pgd_init(unsigned long *p);
  26
  27 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  28                                         unsigned long address)
  29 {
  30         pte_t *pte;
  31         unsigned long *kaddr, i;
  32
  33         pte = (pte_t *) __get_free_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL,
  34                                          PTE_ORDER);
  35         kaddr = (unsigned long *)pte;
  36         if (address & 0x80000000)
  37                 for (i = 0; i < (PAGE_SIZE/4); i++)
  38                         *(kaddr + i) = 0x1;
  39         else
  40                 clear_page(kaddr);
  41
  42         return pte;
  43 }
  44
  45 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  46                                                 unsigned long address)
  47 {
  48         struct page *pte;
  49         unsigned long *kaddr, i;
  50
  51         pte = alloc_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL, PTE_ORDER);
  52         if (pte) {
  53                 kaddr = kmap_atomic(pte);
  54                 if (address & 0x80000000) {
  55                         for (i = 0; i < (PAGE_SIZE/4); i++)
  56                                 *(kaddr + i) = 0x1;
  57                 } else
  58                         clear_page(kaddr);
  59                 kunmap_atomic(kaddr);
  60                 pgtable_page_ctor(pte);
  61         }
  62         return pte;
  63 }
  64
  65 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  66 {
  67         free_pages((unsigned long)pte, PTE_ORDER);
  68 }
  69
  70 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  71 {
  72         pgtable_page_dtor(pte);
  73         __free_pages(pte, PTE_ORDER);
  74 }
  75
  76 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  77 {
  78         free_pages((unsigned long)pgd, PGD_ORDER);
  79 }
  80
  81 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  82 {
  83         pgd_t *ret;
  84         pgd_t *init;
  85
  86         ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
  87         if (ret) {
  88                 init = pgd_offset(&init_mm, 0UL);
  89                 pgd_init((unsigned long *)ret);
  90                 memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
  91                         (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  92                 /* prevent out of order excute */
  93                 smp_mb();
  94 #ifdef CONFIG_CPU_NEED_TLBSYNC
  95                 dcache_wb_range((unsigned int)ret,
  96                                 (unsigned int)(ret + PTRS_PER_PGD));
  97 #endif
  98         }
  99
 100         return ret;
 101 }
 102
 103 #define __pte_free_tlb(tlb, pte, address)               \
 104 do {                                                    \
 105         pgtable_page_dtor(pte);                         \
 106         tlb_remove_page(tlb, pte);                      \
 107 } while (0)
 108
 109 #define check_pgt_cache()       do {} while (0)
 110
 111 extern void pagetable_init(void);
 112 extern void pre_mmu_init(void);
 113 extern void pre_trap_init(void);
 114
 115 #endif /* __ASM_CSKY_PGALLOC_H */