LXR linux/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
  13static 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
  19static 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
  25extern void pgd_init(unsigned long *p);
  26
  27static 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
  42static 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_pages(GFP_KERNEL, PGD_ORDER);
  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)               \
  65do {                                                    \
  66        pgtable_pte_page_dtor(pte);                     \
  67        tlb_remove_page(tlb, pte);                      \
  68} while (0)
  69
  70extern void pagetable_init(void);
  71extern void mmu_init(unsigned long min_pfn, unsigned long max_pfn);
  72extern void pre_trap_init(void);
  73
  74#endif /* __ASM_CSKY_PGALLOC_H */
  75