LXR linux/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
  14static 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
  20static 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
  28extern void pgd_init(unsigned long *p);
  29
  30static 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
  45static 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)               \
  68do {                                                    \
  69        pgtable_pte_page_dtor(pte);                     \
  70        tlb_remove_page(tlb, pte);                      \
  71} while (0)
  72
  73extern void pagetable_init(void);
  74extern void pre_mmu_init(void);
  75extern void pre_trap_init(void);
  76
  77#endif /* __ASM_CSKY_PGALLOC_H */
  78