LXR linux/arch/csky/mm/highmem.c

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4#include <linux/module.h>
   5#include <linux/highmem.h>
   6#include <linux/smp.h>
   7#include <linux/memblock.h>
   8#include <asm/fixmap.h>
   9#include <asm/tlbflush.h>
  10#include <asm/cacheflush.h>
  11
  12unsigned long highstart_pfn, highend_pfn;
  13
  14void kmap_flush_tlb(unsigned long addr)
  15{
  16        flush_tlb_one(addr);
  17}
  18EXPORT_SYMBOL(kmap_flush_tlb);
  19
  20void __init kmap_init(void)
  21{
  22        unsigned long vaddr;
  23        pgd_t *pgd;
  24        pmd_t *pmd;
  25        pud_t *pud;
  26        pte_t *pte;
  27
  28        vaddr = PKMAP_BASE;
  29        fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir);
  30
  31        pgd = swapper_pg_dir + pgd_index(vaddr);
  32        pud = (pud_t *)pgd;
  33        pmd = pmd_offset(pud, vaddr);
  34        pte = pte_offset_kernel(pmd, vaddr);
  35        pkmap_page_table = pte;
  36}
  37