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
  12 unsigned long highstart_pfn, highend_pfn;
  13
  14 void kmap_flush_tlb(unsigned long addr)
  15 {
  16         flush_tlb_one(addr);
  17 }
  18 EXPORT_SYMBOL(kmap_flush_tlb);
  19
  20 void __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 }