LXR linux/arch/parisc/mm/fixmap.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * fixmaps for parisc
   4 *
   5 * Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
   6 */
   7
   8#include <linux/kprobes.h>
   9#include <linux/mm.h>
  10#include <asm/cacheflush.h>
  11#include <asm/fixmap.h>
  12
  13void set_fixmap(enum fixed_addresses idx, phys_addr_t phys)
  14{
  15        unsigned long vaddr = __fix_to_virt(idx);
  16        pgd_t *pgd = pgd_offset_k(vaddr);
  17        pmd_t *pmd = pmd_offset(pgd, vaddr);
  18        pte_t *pte;
  19
  20        if (pmd_none(*pmd))
  21                pmd = pmd_alloc(NULL, pgd, vaddr);
  22
  23        pte = pte_offset_kernel(pmd, vaddr);
  24        if (pte_none(*pte))
  25                pte = pte_alloc_kernel(pmd, vaddr);
  26
  27        set_pte_at(&init_mm, vaddr, pte, __mk_pte(phys, PAGE_KERNEL_RWX));
  28        flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
  29}
  30
  31void clear_fixmap(enum fixed_addresses idx)
  32{
  33        unsigned long vaddr = __fix_to_virt(idx);
  34        pgd_t *pgd = pgd_offset_k(vaddr);
  35        pmd_t *pmd = pmd_offset(pgd, vaddr);
  36        pte_t *pte = pte_offset_kernel(pmd, vaddr);
  37
  38        pte_clear(&init_mm, vaddr, pte);
  39
  40        flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
  41}
  42