LXR linux/arch/nds32/mm/highmem.c

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (C) 2005-2017 Andes Technology Corporation
   3
   4#include <linux/export.h>
   5#include <linux/highmem.h>
   6#include <linux/sched.h>
   7#include <linux/smp.h>
   8#include <linux/interrupt.h>
   9#include <linux/memblock.h>
  10#include <asm/fixmap.h>
  11#include <asm/tlbflush.h>
  12
  13void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
  14{
  15        unsigned int idx;
  16        unsigned long vaddr, pte;
  17        int type;
  18        pte_t *ptep;
  19
  20        type = kmap_atomic_idx_push();
  21
  22        idx = type + KM_TYPE_NR * smp_processor_id();
  23        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
  24        pte = (page_to_pfn(page) << PAGE_SHIFT) | prot;
  25        ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
  26        set_pte(ptep, pte);
  27
  28        __nds32__tlbop_inv(vaddr);
  29        __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN);
  30        __nds32__tlbop_rwr(pte);
  31        __nds32__isb();
  32        return (void *)vaddr;
  33}
  34EXPORT_SYMBOL(kmap_atomic_high_prot);
  35
  36void kunmap_atomic_high(void *kvaddr)
  37{
  38        if (kvaddr >= (void *)FIXADDR_START) {
  39                unsigned long vaddr = (unsigned long)kvaddr;
  40                pte_t *ptep;
  41                kmap_atomic_idx_pop();
  42                __nds32__tlbop_inv(vaddr);
  43                __nds32__isb();
  44                ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
  45                set_pte(ptep, 0);
  46        }
  47}
  48EXPORT_SYMBOL(kunmap_atomic_high);
  49