mirror of https://gitee.com/openkylin/linux.git
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2005-2017 Andes Technology Corporation
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/memblock.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
|
|
{
|
|
unsigned int idx;
|
|
unsigned long vaddr, pte;
|
|
int type;
|
|
pte_t *ptep;
|
|
|
|
type = kmap_atomic_idx_push();
|
|
|
|
idx = type + KM_TYPE_NR * smp_processor_id();
|
|
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
|
|
pte = (page_to_pfn(page) << PAGE_SHIFT) | prot;
|
|
ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
|
|
set_pte(ptep, pte);
|
|
|
|
__nds32__tlbop_inv(vaddr);
|
|
__nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN);
|
|
__nds32__tlbop_rwr(pte);
|
|
__nds32__isb();
|
|
return (void *)vaddr;
|
|
}
|
|
EXPORT_SYMBOL(kmap_atomic_high_prot);
|
|
|
|
void kunmap_atomic_high(void *kvaddr)
|
|
{
|
|
if (kvaddr >= (void *)FIXADDR_START) {
|
|
unsigned long vaddr = (unsigned long)kvaddr;
|
|
pte_t *ptep;
|
|
kmap_atomic_idx_pop();
|
|
__nds32__tlbop_inv(vaddr);
|
|
__nds32__isb();
|
|
ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
|
|
set_pte(ptep, 0);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(kunmap_atomic_high);
|