80 lines
1.6 KiB
C
80 lines
1.6 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(struct page *page)
|
||
|
|
{
|
||
|
|
unsigned long vaddr;
|
||
|
|
might_sleep();
|
||
|
|
if (!PageHighMem(page))
|
||
|
|
return page_address(page);
|
||
|
|
vaddr = (unsigned long)kmap_high(page);
|
||
|
|
return (void *)vaddr;
|
||
|
|
}
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(kmap);
|
||
|
|
|
||
|
|
void kunmap(struct page *page)
|
||
|
|
{
|
||
|
|
BUG_ON(in_interrupt());
|
||
|
|
if (!PageHighMem(page))
|
||
|
|
return;
|
||
|
|
kunmap_high(page);
|
||
|
|
}
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(kunmap);
|
||
|
|
|
||
|
|
void *kmap_atomic(struct page *page)
|
||
|
|
{
|
||
|
|
unsigned int idx;
|
||
|
|
unsigned long vaddr, pte;
|
||
|
|
int type;
|
||
|
|
pte_t *ptep;
|
||
|
|
|
||
|
|
preempt_disable();
|
||
|
|
pagefault_disable();
|
||
|
|
if (!PageHighMem(page))
|
||
|
|
return page_address(page);
|
||
|
|
|
||
|
|
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) | (PAGE_KERNEL);
|
||
|
|
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);
|
||
|
|
|
||
|
|
void __kunmap_atomic(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);
|
||
|
|
}
|
||
|
|
pagefault_enable();
|
||
|
|
preempt_enable();
|
||
|
|
}
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(__kunmap_atomic);
|