Contributors: 11
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Ralf Baechle |
271 |
77.65% |
6 |
30.00% |
| Peter Zijlstra |
42 |
12.03% |
3 |
15.00% |
| Ira Weiny |
13 |
3.72% |
3 |
15.00% |
| David S. Miller |
5 |
1.43% |
1 |
5.00% |
| Paul Gortmaker |
4 |
1.15% |
1 |
5.00% |
| Akinobu Mita |
4 |
1.15% |
1 |
5.00% |
| David Hildenbrand |
3 |
0.86% |
1 |
5.00% |
| Yoichi Yuasa |
3 |
0.86% |
1 |
5.00% |
| Andrew Morton |
2 |
0.57% |
1 |
5.00% |
| Mike Rapoport |
1 |
0.29% |
1 |
5.00% |
| Greg Kroah-Hartman |
1 |
0.29% |
1 |
5.00% |
| Total |
349 |
|
20 |
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/highmem.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <asm/fixmap.h>
#include <asm/tlbflush.h>
static pte_t *kmap_pte;
unsigned long highstart_pfn, highend_pfn;
void kmap_flush_tlb(unsigned long addr)
{
flush_tlb_one(addr);
}
EXPORT_SYMBOL(kmap_flush_tlb);
void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned long vaddr;
int idx, type;
type = kmap_atomic_idx_push();
idx = type + KM_TYPE_NR*smp_processor_id();
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(*(kmap_pte - idx)));
#endif
set_pte(kmap_pte-idx, mk_pte(page, prot));
local_flush_tlb_one((unsigned long)vaddr);
return (void*) vaddr;
}
EXPORT_SYMBOL(kmap_atomic_high_prot);
void kunmap_atomic_high(void *kvaddr)
{
unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
int type __maybe_unused;
if (vaddr < FIXADDR_START)
return;
type = kmap_atomic_idx();
#ifdef CONFIG_DEBUG_HIGHMEM
{
int idx = type + KM_TYPE_NR * smp_processor_id();
BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
/*
* force other mappings to Oops if they'll try to access
* this pte without first remap it
*/
pte_clear(&init_mm, vaddr, kmap_pte-idx);
local_flush_tlb_one(vaddr);
}
#endif
kmap_atomic_idx_pop();
}
EXPORT_SYMBOL(kunmap_atomic_high);
/*
* This is the same as kmap_atomic() but can map memory that doesn't
* have a struct page associated with it.
*/
void *kmap_atomic_pfn(unsigned long pfn)
{
unsigned long vaddr;
int idx, type;
preempt_disable();
pagefault_disable();
type = kmap_atomic_idx_push();
idx = type + KM_TYPE_NR*smp_processor_id();
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
set_pte(kmap_pte-idx, pfn_pte(pfn, PAGE_KERNEL));
flush_tlb_one(vaddr);
return (void*) vaddr;
}
void __init kmap_init(void)
{
unsigned long kmap_vstart;
/* cache the first kmap pte */
kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
kmap_pte = virt_to_kpte(kmap_vstart);
}