blob: 92636e82957c7ed58201073c1477c68568421602 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* KFENCE support for LoongArch.
*
* Author: Enze Li <lienze@kylinos.cn>
* Copyright (C) 2022-2023 KylinSoft Corporation.
*/
#ifndef _ASM_LOONGARCH_KFENCE_H
#define _ASM_LOONGARCH_KFENCE_H
#include <linux/kfence.h>
#include <linux/vmalloc.h>
#include <asm/pgtable.h>
#include <asm/tlb.h>
static inline bool arch_kfence_init_pool(void)
{
int err;
char *kaddr, *vaddr;
char *kfence_pool = __kfence_pool;
struct vm_struct *area;
area = __get_vm_area_caller(KFENCE_POOL_SIZE, VM_IOREMAP,
KFENCE_AREA_START, KFENCE_AREA_END,
__builtin_return_address(0));
if (!area)
return false;
__kfence_pool = (char *)area->addr;
err = ioremap_page_range((unsigned long)__kfence_pool,
(unsigned long)__kfence_pool + KFENCE_POOL_SIZE,
virt_to_phys((void *)kfence_pool), PAGE_KERNEL);
if (err) {
free_vm_area(area);
__kfence_pool = kfence_pool;
return false;
}
kaddr = kfence_pool;
vaddr = __kfence_pool;
while (kaddr < kfence_pool + KFENCE_POOL_SIZE) {
set_page_address(virt_to_page(kaddr), vaddr);
kaddr += PAGE_SIZE;
vaddr += PAGE_SIZE;
}
return true;
}
/* Protect the given page and flush TLB. */
static inline bool kfence_protect_page(unsigned long addr, bool protect)
{
pte_t *pte = virt_to_kpte(addr);
if (WARN_ON(!pte) || pte_none(*pte))
return false;
if (protect)
set_pte(pte, __pte(pte_val(*pte) & ~(_PAGE_VALID | _PAGE_PRESENT)));
else
set_pte(pte, __pte(pte_val(*pte) | (_PAGE_VALID | _PAGE_PRESENT)));
preempt_disable();
local_flush_tlb_one(addr);
preempt_enable();
return true;
}
#endif /* _ASM_LOONGARCH_KFENCE_H */
|
