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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/arm/mm/pageattr.c
1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
6 #include <linux/module.h>
8 #include <asm/pgtable.h>
9 #include <asm/tlbflush.h>
10 #include <asm/set_memory.h>
12 struct page_change_data
{
17 static int change_page_range(pte_t
*ptep
, pgtable_t token
, unsigned long addr
,
20 struct page_change_data
*cdata
= data
;
23 pte
= clear_pte_bit(pte
, cdata
->clear_mask
);
24 pte
= set_pte_bit(pte
, cdata
->set_mask
);
26 set_pte_ext(ptep
, pte
, 0);
30 static bool in_range(unsigned long start
, unsigned long size
,
31 unsigned long range_start
, unsigned long range_end
)
33 return start
>= range_start
&& start
< range_end
&&
34 size
<= range_end
- start
;
37 static int change_memory_common(unsigned long addr
, int numpages
,
38 pgprot_t set_mask
, pgprot_t clear_mask
)
40 unsigned long start
= addr
& PAGE_MASK
;
41 unsigned long end
= PAGE_ALIGN(addr
) + numpages
* PAGE_SIZE
;
42 unsigned long size
= end
- start
;
44 struct page_change_data data
;
46 WARN_ON_ONCE(start
!= addr
);
51 if (!in_range(start
, size
, MODULES_VADDR
, MODULES_END
) &&
52 !in_range(start
, size
, VMALLOC_START
, VMALLOC_END
))
55 data
.set_mask
= set_mask
;
56 data
.clear_mask
= clear_mask
;
58 ret
= apply_to_page_range(&init_mm
, start
, size
, change_page_range
,
61 flush_tlb_kernel_range(start
, end
);
65 int set_memory_ro(unsigned long addr
, int numpages
)
67 return change_memory_common(addr
, numpages
,
68 __pgprot(L_PTE_RDONLY
),
72 int set_memory_rw(unsigned long addr
, int numpages
)
74 return change_memory_common(addr
, numpages
,
76 __pgprot(L_PTE_RDONLY
));
79 int set_memory_nx(unsigned long addr
, int numpages
)
81 return change_memory_common(addr
, numpages
,
86 int set_memory_x(unsigned long addr
, int numpages
)
88 return change_memory_common(addr
, numpages
,