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,