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, unsigned long addr, void *data)
19 struct page_change_data *cdata = data;
22 pte = clear_pte_bit(pte, cdata->clear_mask);
23 pte = set_pte_bit(pte, cdata->set_mask);
25 set_pte_ext(ptep, pte, 0);
29 static bool in_range(unsigned long start, unsigned long size,
30 unsigned long range_start, unsigned long range_end)
32 return start >= range_start && start < range_end &&
33 size <= range_end - start;
36 static int change_memory_common(unsigned long addr, int numpages,
37 pgprot_t set_mask, pgprot_t clear_mask)
39 unsigned long start = addr & PAGE_MASK;
40 unsigned long end = PAGE_ALIGN(addr) + numpages * PAGE_SIZE;
41 unsigned long size = end - start;
43 struct page_change_data data;
45 WARN_ON_ONCE(start != addr);
50 if (!in_range(start, size, MODULES_VADDR, MODULES_END) &&
51 !in_range(start, size, VMALLOC_START, VMALLOC_END))
54 data.set_mask = set_mask;
55 data.clear_mask = clear_mask;
57 ret = apply_to_page_range(&init_mm, start, size, change_page_range,
60 flush_tlb_kernel_range(start, end);
64 int set_memory_ro(unsigned long addr, int numpages)
66 return change_memory_common(addr, numpages,
67 __pgprot(L_PTE_RDONLY),
71 int set_memory_rw(unsigned long addr, int numpages)
73 return change_memory_common(addr, numpages,
75 __pgprot(L_PTE_RDONLY));
78 int set_memory_nx(unsigned long addr, int numpages)
80 return change_memory_common(addr, numpages,
85 int set_memory_x(unsigned long addr, int numpages)
87 return change_memory_common(addr, numpages,