Contributors: 8
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jungseung Lee |
318 |
66.11% |
1 |
9.09% |
| Russell King |
83 |
17.26% |
3 |
27.27% |
| Kefeng Wang |
60 |
12.47% |
1 |
9.09% |
| Mika Penttilä |
7 |
1.46% |
1 |
9.09% |
| Laura Abbott |
5 |
1.04% |
2 |
18.18% |
| Jeremy Kerr |
3 |
0.62% |
1 |
9.09% |
| Matthew Wilcox |
3 |
0.62% |
1 |
9.09% |
| Thomas Gleixner |
2 |
0.42% |
1 |
9.09% |
| Total |
481 |
|
11 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014, The Linux Foundation. All rights reserved.
*/
#include <linux/mm.h>
#include <linux/module.h>
#include <asm/tlbflush.h>
#include <asm/set_memory.h>
struct page_change_data {
pgprot_t set_mask;
pgprot_t clear_mask;
};
static int change_page_range(pte_t *ptep, unsigned long addr, void *data)
{
struct page_change_data *cdata = data;
pte_t pte = *ptep;
pte = clear_pte_bit(pte, cdata->clear_mask);
pte = set_pte_bit(pte, cdata->set_mask);
set_pte_ext(ptep, pte, 0);
return 0;
}
static bool range_in_range(unsigned long start, unsigned long size,
unsigned long range_start, unsigned long range_end)
{
return start >= range_start && start < range_end &&
size <= range_end - start;
}
/*
* This function assumes that the range is mapped with PAGE_SIZE pages.
*/
static int __change_memory_common(unsigned long start, unsigned long size,
pgprot_t set_mask, pgprot_t clear_mask)
{
struct page_change_data data;
int ret;
data.set_mask = set_mask;
data.clear_mask = clear_mask;
ret = apply_to_page_range(&init_mm, start, size, change_page_range,
&data);
flush_tlb_kernel_range(start, start + size);
return ret;
}
static int change_memory_common(unsigned long addr, int numpages,
pgprot_t set_mask, pgprot_t clear_mask)
{
unsigned long start = addr & PAGE_MASK;
unsigned long end = PAGE_ALIGN(addr) + numpages * PAGE_SIZE;
unsigned long size = end - start;
WARN_ON_ONCE(start != addr);
if (!size)
return 0;
if (!range_in_range(start, size, MODULES_VADDR, MODULES_END) &&
!range_in_range(start, size, VMALLOC_START, VMALLOC_END))
return -EINVAL;
return __change_memory_common(start, size, set_mask, clear_mask);
}
int set_memory_ro(unsigned long addr, int numpages)
{
return change_memory_common(addr, numpages,
__pgprot(L_PTE_RDONLY),
__pgprot(0));
}
int set_memory_rw(unsigned long addr, int numpages)
{
return change_memory_common(addr, numpages,
__pgprot(0),
__pgprot(L_PTE_RDONLY));
}
int set_memory_nx(unsigned long addr, int numpages)
{
return change_memory_common(addr, numpages,
__pgprot(L_PTE_XN),
__pgprot(0));
}
int set_memory_x(unsigned long addr, int numpages)
{
return change_memory_common(addr, numpages,
__pgprot(0),
__pgprot(L_PTE_XN));
}
int set_memory_valid(unsigned long addr, int numpages, int enable)
{
if (enable)
return __change_memory_common(addr, PAGE_SIZE * numpages,
__pgprot(L_PTE_VALID),
__pgprot(0));
else
return __change_memory_common(addr, PAGE_SIZE * numpages,
__pgprot(0),
__pgprot(L_PTE_VALID));
}