blob: 6cc0b7e7eb0384b991dd59ce18ea2a476cb20958 (
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
|
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/mm.h>
#include <linux/io.h>
static ioremap_prot_hook_t ioremap_prot_hook;
int arm64_ioremap_prot_hook_register(ioremap_prot_hook_t hook)
{
if (WARN_ON(ioremap_prot_hook))
return -EBUSY;
ioremap_prot_hook = hook;
return 0;
}
void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
unsigned long prot)
{
unsigned long last_addr = phys_addr + size - 1;
pgprot_t pgprot = __pgprot(prot);
/* Don't allow outside PHYS_MASK */
if (last_addr & ~PHYS_MASK)
return NULL;
/* Don't allow RAM to be mapped. */
if (WARN_ON(pfn_is_map_memory(__phys_to_pfn(phys_addr))))
return NULL;
/*
* If a hook is registered (e.g. for confidential computing
* purposes), call that now and barf if it fails.
*/
if (unlikely(ioremap_prot_hook) &&
WARN_ON(ioremap_prot_hook(phys_addr, size, &pgprot))) {
return NULL;
}
return generic_ioremap_prot(phys_addr, size, pgprot);
}
EXPORT_SYMBOL(ioremap_prot);
/*
* Must be called after early_fixmap_init
*/
void __init early_ioremap_init(void)
{
early_ioremap_setup();
}
bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size,
unsigned long flags)
{
unsigned long pfn = PHYS_PFN(offset);
return pfn_is_map_memory(pfn);
}
|
