1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/mm.h>
4 #include <linux/io.h>
5
6 void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
7 unsigned long prot)
8 {
9 unsigned long last_addr = phys_addr + size - 1;
10
11 /* Don't allow outside PHYS_MASK */
12 if (last_addr & ~PHYS_MASK)
13 return NULL;
14
15 /* Don't allow RAM to be mapped. */
16 if (WARN_ON(pfn_is_map_memory(__phys_to_pfn(phys_addr))))
17 return NULL;
18
19 return generic_ioremap_prot(phys_addr, size, __pgprot(prot));
20 }
21 EXPORT_SYMBOL(ioremap_prot);
22
23 /*
24 * Must be called after early_fixmap_init
25 */
26 void __init early_ioremap_init(void)
27 {
28 early_ioremap_setup();
29 }
30
31 bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size,
32 unsigned long flags)
33 {
34 unsigned long pfn = PHYS_PFN(offset);
35
36 return pfn_is_map_memory(pfn);
37 }
38
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