1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <linux/mm.h>
4#include <linux/io.h>
5
6void __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}
21EXPORT_SYMBOL(ioremap_prot);
22
23/*
24 * Must be called after early_fixmap_init
25 */
26void __init early_ioremap_init(void)
27{
28	early_ioremap_setup();
29}
30
31bool 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