| 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 |