arm64/mm/ioremap.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002
0003 #include <linux/mm.h>
0004 #include <linux/io.h>
0005
0006 bool ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned long prot)
0007 {
0008     unsigned long last_addr = phys_addr + size - 1;
0009
0010     /* Don't allow outside PHYS_MASK */
0011     if (last_addr & ~PHYS_MASK)
0012         return false;
0013
0014     /* Don't allow RAM to be mapped. */
0015     if (WARN_ON(pfn_is_map_memory(__phys_to_pfn(phys_addr))))
0016         return false;
0017
0018     return true;
0019 }
0020
0021 /*
0022  * Must be called after early_fixmap_init
0023  */
0024 void __init early_ioremap_init(void)
0025 {
0026     early_ioremap_setup();
0027 }
0028
0029 bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size,
0030                  unsigned long flags)
0031 {
0032     unsigned long pfn = PHYS_PFN(offset);
0033
0034     return pfn_is_map_memory(pfn);
0035 }