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