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