1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <linux/mm.h> 4 #include <linux/io.h> 5 6 static ioremap_prot_hook_t ioremap_prot_hook; 7 8 int arm64_ioremap_prot_hook_register(ioremap_prot_hook_t hook) 9 { 10 if (WARN_ON(ioremap_prot_hook)) 11 return -EBUSY; 12 13 ioremap_prot_hook = hook; 14 return 0; 15 } 16 17 void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size, 18 pgprot_t pgprot) 19 { 20 unsigned long last_addr = phys_addr + size - 1; 21 22 /* Don't allow outside PHYS_MASK */ 23 if (last_addr & ~PHYS_MASK) 24 return NULL; 25 26 /* Don't allow RAM to be mapped. */ 27 if (WARN_ON(pfn_is_map_memory(__phys_to_pfn(phys_addr)))) 28 return NULL; 29 30 /* 31 * If a hook is registered (e.g. for confidential computing 32 * purposes), call that now and barf if it fails. 33 */ 34 if (unlikely(ioremap_prot_hook) && 35 WARN_ON(ioremap_prot_hook(phys_addr, size, &pgprot))) { 36 return NULL; 37 } 38 39 return generic_ioremap_prot(phys_addr, size, pgprot); 40 } 41 EXPORT_SYMBOL(ioremap_prot); 42 43 /* 44 * Must be called after early_fixmap_init 45 */ 46 void __init early_ioremap_init(void) 47 { 48 early_ioremap_setup(); 49 } 50 51 bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size, 52 unsigned long flags) 53 { 54 unsigned long pfn = PHYS_PFN(offset); 55 56 return pfn_is_map_memory(pfn); 57 } 58