1 // SPDX-License-Identifier: GPL-2.0
6 #define pr_fmt(fmt)	"efi: memattr: " fmt
8 #include <linux/efi.h>
31 		pr_err("Failed to map EFI Memory Attributes table @ 0x%lx\n",  in efi_memattr_init()
33 		return -ENOMEM;  in efi_memattr_init()
36 	if (tbl->version > 2) {  in efi_memattr_init()
37 		pr_warn("Unexpected EFI Memory Attributes table version %d\n",  in efi_memattr_init()
38 			tbl->version);  in efi_memattr_init()
42 	tbl_size = sizeof(*tbl) + tbl->num_entries * tbl->desc_size;  in efi_memattr_init()
44 	set_bit(EFI_MEM_ATTR, &efi.flags);  in efi_memattr_init()
58 	u64 in_paddr = in->phys_addr;  in entry_is_valid()
59 	u64 in_size = in->num_pages << EFI_PAGE_SHIFT;  in entry_is_valid()
64 	if (in->type != EFI_RUNTIME_SERVICES_CODE &&  in entry_is_valid()
65 	    in->type != EFI_RUNTIME_SERVICES_DATA) {  in entry_is_valid()
71 	    (!PAGE_ALIGNED(in->phys_addr) ||  in entry_is_valid()
72 	     !PAGE_ALIGNED(in->num_pages << EFI_PAGE_SHIFT))) {  in entry_is_valid()
74 		 * Since arm64 may execute with page sizes of up to 64 KB, the  in entry_is_valid()
85 		u64 md_paddr = md->phys_addr;  in entry_is_valid()
86 		u64 md_size = md->num_pages << EFI_PAGE_SHIFT;  in entry_is_valid()
88 		if (!(md->attribute & EFI_MEMORY_RUNTIME))  in entry_is_valid()
90 		if (md->virt_addr == 0 && md->phys_addr != 0) {  in entry_is_valid()
95 		if (md_paddr > in_paddr || (in_paddr - md_paddr) >= md_size)  in entry_is_valid()
103 			pr_warn("Entry covers multiple EFI memory map regions\n");  in entry_is_valid()
107 		if (md->type != in->type) {  in entry_is_valid()
108 			pr_warn("Entry type deviates from EFI memory map region type\n");  in entry_is_valid()
112 		out->virt_addr = in_paddr + (md->virt_addr - md_paddr);  in entry_is_valid()
117 	pr_warn("No matching entry found in the EFI memory map\n");  in entry_is_valid()
122  * To be called after the EFI page tables have been populated. If a memory
139 	 * We need the EFI memory map to be setup so we can use it to  in efi_memattr_apply_permissions()
140 	 * lookup the virtual addresses of all entries in the  of EFI  in efi_memattr_apply_permissions()
149 		pr_err("Failed to map EFI Memory Attributes table @ 0x%lx\n",  in efi_memattr_apply_permissions()
151 		return -ENOMEM;  in efi_memattr_apply_permissions()
154 	if (tbl->version > 1 &&  in efi_memattr_apply_permissions()
155 	    (tbl->flags & EFI_MEMORY_ATTRIBUTES_FLAGS_RT_FORWARD_CONTROL_FLOW_GUARD))  in efi_memattr_apply_permissions()
159 		pr_info("Processing EFI Memory Attributes table:\n");  in efi_memattr_apply_permissions()
161 	for (i = ret = 0; ret == 0 && i < tbl->num_entries; i++) {  in efi_memattr_apply_permissions()
167 		valid = entry_is_valid((void *)tbl->entry + i * tbl->desc_size,  in efi_memattr_apply_permissions()
171 			pr_info("%s 0x%012llx-0x%012llx %s\n",  in efi_memattr_apply_permissions()
173 				md.phys_addr + size - 1,  in efi_memattr_apply_permissions()