12e0eb483SAtish Patra // SPDX-License-Identifier: GPL-2.0-only 22e0eb483SAtish Patra /* 32e0eb483SAtish Patra * EFI stub implementation that is shared by arm and arm64 architectures. 42e0eb483SAtish Patra * This should be #included by the EFI stub implementation files. 52e0eb483SAtish Patra * 62e0eb483SAtish Patra * Copyright (C) 2013,2014 Linaro Limited 72e0eb483SAtish Patra * Roy Franz <roy.franz@linaro.org 82e0eb483SAtish Patra * Copyright (C) 2013 Red Hat, Inc. 92e0eb483SAtish Patra * Mark Salter <msalter@redhat.com> 102e0eb483SAtish Patra */ 112e0eb483SAtish Patra 122e0eb483SAtish Patra #include <linux/efi.h> 132e0eb483SAtish Patra #include <linux/libfdt.h> 142e0eb483SAtish Patra #include <asm/efi.h> 152e0eb483SAtish Patra 162e0eb483SAtish Patra #include "efistub.h" 172e0eb483SAtish Patra 182e0eb483SAtish Patra /* 192e0eb483SAtish Patra * This is the base address at which to start allocating virtual memory ranges 202e0eb483SAtish Patra * for UEFI Runtime Services. This is in the low TTBR0 range so that we can use 212e0eb483SAtish Patra * any allocation we choose, and eliminate the risk of a conflict after kexec. 222e0eb483SAtish Patra * The value chosen is the largest non-zero power of 2 suitable for this purpose 232e0eb483SAtish Patra * both on 32-bit and 64-bit ARM CPUs, to maximize the likelihood that it can 242e0eb483SAtish Patra * be mapped efficiently. 252e0eb483SAtish Patra * Since 32-bit ARM could potentially execute with a 1G/3G user/kernel split, 262e0eb483SAtish Patra * map everything below 1 GB. (512 MB is a reasonable upper bound for the 272e0eb483SAtish Patra * entire footprint of the UEFI runtime services memory regions) 282e0eb483SAtish Patra */ 292e0eb483SAtish Patra #define EFI_RT_VIRTUAL_BASE SZ_512M 302e0eb483SAtish Patra #define EFI_RT_VIRTUAL_SIZE SZ_512M 312e0eb483SAtish Patra 322e0eb483SAtish Patra #ifdef CONFIG_ARM64 332e0eb483SAtish Patra # define EFI_RT_VIRTUAL_LIMIT DEFAULT_MAP_WINDOW_64 342e0eb483SAtish Patra #else 352e0eb483SAtish Patra # define EFI_RT_VIRTUAL_LIMIT TASK_SIZE 362e0eb483SAtish Patra #endif 372e0eb483SAtish Patra 382e0eb483SAtish Patra static u64 virtmap_base = EFI_RT_VIRTUAL_BASE; 392e0eb483SAtish Patra static bool __efistub_global flat_va_mapping; 402e0eb483SAtish Patra 412e0eb483SAtish Patra static efi_system_table_t *__efistub_global sys_table; 422e0eb483SAtish Patra 432e0eb483SAtish Patra __pure efi_system_table_t *efi_system_table(void) 442e0eb483SAtish Patra { 452e0eb483SAtish Patra return sys_table; 462e0eb483SAtish Patra } 472e0eb483SAtish Patra 482e0eb483SAtish Patra static struct screen_info *setup_graphics(void) 492e0eb483SAtish Patra { 502e0eb483SAtish Patra efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 512e0eb483SAtish Patra efi_status_t status; 522e0eb483SAtish Patra unsigned long size; 532e0eb483SAtish Patra void **gop_handle = NULL; 542e0eb483SAtish Patra struct screen_info *si = NULL; 552e0eb483SAtish Patra 562e0eb483SAtish Patra size = 0; 572e0eb483SAtish Patra status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 582e0eb483SAtish Patra &gop_proto, NULL, &size, gop_handle); 592e0eb483SAtish Patra if (status == EFI_BUFFER_TOO_SMALL) { 602e0eb483SAtish Patra si = alloc_screen_info(); 612e0eb483SAtish Patra if (!si) 622e0eb483SAtish Patra return NULL; 632e0eb483SAtish Patra efi_setup_gop(si, &gop_proto, size); 642e0eb483SAtish Patra } 652e0eb483SAtish Patra return si; 662e0eb483SAtish Patra } 672e0eb483SAtish Patra 682e0eb483SAtish Patra void install_memreserve_table(void) 692e0eb483SAtish Patra { 702e0eb483SAtish Patra struct linux_efi_memreserve *rsv; 712e0eb483SAtish Patra efi_guid_t memreserve_table_guid = LINUX_EFI_MEMRESERVE_TABLE_GUID; 722e0eb483SAtish Patra efi_status_t status; 732e0eb483SAtish Patra 742e0eb483SAtish Patra status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, sizeof(*rsv), 752e0eb483SAtish Patra (void **)&rsv); 762e0eb483SAtish Patra if (status != EFI_SUCCESS) { 772e0eb483SAtish Patra pr_efi_err("Failed to allocate memreserve entry!\n"); 782e0eb483SAtish Patra return; 792e0eb483SAtish Patra } 802e0eb483SAtish Patra 812e0eb483SAtish Patra rsv->next = 0; 822e0eb483SAtish Patra rsv->size = 0; 832e0eb483SAtish Patra atomic_set(&rsv->count, 0); 842e0eb483SAtish Patra 852e0eb483SAtish Patra status = efi_bs_call(install_configuration_table, 862e0eb483SAtish Patra &memreserve_table_guid, rsv); 872e0eb483SAtish Patra if (status != EFI_SUCCESS) 882e0eb483SAtish Patra pr_efi_err("Failed to install memreserve config table!\n"); 892e0eb483SAtish Patra } 902e0eb483SAtish Patra 912e0eb483SAtish Patra static unsigned long get_dram_base(void) 922e0eb483SAtish Patra { 932e0eb483SAtish Patra efi_status_t status; 942e0eb483SAtish Patra unsigned long map_size, buff_size; 952e0eb483SAtish Patra unsigned long membase = EFI_ERROR; 962e0eb483SAtish Patra struct efi_memory_map map; 972e0eb483SAtish Patra efi_memory_desc_t *md; 982e0eb483SAtish Patra struct efi_boot_memmap boot_map; 992e0eb483SAtish Patra 1002e0eb483SAtish Patra boot_map.map = (efi_memory_desc_t **)&map.map; 1012e0eb483SAtish Patra boot_map.map_size = &map_size; 1022e0eb483SAtish Patra boot_map.desc_size = &map.desc_size; 1032e0eb483SAtish Patra boot_map.desc_ver = NULL; 1042e0eb483SAtish Patra boot_map.key_ptr = NULL; 1052e0eb483SAtish Patra boot_map.buff_size = &buff_size; 1062e0eb483SAtish Patra 1072e0eb483SAtish Patra status = efi_get_memory_map(&boot_map); 1082e0eb483SAtish Patra if (status != EFI_SUCCESS) 1092e0eb483SAtish Patra return membase; 1102e0eb483SAtish Patra 1112e0eb483SAtish Patra map.map_end = map.map + map_size; 1122e0eb483SAtish Patra 1132e0eb483SAtish Patra for_each_efi_memory_desc_in_map(&map, md) { 1142e0eb483SAtish Patra if (md->attribute & EFI_MEMORY_WB) { 1152e0eb483SAtish Patra if (membase > md->phys_addr) 1162e0eb483SAtish Patra membase = md->phys_addr; 1172e0eb483SAtish Patra } 1182e0eb483SAtish Patra } 1192e0eb483SAtish Patra 1202e0eb483SAtish Patra efi_bs_call(free_pool, map.map); 1212e0eb483SAtish Patra 1222e0eb483SAtish Patra return membase; 1232e0eb483SAtish Patra } 1242e0eb483SAtish Patra 1252e0eb483SAtish Patra /* 1262e0eb483SAtish Patra * This function handles the architcture specific differences between arm and 1272e0eb483SAtish Patra * arm64 regarding where the kernel image must be loaded and any memory that 1282e0eb483SAtish Patra * must be reserved. On failure it is required to free all 1292e0eb483SAtish Patra * all allocations it has made. 1302e0eb483SAtish Patra */ 1312e0eb483SAtish Patra efi_status_t handle_kernel_image(unsigned long *image_addr, 1322e0eb483SAtish Patra unsigned long *image_size, 1332e0eb483SAtish Patra unsigned long *reserve_addr, 1342e0eb483SAtish Patra unsigned long *reserve_size, 1352e0eb483SAtish Patra unsigned long dram_base, 1362e0eb483SAtish Patra efi_loaded_image_t *image); 1372e0eb483SAtish Patra 1382e0eb483SAtish Patra asmlinkage void __noreturn efi_enter_kernel(unsigned long entrypoint, 1392e0eb483SAtish Patra unsigned long fdt_addr, 1402e0eb483SAtish Patra unsigned long fdt_size); 1412e0eb483SAtish Patra 1422e0eb483SAtish Patra /* 1432e0eb483SAtish Patra * EFI entry point for the arm/arm64 EFI stubs. This is the entrypoint 1442e0eb483SAtish Patra * that is described in the PE/COFF header. Most of the code is the same 1452e0eb483SAtish Patra * for both archictectures, with the arch-specific code provided in the 1462e0eb483SAtish Patra * handle_kernel_image() function. 1472e0eb483SAtish Patra */ 1482e0eb483SAtish Patra efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg) 1492e0eb483SAtish Patra { 1502e0eb483SAtish Patra efi_loaded_image_t *image; 1512e0eb483SAtish Patra efi_status_t status; 1522e0eb483SAtish Patra unsigned long image_addr; 1532e0eb483SAtish Patra unsigned long image_size = 0; 1542e0eb483SAtish Patra unsigned long dram_base; 1552e0eb483SAtish Patra /* addr/point and size pairs for memory management*/ 1562e0eb483SAtish Patra unsigned long initrd_addr = 0; 1572e0eb483SAtish Patra unsigned long initrd_size = 0; 1582e0eb483SAtish Patra unsigned long fdt_addr = 0; /* Original DTB */ 1592e0eb483SAtish Patra unsigned long fdt_size = 0; 1602e0eb483SAtish Patra char *cmdline_ptr = NULL; 1612e0eb483SAtish Patra int cmdline_size = 0; 1622e0eb483SAtish Patra efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID; 1632e0eb483SAtish Patra unsigned long reserve_addr = 0; 1642e0eb483SAtish Patra unsigned long reserve_size = 0; 1652e0eb483SAtish Patra enum efi_secureboot_mode secure_boot; 1662e0eb483SAtish Patra struct screen_info *si; 1672e0eb483SAtish Patra efi_properties_table_t *prop_tbl; 1682e0eb483SAtish Patra unsigned long max_addr; 1692e0eb483SAtish Patra 1702e0eb483SAtish Patra sys_table = sys_table_arg; 1712e0eb483SAtish Patra 1722e0eb483SAtish Patra /* Check if we were booted by the EFI firmware */ 1732e0eb483SAtish Patra if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { 1742e0eb483SAtish Patra status = EFI_INVALID_PARAMETER; 1752e0eb483SAtish Patra goto fail; 1762e0eb483SAtish Patra } 1772e0eb483SAtish Patra 1782e0eb483SAtish Patra status = check_platform_features(); 1792e0eb483SAtish Patra if (status != EFI_SUCCESS) 1802e0eb483SAtish Patra goto fail; 1812e0eb483SAtish Patra 1822e0eb483SAtish Patra /* 1832e0eb483SAtish Patra * Get a handle to the loaded image protocol. This is used to get 1842e0eb483SAtish Patra * information about the running image, such as size and the command 1852e0eb483SAtish Patra * line. 1862e0eb483SAtish Patra */ 1872e0eb483SAtish Patra status = sys_table->boottime->handle_protocol(handle, 1882e0eb483SAtish Patra &loaded_image_proto, (void *)&image); 1892e0eb483SAtish Patra if (status != EFI_SUCCESS) { 1902e0eb483SAtish Patra pr_efi_err("Failed to get loaded image protocol\n"); 1912e0eb483SAtish Patra goto fail; 1922e0eb483SAtish Patra } 1932e0eb483SAtish Patra 1942e0eb483SAtish Patra dram_base = get_dram_base(); 1952e0eb483SAtish Patra if (dram_base == EFI_ERROR) { 1962e0eb483SAtish Patra pr_efi_err("Failed to find DRAM base\n"); 1972e0eb483SAtish Patra status = EFI_LOAD_ERROR; 1982e0eb483SAtish Patra goto fail; 1992e0eb483SAtish Patra } 2002e0eb483SAtish Patra 2012e0eb483SAtish Patra /* 2022e0eb483SAtish Patra * Get the command line from EFI, using the LOADED_IMAGE 2032e0eb483SAtish Patra * protocol. We are going to copy the command line into the 2042e0eb483SAtish Patra * device tree, so this can be allocated anywhere. 2052e0eb483SAtish Patra */ 2062e0eb483SAtish Patra cmdline_ptr = efi_convert_cmdline(image, &cmdline_size, ULONG_MAX); 2072e0eb483SAtish Patra if (!cmdline_ptr) { 2082e0eb483SAtish Patra pr_efi_err("getting command line via LOADED_IMAGE_PROTOCOL\n"); 2092e0eb483SAtish Patra status = EFI_OUT_OF_RESOURCES; 2102e0eb483SAtish Patra goto fail; 2112e0eb483SAtish Patra } 2122e0eb483SAtish Patra 2132e0eb483SAtish Patra if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || 2142e0eb483SAtish Patra IS_ENABLED(CONFIG_CMDLINE_FORCE) || 2152e0eb483SAtish Patra cmdline_size == 0) 2162e0eb483SAtish Patra efi_parse_options(CONFIG_CMDLINE); 2172e0eb483SAtish Patra 2182e0eb483SAtish Patra if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0) 2192e0eb483SAtish Patra efi_parse_options(cmdline_ptr); 2202e0eb483SAtish Patra 2212e0eb483SAtish Patra pr_efi("Booting Linux Kernel...\n"); 2222e0eb483SAtish Patra 2232e0eb483SAtish Patra si = setup_graphics(); 2242e0eb483SAtish Patra 2252e0eb483SAtish Patra status = handle_kernel_image(&image_addr, &image_size, 2262e0eb483SAtish Patra &reserve_addr, 2272e0eb483SAtish Patra &reserve_size, 2282e0eb483SAtish Patra dram_base, image); 2292e0eb483SAtish Patra if (status != EFI_SUCCESS) { 2302e0eb483SAtish Patra pr_efi_err("Failed to relocate kernel\n"); 2312e0eb483SAtish Patra goto fail_free_cmdline; 2322e0eb483SAtish Patra } 2332e0eb483SAtish Patra 2342e0eb483SAtish Patra efi_retrieve_tpm2_eventlog(); 2352e0eb483SAtish Patra 2362e0eb483SAtish Patra /* Ask the firmware to clear memory on unclean shutdown */ 2372e0eb483SAtish Patra efi_enable_reset_attack_mitigation(); 2382e0eb483SAtish Patra 2392e0eb483SAtish Patra secure_boot = efi_get_secureboot(); 2402e0eb483SAtish Patra 2412e0eb483SAtish Patra /* 2422e0eb483SAtish Patra * Unauthenticated device tree data is a security hazard, so ignore 2432e0eb483SAtish Patra * 'dtb=' unless UEFI Secure Boot is disabled. We assume that secure 2442e0eb483SAtish Patra * boot is enabled if we can't determine its state. 2452e0eb483SAtish Patra */ 2462e0eb483SAtish Patra if (!IS_ENABLED(CONFIG_EFI_ARMSTUB_DTB_LOADER) || 2472e0eb483SAtish Patra secure_boot != efi_secureboot_mode_disabled) { 2482e0eb483SAtish Patra if (strstr(cmdline_ptr, "dtb=")) 2492e0eb483SAtish Patra pr_efi("Ignoring DTB from command line.\n"); 2502e0eb483SAtish Patra } else { 2512e0eb483SAtish Patra status = efi_load_dtb(image, &fdt_addr, &fdt_size); 2522e0eb483SAtish Patra 2532e0eb483SAtish Patra if (status != EFI_SUCCESS) { 2542e0eb483SAtish Patra pr_efi_err("Failed to load device tree!\n"); 2552e0eb483SAtish Patra goto fail_free_image; 2562e0eb483SAtish Patra } 2572e0eb483SAtish Patra } 2582e0eb483SAtish Patra 2592e0eb483SAtish Patra if (fdt_addr) { 2602e0eb483SAtish Patra pr_efi("Using DTB from command line\n"); 2612e0eb483SAtish Patra } else { 2622e0eb483SAtish Patra /* Look for a device tree configuration table entry. */ 2632e0eb483SAtish Patra fdt_addr = (uintptr_t)get_fdt(&fdt_size); 2642e0eb483SAtish Patra if (fdt_addr) 2652e0eb483SAtish Patra pr_efi("Using DTB from configuration table\n"); 2662e0eb483SAtish Patra } 2672e0eb483SAtish Patra 2682e0eb483SAtish Patra if (!fdt_addr) 2692e0eb483SAtish Patra pr_efi("Generating empty DTB\n"); 2702e0eb483SAtish Patra 2712e0eb483SAtish Patra if (!noinitrd()) { 2722e0eb483SAtish Patra max_addr = efi_get_max_initrd_addr(dram_base, image_addr); 2732e0eb483SAtish Patra status = efi_load_initrd_dev_path(&initrd_addr, &initrd_size, 2742e0eb483SAtish Patra max_addr); 2752e0eb483SAtish Patra if (status == EFI_SUCCESS) { 2762e0eb483SAtish Patra pr_efi("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n"); 2772e0eb483SAtish Patra } else if (status == EFI_NOT_FOUND) { 2782e0eb483SAtish Patra status = efi_load_initrd(image, &initrd_addr, &initrd_size, 2792e0eb483SAtish Patra ULONG_MAX, max_addr); 2802e0eb483SAtish Patra if (status == EFI_SUCCESS && initrd_size > 0) 2812e0eb483SAtish Patra pr_efi("Loaded initrd from command line option\n"); 2822e0eb483SAtish Patra } 2832e0eb483SAtish Patra if (status != EFI_SUCCESS) 2842e0eb483SAtish Patra pr_efi_err("Failed to load initrd!\n"); 2852e0eb483SAtish Patra } 2862e0eb483SAtish Patra 2872e0eb483SAtish Patra efi_random_get_seed(); 2882e0eb483SAtish Patra 2892e0eb483SAtish Patra /* 2902e0eb483SAtish Patra * If the NX PE data feature is enabled in the properties table, we 2912e0eb483SAtish Patra * should take care not to create a virtual mapping that changes the 2922e0eb483SAtish Patra * relative placement of runtime services code and data regions, as 2932e0eb483SAtish Patra * they may belong to the same PE/COFF executable image in memory. 2942e0eb483SAtish Patra * The easiest way to achieve that is to simply use a 1:1 mapping. 2952e0eb483SAtish Patra */ 2962e0eb483SAtish Patra prop_tbl = get_efi_config_table(EFI_PROPERTIES_TABLE_GUID); 2972e0eb483SAtish Patra flat_va_mapping = prop_tbl && 2982e0eb483SAtish Patra (prop_tbl->memory_protection_attribute & 2992e0eb483SAtish Patra EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA); 3002e0eb483SAtish Patra 3012e0eb483SAtish Patra /* hibernation expects the runtime regions to stay in the same place */ 3022e0eb483SAtish Patra if (!IS_ENABLED(CONFIG_HIBERNATION) && !nokaslr() && !flat_va_mapping) { 3032e0eb483SAtish Patra /* 3042e0eb483SAtish Patra * Randomize the base of the UEFI runtime services region. 3052e0eb483SAtish Patra * Preserve the 2 MB alignment of the region by taking a 3062e0eb483SAtish Patra * shift of 21 bit positions into account when scaling 3072e0eb483SAtish Patra * the headroom value using a 32-bit random value. 3082e0eb483SAtish Patra */ 3092e0eb483SAtish Patra static const u64 headroom = EFI_RT_VIRTUAL_LIMIT - 3102e0eb483SAtish Patra EFI_RT_VIRTUAL_BASE - 3112e0eb483SAtish Patra EFI_RT_VIRTUAL_SIZE; 3122e0eb483SAtish Patra u32 rnd; 3132e0eb483SAtish Patra 3142e0eb483SAtish Patra status = efi_get_random_bytes(sizeof(rnd), (u8 *)&rnd); 3152e0eb483SAtish Patra if (status == EFI_SUCCESS) { 3162e0eb483SAtish Patra virtmap_base = EFI_RT_VIRTUAL_BASE + 3172e0eb483SAtish Patra (((headroom >> 21) * rnd) >> (32 - 21)); 3182e0eb483SAtish Patra } 3192e0eb483SAtish Patra } 3202e0eb483SAtish Patra 3212e0eb483SAtish Patra install_memreserve_table(); 3222e0eb483SAtish Patra 3232e0eb483SAtish Patra status = allocate_new_fdt_and_exit_boot(handle, &fdt_addr, 3242e0eb483SAtish Patra efi_get_max_fdt_addr(dram_base), 3252e0eb483SAtish Patra initrd_addr, initrd_size, 3262e0eb483SAtish Patra cmdline_ptr, fdt_addr, fdt_size); 3272e0eb483SAtish Patra if (status != EFI_SUCCESS) 3282e0eb483SAtish Patra goto fail_free_initrd; 3292e0eb483SAtish Patra 3302e0eb483SAtish Patra efi_enter_kernel(image_addr, fdt_addr, fdt_totalsize((void *)fdt_addr)); 3312e0eb483SAtish Patra /* not reached */ 3322e0eb483SAtish Patra 3332e0eb483SAtish Patra fail_free_initrd: 3342e0eb483SAtish Patra pr_efi_err("Failed to update FDT and exit boot services\n"); 3352e0eb483SAtish Patra 3362e0eb483SAtish Patra efi_free(initrd_size, initrd_addr); 3372e0eb483SAtish Patra efi_free(fdt_size, fdt_addr); 3382e0eb483SAtish Patra 3392e0eb483SAtish Patra fail_free_image: 3402e0eb483SAtish Patra efi_free(image_size, image_addr); 3412e0eb483SAtish Patra efi_free(reserve_size, reserve_addr); 3422e0eb483SAtish Patra fail_free_cmdline: 3432e0eb483SAtish Patra free_screen_info(si); 3442e0eb483SAtish Patra efi_free(cmdline_size, (unsigned long)cmdline_ptr); 3452e0eb483SAtish Patra fail: 3462e0eb483SAtish Patra return status; 3472e0eb483SAtish Patra } 3482e0eb483SAtish Patra 3492e0eb483SAtish Patra /* 3502e0eb483SAtish Patra * efi_get_virtmap() - create a virtual mapping for the EFI memory map 3512e0eb483SAtish Patra * 3522e0eb483SAtish Patra * This function populates the virt_addr fields of all memory region descriptors 3532e0eb483SAtish Patra * in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors 3542e0eb483SAtish Patra * are also copied to @runtime_map, and their total count is returned in @count. 3552e0eb483SAtish Patra */ 3562e0eb483SAtish Patra void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size, 3572e0eb483SAtish Patra unsigned long desc_size, efi_memory_desc_t *runtime_map, 3582e0eb483SAtish Patra int *count) 3592e0eb483SAtish Patra { 3602e0eb483SAtish Patra u64 efi_virt_base = virtmap_base; 3612e0eb483SAtish Patra efi_memory_desc_t *in, *out = runtime_map; 3622e0eb483SAtish Patra int l; 3632e0eb483SAtish Patra 3642e0eb483SAtish Patra for (l = 0; l < map_size; l += desc_size) { 3652e0eb483SAtish Patra u64 paddr, size; 3662e0eb483SAtish Patra 3672e0eb483SAtish Patra in = (void *)memory_map + l; 3682e0eb483SAtish Patra if (!(in->attribute & EFI_MEMORY_RUNTIME)) 3692e0eb483SAtish Patra continue; 3702e0eb483SAtish Patra 3712e0eb483SAtish Patra paddr = in->phys_addr; 3722e0eb483SAtish Patra size = in->num_pages * EFI_PAGE_SIZE; 3732e0eb483SAtish Patra 3742e0eb483SAtish Patra in->virt_addr = in->phys_addr; 3752e0eb483SAtish Patra if (novamap()) { 3762e0eb483SAtish Patra continue; 3772e0eb483SAtish Patra } 3782e0eb483SAtish Patra 3792e0eb483SAtish Patra /* 3802e0eb483SAtish Patra * Make the mapping compatible with 64k pages: this allows 3812e0eb483SAtish Patra * a 4k page size kernel to kexec a 64k page size kernel and 3822e0eb483SAtish Patra * vice versa. 3832e0eb483SAtish Patra */ 3842e0eb483SAtish Patra if (!flat_va_mapping) { 3852e0eb483SAtish Patra 3862e0eb483SAtish Patra paddr = round_down(in->phys_addr, SZ_64K); 3872e0eb483SAtish Patra size += in->phys_addr - paddr; 3882e0eb483SAtish Patra 3892e0eb483SAtish Patra /* 3902e0eb483SAtish Patra * Avoid wasting memory on PTEs by choosing a virtual 3912e0eb483SAtish Patra * base that is compatible with section mappings if this 3922e0eb483SAtish Patra * region has the appropriate size and physical 3932e0eb483SAtish Patra * alignment. (Sections are 2 MB on 4k granule kernels) 3942e0eb483SAtish Patra */ 3952e0eb483SAtish Patra if (IS_ALIGNED(in->phys_addr, SZ_2M) && size >= SZ_2M) 3962e0eb483SAtish Patra efi_virt_base = round_up(efi_virt_base, SZ_2M); 3972e0eb483SAtish Patra else 3982e0eb483SAtish Patra efi_virt_base = round_up(efi_virt_base, SZ_64K); 3992e0eb483SAtish Patra 4002e0eb483SAtish Patra in->virt_addr += efi_virt_base - paddr; 4012e0eb483SAtish Patra efi_virt_base += size; 4022e0eb483SAtish Patra } 4032e0eb483SAtish Patra 4042e0eb483SAtish Patra memcpy(out, in, desc_size); 4052e0eb483SAtish Patra out = (void *)out + desc_size; 4062e0eb483SAtish Patra ++*count; 4072e0eb483SAtish Patra } 4082e0eb483SAtish Patra } 409