1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include "error.h" 4 #include "misc.h" 5 6 bool init_unaccepted_memory(void) 7 { 8 guid_t guid = LINUX_EFI_UNACCEPTED_MEM_TABLE_GUID; 9 struct efi_unaccepted_memory *table; 10 unsigned long cfg_table_pa; 11 unsigned int cfg_table_len; 12 enum efi_type et; 13 int ret; 14 15 et = efi_get_type(boot_params_ptr); 16 if (et == EFI_TYPE_NONE) 17 return false; 18 19 ret = efi_get_conf_table(boot_params_ptr, &cfg_table_pa, &cfg_table_len); 20 if (ret) { 21 warn("EFI config table not found."); 22 return false; 23 } 24 25 table = (void *)efi_find_vendor_table(boot_params_ptr, cfg_table_pa, 26 cfg_table_len, guid); 27 if (!table) 28 return false; 29 30 if (table->version != 1) 31 error("Unknown version of unaccepted memory table\n"); 32 33 /* 34 * In many cases unaccepted_table is already set by EFI stub, but it 35 * has to be initialized again to cover cases when the table is not 36 * allocated by EFI stub or EFI stub copied the kernel image with 37 * efi_relocate_kernel() before the variable is set. 38 * 39 * It must be initialized before the first usage of accept_memory(). 40 */ 41 unaccepted_table = table; 42 43 return true; 44 } 45