1 /* 2 * Record and handle CPU attributes. 3 * 4 * Copyright (C) 2014 ARM Ltd. 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 #include <asm/arch_timer.h> 18 #include <asm/cachetype.h> 19 #include <asm/cpu.h> 20 #include <asm/cputype.h> 21 22 #include <linux/init.h> 23 #include <linux/smp.h> 24 25 /* 26 * In case the boot CPU is hotpluggable, we record its initial state and 27 * current state separately. Certain system registers may contain different 28 * values depending on configuration at or after reset. 29 */ 30 DEFINE_PER_CPU(struct cpuinfo_arm64, cpu_data); 31 static struct cpuinfo_arm64 boot_cpu_data; 32 33 static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) 34 { 35 info->reg_cntfrq = arch_timer_get_cntfrq(); 36 info->reg_ctr = read_cpuid_cachetype(); 37 info->reg_dczid = read_cpuid(DCZID_EL0); 38 info->reg_midr = read_cpuid_id(); 39 40 info->reg_id_aa64isar0 = read_cpuid(ID_AA64ISAR0_EL1); 41 info->reg_id_aa64isar1 = read_cpuid(ID_AA64ISAR1_EL1); 42 info->reg_id_aa64mmfr0 = read_cpuid(ID_AA64MMFR0_EL1); 43 info->reg_id_aa64mmfr1 = read_cpuid(ID_AA64MMFR1_EL1); 44 info->reg_id_aa64pfr0 = read_cpuid(ID_AA64PFR0_EL1); 45 info->reg_id_aa64pfr1 = read_cpuid(ID_AA64PFR1_EL1); 46 47 info->reg_id_isar0 = read_cpuid(ID_ISAR0_EL1); 48 info->reg_id_isar1 = read_cpuid(ID_ISAR1_EL1); 49 info->reg_id_isar2 = read_cpuid(ID_ISAR2_EL1); 50 info->reg_id_isar3 = read_cpuid(ID_ISAR3_EL1); 51 info->reg_id_isar4 = read_cpuid(ID_ISAR4_EL1); 52 info->reg_id_isar5 = read_cpuid(ID_ISAR5_EL1); 53 info->reg_id_mmfr0 = read_cpuid(ID_MMFR0_EL1); 54 info->reg_id_mmfr1 = read_cpuid(ID_MMFR1_EL1); 55 info->reg_id_mmfr2 = read_cpuid(ID_MMFR2_EL1); 56 info->reg_id_mmfr3 = read_cpuid(ID_MMFR3_EL1); 57 info->reg_id_pfr0 = read_cpuid(ID_PFR0_EL1); 58 info->reg_id_pfr1 = read_cpuid(ID_PFR1_EL1); 59 } 60 61 void cpuinfo_store_cpu(void) 62 { 63 struct cpuinfo_arm64 *info = this_cpu_ptr(&cpu_data); 64 __cpuinfo_store_cpu(info); 65 } 66 67 void __init cpuinfo_store_boot_cpu(void) 68 { 69 struct cpuinfo_arm64 *info = &per_cpu(cpu_data, 0); 70 __cpuinfo_store_cpu(info); 71 72 boot_cpu_data = *info; 73 } 74