df857416a1
Several kernel subsystems need to know details about CPU system register values, sometimes for CPUs other than that they are executing on. Rather than hard-coding system register accesses and cross-calls for these cases, this patch adds logic to record various system register values at boot-time. This may be used for feature reporting, firmware bug detection, etc. Separate hooks are added for the boot and hotplug paths to enable one-time intialisation and cold/warm boot value mismatch detection in later patches. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*
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* Record and handle CPU attributes.
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*
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* Copyright (C) 2014 ARM Ltd.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <asm/arch_timer.h>
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#include <asm/cachetype.h>
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#include <asm/cpu.h>
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#include <asm/cputype.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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/*
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* In case the boot CPU is hotpluggable, we record its initial state and
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* current state separately. Certain system registers may contain different
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* values depending on configuration at or after reset.
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*/
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DEFINE_PER_CPU(struct cpuinfo_arm64, cpu_data);
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static struct cpuinfo_arm64 boot_cpu_data;
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static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info)
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{
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info->reg_cntfrq = arch_timer_get_cntfrq();
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info->reg_ctr = read_cpuid_cachetype();
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info->reg_dczid = read_cpuid(DCZID_EL0);
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info->reg_midr = read_cpuid_id();
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info->reg_id_aa64isar0 = read_cpuid(ID_AA64ISAR0_EL1);
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info->reg_id_aa64isar1 = read_cpuid(ID_AA64ISAR1_EL1);
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info->reg_id_aa64mmfr0 = read_cpuid(ID_AA64MMFR0_EL1);
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info->reg_id_aa64mmfr1 = read_cpuid(ID_AA64MMFR1_EL1);
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info->reg_id_aa64pfr0 = read_cpuid(ID_AA64PFR0_EL1);
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info->reg_id_aa64pfr1 = read_cpuid(ID_AA64PFR1_EL1);
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info->reg_id_isar0 = read_cpuid(ID_ISAR0_EL1);
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info->reg_id_isar1 = read_cpuid(ID_ISAR1_EL1);
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info->reg_id_isar2 = read_cpuid(ID_ISAR2_EL1);
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info->reg_id_isar3 = read_cpuid(ID_ISAR3_EL1);
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info->reg_id_isar4 = read_cpuid(ID_ISAR4_EL1);
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info->reg_id_isar5 = read_cpuid(ID_ISAR5_EL1);
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info->reg_id_mmfr0 = read_cpuid(ID_MMFR0_EL1);
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info->reg_id_mmfr1 = read_cpuid(ID_MMFR1_EL1);
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info->reg_id_mmfr2 = read_cpuid(ID_MMFR2_EL1);
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info->reg_id_mmfr3 = read_cpuid(ID_MMFR3_EL1);
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info->reg_id_pfr0 = read_cpuid(ID_PFR0_EL1);
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info->reg_id_pfr1 = read_cpuid(ID_PFR1_EL1);
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}
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void cpuinfo_store_cpu(void)
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{
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struct cpuinfo_arm64 *info = this_cpu_ptr(&cpu_data);
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__cpuinfo_store_cpu(info);
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}
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void __init cpuinfo_store_boot_cpu(void)
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{
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struct cpuinfo_arm64 *info = &per_cpu(cpu_data, 0);
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__cpuinfo_store_cpu(info);
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boot_cpu_data = *info;
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}
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