9cce7a435f
This patch adds AArch64 CPU specific functionality. It assumes that the implementation is generic to AArch64 and does not require specific identification. Different CPU implementations may require the setting of various ACTLR_EL1 bits but such information is not currently available and it should ideally be pushed to firmware. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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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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#ifndef __ASM_CPUTYPE_H
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#define __ASM_CPUTYPE_H
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#define ID_MIDR_EL1 "midr_el1"
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#define ID_CTR_EL0 "ctr_el0"
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#define ID_AA64PFR0_EL1 "id_aa64pfr0_el1"
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#define ID_AA64DFR0_EL1 "id_aa64dfr0_el1"
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#define ID_AA64AFR0_EL1 "id_aa64afr0_el1"
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#define ID_AA64ISAR0_EL1 "id_aa64isar0_el1"
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#define ID_AA64MMFR0_EL1 "id_aa64mmfr0_el1"
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#define read_cpuid(reg) ({ \
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u64 __val; \
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asm("mrs %0, " reg : "=r" (__val)); \
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__val; \
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})
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/*
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* The CPU ID never changes at run time, so we might as well tell the
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* compiler that it's constant. Use this function to read the CPU ID
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* rather than directly reading processor_id or read_cpuid() directly.
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*/
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static inline u32 __attribute_const__ read_cpuid_id(void)
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{
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return read_cpuid(ID_MIDR_EL1);
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}
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static inline u32 __attribute_const__ read_cpuid_cachetype(void)
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{
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return read_cpuid(ID_CTR_EL0);
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}
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#endif
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