2 * Copyright (C) 2012 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #ifndef __ASM_CPUTYPE_H
17 #define __ASM_CPUTYPE_H
19 #define ID_MIDR_EL1 "midr_el1"
20 #define ID_MPIDR_EL1 "mpidr_el1"
21 #define ID_CTR_EL0 "ctr_el0"
23 #define ID_AA64PFR0_EL1 "id_aa64pfr0_el1"
24 #define ID_AA64DFR0_EL1 "id_aa64dfr0_el1"
25 #define ID_AA64AFR0_EL1 "id_aa64afr0_el1"
26 #define ID_AA64ISAR0_EL1 "id_aa64isar0_el1"
27 #define ID_AA64MMFR0_EL1 "id_aa64mmfr0_el1"
29 #define INVALID_HWID ULONG_MAX
31 #define MPIDR_HWID_BITMASK 0xff00ffffff
33 #define MPIDR_LEVEL_BITS_SHIFT 3
34 #define MPIDR_LEVEL_BITS (1 << MPIDR_LEVEL_BITS_SHIFT)
35 #define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1)
37 #define MPIDR_LEVEL_SHIFT(level) \
38 (((1 << level) >> 1) << MPIDR_LEVEL_BITS_SHIFT)
40 #define MPIDR_AFFINITY_LEVEL(mpidr, level) \
41 ((mpidr >> MPIDR_LEVEL_SHIFT(level)) & MPIDR_LEVEL_MASK)
43 #define read_cpuid(reg) ({ \
45 asm("mrs %0, " reg : "=r" (__val)); \
49 #define ARM_CPU_IMP_ARM 0x41
50 #define ARM_CPU_IMP_APM 0x50
52 #define ARM_CPU_PART_AEM_V8 0xD0F0
53 #define ARM_CPU_PART_FOUNDATION 0xD000
54 #define ARM_CPU_PART_CORTEX_A57 0xD070
56 #define APM_CPU_PART_POTENZA 0x0000
61 * The CPU ID never changes at run time, so we might as well tell the
62 * compiler that it's constant. Use this function to read the CPU ID
63 * rather than directly reading processor_id or read_cpuid() directly.
65 static inline u32 __attribute_const__ read_cpuid_id(void)
67 return read_cpuid(ID_MIDR_EL1);
70 static inline u64 __attribute_const__ read_cpuid_mpidr(void)
72 return read_cpuid(ID_MPIDR_EL1);
75 static inline unsigned int __attribute_const__ read_cpuid_implementor(void)
77 return (read_cpuid_id() & 0xFF000000) >> 24;
80 static inline unsigned int __attribute_const__ read_cpuid_part_number(void)
82 return (read_cpuid_id() & 0xFFF0);
85 static inline u32 __attribute_const__ read_cpuid_cachetype(void)
87 return read_cpuid(ID_CTR_EL0);
90 #endif /* __ASSEMBLY__ */