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 INVALID_HWID ULONG_MAX
21 #define MPIDR_HWID_BITMASK 0xff00ffffff
23 #define MPIDR_LEVEL_BITS_SHIFT 3
24 #define MPIDR_LEVEL_BITS (1 << MPIDR_LEVEL_BITS_SHIFT)
25 #define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1)
27 #define MPIDR_LEVEL_SHIFT(level) \
28 (((1 << level) >> 1) << MPIDR_LEVEL_BITS_SHIFT)
30 #define MPIDR_AFFINITY_LEVEL(mpidr, level) \
31 ((mpidr >> MPIDR_LEVEL_SHIFT(level)) & MPIDR_LEVEL_MASK)
33 #define read_cpuid(reg) ({ \
35 asm("mrs %0, " #reg : "=r" (__val)); \
39 #define ARM_CPU_IMP_ARM 0x41
40 #define ARM_CPU_IMP_APM 0x50
42 #define ARM_CPU_PART_AEM_V8 0xD0F0
43 #define ARM_CPU_PART_FOUNDATION 0xD000
44 #define ARM_CPU_PART_CORTEX_A57 0xD070
46 #define APM_CPU_PART_POTENZA 0x0000
51 * The CPU ID never changes at run time, so we might as well tell the
52 * compiler that it's constant. Use this function to read the CPU ID
53 * rather than directly reading processor_id or read_cpuid() directly.
55 static inline u32 __attribute_const__ read_cpuid_id(void)
57 return read_cpuid(MIDR_EL1);
60 static inline u64 __attribute_const__ read_cpuid_mpidr(void)
62 return read_cpuid(MPIDR_EL1);
65 static inline unsigned int __attribute_const__ read_cpuid_implementor(void)
67 return (read_cpuid_id() & 0xFF000000) >> 24;
70 static inline unsigned int __attribute_const__ read_cpuid_part_number(void)
72 return (read_cpuid_id() & 0xFFF0);
75 static inline u32 __attribute_const__ read_cpuid_cachetype(void)
77 return read_cpuid(CTR_EL0);
80 #endif /* __ASSEMBLY__ */