arch/arm64/include/asm/cputype.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  *
   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.
   7  *
   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.
  12  *
  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/>.
  15  */
  16 #ifndef __ASM_CPUTYPE_H
  17 #define __ASM_CPUTYPE_H
  18
  19 #define ID_MIDR_EL1             "midr_el1"
  20 #define ID_MPIDR_EL1            "mpidr_el1"
  21 #define ID_CTR_EL0              "ctr_el0"
  22
  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"
  28
  29 #define read_cpuid(reg) ({                                              \
  30         u64 __val;                                                      \
  31         asm("mrs        %0, " reg : "=r" (__val));                      \
  32         __val;                                                          \
  33 })
  34
  35 #define ARM_CPU_IMP_ARM         0x41
  36
  37 #define ARM_CPU_PART_AEM_V8     0xD0F0
  38 #define ARM_CPU_PART_FOUNDATION 0xD000
  39 #define ARM_CPU_PART_CORTEX_A57 0xD070
  40
  41 /*
  42  * The CPU ID never changes at run time, so we might as well tell the
  43  * compiler that it's constant.  Use this function to read the CPU ID
  44  * rather than directly reading processor_id or read_cpuid() directly.
  45  */
  46 static inline u32 __attribute_const__ read_cpuid_id(void)
  47 {
  48         return read_cpuid(ID_MIDR_EL1);
  49 }
  50
  51 static inline u64 __attribute_const__ read_cpuid_mpidr(void)
  52 {
  53         return read_cpuid(ID_MPIDR_EL1);
  54 }
  55
  56 static inline unsigned int __attribute_const__ read_cpuid_implementor(void)
  57 {
  58         return (read_cpuid_id() & 0xFF000000) >> 24;
  59 }
  60
  61 static inline unsigned int __attribute_const__ read_cpuid_part_number(void)
  62 {
  63         return (read_cpuid_id() & 0xFFF0);
  64 }
  65
  66 static inline u32 __attribute_const__ read_cpuid_cachetype(void)
  67 {
  68         return read_cpuid(ID_CTR_EL0);
  69 }
  70
  71 #endif