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 INVALID_HWID            ULONG_MAX
  20
  21 #define MPIDR_HWID_BITMASK      0xff00ffffff
  22
  23 #define read_cpuid(reg) ({                                              \
  24         u64 __val;                                                      \
  25         asm("mrs        %0, " #reg : "=r" (__val));                     \
  26         __val;                                                          \
  27 })
  28
  29 #define ARM_CPU_IMP_ARM         0x41
  30 #define ARM_CPU_IMP_APM         0x50
  31
  32 #define ARM_CPU_PART_AEM_V8     0xD0F0
  33 #define ARM_CPU_PART_FOUNDATION 0xD000
  34 #define ARM_CPU_PART_CORTEX_A57 0xD070
  35
  36 #define APM_CPU_PART_POTENZA    0x0000
  37
  38 #ifndef __ASSEMBLY__
  39
  40 /*
  41  * The CPU ID never changes at run time, so we might as well tell the
  42  * compiler that it's constant.  Use this function to read the CPU ID
  43  * rather than directly reading processor_id or read_cpuid() directly.
  44  */
  45 static inline u32 __attribute_const__ read_cpuid_id(void)
  46 {
  47         return read_cpuid(MIDR_EL1);
  48 }
  49
  50 static inline u64 __attribute_const__ read_cpuid_mpidr(void)
  51 {
  52         return read_cpuid(MPIDR_EL1);
  53 }
  54
  55 static inline unsigned int __attribute_const__ read_cpuid_implementor(void)
  56 {
  57         return (read_cpuid_id() & 0xFF000000) >> 24;
  58 }
  59
  60 static inline unsigned int __attribute_const__ read_cpuid_part_number(void)
  61 {
  62         return (read_cpuid_id() & 0xFFF0);
  63 }
  64
  65 static inline u32 __attribute_const__ read_cpuid_cachetype(void)
  66 {
  67         return read_cpuid(CTR_EL0);
  68 }
  69
  70 #endif /* __ASSEMBLY__ */
  71
  72 #endif