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_CTR_EL0              "ctr_el0"
  21
  22 #define ID_AA64PFR0_EL1         "id_aa64pfr0_el1"
  23 #define ID_AA64DFR0_EL1         "id_aa64dfr0_el1"
  24 #define ID_AA64AFR0_EL1         "id_aa64afr0_el1"
  25 #define ID_AA64ISAR0_EL1        "id_aa64isar0_el1"
  26 #define ID_AA64MMFR0_EL1        "id_aa64mmfr0_el1"
  27
  28 #define read_cpuid(reg) ({                                              \
  29         u64 __val;                                                      \
  30         asm("mrs        %0, " reg : "=r" (__val));                      \
  31         __val;                                                          \
  32 })
  33
  34 /*
  35  * The CPU ID never changes at run time, so we might as well tell the
  36  * compiler that it's constant.  Use this function to read the CPU ID
  37  * rather than directly reading processor_id or read_cpuid() directly.
  38  */
  39 static inline u32 __attribute_const__ read_cpuid_id(void)
  40 {
  41         return read_cpuid(ID_MIDR_EL1);
  42 }
  43
  44 static inline u32 __attribute_const__ read_cpuid_cachetype(void)
  45 {
  46         return read_cpuid(ID_CTR_EL0);
  47 }
  48
  49 #endif