LXR linux/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 INVALID_HWID            ULONG_MAX
  30
  31#define MPIDR_HWID_BITMASK      0xff00ffffff
  32
  33#define read_cpuid(reg) ({                                              \
  34        u64 __val;                                                      \
  35        asm("mrs        %0, " reg : "=r" (__val));                      \
  36        __val;                                                          \
  37})
  38
  39#define ARM_CPU_IMP_ARM         0x41
  40
  41#define ARM_CPU_PART_AEM_V8     0xD0F0
  42#define ARM_CPU_PART_FOUNDATION 0xD000
  43#define ARM_CPU_PART_CORTEX_A57 0xD070
  44
  45#ifndef __ASSEMBLY__
  46
  47/*
  48 * The CPU ID never changes at run time, so we might as well tell the
  49 * compiler that it's constant.  Use this function to read the CPU ID
  50 * rather than directly reading processor_id or read_cpuid() directly.
  51 */
  52static inline u32 __attribute_const__ read_cpuid_id(void)
  53{
  54        return read_cpuid(ID_MIDR_EL1);
  55}
  56
  57static inline u64 __attribute_const__ read_cpuid_mpidr(void)
  58{
  59        return read_cpuid(ID_MPIDR_EL1);
  60}
  61
  62static inline unsigned int __attribute_const__ read_cpuid_implementor(void)
  63{
  64        return (read_cpuid_id() & 0xFF000000) >> 24;
  65}
  66
  67static inline unsigned int __attribute_const__ read_cpuid_part_number(void)
  68{
  69        return (read_cpuid_id() & 0xFFF0);
  70}
  71
  72static inline u32 __attribute_const__ read_cpuid_cachetype(void)
  73{
  74        return read_cpuid(ID_CTR_EL0);
  75}
  76
  77#endif /* __ASSEMBLY__ */
  78
  79#endif
  80