arch/arm/include/asm/cputype.h

   1 #ifndef __ASM_ARM_CPUTYPE_H
   2 #define __ASM_ARM_CPUTYPE_H
   3
   4 #include <linux/stringify.h>
   5
   6 #define CPUID_ID        0
   7 #define CPUID_CACHETYPE 1
   8 #define CPUID_TCM       2
   9 #define CPUID_TLBTYPE   3
  10
  11 #define CPUID_EXT_PFR0  "c1, 0"
  12 #define CPUID_EXT_PFR1  "c1, 1"
  13 #define CPUID_EXT_DFR0  "c1, 2"
  14 #define CPUID_EXT_AFR0  "c1, 3"
  15 #define CPUID_EXT_MMFR0 "c1, 4"
  16 #define CPUID_EXT_MMFR1 "c1, 5"
  17 #define CPUID_EXT_MMFR2 "c1, 6"
  18 #define CPUID_EXT_MMFR3 "c1, 7"
  19 #define CPUID_EXT_ISAR0 "c2, 0"
  20 #define CPUID_EXT_ISAR1 "c2, 1"
  21 #define CPUID_EXT_ISAR2 "c2, 2"
  22 #define CPUID_EXT_ISAR3 "c2, 3"
  23 #define CPUID_EXT_ISAR4 "c2, 4"
  24 #define CPUID_EXT_ISAR5 "c2, 5"
  25
  26 #ifdef CONFIG_CPU_CP15
  27 #define read_cpuid(reg)                                                 \
  28         ({                                                              \
  29                 unsigned int __val;                                     \
  30                 asm("mrc        p15, 0, %0, c0, c0, " __stringify(reg)  \
  31                     : "=r" (__val)                                      \
  32                     :                                                   \
  33                     : "cc");                                            \
  34                 __val;                                                  \
  35         })
  36 #define read_cpuid_ext(ext_reg)                                         \
  37         ({                                                              \
  38                 unsigned int __val;                                     \
  39                 asm("mrc        p15, 0, %0, c0, " ext_reg               \
  40                     : "=r" (__val)                                      \
  41                     :                                                   \
  42                     : "cc");                                            \
  43                 __val;                                                  \
  44         })
  45 #else
  46 extern unsigned int processor_id;
  47 #define read_cpuid(reg) (processor_id)
  48 #define read_cpuid_ext(reg) 0
  49 #endif
  50
  51 /*
  52  * The CPU ID never changes at run time, so we might as well tell the
  53  * compiler that it's constant.  Use this function to read the CPU ID
  54  * rather than directly reading processor_id or read_cpuid() directly.
  55  */
  56 static inline unsigned int __attribute_const__ read_cpuid_id(void)
  57 {
  58         return read_cpuid(CPUID_ID);
  59 }
  60
  61 static inline unsigned int __attribute_const__ read_cpuid_cachetype(void)
  62 {
  63         return read_cpuid(CPUID_CACHETYPE);
  64 }
  65
  66 /*
  67  * Intel's XScale3 core supports some v6 features (supersections, L2)
  68  * but advertises itself as v5 as it does not support the v6 ISA.  For
  69  * this reason, we need a way to explicitly test for this type of CPU.
  70  */
  71 #ifndef CONFIG_CPU_XSC3
  72 #define cpu_is_xsc3()   0
  73 #else
  74 static inline int cpu_is_xsc3(void)
  75 {
  76         if ((read_cpuid_id() & 0xffffe000) == 0x69056000)
  77                 return 1;
  78
  79         return 0;
  80 }
  81 #endif
  82
  83 #if !defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_CPU_XSC3)
  84 #define cpu_is_xscale() 0
  85 #else
  86 #define cpu_is_xscale() 1
  87 #endif
  88
  89 #endif