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cputype.h

#ifndef __ASM_ARM_CPUTYPE_H
#define __ASM_ARM_CPUTYPE_H

#include <linux/stringify.h>

#define CPUID_ID  0
#define CPUID_CACHETYPE 1
#define CPUID_TCM 2
#define CPUID_TLBTYPE   3

#ifdef CONFIG_CPU_CP15
#define read_cpuid(reg)                                     \
      ({                                              \
            unsigned int __val;                             \
            asm("mrc    p15, 0, %0, c0, c0, " __stringify(reg)    \
                : "=r" (__val)                              \
                :                                     \
                : "cc");                                    \
            __val;                                          \
      })
#else
extern unsigned int processor_id;
#define read_cpuid(reg) (processor_id)
#endif

/*
 * The CPU ID never changes at run time, so we might as well tell the
 * compiler that it's constant.  Use this function to read the CPU ID
 * rather than directly reading processor_id or read_cpuid() directly.
 */
static inline unsigned int __attribute_const__ read_cpuid_id(void)
{
      return read_cpuid(CPUID_ID);
}

static inline unsigned int __attribute_const__ read_cpuid_cachetype(void)
{
      return read_cpuid(CPUID_CACHETYPE);
}

/*
 * Intel's XScale3 core supports some v6 features (supersections, L2)
 * but advertises itself as v5 as it does not support the v6 ISA.  For
 * this reason, we need a way to explicitly test for this type of CPU.
 */
#ifndef CONFIG_CPU_XSC3
#define cpu_is_xsc3()   0
#else
static inline int cpu_is_xsc3(void)
{
      if ((read_cpuid_id() & 0xffffe000) == 0x69056000)
            return 1;

      return 0;
}
#endif

#if !defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_CPU_XSC3)
#define     cpu_is_xscale()   0
#else
#define     cpu_is_xscale()   1
#endif

#endif

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