/*
   *	Routines to indentify additional cpu features that are scattered in
   *	cpuid space.
   */
  #include <linux/cpu.h>
  
  #include <asm/pat.h>
  #include <asm/processor.h>
  
  #include <asm/apic.h>
  
  struct cpuid_bit {
  	u16 feature;
  	u8 reg;
  	u8 bit;
  	u32 level;
  	u32 sub_leaf;
  };
  
  enum cpuid_regs {
  	CR_EAX = 0,
  	CR_ECX,
  	CR_EDX,
  	CR_EBX
  };
  
  void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
  {
  	u32 max_level;
  	u32 regs[4];
  	const struct cpuid_bit *cb;
  
  	static const struct cpuid_bit __cpuinitconst cpuid_bits[] = {

  		{ X86_FEATURE_DTS,		CR_EAX, 0, 0x00000006, 0 },

  		{ X86_FEATURE_IDA,		CR_EAX, 1, 0x00000006, 0 },
  		{ X86_FEATURE_ARAT,		CR_EAX, 2, 0x00000006, 0 },

  		{ X86_FEATURE_PLN,		CR_EAX, 4, 0x00000006, 0 },
  		{ X86_FEATURE_PTS,		CR_EAX, 6, 0x00000006, 0 },

  		{ X86_FEATURE_APERFMPERF,	CR_ECX, 0, 0x00000006, 0 },
  		{ X86_FEATURE_EPB,		CR_ECX, 3, 0x00000006, 0 },
  		{ X86_FEATURE_XSAVEOPT,		CR_EAX,	0, 0x0000000d, 1 },
  		{ X86_FEATURE_CPB,		CR_EDX, 9, 0x80000007, 0 },
  		{ X86_FEATURE_NPT,		CR_EDX, 0, 0x8000000a, 0 },
  		{ X86_FEATURE_LBRV,		CR_EDX, 1, 0x8000000a, 0 },
  		{ X86_FEATURE_SVML,		CR_EDX, 2, 0x8000000a, 0 },
  		{ X86_FEATURE_NRIPS,		CR_EDX, 3, 0x8000000a, 0 },

  		{ X86_FEATURE_TSCRATEMSR,	CR_EDX, 4, 0x8000000a, 0 },
  		{ X86_FEATURE_VMCBCLEAN,	CR_EDX, 5, 0x8000000a, 0 },
  		{ X86_FEATURE_FLUSHBYASID,	CR_EDX, 6, 0x8000000a, 0 },
  		{ X86_FEATURE_DECODEASSISTS,	CR_EDX, 7, 0x8000000a, 0 },
  		{ X86_FEATURE_PAUSEFILTER,	CR_EDX,10, 0x8000000a, 0 },
  		{ X86_FEATURE_PFTHRESHOLD,	CR_EDX,12, 0x8000000a, 0 },

  		{ 0, 0, 0, 0, 0 }
  	};
  
  	for (cb = cpuid_bits; cb->feature; cb++) {
  
  		/* Verify that the level is valid */
  		max_level = cpuid_eax(cb->level & 0xffff0000);
  		if (max_level < cb->level ||
  		    max_level > (cb->level | 0xffff))
  			continue;
  
  		cpuid_count(cb->level, cb->sub_leaf, &regs[CR_EAX],
  			    &regs[CR_EBX], &regs[CR_ECX], &regs[CR_EDX]);
  
  		if (regs[cb->reg] & (1 << cb->bit))
  			set_cpu_cap(c, cb->feature);
  	}
  }