_cpuid() - full cpuid instruction wrapper

- the prototype changes to 

	_cpuid(u32_t *eax, u32_t *ebx, u32_t *ecx, u32_t *edx)

- this makes possible to use all the features of the cpuid instruction as
  described in the Intel specs

include/minix/cpufeature.h

@@ -18,6 +18,9 @@
 #define _CPUF_I386_SSE4_1	11
 #define _CPUF_I386_SSE4_2	12
 
+#define _CPUF_I386_HTT		13	/* Supports HTT */
+#define _CPUF_I386_HTT_MAX_NUM	14	/* Maximal num of threads */
+
 _PROTOTYPE(int _cpufeature, (int featureno));
 
 #endif

include/minix/minlib.h

@@ -15,7 +15,7 @@ _PROTOTYPE(void std_err, (char *_s));
 _PROTOTYPE(void prints, (const char *_s, ...));
 _PROTOTYPE(int fsversion, (char *_dev, char *_prog));
 _PROTOTYPE(int getprocessor, (void));
-_PROTOTYPE(void _cpuid, (u32_t eax_in, u32_t *eax, u32_t *ebx, u32_t *ecx, u32_t *edx));
+_PROTOTYPE(void _cpuid, (u32_t *eax, u32_t *ebx, u32_t *ecx, u32_t *edx));
 _PROTOTYPE(int load_mtab, (char *_prog_name));
 _PROTOTYPE(int rewrite_mtab, (char *_prog_name));
 _PROTOTYPE(int get_mtab_entry, (char *_s1, char *_s2, char *_s3, char *_s4));

include/sys/vm_i386.h

@@ -75,6 +75,7 @@ sys/vm_i386.h
 #define CPUID1_EDX_PGE 		(1L << 13)	/* Page Global (bit) Enable */
 #define CPUID1_EDX_APIC_ON_CHIP (1L << 9)	/* APIC is present on the chip */
 #define CPUID1_EDX_TSC		(1L << 4)	/* Timestamp counter present */
+#define CPUID1_EDX_HTT		(1L << 28)	/* Supports HTT */
 #define CPUID1_EDX_FXSR		(1L << 24)
 #define CPUID1_EDX_SSE		(1L << 25)
 #define CPUID1_EDX_SSE2		(1L << 26)