cpu_has_xfeatures

Name:Return whether the system supports a given xfeature.* Also return the name of the (most advanced) feature that the caller requested:

Proto:int cpu_has_xfeatures(u64 xfeatures_needed, const char **feature_name)

Type:int

Parameter:

Type	Parameter	Name
u64	xfeatures_needed
const char **	feature_name

79

xfeatures_missing = xfeatures_needed & ~Mask of xstate features supported by the CPU and the kernel:

81

If Value for the false possibility is greater at compile time(feature_name) Then

91

If xfeatures_missing Then xfeatures_print = xfeatures_missing

93

Else xfeatures_print = xfeatures_needed

96

xfeature_idx = ls64 - find last set bit in a 64-bit word*@x: the word to search* This is defined in a similar way as the libc and compiler builtin* ffsll, but returns the position of the most significant set bit - 1

97

max_idx = ARRAY_SIZE - get the number of elements in array @arr*@arr: array to be sized(Although we spell it out in here, the Processor Trace* xfeature is completely unused. We use other mechanisms* to save/restore PT state in Linux.) - 1

98

xfeature_idx = min - return minimum of two values of the same or compatible types*@x: first value*@y: second value(xfeature_idx, max_idx)

100

feature_name = Although we spell it out in here, the Processor Trace* xfeature is completely unused. We use other mechanisms* to save/restore PT state in Linux.[xfeature_idx]

103

If xfeatures_missing Then Return 0

106

Return 1

**Caller**
Name	Describe
print_xstate_feature

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