> From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> > What do these bitmasks look like? what do the bits mean? > Where does a user find this info? The XSAVE state component bitmaps are detailed in the Intel Software Developer's Manual, volume 1, Chapter 13: "Managing State using the XSAVE Feature Set". http://intel.com/sdm In the kernel source, they are enumerated in xstate.c and you can observe them in dmesg: [ 0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x008: 'MPX bounds registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x010: 'MPX CSR' Thanks, -Len
