On Sat, Nov 03, 2018 at 03:11:39PM +0200, Andy Shevchenko wrote: > On Sat, Nov 3, 2018 at 1:16 AM Jarkko Sakkinen > <jarkko.sakkinen@xxxxxxxxxxxxxxx> wrote: > > > > SGX defines its own CPUID leaf, 0x12, along with a variable number of > > sub-leafs. Sub-leafs 0 and 1 are always available if SGX is supported > > and enumerate various SGX features, e.g. instruction sets and enclave > > capabilities. Sub-leafs 2+ are variable, both in their existence and > > in what they enumerate. Bits 3:0 of EAX report the sub-leaf type, > > with the remaining bits in EAX, EBX, ECX and EDX being type-specific. > > Currently, the only known sub-leaf type enumerates an EPC section. An > > EPC section is simply a range of EPC memory available to software. > > The "list" of varaible SGX sub-leafs is NULL-terminated, i.e. software > > is expected to query CPUID until an invalid sub-leaf is encountered. > > > + SGX_CPUID_SUB_LEAF_TYPE_MASK = 0xF, > > GENMASK() if it suits here? > > P.S. Btw, BIT() and GENMASK() macros are now in a separate header, > i.e. linux/bits.h, perhaps you might need to revisit code to include > it explicitly Agreed. I would also think that is should be renamed simply as SGX_CPUID_SUBLEAF_MASK. /Jarkko
