| From | Andy Shevchenko <> | Date | Sat, 3 Nov 2018 15:11:39 +0200 | Subject | Re: [PATCH v15 11/23] x86/sgx: Add definitions for SGX's CPUID leaf and variable sub-leafs |
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On Sat, Nov 3, 2018 at 1:16 AM Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> 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
-- With Best Regards, Andy Shevchenko
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