HWCAP for SHA-1 and SHA-256

Jeffrey Walton noloader at gmail.com
Sat Feb 22 21:36:42 EST 2020

Hi Everyone,

I'm having trouble finding the HWCAP_* or HWCAP2_* for SHA-1 and
SHA-256 on x86 machines.

Poking around Torvald's GitHub does not reveal them in either auxvec.h
or hwcap2.h. Also see
Grepping my local machine (x86_64) provides them for arm64, but not
x86 (WTF?):

   $ grep -IR HWCAP2_ /usr/include
   /usr/include/x86_64-linux-gnu/asm/hwcap2.h:#ifndef _ASM_X86_HWCAP2_H
   /usr/include/x86_64-linux-gnu/asm/hwcap2.h:#define _ASM_X86_HWCAP2_H
HWCAP2_RING3MWAIT        (1 << 0)

What are the HWCAP_* or HWCAP2_* to use for SHA-1 and SHA-256 on x86 machines?

Thanks in advance.

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