tree 154610764681f5a99c0c06de06d0dcd7fcb108f4
parent e722c756a5d2c288d6dcc210c4e943094074f8f9
author Elliott Hughes <enh@google.com> 1692745066 -0700
committer Elliott Hughes <enh@google.com> 1693234092 +0000

sysconf(): implement cache queries.

This is a bit disappointing. I'd not implemented this in the past
because it wasn't available on all platforms, and -- although the
riscv64 implementation was just a cool optimization -- I thought that
the /sys stuff was actually portable, until I ran it on arm64 hardware.
So here we have getauxval() for riscv64, /sys for x86-64, and our best
guess based on ctr_el0 for arm64.

Bug: http://b/294034962
Test: ran tests on the host, an arm64 device, and riscv64 host and qemu
Change-Id: I420b69b976d30668d4d2ac548c4229e2a4eafb20