diff options
| author | Visa Hankala <visa@cvs.openbsd.org> | 2020-06-05 13:35:22 +0000 |
|---|---|---|
| committer | Visa Hankala <visa@cvs.openbsd.org> | 2020-06-05 13:35:22 +0000 |
| commit | a0f3dde5a3e915c50c58719da031e61796ad31d5 (patch) | |
| tree | f44bb20b66169c1d7dbe96609f439b24d76ab563 /sys/arch/mips64 | |
| parent | 97cc7a3fd21417c0b1a491585132a92bea64ea93 (diff) | |
cpu_rnd_messybits() for mips64
Use CP0 Count as a basis. Also take noise from virtual memory activity
by including BadVAddr.
OK deraadt@ dlg@
Diffstat (limited to 'sys/arch/mips64')
| -rw-r--r-- | sys/arch/mips64/mips64/cp0access.S | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/sys/arch/mips64/mips64/cp0access.S b/sys/arch/mips64/mips64/cp0access.S index 642b800ea79..062293f7335 100644 --- a/sys/arch/mips64/mips64/cp0access.S +++ b/sys/arch/mips64/mips64/cp0access.S @@ -1,4 +1,4 @@ -/* $OpenBSD: cp0access.S,v 1.20 2016/08/16 13:03:58 visa Exp $ */ +/* $OpenBSD: cp0access.S,v 1.21 2020/06/05 13:35:20 visa Exp $ */ /* * Copyright (c) 2001-2003 Opsycon AB (www.opsycon.se / www.opsycon.com) @@ -220,3 +220,15 @@ LEAF(cp0_set_trapbase, 0) NOP END(cp0_set_trapbase) #endif + +LEAF(cpu_rnd_messybits, 0) + MFC0 v0, COP_0_COUNT + MFC0_HAZARD +#ifndef CPU_R8000 + MFC0 v1, COP_0_BAD_VADDR + MFC0_HAZARD + xor v0, v1 +#endif + j ra + NOP +END(cpu_rnd_messybits) |