Date: Fri, 19 Apr 2019 15:20:59 -0700 From: Mark Millard <marklmi@yahoo.com> To: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org>, Justin Hibbits <chmeeedalf@gmail.com> Subject: head -r346144 vs. "or 27,27,27" use (via cpu_spinwait) Message-ID: <B2B3221D-71F9-48ED-9CA3-FE3650F1C377@yahoo.com>
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There still seems to be:
/usr/src/sys/powerpc/include/cpu.h:#define cpu_spinwait() =
__asm __volatile("or 27,27,27") /* yield */
used in powerpc_ipi_handler and ofw_rendezvous_dispatch
and mpc85xx_jog_set_int .
(It is not clear to me what the status of "or 27,27,27" is
on older processors, like in PowerMacs. 27 was not
documented before PowerISA 2.06 . (I looked in 2.03, 2.04,
2.05, 2.06B V2, 2.07, and 3.0B.)
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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