Date: Sun, 8 Dec 2013 15:25:19 +0000 (UTC) From: Marius Strobl <marius@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r259102 - head/sys/sparc64/sparc64 Message-ID: <201312081525.rB8FPJK0023252@svn.freebsd.org>
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Author: marius Date: Sun Dec 8 15:25:19 2013 New Revision: 259102 URL: http://svnweb.freebsd.org/changeset/base/259102 Log: Restore a vital comment nuked in r259016. Modified: head/sys/sparc64/sparc64/machdep.c Modified: head/sys/sparc64/sparc64/machdep.c ============================================================================== --- head/sys/sparc64/sparc64/machdep.c Sun Dec 8 14:21:54 2013 (r259101) +++ head/sys/sparc64/sparc64/machdep.c Sun Dec 8 15:25:19 2013 (r259102) @@ -553,6 +553,13 @@ sparc64_init(caddr_t mdp, u_long o1, u_l * trigger a fatal reset error or worse things further down the road. * XXX it should be possible to use this solely instead of writing * %tba in cpu_setregs(). Doing so causes a hang however. + * + * NB: the low-level console drivers require a working DELAY() and + * some compiler optimizations may cause the curthread accesses of + * mutex(9) to be factored out even if the latter aren't actually + * called. Both of these require PCPU_REG to be set. However, we + * can't set PCPU_REG without also taking over the trap table or the + * firmware will overwrite it. */ sun4u_set_traptable(tl0_base);
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