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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