[src/trunk]: src/sys/arch/powerpc/oea Split set_timebase() into get_timebase_...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/023a28a3db0e
branches:  trunk
changeset: 981226:023a28a3db0e
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Fri Mar 05 02:58:13 2021 +0000

description:
Split set_timebase() into get_timebase_frequency() and init_decrementer().
Call get_timebase_frequency() much earlier.

diffstat:

 sys/arch/powerpc/oea/ofwoea_machdep.c |  40 ++++++++++++++++++++++------------
 1 files changed, 26 insertions(+), 14 deletions(-)

diffs (118 lines):

diff -r c1b214afed3b -r 023a28a3db0e sys/arch/powerpc/oea/ofwoea_machdep.c
--- a/sys/arch/powerpc/oea/ofwoea_machdep.c     Fri Mar 05 01:33:33 2021 +0000
+++ b/sys/arch/powerpc/oea/ofwoea_machdep.c     Fri Mar 05 02:58:13 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ofwoea_machdep.c,v 1.57 2021/03/05 01:33:33 thorpej Exp $ */
+/* $NetBSD: ofwoea_machdep.c,v 1.58 2021/03/05 02:58:13 thorpej Exp $ */
 
 /*-
  * Copyright (c) 2007 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ofwoea_machdep.c,v 1.57 2021/03/05 01:33:33 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ofwoea_machdep.c,v 1.58 2021/03/05 02:58:13 thorpej Exp $");
 
 #include "ksyms.h"
 #include "wsdisplay.h"
@@ -136,8 +136,10 @@
 extern uint32_t ns_per_tick;
 extern uint32_t ticks_per_intr;
 
+static void get_timebase_frequency(void);
+static void init_decrementer(void);
+
 static void restore_ofmap(void);
-static void set_timebase(void);
 
 void
 ofwoea_initppc(u_int startkernel, u_int endkernel, char *args)
@@ -172,6 +174,9 @@
                        bootpath[len] = 0;
        }
 
+       /* Get the timebase frequency from the firmware. */
+       get_timebase_frequency();
+
        /* Initialize bus_space */
        ofwoea_bus_space_init();
 
@@ -267,8 +272,8 @@
        ksyms_addsyms_elf((int)((uintptr_t)endsym - (uintptr_t)startsym), startsym, endsym);
 #endif
 
-       /* CPU clock stuff */
-       set_timebase();
+       /* Kick off the clock. */
+       init_decrementer();
 
 #ifdef DDB
        if (boothowto & RB_KDB)
@@ -276,22 +281,22 @@
 #endif
 }
 
-void
-set_timebase(void)
+static void
+get_timebase_frequency(void)
 {
-       int qhandle, phandle, msr, scratch, node;
+       int qhandle, phandle, node;
        char type[32];
 
        if (timebase_freq != 0) {
                ticks_per_sec = timebase_freq;
-               goto found;
+               return;
        }
 
        node = OF_finddevice("/cpus/@0");
        if (node != -1 &&
            OF_getprop(node, "timebase-frequency", &ticks_per_sec,
                       sizeof ticks_per_sec) > 0) {
-               goto found;
+               return;
        }
 
        node = OF_finddevice("/");
@@ -300,7 +305,7 @@
                    && strcmp(type, "cpu") == 0
                    && OF_getprop(qhandle, "timebase-frequency",
                        &ticks_per_sec, sizeof ticks_per_sec) > 0) {
-                       goto found;
+                       return;
                }
                if ((phandle = OF_child(qhandle)))
                        continue;
@@ -311,8 +316,15 @@
                }
        }
        panic("no cpu node");
+}
 
-found:
+static void
+init_decrementer(void)
+{
+       int scratch, msr;
+
+       KASSERT(ticks_per_sec != 0);
+
        __asm volatile ("mfmsr %0; andi. %1,%0,%2; mtmsr %1"
                : "=r"(msr), "=r"(scratch) : "K"((u_short)~PSL_EE));
        ns_per_tick = 1000000000 / ticks_per_sec;
@@ -321,10 +333,10 @@
 
 #ifdef PPC_OEA601
        if ((mfpvr() >> 16) == MPC601)
-           curcpu()->ci_lasttb = rtc_nanosecs();
+               curcpu()->ci_lasttb = rtc_nanosecs();
        else
 #endif
-       curcpu()->ci_lasttb = mftbl();
+               curcpu()->ci_lasttb = mftbl();
 
        mtspr(SPR_DEC, ticks_per_intr);
        mtmsr(msr);