[src/trunk]: src/sys/arch/sparc/sparc pause other cpus from KGDB. XXX: need ...

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

details:   https://anonhg.NetBSD.org/src/rev/344b5352479d
branches:  trunk
changeset: 511951:344b5352479d
user:      mrg <mrg%NetBSD.org@localhost>
date:      Sat Jun 30 20:17:47 2001 +0000

description:
pause other cpus from KGDB.  XXX: need to implement other cpu trapframe access.

diffstat:

 sys/arch/sparc/sparc/kgdb_machdep.c |  80 ++++++++++++++++++++++++++++++++----
 1 files changed, 71 insertions(+), 9 deletions(-)

diffs (111 lines):

diff -r 67fe7c72e534 -r 344b5352479d sys/arch/sparc/sparc/kgdb_machdep.c
--- a/sys/arch/sparc/sparc/kgdb_machdep.c       Sat Jun 30 20:16:49 2001 +0000
+++ b/sys/arch/sparc/sparc/kgdb_machdep.c       Sat Jun 30 20:17:47 2001 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kgdb_machdep.c,v 1.8 2001/05/26 10:22:32 pk Exp $ */
+/*     $NetBSD: kgdb_machdep.c,v 1.9 2001/06/30 20:17:47 mrg Exp $ */
 /*-
  * Copyright (c) 1997 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -88,6 +88,7 @@
  */
 
 #include "opt_kgdb.h"
+#include "opt_multiprocessor.h"
 
 #ifdef KGDB
 
@@ -131,6 +132,61 @@
 }
 
 /*
+ * Deal with KGDB in a MP environment. XXX need to have "mach cpu" equiv.
+ */
+#ifdef MULTIPROCESSOR
+
+#define NOCPU -1
+
+static int kgdb_suspend_others(void);
+static void kgdb_resume_others(void);
+static void kgdb_suspend(void);
+
+__cpu_simple_lock_t kgdb_lock;
+int kgdb_cpu = NOCPU;
+
+static int
+kgdb_suspend_others(void)
+{
+       int cpu_me = cpu_number();
+       int win;
+
+       if (cpus == NULL)
+               return 1;
+
+       __cpu_simple_lock(&kgdb_lock);
+       if (kgdb_cpu == NOCPU)
+               kgdb_cpu = cpu_me;
+       win = (kgdb_cpu == cpu_me);
+       __cpu_simple_unlock(&kgdb_lock);
+
+       if (win)
+               mp_pause_cpus();
+
+       return win;
+}
+
+static void
+kgdb_resume_others(void)
+{
+
+       mp_resume_cpus();
+
+       __cpu_simple_lock(&kgdb_lock);
+       kgdb_cpu = NOCPU;
+       __cpu_simple_unlock(&kgdb_lock);
+}
+
+static void
+kgdb_suspend()
+{
+
+       while (cpuinfo.flags & CPUFLG_PAUSED)
+               cpuinfo.cache_flush((caddr_t)&cpuinfo.flags, sizeof(cpuinfo.flags));
+}
+#endif
+
+/*
  * Trap into kgdb to wait for debugger to connect,
  * noting on the console why nothing else is going on.
  */
@@ -144,17 +200,23 @@
 #if NFB > 0
        fb_unblank();
 #endif
+#ifdef MULTIPROCESSOR
        /* While we're in the debugger, pause all other CPUs */
-       mp_pause_cpus();
+       if (!kgdb_suspend_others()) {
+               kgdb_suspend();
+       } else {
+#endif
+               if (verbose)
+                       printf("kgdb waiting...");
+               __asm("ta %0" :: "n" (T_KGDB_EXEC));    /* trap into kgdb */
 
-       if (verbose)
-               printf("kgdb waiting...");
-       __asm("ta %0" :: "n" (T_KGDB_EXEC));    /* trap into kgdb */
+               kgdb_debug_panic = 1;
 
-       kgdb_debug_panic = 1;
-
-       /* Other CPUs can continue now */
-       mp_resume_cpus();
+#ifdef MULTIPROCESSOR
+               /* Other CPUs can continue now */
+               kgdb_resume_others();
+       }
+#endif
 }
 
 /*