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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-04-14 15:36:28 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-04-14 15:37:27 +0200
commitb6112ccbff5ec580d46b584ecc3c3a773b830da2 (patch)
tree71553f09a2acfedec85f3c29a1c65e0a257001fb /arch/s390/kernel/early.c
parent5b409ed17bb32c8316b1f456466c70529454573a (diff)
downloadlinux-2.6.34-ux500-b6112ccbff5ec580d46b584ecc3c3a773b830da2.tar.gz
[S390] add read_persistent_clock
Add a read_persistent_clock function that does not just return 0. Since timekeeping_init calls the function before time_init has been called move reset_tod_clock to early.c to make sure that the TOD clock is running when read_persistent_clock is invoked. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/early.c')
-rw-r--r--arch/s390/kernel/early.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index d4e1e5b6cfd..cf09948faad 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -38,6 +38,21 @@ static unsigned long machine_flags;
static void __init setup_boot_command_line(void);
+/*
+ * Get the TOD clock running.
+ */
+static void __init reset_tod_clock(void)
+{
+ u64 time;
+
+ if (store_clock(&time) == 0)
+ return;
+ /* TOD clock not running. Set the clock to Unix Epoch. */
+ if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0)
+ disabled_wait(0);
+
+ sched_clock_base_cc = TOD_UNIX_EPOCH;
+}
#ifdef CONFIG_SHARED_KERNEL
int __init savesys_ipl_nss(char *cmd, const int cmdlen);
@@ -372,6 +387,7 @@ static void __init setup_boot_command_line(void)
*/
void __init startup_init(void)
{
+ reset_tod_clock();
ipl_save_parameters();
rescue_initrd();
clear_bss_section();