diff options
author | Philippe Gerum <rpm@xenomai.org> | 2009-10-27 22:05:31 +0100 |
---|---|---|
committer | Mike Frysinger <vapier@gentoo.org> | 2009-12-15 00:15:12 -0500 |
commit | d2685fb7b4df2850359d6ee297269a285886032d (patch) | |
tree | fada248782a4bd8e774836ee40ee0bc672bad4a8 /arch/blackfin/kernel | |
parent | ab843c7940394584d5ec548f443cb431c0752ca5 (diff) |
Blackfin/ipipe: prepare status bitops for SMP support
Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Signed-off-by: Li Yi <yi.li@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/kernel')
-rw-r--r-- | arch/blackfin/kernel/ipipe.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/ipipe.c b/arch/blackfin/kernel/ipipe.c index 5d7382396dc..a77307a4473 100644 --- a/arch/blackfin/kernel/ipipe.c +++ b/arch/blackfin/kernel/ipipe.c @@ -335,3 +335,70 @@ void __ipipe_enable_root_irqs_hw(void) __clear_bit(IPIPE_STALL_FLAG, &ipipe_root_cpudom_var(status)); bfin_sti(bfin_irq_flags); } + +/* + * We could use standard atomic bitops in the following root status + * manipulation routines, but let's prepare for SMP support in the + * same move, preventing CPU migration as required. + */ +void __ipipe_stall_root(void) +{ + unsigned long *p, flags; + + local_irq_save_hw(flags); + p = &__ipipe_root_status; + __set_bit(IPIPE_STALL_FLAG, p); + local_irq_restore_hw(flags); +} +EXPORT_SYMBOL(__ipipe_stall_root); + +unsigned long __ipipe_test_and_stall_root(void) +{ + unsigned long *p, flags; + int x; + + local_irq_save_hw(flags); + p = &__ipipe_root_status; + x = __test_and_set_bit(IPIPE_STALL_FLAG, p); + local_irq_restore_hw(flags); + + return x; +} +EXPORT_SYMBOL(__ipipe_test_and_stall_root); + +unsigned long __ipipe_test_root(void) +{ + const unsigned long *p; + unsigned long flags; + int x; + + local_irq_save_hw_smp(flags); + p = &__ipipe_root_status; + x = test_bit(IPIPE_STALL_FLAG, p); + local_irq_restore_hw_smp(flags); + + return x; +} +EXPORT_SYMBOL(__ipipe_test_root); + +void __ipipe_lock_root(void) +{ + unsigned long *p, flags; + + local_irq_save_hw(flags); + p = &__ipipe_root_status; + __set_bit(IPIPE_SYNCDEFER_FLAG, p); + local_irq_restore_hw(flags); +} +EXPORT_SYMBOL(__ipipe_lock_root); + +void __ipipe_unlock_root(void) +{ + unsigned long *p, flags; + + local_irq_save_hw(flags); + p = &__ipipe_root_status; + __clear_bit(IPIPE_SYNCDEFER_FLAG, p); + local_irq_restore_hw(flags); +} +EXPORT_SYMBOL(__ipipe_unlock_root); |