diff options
| author | Noam Camus <noamc@ezchip.com> | 2013-06-03 15:17:25 +0300 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2016-05-09 09:32:33 +0530 |
| commit | 86c25466f7414d6396f1aaa13e4b34f36ec272d5 (patch) | |
| tree | 908b67ed82896362bcb7e438c8b6849ea3b2a2c7 /arch/arc/kernel/ctx_sw.c | |
| parent | b1f2f6f3cf5e37f0418f6cebf365cff7c3abf6d7 (diff) | |
ARC: [plat-eznps] Use dedicated identity auxiliary register.
With generic "identity" num of CPUs is limited to 256 (8 bit).
We use our alternative AUX register GLOBAL_ID (12 bit).
Now we can support up to 4096 CPUs.
Signed-off-by: Noam Camus <noamc@ezchip.com>
Diffstat (limited to 'arch/arc/kernel/ctx_sw.c')
| -rw-r--r-- | arch/arc/kernel/ctx_sw.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arc/kernel/ctx_sw.c b/arch/arc/kernel/ctx_sw.c index 5d446df2c413..6f4cb0dab1b9 100644 --- a/arch/arc/kernel/ctx_sw.c +++ b/arch/arc/kernel/ctx_sw.c @@ -16,6 +16,9 @@ #include <asm/asm-offsets.h> #include <linux/sched.h> +#ifdef CONFIG_ARC_PLAT_EZNPS +#include <plat/ctop.h> +#endif #define KSP_WORD_OFF ((TASK_THREAD + THREAD_KSP) / 4) @@ -67,9 +70,16 @@ __switch_to(struct task_struct *prev_task, struct task_struct *next_task) #ifndef CONFIG_SMP "st %2, [@_current_task] \n\t" #else +#ifdef CONFIG_ARC_PLAT_EZNPS + "lr r24, [%4] \n\t" +#ifndef CONFIG_EZNPS_MTM_EXT + "lsr r24, r24, 4 \n\t" +#endif +#else "lr r24, [identity] \n\t" "lsr r24, r24, 8 \n\t" "bmsk r24, r24, 7 \n\t" +#endif "add2 r24, @_current_task, r24 \n\t" "st %2, [r24] \n\t" #endif @@ -107,6 +117,9 @@ __switch_to(struct task_struct *prev_task, struct task_struct *next_task) : "=r"(tmp) : "n"(KSP_WORD_OFF), "r"(next), "r"(prev) +#ifdef CONFIG_ARC_PLAT_EZNPS + , "i"(CTOP_AUX_LOGIC_GLOBAL_ID) +#endif : "blink" ); |