[PATCH 03/13] csky: Add cpu feature register hint for smp

[guoren]

From: Guo Ren <guo...@linux.alibaba.com>

CPU features registers are setup by customers' bootloader, but
Linux must help transfer them from the primary to secondary cores.
This patch add hint2 CPU feature register supported.

Signed-off-by: Guo Ren <guo...@linux.alibaba.com>
Cc: Arnd Bergmann <a...@arndb.de>
---
 arch/csky/kernel/smp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c
index b5c5bc3..1945fb2 100644
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -156,6 +156,7 @@ void __init setup_smp(void)
 extern void _start_smp_secondary(void);
 
 volatile unsigned int secondary_hint;
+volatile unsigned int secondary_hint2;
 volatile unsigned int secondary_ccr;
 volatile unsigned int secondary_stack;
 
@@ -168,6 +169,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
        secondary_stack =
                (unsigned int) task_stack_page(tidle) + THREAD_SIZE - 8;
        secondary_hint = mfcr("cr31");
+       secondary_hint2 = mfcr("cr<21, 1>");
        secondary_ccr  = mfcr("cr18");
        secondary_msa1 = read_mmu_msa1();
 
@@ -209,6 +211,7 @@ void csky_start_secondary(void)
        unsigned int cpu = smp_processor_id();
 
        mtcr("cr31", secondary_hint);
+       mtcr("cr<21, 1>", secondary_hint2);
        mtcr("cr18", secondary_ccr);
 
        mtcr("vbr", vec_base);
-- 
2.7.4