Commit 8077e66b authored by Guo Ren's avatar Guo Ren
Browse files

csky: Add cpu feature register hint for smp 



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: default avatarGuo Ren <guoren@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
parent e95a4f8c

arch/csky/kernel/smp.c

+3 −0
Original line number Diff line number Diff line
@@ -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);