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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: Guo Ren <guoren@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Guo Ren 2020-07-28 10:44:57 +00:00
parent e95a4f8cb9
commit 8077e66bc3
1 changed files with 3 additions and 0 deletions
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3
arch/csky/kernel/smp.c
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@ -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);