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csky: Add cpu feature register hint for smp

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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);