csky: Add cpu feature register hint for smp (8077e66b) · Commits · 戴 / test

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>

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);

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