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csky: Fixup cpu speculative execution to IO area

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For the memory size ( > 512MB, < 1GB), the MSA setting is:

 - SSEG0: PHY_START        , PHY_START + 512MB
 - SSEG1: PHY_START + 512MB, PHY_START + 1GB

But the real memory is no more than 1GB, there is a gap between the
end size of memory and border of 1GB. CPU could speculatively
execute to that gap and if the gap of the bus couldn't respond to
the CPU request, then the crash will happen.

Now make the setting with:

 - SSEG0: PHY_START        , PHY_START + 512MB (no change)
 - SSEG1: Disabled (We use highmem to use the memory of 512MB~1GB)

We also deprecated zhole_szie[] settings, it's only used by arm
style CPUs. All memory gap should use Reserved setting of dts in
csky system.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
This commit is contained in:
Guo Ren
2020-03-28 19:14:37 +08:00
parent 8f6bb793b2
commit aefd9461d3
5 changed files with 25 additions and 58 deletions
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3
arch/csky/kernel/smp.c
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@@ -159,6 +159,8 @@ volatile unsigned int secondary_hint;
volatile unsigned int secondary_ccr;
volatile unsigned int secondary_stack;
unsigned long secondary_msa1;
int __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
unsigned long mask = 1 << cpu;
@@ -167,6 +169,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
(unsigned int) task_stack_page(tidle) + THREAD_SIZE - 8;
secondary_hint = mfcr("cr31");
secondary_ccr = mfcr("cr18");
secondary_msa1 = read_mmu_msa1();
/*
* Because other CPUs are in reset status, we must flush data