• Guo Ren's avatar
    csky: Fixup cpu speculative execution to IO area · aefd9461
    Guo Ren authored
    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: default avatarGuo Ren <guoren@linux.alibaba.com>
    aefd9461
smp.c 5.06 KB