• Maciej W. Rozycki's avatar
    [MIPS] DECstation: Optimised early printk() · 36de48de
    Maciej W. Rozycki authored
     This is an optimised implementation of early printk() for the DECstation.  
    After the recent conversion to a MIPS-specific generic routine using a 
    character-by-character output the performance dropped significantly.  
    This change reverts to the previous speed -- even at 9600 bps of the 
    serial console the difference is visible with a naked eye; I presume for a 
    framebuffer it is even worse (it may depend on exactly which one is used 
     Additionally the change includes a fix for a problem that the old 
    implementation had -- the format used would not actually limit the length 
    of the string output.  This new implementation uses a local buffer to deal 
    with it -- even with this additional copying it is much faster than the 
    generic function.
     Plus this driver is registered much earlier than the generic one, 
    allowing one to see critical messages, such as one about an incorrect CPU 
    setting used, that are produced beforehand. :-)
    Signed-off-by: default avatarMaciej W. Rozycki <macro@linux-mips.org>
    Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
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