• Gerald Schaefer's avatar
    s390/sclp: do not use static sccbs · 087c4d74
    Gerald Schaefer authored
    The sccbs for init/read/sdias/early have to be located below 2 GB, and
    they are currently defined as a static buffer.
    
    With a relocatable kernel that could reside at any place in memory, this
    will no longer guarantee the location below 2 GB, so use a dynamic
    GFP_DMA allocation instead.
    
    The sclp_early_sccb buffer needs special handling, as it can be used
    very early, and by both the decompressor and also the decompressed
    kernel. Therefore, a fixed 4 KB buffer is introduced at 0x11000, the
    former PARMAREA_END. The new PARMAREA_END is now 0x12000, and it is
    renamed to HEAD_END, as it is rather the end of head.S and not the end
    of the parmarea.
    Signed-off-by: default avatarGerald Schaefer <gerald.schaefer@de.ibm.com>
    Reviewed-by: default avatarPhilipp Rudo <prudo@linux.ibm.com>
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
    087c4d74
sclp_sdias.c 6.71 KB