• Paul Mackerras's avatar
    [POWERPC] Support ibm,dynamic-reconfiguration-memory nodes · 0204568a
    Paul Mackerras authored
    For PAPR partitions with large amounts of memory, the firmware has an
    alternative, more compact representation for the information about the
    memory in the partition and its NUMA associativity information.  This
    adds the code to the kernel to parse this alternative representation.
    
    The other part of this patch is telling the firmware that we can
    handle the alternative representation.  There is however a subtlety
    here, because the firmware will invoke a reboot if the memory
    representation we request is different from the representation that
    firmware is currently using.  This is because firmware can't change
    the representation on the fly.  Further, some firmware versions used
    on POWER5+ machines have a bug where this reboot leaves the machine
    with an altered value of load-base, which will prevent any kernel
    booting until it is reset to the normal value (0x4000).  Because of
    this bug, we do NOT set fake_elf.rpanote.new_mem_def = 1, and thus we
    do not request the new representation on POWER5+ and earlier machines.
    We do request the new representation on POWER6, which uses the
    ibm,client-architecture-support call.
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    0204568a
prom_init.c 62.7 KB