• Paul Mackerras's avatar
    powerpc: Free up CPU feature bits on 64-bit machines · 9bbf0b57
    Paul Mackerras authored
    This moves all the CPU feature bits that are only used on 32-bit
    machines to the top 20 bits of the CPU feature word and arranges
    for them to be defined only in 32-bit builds.  The features that
    are common to 32-bit and 64-bit machines are moved to bits 0-11
    of the CPU feature word.  This means that for 64-bit platforms,
    bits 44-63 can now be used for new features that only exist on
    64-bit machines.  (These bit numbers are counting from the right,
    i.e. the LSB is bit 0.)
    
    Because CPU_FTR_L3_DISABLE_NAP moved from the low 16 bits to the high
    16 bits, we have to adjust some assembly code.  Also, CPU_FTR_EMB_HV
    moved from the high 16 bits to the low 16 bits.
    
    Note that CPU_FTR_REAL_LE only applies to 64-bit chips, because only
    64-bit chips (POWER6, 7, 8, 9) have a true little-endian mode that is
    a CPU execution mode as opposed to being a page attribute.
    
    With this we now have 20 free CPU feature bits on 64-bit machines.
    Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    9bbf0b57
cpu_setup_fsl_booke.S 7.22 KB