• Jordan Niethe's avatar
    powerpc: Use a datatype for instructions · 94afd069
    Jordan Niethe authored
    Currently unsigned ints are used to represent instructions on powerpc.
    This has worked well as instructions have always been 4 byte words.
    
    However, ISA v3.1 introduces some changes to instructions that mean
    this scheme will no longer work as well. This change is Prefixed
    Instructions. A prefixed instruction is made up of a word prefix
    followed by a word suffix to make an 8 byte double word instruction.
    No matter the endianness of the system the prefix always comes first.
    Prefixed instructions are only planned for powerpc64.
    
    Introduce a ppc_inst type to represent both prefixed and word
    instructions on powerpc64 while keeping it possible to exclusively
    have word instructions on powerpc32.
    Signed-off-by: default avatarJordan Niethe <jniethe5@gmail.com>
    [mpe: Fix compile error in emulate_spe()]
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    Link: https://lore.kernel.org/r/20200506034050.24806-12-jniethe5@gmail.com
    94afd069
mpc86xx_smp.c 2.44 KB