• Jonathan Austin's avatar
    ARM: mpu: add MPU initialisation for secondary cores · eb08375e
    Jonathan Austin authored
    The MPU initialisation on the primary core is performed in two stages, one
    minimal stage to ensure the CPU can boot and a second one after
    sanity_check_meminfo. As the memory configuration is known by the time we
    boot secondary cores only a single step is necessary, provided the values
    for DRSR are passed to secondaries.
    
    This patch implements this arrangement. The configuration generated for the
    MPU regions is made available to the secondary core, which can then use the
    asm MPU intialisation code to program a complete region configuration.
    
    This is necessary for SMP configurations without an MMU, as the MPU
    initialisation is the only way to ensure that memory is specified as
    'shared'.
    Signed-off-by: default avatarJonathan Austin <jonathan.austin@arm.com>
    Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
    CC: Nicolas Pitre <nico@linaro.org>
    eb08375e
head-nommu.S 6.82 KB