Implement `setup_mm` for MPU systems. This variant does not require
setting up a direct map.

To reduce code duplication the common initalisation code for both MPU
and MMU Arm64 configurations is refactored into `setup_mm`. Platform-specific
setup steps are now handled by a new helper function `setup_mm_helper`.

Harry Ramsey (3):
  arm/mpu: Implement setup_mm for MPU systems
  arm/mpu: Implement reference counting for inclusive regions
  arm/mpu: Implement ioremap_attr for MPU

 xen/arch/arm/arm32/asm-offsets.c         |   2 +
 xen/arch/arm/arm64/asm-offsets.c         |   2 +
 xen/arch/arm/arm64/mmu/mm.c              |  26 +-----
 xen/arch/arm/include/asm/arm32/mpu.h     |   2 +
 xen/arch/arm/include/asm/arm64/mpu.h     |   2 +
 xen/arch/arm/include/asm/mm.h            |   2 +
 xen/arch/arm/include/asm/mpu/regions.inc |  11 ++-
 xen/arch/arm/mm.c                        |  45 +++++++++
 xen/arch/arm/mpu/mm.c                    | 112 +++++++++++++++++++----
 9 files changed, 159 insertions(+), 45 deletions(-)

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2.43.0