Add PSCI support

[Sascha Hauer]

This series implements the ARM "Power State Coordination Interface"
(PSCI). This is needed to enable SMP on some SoCs like the i.MX7 with
a mainline Kernel. Currently only the bare minimum is supported, just
enough to enable and disable the secondary CPU.

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Sascha Hauer (4):
      ARM: Add UNWIND macro
      ARM: Add smc call support
      ARM: Add PSCI support
      ARM: i.MX7: Add PSCI support

 arch/arm/Kconfig                 |  23 +++
 arch/arm/cpu/Makefile            |   3 +
 arch/arm/cpu/psci.c              | 311 +++++++++++++++++++++++++++++++++++++++
 arch/arm/cpu/sm.c                | 266 +++++++++++++++++++++++++++++++++
 arch/arm/cpu/sm_as.S             | 168 +++++++++++++++++++++
 arch/arm/cpu/smccc-call.S        |  64 ++++++++
 arch/arm/include/asm/arm-smccc.h | 104 +++++++++++++
 arch/arm/include/asm/armlinux.h  |   4 +-
 arch/arm/include/asm/gic.h       | 110 ++++++++++++++
 arch/arm/include/asm/psci.h      | 140 ++++++++++++++++++
 arch/arm/include/asm/ptrace.h    |   1 +
 arch/arm/include/asm/secure.h    |  39 +++++
 arch/arm/include/asm/unwind.h    |   6 +
 arch/arm/lib/bootm.c             |  14 +-
 arch/arm/lib32/armlinux.c        |  15 +-
 arch/arm/lib32/barebox.lds.S     |  10 ++
 arch/arm/mach-imx/imx7.c         |  77 ++++++++++
 17 files changed, 1352 insertions(+), 3 deletions(-)
 create mode 100644 arch/arm/cpu/psci.c
 create mode 100644 arch/arm/cpu/sm.c
 create mode 100644 arch/arm/cpu/sm_as.S
 create mode 100644 arch/arm/cpu/smccc-call.S
 create mode 100644 arch/arm/include/asm/arm-smccc.h
 create mode 100644 arch/arm/include/asm/gic.h
 create mode 100644 arch/arm/include/asm/psci.h
 create mode 100644 arch/arm/include/asm/secure.h