• Soby Mathew's avatar
    Introduce PSCI Library Interface · cf0b1492
    Soby Mathew authored
    This patch introduces the PSCI Library interface. The major changes
    introduced are as follows:
    
    * Earlier BL31 was responsible for Architectural initialization during cold
    boot via bl31_arch_setup() whereas PSCI was responsible for the same during
    warm boot. This functionality is now consolidated by the PSCI library
    and it does Architectural initialization via psci_arch_setup() during both
    cold and warm boots.
    
    * Earlier the warm boot entry point was always `psci_entrypoint()`. This was
    not flexible enough as a library interface. Now PSCI expects the runtime
    firmware to provide the entry point via `psci_setup()`. A new function
    `bl31_warm_entrypoint` is introduced in BL31 and the previous
    `psci_entrypoint()` is deprecated.
    
    * The `smc_helpers.h` is reorganized to separate the SMC Calling Convention
    defines from the Trusted Firmware SMC helpers. The former is now in a new
    header file `smcc.h` and the SMC helpers are moved to Architecture specific
    header.
    
    * The CPU context is used by PSCI for context initialization and
    restoration after power down (PSCI Context). It is also used by BL31 for SMC
    handling and context management during Normal-Secure world switch (SMC
    Context). The `psci_smc_handler()` interface is redefined to not use SMC
    helper macros thus enabling to decouple the PSCI context from EL3 runtime
    firmware SMC context. This enables PSCI to be integrated with other runtime
    firmware using a different SMC context.
    
    NOTE: With this patch the architectural setup done in `bl31_arch_setup()`
    is done as part of `psci_setup()` and hence `bl31_platform_setup()` will be
    invoked prior to architectural setup. It is highly unlikely that the platform
    setup will depend on architectural setup and cause any failure. Please be
    be aware of this change in sequence.
    
    Change-Id: I7f497a08d33be234bbb822c28146250cb20dab73
    cf0b1492
bl31.mk 2.22 KB
#
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include lib/psci/psci_lib.mk

BL31_SOURCES		+=	bl31/bl31_main.c				\
				bl31/interrupt_mgmt.c				\
				bl31/aarch64/bl31_entrypoint.S			\
				bl31/aarch64/runtime_exceptions.S		\
				bl31/aarch64/crash_reporting.S			\
				bl31/bl31_context_mgmt.c			\
				common/runtime_svc.c				\
				services/std_svc/std_svc_setup.c		\
				${PSCI_LIB_SOURCES}

ifeq (${ENABLE_PMF}, 1)
BL31_SOURCES		+=	lib/pmf/pmf_main.c
endif

BL31_LINKERFILE		:=	bl31/bl31.ld.S

# Flag used to indicate if Crash reporting via console should be included
# in BL31. This defaults to being present in DEBUG builds only
ifndef CRASH_REPORTING
CRASH_REPORTING		:=	$(DEBUG)
endif

$(eval $(call assert_boolean,CRASH_REPORTING))
$(eval $(call add_define,CRASH_REPORTING))