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This patch is a part of the BSP source reorganization.
Update #3285.
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Change bsp_interrupt_vector_enable() and bsp_interrupt_vector_disable()
to not return a status code. Add bsp_interrupt_assert() and use it to
validate the vector number in the vector enable/disable implementations.
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The BSP support is divided to startup/bspsmp_api.c file where
functions required by SuperCore are defined and BCM2836 hardware
initialization part in startup/bspsmp_init.c.
Separation is done to prevent smpfatal08 test build failure.
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based approach.
Using conditional branches to find bits is extremely inefficient
and for asynchronous delivery of different interrupt sources
lead to total confusion of branch prediction unit.
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exception table.
Exception table setup is processed by common CPU architecture support.
For ARM architecture, it can be found in the file
rtems/c/src/lib/libbsp/arm/shared/start/start.S
and ends by bsp_vector_table_copy_done label.
The actual tabel content can be found at
bsp_start_vector_table_begin
For ARMv7-A and even other variant with hypervisor mode support,
it is even not necessary to copy table to address 0 at all
because CP15 register can be used to specify alternative
table start address
arm_cp15_set_vector_base_address(&)bsp_start_vector_table_begin;
ARMv7-M have register to set exception table base as well.
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The current versions of U-boot start kernel/RTEMS application image
with instruction and data caches enabled and it sets exception
base register to new address after its self-relocation.
ldr r0, [r9, #GD_RELOCADDR] /* r0 = gd->relocaddr */
mcr p15, 0, r0, c12, c0, 0 /* Set VBAR */
Included changes in bsp_start_hook_0 restore default state to
allow RTEMS image to run after startup from newer U-boot version
on Raspberry Pi.
Clear interrupt enable registers in interrupt controller
to ensure that RTEMS starts from well defined state.
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Added support for the new RTEMS GPIO API functions.
Test cases can be found in https://github.com/asuol/RTEMS_rpi_testing/tree/master/GPIO
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