PowerPC cores with the SPE (Signal Processing Extension) have 64-bit
general-purpose registers. The SPE context switch code has been merged
with the standard context switch code. The context switch may use cache
operations to increase the performance. It will be ensured that the
context is 32-byte aligned (PPC_DEFAULT_CACHE_LINE_SIZE). This
increases the overall memory size of the context area in the thread
control block slightly. The general-purpose registers GPR2 and GPR13
are no longer part of the context. The BSP must initialize these
registers during startup (usually initialized by the __eabi() function).
The new BSP option BSP_USE_DATA_CACHE_BLOCK_TOUCH can be used to enable
the dcbt instruction in the context switch.
The new BSP option BSP_USE_SYNC_IN_CONTEXT_SWITCH can be used to enable
sync and isync instructions in the context switch. This should be not
necessary in most cases.
Script does what is expected and tries to do it as
smartly as possible.
+ remove occurrences of two blank comment lines
next to each other after Id string line removed.
+ remove entire comment blocks which only exited to
contain CVS Ids
+ If the processing left a blank line at the top of
a file, it was removed.
In particular CPU_INTERRUPT_NUMBER_OF_VECTORS and
CPU_INTERRUPT_MAXIMUM_VECTOR_NUMBER are only used on
Simple Vectored Architectures, so do not depend on
them being defined. This disables as much as possible
that is specific to the Simple Vectored Model and
not expected to be used on architectures which use
the Programmable Interrupt Controller model for
interrupt handler vectoring.
This commit covers at least PR2020, 2022, and 2023. This
patch adds all of the code for both BSPs, modifications
to libcpu/powerpc for the ppc440, and some updates to the
BSPs from follow up review and testing.
These BSPs should be good baselines for future development.
The configurations used by Ric are custom and have a non-standard
NIC. They also do not have a UART. Thus the current console
driver just prints to a RAM buffer.
The NIC and UART support are left for future work. When the UART
support is added, moving the existing "to RAM" console driver to
a shared location is likely desirable because boards with no debug
UART port are commonly deployed. This would let printk() go to RAM.
* rtems/powerpc/registers.h: Renamed defines XER in PPC_XER, LR in
PPC_LR, CTR in PPC_CTR, PVR in PPC_PVR, RPA in PPC_RPA, DAR in
PPC_DAR, DEC in PPC_DEC, and EAR in PPC_EAR.
* rtems/score/cpu.h: Add RTEMS_COMPILER_NO_RETURN_ATTRIBUTE to
_CPU_Context_restore() because it does not return. Telling GCC this
avoids generation of dead code.
PR 1635/cpukit
* rtems/score/cpu.h, rtems/score/types.h: Refactoring of priority
handling, to isolate the bitmap implementation of priorities in the
supercore so that priority management is a little more modular. This
change is in anticipation of scheduler implementations that can
select how they manage tracking priority levels / finding the highest
priority ready task. Note that most of the changes here are simple
renaming, to clarify the use of the bitmap-based priority management.
PR 1573/cpukit
* rtems/new-exceptions/cpu.h: Add a per cpu data structure which
contains the information required by RTEMS for each CPU core. This
encapsulates information such as thread executing, heir, idle and
dispatch needed.
* score/cpu/powerpc/rtems/score/cpu.h: Added space for non-
volatile AltiVec registers to context struct. Added declaration
for AltiVec-related routines to be implemented by CPU/BSP
support.
* rtems/score/cpu.h: Changed fpscr field to an integer type in
Context_Control_fp. Fixed warnings in PPC_Set_timebase_register().
Changed _CPU_Context_Initialize_fp() to initialize all fields and
avoid floating-point instructions.
* rtems/score/powerpc.h: Removed PPC_INIT_FPSCR define.
* rtems/new-exceptions/cpu.h, rtems/score/cpu.h: Eliminate
_CPU_Thread_dispatch_pointer and passing address of _Thread_Dispatch
to _CPU_Initialize. Clean up comments.
* cpukit/score/cpu/powerpc/rtems/new-exceptions/cpu.h,
cpukit/score/cpu/powerpc/rtems/score/cpu.h,
cpukit/score/cpu/powerpc/rtems/score/powerpc.h:
Removed all macro definitions which depended on
the compiler defining a PPC CPU-model dependent
symbol.
Macros which were not used by cpukit have been
moved to libcpu/powerpc/rtems/powerpc/powerpc.h.
