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In combination with the PPC_EXC_CONFIG_USE_FIXED_HANDLER option this
removes all dependencies on valid read-write data. The exception
handling must be statically configured and all components reside in
read-only sections.
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In case a BSP enables this option, then fixed high level exception
handler will be used. For normal asynchronous exceptions this is
bsp_interrupt_dispatch() and for other exceptions this is the handler
from the read-only ppc_exc_handler_table. The global handler is
C_exception_handler(). This avoids some dependencies on valid
read-write data.
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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.
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* mpc5xx/exceptions/raw_exception.c, mpc5xx/exceptions/raw_exception.h,
mpc5xx/include/console.h, mpc5xx/include/mpc5xx.h, mpc5xx/irq/irq.c,
mpc5xx/irq/irq.h, mpc5xx/irq/irq_asm.S, mpc5xx/vectors/vectors.h,
mpc5xx/vectors/vectors_init.c, mpc6xx/mmu/bat.c, mpc6xx/mmu/bat.h,
mpc6xx/mmu/mmuAsm.S, new-exceptions/bspsupport/irq.c,
new-exceptions/bspsupport/irq_supp.h,
new-exceptions/bspsupport/nested_irq_test.c,
new-exceptions/bspsupport/ppc_exc_address.c,
new-exceptions/bspsupport/ppc_exc_categories.c,
new-exceptions/bspsupport/ppc_exc_global_handler.c,
new-exceptions/bspsupport/ppc_exc_hdl.c,
new-exceptions/bspsupport/ppc_exc_initialize.c,
new-exceptions/bspsupport/ppc_exc_prologue.c,
new-exceptions/bspsupport/ppc_exc_test.c,
new-exceptions/bspsupport/vectors.h, shared/include/byteorder.h,
shared/include/cpuIdent.c, shared/include/cpuIdent.h,
shared/include/io.h, shared/include/mmu.h, shared/include/page.h,
shared/include/pgtable.h, shared/include/spr.h: Fix typo where
license said found in found in.
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PR 1599/cpukit
* new-exceptions/bspsupport/ppc_exc_hdl.c: Rename
_Context_Switch_necessary to _Thread_Dispatch_necessary to more
properly reflect the intent.
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PR 1573/cpukit
* mpc5xx/irq/irq.c, mpc5xx/irq/irq_asm.S,
new-exceptions/bspsupport/ppc_exc.S,
new-exceptions/bspsupport/ppc_exc_asm_macros.h,
new-exceptions/bspsupport/ppc_exc_hdl.c: 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.
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* new-exceptions/bspsupport/ppc_exc_asm_macros.S,
new-exceptions/bspsupport/ppc_exc_bspsupp.h,
new-exceptions/bspsupport/ppc_exc_hdl.c,
new-exceptions/bspsupport/vectors_init.c:
fixed and enabled stack-switching algorithm which figures out
if we already run on the ISR stack rather than relying on the
_ISR_Nest_level.
Added 'ppc_exc_crit_always_enabled' variable which defines
the semantics of critical interrupts. Added a test to
TEST_LOCK_crit so that calling ppc_exc_wrapup() (and
possibly the dispatcher) is always skipped if the BSP/user
wants to leave critical interrupts always enabled (at the
expense of having no OS support).
changed TEST_LOCK_mchk so that asynchronous machine-check
handlers never call ppc_exc_wrapup() (and the dispatcher).
We don't want to disable MSR_ME ever (to avoid checkstops)
and hence asynchronous MEs must not use OS services anyways.
added and commented new variables 'ppc_exc_intr_stack_size'
'ppc_exc_crit_always_enabled'.
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* new-exceptions/bspsupport/ppc_exc_asm_macros.h,
new-exceptions/bspsupport/ppc_exc.S,
new-exceptions/bspsupport/README,
new-exceptions/bspsupport/ppc_exc_hdl.c:
Thomas Doerfler clarified (thanks!) that raising an
exception and executing the 1st instruction is not
an atomical operation. I added a fix to the code that
checks if a lower-priority interrupt is under way:
we now not only test if the 'lock' variable was set
but also check if the interrupted PC points to the
'write lock' instruction.
Added more comments and updated README.
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* new-exceptions/bspsupport/ppc_exc_hdl.c: make sure
RI is set in the exception frame and panic if it isn't
(state info might have been lost). This only affects
classic PPC.
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* new-exceptions/bspsupport/irq.c,
new-exceptions/bspsupport/ppc_exc_bspsupp.h,
new-exceptions/bspsupport/ppc_exc_hdl.c:
fixed some mismatching signed/unsigned types.
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* new-exceptions/bspsupport/, new-exceptions/bspsupport/ppc_exc.S,
new-exceptions/bspsupport/ppc_exc_test.c,
new-exceptions/bspsupport/vectors.h,
new-exceptions/bspsupport/vectors_init.c,
new-exceptions/bspsupport/irq.c,
new-exceptions/bspsupport/ppc_exc_bspsupp.h,
new-exceptions/bspsupport/ppc_exc_hdl.c,
new-exceptions/bspsupport/ppc_exc_asm_macros.h,
new-exceptions/bspsupport/nested_irq_test.c:
New files. Added 'middleware' code for helping BSPs implement
exception and interrupt handling and implementing the 'new'
RTEMS IRQ API (which I personally dislike).
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