PCI-ISA bridge callback mechanism to attach the ISA bus to the PCI=ISA
bridge.
This is basically an import of the i386 pcib.c code with very minor
changes.
Modify current_spl_level to reflect the temporary change in interrupt
priority level which dispatching.
Don't increment the interrupt stats for every handler in the interrupt chain.
Cleaned up a number of comments.
Define soft interrupt names.
A few miscellaneous tidy ups.
Removed any remnants of soft interrupt dispatching.
Cleaned up a number of comments.
Removed a number of blank lines.
Nuked register keywords.
Made sure code is in sync with interrupt handling for other ARM hardware.
Update set_spl_masks() to reflect the _SPL_SOFT* macros.
Initialise the soft interrupt mask array.
Update dump_spl_masks() to dump all the hardware and software spl masks.
with the spl_smasks array and the current_spl_level variable to work
out which soft interrupts are pending.
This means that soft interrupts are now separated from the hardware
interrupts so a full 32 hardware and 32 software interrupts can now be
supported.
Implement clearsoftintr() function.
Define several macros to make the soft interrupt dispatching code cleaner.
Implement setsoftserial() function.
Implement soft serial interrupt dispatching.
Remove all soft interrupt definitions now soft interrupts are being
separated from hardware ones.
Reserved interrupts do not have any special uses so only define then if
needed as placeholders.
appropriate spl* macros.
Move spllpt() maro here from intr.h
Prototype setsoftserial().
Define spl_smasks array for software interrupt masks to complement the
hardware interrupt masks.
the kernel page tables. map_chunk() replaces running a loop, calling
map_entry() and in addition where possible it will use L1 section mappings
or L2 large page mappings instead of L2 small page mappings in order to
reduce the TLB entried needed for the kernel.
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