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It's difficult to have a uniform view of the stack when transition
modes, so pass the return address in a register. As a result, the
transition functions only access memory via the %cs selector now.
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Implement -ffunction-sections and -fdata-sections in both 32bit and
16bit code.
Make sure all sections have unique names (even asm and discarded
sections).
Enhance tools/layoutrom.py script to find all sections reachable from
exported 16bit code - prune all other sections.
Mark sections with "export" if they can be visible outside of code -
these sections wont be dropped when pruning unused sections.
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Save/restore %ebp on irq entry.
Support saving and restoring %ebp on call16.
Enable display of %ebp in register dumps.
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The irq entry points now push the handler address and jump to a
function that does parameter setup. This reduces the code size
because the entry setup isn't repeated for every handler.
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This allows the entry macros to be used in other assembler code.
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