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Update the layoutrom.py build script so that fixed address sections
can come from the 32bit compiled C code. Update the C code so that
all VAR16FIXED variables instead use the new VARFSEGFIXED which is
defined in 32bit mode.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Define macro VAR16FIXED for declaring a variable at a fixed location.
Introduce new file src/misc.c, and move non int15 calls from system.c
to it.
Implement all fixed location variables in C code.
Move IDT/GDT defs to misc.c. Remove unused gdt entry 1.
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Rename VAR16 to VAR16_32 -- that macro supports accesses from both
16bit and 32bit mode.
Introduce a new macro VAR16 that must be present on all global
variables accessed from 16bit mode.
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The BIOS_CONFIG_TABLE must be aligned to 1 (or gcc may change it).
Consistently use __aligned(x) wrapper throughout C code.
Register the official fixed address handlers - even if it is only a
jump to the real handler.
Declare .type of data objects - it improves disassembler output.
Put labels at all fixed addresses - it improves disassembler output.
entry_hwirq should be calling 'cli' - use regular entry macro.
int1D is a data table, not code - so don't put an iretw there.
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