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arch/z80/src/z80
^^^^^^^^^^^^^^^^
The arch/z80 directories contain files to support a variety of 8-bit architectures
from ZiLOG (and spin-architectures such as the Rabbit2000). The arch/z80/src/z80
sub-directory contains logic unique to the classic Z80 chip.
Files in this directory include:
z80_head.asm
This is the main entry point into the Z80 program. This includes the
handler for the RESET, power-up interrupt vector and address zero and all
RST interrupts.
z80_rom.asm
Some architectures may have ROM located at address zero. In this case, a
special version of the "head" logic must be used. This special "head"
file is probably board-specific and, hence, belongs in the board-specific
configs/<board-name>/src directory. This file may, however, be used as
a model for such a board-specific file.
z80_rom.S is enabled by specifying CONFIG_LINKER_ROM_AT_0000 in the
configuration file.
A board specific version in the configs/<board-name>/src directory can be
used by:
1. Define CONFIG_ARCH_HAVEHEAD
2. Add the board-specific head file, say <filename>.asm, to
configs/<board-name>/src
3. Add a file called Make.defs in the configs/<board-name>/src directory
containing the line: HEAD_ASRC = <file-name>.asm
Make.defs
This is the standard makefile fragment that must be provided in all
chip directories. This fragment identifies the chip-specific file to
be used in building libarch.
chip.h
This is the standard header file that must be provided in all chip
directories.
z80_initialstate.c, z80_copystate.c, z80_restoreusercontext.asm, and
z80_saveusercontext.asm, switch
These files implement the Z80 context switching logic
z80_schedulesigaction.c and z80_sigdeliver.c
These files implement Z80 signal handling.
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