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