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constants.py
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constants.py
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from enum import Enum
############################################################
# Default file extension.
ASSEMBLY_FILE_EXTENSION = '.asm'
DEFAULT_FILE_EXTENSION = '.mem'
############################################################
# Width and size of ROM
ROM_ADDR_WIDTH = 8
ROM_SIZE = 2 ** ROM_ADDR_WIDTH
############################################################
# Width and size of RAM
RAM_ADDR_WIDTH = 7
RAM_SIZE = 2 ** RAM_ADDR_WIDTH
############################################################
# Base addresses
MOUSE_BASE_ADDR = int('0xA0', base=16)
LEDS_BASE_ADDR = int('0xC0', base=16)
SEG7_BASE_ADDR = int('0xD0', base=16)
SWITCH_BASE_ADDR = int('0xE0', base=16)
############################################################
# ALU op-codes
ALU_OPS = Enum('ALU_OPS',
names=['ADD',
'SUB',
'MUL',
'SL_A',
'SR_A',
'INC_A',
'INC_B',
'DEC_A',
'DEC_B',
'EQ',
'GT',
'LT',
'AND',
'OR',
'XOR',
'NOT_A',
'OUT_A'],
start=0,
type=int)
ALU_OPS_COMMENTS = {
ALU_OPS.ADD : 'A + B',
ALU_OPS.SUB : 'A - B',
ALU_OPS.MUL : 'A * B',
ALU_OPS.SL_A : 'A << 1',
ALU_OPS.SR_A : 'A >> 1',
ALU_OPS.INC_A : 'A + 1',
ALU_OPS.INC_B : 'B + 1',
ALU_OPS.DEC_A : 'A - 1',
ALU_OPS.DEC_B : 'B - 1',
ALU_OPS.EQ: 'A == B',
ALU_OPS.GT : 'A > B',
ALU_OPS.LT : 'A < B',
ALU_OPS.AND : 'A AND B',
ALU_OPS.OR : 'A OR B',
ALU_OPS.XOR : 'A XOR B',
ALU_OPS.NOT_A : 'NOT A',
ALU_OPS.OUT_A : 'A'
}
############################################################
# Conditional branch types
BRANCH_TYPES = Enum('BRANCH_TYPES',
names=['EQ', 'GT', 'LT'],
start=9,
type=int)
############################################################
# Instruction codes
INST = Enum('INST',
names=['READ_MEM_TO_A',
'READ_MEM_TO_B',
'WRITE_A_TO_MEM',
'WRITE_B_TO_MEM',
'ALU_OP_TO_A',
'ALU_OP_TO_B',
'BRANCH',
'GOTO',
'GOTO_IDLE',
'FUNC_CALL',
'RETURN',
'DEREF_A',
'DEREF_B'],
start=0,
type=int)
############################################################
# Assembly tokens supported by the assembler
TOKENS = Enum('TOKENS',
names=[
'LB',
'SB',
'ADD',
'SUB',
'MUL',
'SLA',
'SRA',
'INC',
'DEC',
'SEQ',
'SGT',
'SLT',
'AND',
'OR',
'XOR',
'NOT',
'COPY',
'BEQ',
'BGT',
'BLT',
'JUMP',
'IDLE',
'FUNC',
'RETURN',
'DEREF'],
type=str)
# Registers used by the processor
REGISTERS = Enum('REGISTERS', names=['A', 'B'], type=str)
############################################################
# Instruction type mapping
# Memory operation, e.g. <TOKEN> {A, B} <ADDRESS>
S_ARG_COUNT = 2
S_TYPE = {TOKENS.LB.name,
TOKENS.SB.name}
# Simple register operation, e.g. <TOKEN> {A, B}
R_ARG_COUNT = 1
R_TYPE = {TOKENS.ADD.name,
TOKENS.SUB.name,
TOKENS.MUL.name,
TOKENS.SLA.name,
TOKENS.SRA.name,
TOKENS.SEQ.name,
TOKENS.SGT.name,
TOKENS.SLT.name,
TOKENS.AND.name,
TOKENS.OR.name,
TOKENS.XOR.name,
TOKENS.NOT.name,
TOKENS.COPY.name,
TOKENS.DEREF.name}
# Complex register operation, e.g. <TOKEN> {A, B} {A, B}
RR_ARG_COUNT = 2
RR_TYPE = {TOKENS.INC.name,
TOKENS.DEC.name}
# Branch like operation, e.g. <TOKEN> <LABEL>
B_ARG_COUNT = 1
B_TYPE = {TOKENS.BEQ.name,
TOKENS.BGT.name,
TOKENS.BLT.name,
TOKENS.JUMP.name,
TOKENS.FUNC.name}
# Direct operation, e.g. <TOKEN> (no additional operand)
D_ARG_COUNT = 0
D_TYPE = {TOKENS.IDLE.name,
TOKENS.RETURN.name}
############################################################
# Interrupt call labels
MOUSE_INTERRUPT = 'MOUSE'
TIMER_INTERRUPT = 'TIMER'
# Interrupt addresses
MOUSE_INTERRUPT_ADDR = int('FF', base=16)
TIMER_INTERRUPT_ADDR = int('FE', base=16)