Merge branch 'master' of ssh://git.libre-riscv.org:922/rv32

[rv32.git] / cpudefs.py

diff --git a/cpudefs.py b/cpudefs.py
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+"""
+/*
+ * Copyright 2018 Jacob Lifshay
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+"""
+
+from migen import Constant
+fetch_action = 3
+
+class FA:
+    """ Fetch action constants
+    """
+    default = Constant(0x0, fetch_action)
+    fence = Constant(0x1, fetch_action)
+    jump = Constant(0x2, fetch_action)
+    wait = Constant(0x3, fetch_action)
+    error_trap = Constant(0x4, fetch_action)
+    noerror_trap = Constant(0x5, fetch_action)
+    ack_trap = Constant(0x6, fetch_action)
+
+fetch_output_state = 2
+
+class FOS:
+    """ Fetch output state constants
+    """
+    empty = Constant(0x0, fetch_output_state)
+    valid = Constant(0x1, fetch_output_state)
+    trap = Constant(0x2, fetch_output_state)
+
+decode_action = 12
+
+class DA:
+    """ Decode action constants
+    """
+    trap_illegal_instruction = Constant(0x1, decode_action)
+    load = Constant(0x2, decode_action)
+    fence = Constant(0x4, decode_action)
+    fence_i = Constant(0x8, decode_action)
+    op_op_imm = Constant(0x10, decode_action)
+    lui_auipc = Constant(0x20, decode_action)
+    store = Constant(0x40, decode_action)
+    branch = Constant(0x80, decode_action)
+    jalr = Constant(0x100, decode_action)
+    jal = Constant(0x200, decode_action)
+    trap_ecall_ebreak = Constant(0x400, decode_action)
+    csr = Constant(0x800, decode_action)