From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 15 Dec 2021 15:49:45 +0000 (+0000)
Subject: read MSR.PR and MSR.DR and update ICache priv/virt moed during fetch
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5846e6bef50d185eb4d2a25f18642d78c09c613b;p=soc.git

read MSR.PR and MSR.DR and update ICache priv/virt moed during fetch
---

diff --git a/src/soc/simple/inorder.py b/src/soc/simple/inorder.py
index 60676676..b6cfbcbf 100644
--- a/src/soc/simple/inorder.py
+++ b/src/soc/simple/inorder.py
@@ -24,6 +24,7 @@ import sys
 from nmutil.singlepipe import ControlBase
 from soc.simple.core_data import FetchOutput, FetchInput
 
+from openpower.consts import MSR
 from openpower.decoder.power_enums import MicrOp
 from openpower.state import CoreState
 from soc.regfile.regfiles import StateRegs
@@ -112,6 +113,11 @@ class FetchFSM(ControlBase):
             fetch_failed = Const(0, 1)
             flush_needed = False
 
+        # set priv / virt mode on I-Cache, sigh
+        if isinstance(self.imem, ICache):
+            comb += self.imem.i_in.priv_mode.eq(~msr[MSR.PR])
+            comb += self.imem.i_in.virt_mode.eq(msr[MSR.DR])
+
         with m.FSM(name='fetch_fsm'):
 
             # waiting (zzz)
diff --git a/src/soc/simple/issuer.py b/src/soc/simple/issuer.py
index 0b42aaa3..1ddb2385 100644
--- a/src/soc/simple/issuer.py
+++ b/src/soc/simple/issuer.py
@@ -33,7 +33,7 @@ from openpower.decoder.decode2execute1 import Data
 from openpower.decoder.power_enums import (MicrOp, SVP64PredInt, SVP64PredCR,
                                            SVP64PredMode)
 from openpower.state import CoreState
-from openpower.consts import (CR, SVP64CROffs)
+from openpower.consts import (CR, SVP64CROffs, MSR)
 from soc.experiment.testmem import TestMemory  # test only for instructions
 from soc.regfile.regfiles import StateRegs, FastRegs
 from soc.simple.core import NonProductionCore
@@ -688,6 +688,11 @@ class FetchFSM(ControlBase):
             fetch_failed = Const(0, 1)
             flush_needed = False
 
+        # set priv / virt mode on I-Cache, sigh
+        if isinstance(self.imem, ICache):
+            comb += self.imem.i_in.priv_mode.eq(~msr[MSR.PR])
+            comb += self.imem.i_in.virt_mode.eq(msr[MSR.DR])
+
         with m.FSM(name='fetch_fsm'):
 
             # waiting (zzz)
@@ -702,6 +707,7 @@ class FetchFSM(ControlBase):
                     comb += self.imem.a_pc_i.eq(pc)
                     comb += self.imem.a_i_valid.eq(1)
                     comb += self.imem.f_i_valid.eq(1)
+                    # transfer state to output
                     sync += cur_state.pc.eq(pc)
                     sync += cur_state.svstate.eq(svstate)  # and svstate
                     sync += cur_state.msr.eq(msr)  # and msr