arch-arm,cpu: Add initial support for Arm SVE

This changeset adds initial support for the Arm Scalable Vector Extension
(SVE) by implementing:
- support for most data-processing instructions (no loads/stores yet);
- basic system-level support.

Additional authors:
- Javier Setoain <javier.setoain@arm.com>
- Gabor Dozsa <gabor.dozsa@arm.com>
- Giacomo Travaglini <giacomo.travaglini@arm.com>

Thanks to Pau Cabre for his contribution of bugfixes.

Change-Id: I1808b5ff55b401777eeb9b99c9a1129e0d527709
Signed-off-by: Giacomo Gabrielli <giacomo.gabrielli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/13515
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/util/cpt_upgraders/arm-sve.py b/util/cpt_upgraders/arm-sve.py
new file mode 100644
index 000000000..53fab7fd9
--- /dev/null
+++ b/util/cpt_upgraders/arm-sve.py
@@ -0,0 +1,37 @@
+def upgrader(cpt):
+    """
+    Update the checkpoint to support initial SVE implemtation.
+    The updater is taking the following steps.
+
+    1) Set isa.haveSVE to false
+    2) Set isa.sveVL to 1
+    3) Add SVE misc registers in the checkpoint
+    """
+    if cpt.get('root','isa') == 'arm':
+        for sec in cpt.sections():
+            import re
+            # Search for all ISA sections
+            if re.search('.*sys.*\.cpu.*\.isa$', sec):
+
+                # haveSVE = false
+                cpt.set(sec, 'haveSVE', 'false')
+
+                # sveVL (sve Vector Length in quadword) = 1
+                # (This is a dummy value since haveSVE is set to false)
+                cpt.set(sec, 'sveVL', '1')
+
+                # Updating SVE misc registers (dummy values)
+                mr = cpt.get(sec, 'miscRegs').split()
+                if len(mr) == 820:
+                    print "MISCREG_SVE registers already seems to be inserted."
+                else:
+                    # Replace MISCREG_FREESLOT_1 with MISCREG_ID_AA64ZFR0_EL1
+                    mr[-1] = 0;
+
+                    mr.append(0); # Add dummy value for MISCREG_ZCR_EL3
+                    mr.append(0); # Add dummy value for MISCREG_ZCR_EL2
+                    mr.append(0); # Add dummy value for MISCREG_ZCR_EL12
+                    mr.append(0); # Add dummy value for MISCREG_ZCR_EL1
+                    cpt.set(sec, 'miscRegs', ' '.join(str(x) for x in mr))
+
+legacy_version = 15