Chris January has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/31078 )
Change subject: fastmodel: Implement GIC DTB auto-generation.
......................................................................
fastmodel: Implement GIC DTB auto-generation.
Implement generateDeviceTree for FastModelGIC so the interrupt
controller is automatically added to the DTB. This is sufficient to
allow a VExpressFastmodel system model to boot Linux without an
explicit DTB.
Change-Id: I69d86fd8bba1b86768c8a118d2de079a56179854
---
M src/arch/arm/fastmodel/GIC/FastModelGIC.py
1 file changed, 74 insertions(+), 0 deletions(-)
diff --git a/src/arch/arm/fastmodel/GIC/FastModelGIC.py
b/src/arch/arm/fastmodel/GIC/FastModelGIC.py
index d682e85..c1f9b72 100644
--- a/src/arch/arm/fastmodel/GIC/FastModelGIC.py
+++ b/src/arch/arm/fastmodel/GIC/FastModelGIC.py
@@ -1,3 +1,15 @@
+# Copyright (c) 2020 ARM Limited
+# All rights reserved
+#
+# The license below extends only to copyright in the software and shall
+# not be construed as granting a license to any other intellectual
+# property including but not limited to intellectual property relating
+# to a hardware implementation of the functionality of the software
+# licensed hereunder. You may use the software subject to the license
+# terms below provided that you ensure that this notice is replicated
+# unmodified and in its entirety in all distributions of the software,
+# modified or unmodified, in source code or in binary form.
+#
# Copyright 2019 Google, Inc.
#
# Redistribution and use in source and binary forms, with or without
@@ -24,6 +36,7 @@
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from m5.params import *
+from m5.util.fdthelper import *
from m5.SimObject import SimObject
from m5.objects.FastModel import AmbaInitiatorSocket, AmbaTargetSocket
@@ -463,6 +476,9 @@
redistributor = VectorGicv3CommsInitiatorSocket(
'GIC communication initiator')
+ # Used for DTB autogeneration
+ _state = FdtState(addr_cells=2, size_cells=2, interrupt_cells=3)
+
def get_redist_bases(self):
"""
The format of reg_base_per_redistributor is
@@ -497,3 +513,61 @@
]
return ranges
+
+ def interruptCells(self, int_type, int_num, int_flag):
+ """
+ Interupt cells generation helper:
+ Following specifications described in
+
+
Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt
+ """
+ prop = self._state.interruptCells(0)
+ assert len(prop) >= 3
+ prop[0] = int_type
+ prop[1] = int_num
+ prop[2] = int_flag
+ return prop
+
+ def generateDeviceTree(self, state):
+ sc_gic = self.sc_gic
+
+ node = FdtNode("interrupt-controller")
+ node.appendCompatible(["arm,gic-v3"])
+ node.append(self._state.interruptCellsProperty())
+ node.append(self._state.addrCellsProperty())
+ node.append(self._state.sizeCellsProperty())
+ node.append(FdtProperty("ranges"))
+ node.append(FdtProperty("interrupt-controller"))
+
+ redist_stride = 0x40000 if sc_gic.has_gicv4_1 else 0x20000
+ node.append(FdtPropertyWords("redistributor-stride",
+ state.sizeCells(redist_stride)))
+
+ regs = (
+ state.addrCells(sc_gic.reg_base) +
+ state.sizeCells(0x10000) +
+ state.addrCells(self.get_redist_bases()[0]) +
+ state.sizeCells(0x2000000) )
+
+ node.append(FdtPropertyWords("reg", regs))
+ node.append(FdtPropertyWords("interrupts",
+ self.interruptCells(1, 9, 0xf04)))
+
+ node.appendPhandle(self)
+
+ # Generate the ITS device tree
+ gic_frame_size = 0x10000
+ its_bases = [
+ sc_gic.its0_base, sc_gic.its1_base, sc_gic.its2_base,
+ sc_gic.its3_base
+ ]
+ for its_base in its_bases:
+ its_node = self.generateBasicPioDeviceNode(state, "gic-its",
+ its_base,
+ 2 * gic_frame_size)
+ its_node.appendCompatible(["arm,gic-v3-its"])
+ its_node.append(FdtProperty("msi-controller"))
+ its_node.append(FdtPropertyWords("#msi-cells", [1]))
+ node.append(its_node)
+
+ yield node
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I69d86fd8bba1b86768c8a118d2de079a56179854
Gerrit-Change-Number: 31078
Gerrit-PatchSet: 1
Gerrit-Owner: Chris January <chris.janu...@arm.com>
Gerrit-MessageType: newchange
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