dev-arm, configs: Using _on_chip_memory for on chip memory

This patch is pulling the on-chip memory outside of the on_chip_devices
list.
The external interface will be more or less the same: configuration
scripts will still use the attachOnChipIO method; a new kw argument has
been added in order to store mem_ports.

We want to provide to on-chip memory the same mechanism used when
collecting on-chip dma ports. This is needed when using Ruby, since
we need to pass a non None mem_ports to prevent the bootmem to be
wired to the bus.

Change-Id: Ifc519c3072dc5de1530772c70c80dc2094e2c54c
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22000
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs/common/FSConfig.py

@@ -365,7 +365,9 @@ def makeArmSystem(mem_mode, machine_type, num_cpus=1, mdesc=None,
         self.realview.attachIO(self.iobus)
     elif ruby:
         self._dma_ports = [ ]
-        self.realview.attachOnChipIO(self.iobus, dma_ports=self._dma_ports)
+        self._mem_ports = [ ]
+        self.realview.attachOnChipIO(self.iobus,
+            dma_ports=self._dma_ports, mem_ports=self._mem_ports)
         self.realview.attachIO(self.iobus, dma_ports=self._dma_ports)
     else:
         self.realview.attachOnChipIO(self.membus, self.bridge)

src/dev/arm/RealView.py

@@ -550,9 +550,14 @@ class RealView(Platform):
 
     _off_chip_ranges = []
 
+    def _attach_memory(self, mem, bus, mem_ports=None):
+        if hasattr(mem, "port"):
+            if mem_ports is None:
+                mem.port = bus.master
+            else:
+                mem_ports.append(mem.port)
+
     def _attach_device(self, device, bus, dma_ports=None):
-        if hasattr(device, "port"):
-            device.port = bus.master
         if hasattr(device, "pio"):
             device.pio = bus.master
         if hasattr(device, "dma"):
@@ -565,6 +570,10 @@ class RealView(Platform):
         for d in devices:
             self._attach_device(d, *args, **kwargs)
 
+    def _attach_mem(self, memories, *args, **kwargs):
+        for mem in memories:
+            self._attach_memory(mem, *args, **kwargs)
+
     def _attach_clk(self, devices, clkdomain):
         for d in devices:
             if hasattr(d, "clk_domain"):
@@ -582,8 +591,9 @@ class RealView(Platform):
     def offChipIOClkDomain(self, clkdomain):
         self._attach_clk(self._off_chip_devices(), clkdomain)
 
-    def attachOnChipIO(self, bus, bridge=None, *args, **kwargs):
-        self._attach_io(self._on_chip_devices(), bus, *args, **kwargs)
+    def attachOnChipIO(self, bus, bridge=None, dma_ports=None, mem_ports=None):
+        self._attach_mem(self._on_chip_memory(), bus, mem_ports)
+        self._attach_io(self._on_chip_devices(), bus, dma_ports)
         if bridge:
             bridge.ranges = self._off_chip_ranges
 
@@ -643,7 +653,6 @@ class VExpress_EMM(RealView):
     def _on_chip_devices(self):
         devices = [
             self.gic, self.vgic,
-            self.bootmem,
             self.local_cpu_timer
         ]
         if hasattr(self, "gicv2m"):
@@ -651,6 +660,12 @@ class VExpress_EMM(RealView):
         devices.append(self.hdlcd)
         return devices
 
+    def _on_chip_memory(self):
+        memories = [
+            self.bootmem,
+        ]
+        return memories
+
     ### Off-chip devices ###
     uart = Pl011(pio_addr=0x1c090000, int_num=37)
     pci_host = GenericPciHost(
@@ -882,8 +897,13 @@ Interrupts:
     def _on_chip_devices(self):
         return [
             self.generic_timer,
+        ]
+
+    def _on_chip_memory(self):
+        memories = [
             self.bootmem,
         ]
+        return memories
 
     ### Off-chip devices ###
     clock24MHz = SrcClockDomain(clock="24MHz",