MEM: Enable multiple distributed generalized memories

This patch removes the assumption on having on single instance of
PhysicalMemory, and enables a distributed memory where the individual
memories in the system are each responsible for a single contiguous
address range.

All memories inherit from an AbstractMemory that encompasses the basic
behaviuor of a random access memory, and provides untimed access
methods. What was previously called PhysicalMemory is now
SimpleMemory, and a subclass of AbstractMemory. All future types of
memory controllers should inherit from AbstractMemory.

To enable e.g. the atomic CPU and RubyPort to access the now
distributed memory, the system has a wrapper class, called
PhysicalMemory that is aware of all the memories in the system and
their associated address ranges. This class thus acts as an
infinitely-fast bus and performs address decoding for these "shortcut"
accesses. Each memory can specify that it should not be part of the
global address map (used e.g. by the functional memories by some
testers). Moreover, each memory can be configured to be reported to
the OS configuration table, useful for populating ATAG structures, and
any potential ACPI tables.

Checkpointing support currently assumes that all memories have the
same size and organisation when creating and resuming from the
checkpoint. A future patch will enable a more flexible
re-organisation.

--HG--
rename : src/mem/PhysicalMemory.py => src/mem/AbstractMemory.py
rename : src/mem/PhysicalMemory.py => src/mem/SimpleMemory.py
rename : src/mem/physical.cc => src/mem/abstract_mem.cc
rename : src/mem/physical.hh => src/mem/abstract_mem.hh
rename : src/mem/physical.cc => src/mem/simple_mem.cc
rename : src/mem/physical.hh => src/mem/simple_mem.hh

1 files changed, 8 insertions, 6 deletions

diff --git a/src/dev/arm/RealView.py b/src/dev/arm/RealView.py
index 4753bf5bf..973a2cd52 100644
--- a/src/dev/arm/RealView.py
+++ b/src/dev/arm/RealView.py
@@ -49,7 +49,7 @@ from Ide import *
 from Platform import Platform
 from Terminal import Terminal
 from Uart import Uart
-from PhysicalMemory import *
+from SimpleMemory import SimpleMemory
 
 class AmbaDevice(BasicPioDevice):
     type = 'AmbaDevice'
@@ -146,10 +146,11 @@ class RealView(Platform):
     max_mem_size = Param.Addr('256MB', "Maximum amount of RAM supported by platform")
 
     def setupBootLoader(self, mem_bus, cur_sys, loc):
-        self.nvmem = PhysicalMemory(range = AddrRange(Addr('2GB'), size = '64MB'), zero = True)
+        self.nvmem = SimpleMemory(range = AddrRange(Addr('2GB'),
+                                                    size = '64MB'),
+                                  zero = True)
         self.nvmem.port = mem_bus.master
         cur_sys.boot_loader = loc('boot.arm')
-        cur_sys.boot_loader_mem = self.nvmem
 
 
 # Reference for memory map and interrupt number
@@ -438,7 +439,8 @@ class VExpress_EMM(RealView):
                             BAR0 = 0x1C1A0000, BAR0Size = '256B',
                             BAR1 = 0x1C1A0100, BAR1Size = '4096B',
                             BAR0LegacyIO = True, BAR1LegacyIO = True)
-    vram           = PhysicalMemory(range = AddrRange(0x18000000, size='32MB'), zero = True)
+    vram           = SimpleMemory(range = AddrRange(0x18000000, size='32MB'),
+                                  zero = True)
     rtc            = PL031(pio_addr=0x1C170000, int_num=36)
 
     l2x0_fake      = IsaFake(pio_addr=0x2C100000, pio_size=0xfff)
@@ -453,10 +455,10 @@ class VExpress_EMM(RealView):
     mmc_fake       = AmbaFake(pio_addr=0x1c050000)
 
     def setupBootLoader(self, mem_bus, cur_sys, loc):
-        self.nvmem = PhysicalMemory(range = AddrRange(0, size = '64MB'), zero = True)
+        self.nvmem = SimpleMemory(range = AddrRange(0, size = '64MB'),
+                                  zero = True)
         self.nvmem.port = mem_bus.master
         cur_sys.boot_loader = loc('boot_emm.arm')
-        cur_sys.boot_loader_mem = self.nvmem
         cur_sys.atags_addr = 0x80000100
 
     # Attach I/O devices that are on chip and also set the appropriate