From 7933aade85a61ba745a9dd694b26b7420b7e649c Mon Sep 17 00:00:00 2001
From: Ali Saidi <saidi@eecs.umich.edu>
Date: Tue, 9 Jan 2007 22:16:49 -0500
Subject: add memory mapped disk device

configs/common/FSConfig.py:
src/python/m5/objects/T1000.py:
    add configuration for memory mapped disk
src/dev/sparc/SConscript:
    add memory mapped disk to sconscript

--HG--
extra : convert_revision : d8df4a455cf48000042d0ff93a274985f4dbe905
---
 src/dev/sparc/mm_disk.cc | 137 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 src/dev/sparc/mm_disk.cc

(limited to 'src/dev/sparc/mm_disk.cc')

diff --git a/src/dev/sparc/mm_disk.cc b/src/dev/sparc/mm_disk.cc
new file mode 100644
index 000000000..9057c28be
--- /dev/null
+++ b/src/dev/sparc/mm_disk.cc
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2006 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Ali Saidi
+ */
+
+/** @file
+ * This device acts as a disk similar to the memory mapped disk device
+ * in legion. Any access is translated to an offset in the disk image.
+ */
+
+#include "base/trace.hh"
+#include "dev/sparc/mm_disk.hh"
+#include "dev/platform.hh"
+#include "mem/port.hh"
+#include "mem/packet_access.hh"
+#include "sim/builder.hh"
+#include "sim/byteswap.hh"
+#include "sim/system.hh"
+
+MmDisk::MmDisk(Params *p)
+    : BasicPioDevice(p), image(p->image), curSector((uint64_t)-1), dirty(false)
+{
+    memset(&bytes, 0, SectorSize);
+    pioSize = image->size() * SectorSize;
+}
+
+Tick
+MmDisk::read(PacketPtr pkt)
+{
+    Addr accessAddr;
+    off_t sector;
+    off_t bytes_read;
+    uint16_t *d16;
+    uint32_t *d32;
+    uint64_t *d64;
+
+    assert(pkt->result == Packet::Unknown);
+    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
+    accessAddr = pkt->getAddr() - pioAddr;
+
+    sector = accessAddr / SectorSize;
+
+    if (sector != curSector) {
+        if (dirty)
+            bytes_read = image->write(bytes, curSector);
+        bytes_read = image->read(bytes,  sector);
+        curSector = sector;
+    }
+    switch (pkt->getSize()) {
+      case sizeof(uint8_t):
+        pkt->set(bytes[accessAddr % SectorSize]);
+        break;
+      case sizeof(uint16_t):
+        d16 = (uint16_t*)bytes + (accessAddr % SectorSize)/2;
+        pkt->set(htobe(*d16));
+        break;
+      case sizeof(uint32_t):
+        d32 = (uint32_t*)bytes + (accessAddr % SectorSize)/4;
+        pkt->set(htobe(*d32));
+        break;
+      case sizeof(uint64_t):
+        d64 = (uint64_t*)bytes + (accessAddr % SectorSize)/8;
+        pkt->set(htobe(*d64));
+        break;
+      default:
+        panic("Invalid access size\n");
+    }
+
+    pkt->result = Packet::Success;
+    return pioDelay;
+}
+
+Tick
+MmDisk::write(PacketPtr pkt)
+{
+   panic("need to implement\n");
+}
+
+
+BEGIN_DECLARE_SIM_OBJECT_PARAMS(MmDisk)
+    Param<Addr> pio_addr;
+    Param<Tick> pio_latency;
+    Param<Addr> pio_size;
+    SimObjectParam<Platform *> platform;
+    SimObjectParam<System *> system;
+    SimObjectParam<DiskImage *> image;
+END_DECLARE_SIM_OBJECT_PARAMS(MmDisk)
+
+BEGIN_INIT_SIM_OBJECT_PARAMS(MmDisk)
+
+    INIT_PARAM(pio_addr, "Device Address"),
+    INIT_PARAM(pio_latency, "Programmed IO latency"),
+    INIT_PARAM(pio_size, "Size of address range"),
+    INIT_PARAM(platform, "platform"),
+    INIT_PARAM(system, "system object"),
+    INIT_PARAM(image, "disk image")
+
+END_INIT_SIM_OBJECT_PARAMS(MmDisk)
+
+CREATE_SIM_OBJECT(MmDisk)
+{
+    MmDisk::Params *p = new MmDisk::Params;
+    p->name = getInstanceName();
+    p->pio_addr = pio_addr;
+    p->pio_delay = pio_latency;
+    p->platform = platform;
+    p->system = system;
+    p->image = image;
+    return new MmDisk(p);
+}
+
+REGISTER_SIM_OBJECT("MmDisk", MmDisk)
-- 
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