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authorAndreas Sandberg <andreas.sandberg@arm.com>2018-03-06 15:36:33 +0000
committerAndreas Sandberg <andreas.sandberg@arm.com>2018-04-17 08:45:12 +0000
commit7c21795304e6ec79ed8c35873c4419a6342eb1e3 (patch)
tree9377024c6fad1d4eb05c1e3be4557c5dd031b950 /src/mem
parent8e7fdf4ac460cbfbb373c951a6c7cdae93446241 (diff)
downloadgem5-7c21795304e6ec79ed8c35873c4419a6342eb1e3.tar.xz
mem: Add a helper function to get a word of variable length
There are many devices that need to handle reads/writes of different word sizes. A common pattern is a switch statement that check for the size of a packet and then calls the corresponding Packet::(get|set)<uintXX_t> methods. Simplify this by implementing Packet::(get|set)UintX helper functions. The getter reads a word of the size specified in the packet and the specified endianness. The word is then zero-extended to 64 bits. Conversely, the setter truncates the word down to the size required in the packet and then byte-swaps it to the desired endianness. Change-Id: I2f0c27fe3903abf3859bea13b07c7f5f0fb0809f Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-on: https://gem5-review.googlesource.com/9761 Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Diffstat (limited to 'src/mem')
-rw-r--r--src/mem/packet.cc42
-rw-r--r--src/mem/packet.hh16
2 files changed, 56 insertions, 2 deletions
diff --git a/src/mem/packet.cc b/src/mem/packet.cc
index ffda3d5af..7a81cdbb7 100644
--- a/src/mem/packet.cc
+++ b/src/mem/packet.cc
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2011-2017 ARM Limited
+ * Copyright (c) 2011-2018 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -56,6 +56,7 @@
#include "base/cprintf.hh"
#include "base/logging.hh"
#include "base/trace.hh"
+#include "mem/packet_access.hh"
using namespace std;
@@ -364,6 +365,45 @@ Packet::popSenderState()
return sender_state;
}
+uint64_t
+Packet::getUintX(ByteOrder endian) const
+{
+ switch(getSize()) {
+ case 1:
+ return (uint64_t)get<uint8_t>(endian);
+ case 2:
+ return (uint64_t)get<uint16_t>(endian);
+ case 4:
+ return (uint64_t)get<uint32_t>(endian);
+ case 8:
+ return (uint64_t)get<uint64_t>(endian);
+ default:
+ panic("%i isn't a supported word size.\n", getSize());
+ }
+}
+
+void
+Packet::setUintX(uint64_t w, ByteOrder endian)
+{
+ switch(getSize()) {
+ case 1:
+ set<uint8_t>((uint8_t)w, endian);
+ break;
+ case 2:
+ set<uint16_t>((uint16_t)w, endian);
+ break;
+ case 4:
+ set<uint32_t>((uint32_t)w, endian);
+ break;
+ case 8:
+ set<uint64_t>((uint64_t)w, endian);
+ break;
+ default:
+ panic("%i isn't a supported word size.\n", getSize());
+ }
+
+}
+
void
Packet::print(ostream &o, const int verbosity, const string &prefix) const
{
diff --git a/src/mem/packet.hh b/src/mem/packet.hh
index b5b882c91..a4eeabe29 100644
--- a/src/mem/packet.hh
+++ b/src/mem/packet.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2012-2017 ARM Limited
+ * Copyright (c) 2012-2018 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -1068,6 +1068,20 @@ class Packet : public Printable
template <typename T>
void set(T v);
+
+ /**
+ * Get the data in the packet byte swapped from the specified
+ * endianness and zero-extended to 64 bits.
+ */
+ uint64_t getUintX(ByteOrder endian) const;
+
+ /**
+ * Set the value in the word w after truncating it to the length
+ * of the packet and then byteswapping it to the desired
+ * endianness.
+ */
+ void setUintX(uint64_t w, ByteOrder endian);
+
/**
* Copy data into the packet from the provided pointer.
*/