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authorAndreas Hansson <andreas.hansson@arm.com>2015-07-30 03:41:39 -0400
committerAndreas Hansson <andreas.hansson@arm.com>2015-07-30 03:41:39 -0400
commit5902e29e84037b6f0dd470c09a73f5590368d755 (patch)
tree9cfa055a06b77017863455613fa7aea63c724742 /src/mem/cache/blk.hh
parent41b39b22cd72bb9095d3ee62c95d52597ac09e1e (diff)
downloadgem5-5902e29e84037b6f0dd470c09a73f5590368d755.tar.xz
mem: Tidy up CacheBlk class
This patch modernises and tidies up the CacheBlk, removing dead code.
Diffstat (limited to 'src/mem/cache/blk.hh')
-rw-r--r--src/mem/cache/blk.hh71
1 files changed, 23 insertions, 48 deletions
diff --git a/src/mem/cache/blk.hh b/src/mem/cache/blk.hh
index 09599b694..f082a9ef0 100644
--- a/src/mem/cache/blk.hh
+++ b/src/mem/cache/blk.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2012-2014 ARM Limited
+ * Copyright (c) 2012-2015 ARM Limited
* All rights reserved.
*
* The license below extends only to copyright in the software and shall
@@ -45,20 +45,19 @@
* Definitions of a simple cache block class.
*/
-#ifndef __CACHE_BLK_HH__
-#define __CACHE_BLK_HH__
+#ifndef __MEM_CACHE_BLK_HH__
+#define __MEM_CACHE_BLK_HH__
#include <list>
#include "base/printable.hh"
#include "mem/packet.hh"
#include "mem/request.hh"
-#include "sim/core.hh" // for Tick
/**
* Cache block status bit assignments
*/
-enum CacheBlkStatusBits {
+enum CacheBlkStatusBits : unsigned {
/** valid, readable */
BlkValid = 0x01,
/** write permission */
@@ -67,8 +66,6 @@ enum CacheBlkStatusBits {
BlkReadable = 0x04,
/** dirty (modified) */
BlkDirty = 0x08,
- /** block was referenced */
- BlkReferenced = 0x10,
/** block was a hardware prefetch yet unaccessed*/
BlkHWPrefetched = 0x20,
/** block holds data from the secure memory space */
@@ -98,7 +95,7 @@ class CacheBlk
*/
uint8_t *data;
/** the number of bytes stored in this block. */
- int size;
+ unsigned size;
/** block state: OR of CacheBlkStatusBit */
typedef unsigned State;
@@ -119,7 +116,7 @@ class CacheBlk
bool isTouched;
/** Number of references to this block since it was brought in. */
- int refCount;
+ unsigned refCount;
/** holds the source requestor ID for this block. */
int srcMasterId;
@@ -138,7 +135,7 @@ class CacheBlk
Addr highAddr; // high address of lock range
// check for matching execution context
- bool matchesContext(Request *req)
+ bool matchesContext(const RequestPtr req) const
{
Addr req_low = req->getPaddr();
Addr req_high = req_low + req->getSize() -1;
@@ -146,7 +143,7 @@ class CacheBlk
(req_low >= lowAddr) && (req_high <= highAddr);
}
- bool overlapping(Request *req)
+ bool overlapping(const RequestPtr req) const
{
Addr req_low = req->getPaddr();
Addr req_high = req_low + req->getSize() - 1;
@@ -154,7 +151,7 @@ class CacheBlk
return (req_low <= highAddr) && (req_high >= lowAddr);
}
- Lock(Request *req)
+ Lock(const RequestPtr req)
: contextId(req->contextId()),
lowAddr(req->getPaddr()),
highAddr(lowAddr + req->getSize() - 1)
@@ -176,24 +173,8 @@ class CacheBlk
tickInserted(0)
{}
- /**
- * Copy the state of the given block into this one.
- * @param rhs The block to copy.
- * @return a const reference to this block.
- */
- const CacheBlk& operator=(const CacheBlk& rhs)
- {
- asid = rhs.asid;
- tag = rhs.tag;
- data = rhs.data;
- size = rhs.size;
- status = rhs.status;
- whenReady = rhs.whenReady;
- set = rhs.set;
- refCount = rhs.refCount;
- task_id = rhs.task_id;
- return *this;
- }
+ CacheBlk(const CacheBlk&) = delete;
+ CacheBlk& operator=(const CacheBlk&) = delete;
/**
* Checks the write permissions of this block.
@@ -246,15 +227,6 @@ class CacheBlk
}
/**
- * Check if this block has been referenced.
- * @return True if the block has been referenced.
- */
- bool isReferenced() const
- {
- return (status & BlkReferenced) != 0;
- }
-
- /**
* Check if this block was the result of a hardware prefetch, yet to
* be touched.
* @return True if the block was a hardware prefetch, unaccesed.
@@ -282,21 +254,21 @@ class CacheBlk
void trackLoadLocked(PacketPtr pkt)
{
assert(pkt->isLLSC());
- lockList.push_front(Lock(pkt->req));
+ lockList.emplace_front(pkt->req);
}
/**
* Clear the list of valid load locks. Should be called whenever
* block is written to or invalidated.
*/
- void clearLoadLocks(Request *req = NULL)
+ void clearLoadLocks(RequestPtr req = nullptr)
{
if (!req) {
// No request, invaldate all locks to this line
lockList.clear();
} else {
// Only invalidate locks that overlap with this request
- std::list<Lock>::iterator lock_itr = lockList.begin();
+ auto lock_itr = lockList.begin();
while (lock_itr != lockList.end()) {
if (lock_itr->overlapping(req)) {
lock_itr = lockList.erase(lock_itr);
@@ -350,16 +322,19 @@ class CacheBlk
*/
bool checkWrite(PacketPtr pkt)
{
- Request *req = pkt->req;
+ // common case
+ if (!pkt->isLLSC() && lockList.empty())
+ return true;
+
+ RequestPtr req = pkt->req;
+
if (pkt->isLLSC()) {
// it's a store conditional... have to check for matching
// load locked.
bool success = false;
- for (std::list<Lock>::iterator i = lockList.begin();
- i != lockList.end(); ++i)
- {
- if (i->matchesContext(req)) {
+ for (const auto& l : lockList) {
+ if (l.matchesContext(req)) {
// it's a store conditional, and as far as the memory
// system can tell, the requesting context's lock is
// still valid.
@@ -412,4 +387,4 @@ class CacheBlkVisitor
virtual bool operator()(CacheBlk &blk) = 0;
};
-#endif //__CACHE_BLK_HH__
+#endif //__MEM_CACHE_BLK_HH__