cpu: Add CPU support for generatig wake up events when LLSC adresses are snooped.

This patch add support for generating wake-up events in the CPU when an address
that is currently in the exclusive state is hit by a snoop. This mechanism is required
for ARMv8 multi-processor support.

6 files changed, 46 insertions, 13 deletions

diff --git a/src/arch/alpha/locked_mem.hh b/src/arch/alpha/locked_mem.hh
index e62ed1654..253b94be4 100644
--- a/src/arch/alpha/locked_mem.hh
+++ b/src/arch/alpha/locked_mem.hh
@@ -93,10 +93,15 @@ handleLockedRead(XC *xc, Request *req)
     xc->setMiscReg(MISCREG_LOCKFLAG, true);
 }
 
+template <class XC>
+inline void
+handleLockedSnoopHit(XC *xc)
+{
+}
 
 template <class XC>
 inline bool
-handleLockedWrite(XC *xc, Request *req)
+handleLockedWrite(XC *xc, Request *req, Addr cacheBlockMask)
 {
     if (req->isUncacheable()) {
         // Funky Turbolaser mailbox access...don't update
diff --git a/src/arch/arm/locked_mem.hh b/src/arch/arm/locked_mem.hh
index 37973ff98..f2601f00c 100644
--- a/src/arch/arm/locked_mem.hh
+++ b/src/arch/arm/locked_mem.hh
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012 ARM Limited
+ * Copyright (c) 2012-2013 ARM Limited
  * All rights reserved
  *
  * The license below extends only to copyright in the software and shall
@@ -66,9 +66,7 @@ handleLockedSnoop(XC *xc, PacketPtr pkt, Addr cacheBlockMask)
         return;
 
     Addr locked_addr = xc->readMiscReg(MISCREG_LOCKADDR) & cacheBlockMask;
-    Addr snoop_addr = pkt->getAddr();
-
-    assert((cacheBlockMask & snoop_addr) == snoop_addr);
+    Addr snoop_addr = pkt->getAddr() & cacheBlockMask;
 
     if (locked_addr == snoop_addr)
         xc->setMiscReg(MISCREG_LOCKFLAG, false);
@@ -76,16 +74,22 @@ handleLockedSnoop(XC *xc, PacketPtr pkt, Addr cacheBlockMask)
 
 template <class XC>
 inline void
+handleLockedSnoopHit(XC *xc)
+{
+}
+
+template <class XC>
+inline void
 handleLockedRead(XC *xc, Request *req)
 {
-    xc->setMiscReg(MISCREG_LOCKADDR, req->getPaddr() & ~0xf);
+    xc->setMiscReg(MISCREG_LOCKADDR, req->getPaddr());
     xc->setMiscReg(MISCREG_LOCKFLAG, true);
 }
 
 
 template <class XC>
 inline bool
-handleLockedWrite(XC *xc, Request *req)
+handleLockedWrite(XC *xc, Request *req, Addr cacheBlockMask)
 {
     if (req->isSwap())
         return true;
@@ -93,8 +97,8 @@ handleLockedWrite(XC *xc, Request *req)
     // Verify that the lock flag is still set and the address
     // is correct
     bool lock_flag = xc->readMiscReg(MISCREG_LOCKFLAG);
-    Addr lock_addr = xc->readMiscReg(MISCREG_LOCKADDR);
-    if (!lock_flag || (req->getPaddr() & ~0xf) != lock_addr) {
+    Addr lock_addr = xc->readMiscReg(MISCREG_LOCKADDR) & cacheBlockMask;
+    if (!lock_flag || (req->getPaddr() & cacheBlockMask) != lock_addr) {
         // Lock flag not set or addr mismatch in CPU;
         // don't even bother sending to memory system
         req->setExtraData(0);
diff --git a/src/arch/mips/locked_mem.hh b/src/arch/mips/locked_mem.hh
index b4003fea9..5b0f8a1b8 100644
--- a/src/arch/mips/locked_mem.hh
+++ b/src/arch/mips/locked_mem.hh
@@ -87,8 +87,14 @@ handleLockedRead(XC *xc, Request *req)
 }
 
 template <class XC>
+inline void
+handleLockedSnoopHit(XC *xc)
+{
+}
+
+template <class XC>
 inline bool
-handleLockedWrite(XC *xc, Request *req)
+handleLockedWrite(XC *xc, Request *req, Addr cacheBlockMask)
 {
     if (req->isUncacheable()) {
         // Funky Turbolaser mailbox access...don't update
diff --git a/src/arch/power/locked_mem.hh b/src/arch/power/locked_mem.hh
index f3d042d5c..d962f9aff 100644
--- a/src/arch/power/locked_mem.hh
+++ b/src/arch/power/locked_mem.hh
@@ -60,8 +60,14 @@ handleLockedRead(XC *xc, Request *req)
 }
 
 template <class XC>
+inline void
+handleLockedSnoopHit(XC *xc)
+{
+}
+
+template <class XC>
 inline bool
-handleLockedWrite(XC *xc, Request *req)
+handleLockedWrite(XC *xc, Request *req, Addr cacheBlockMask)
 {
     return true;
 }
diff --git a/src/arch/sparc/locked_mem.hh b/src/arch/sparc/locked_mem.hh
index 8277ef487..b28179481 100644
--- a/src/arch/sparc/locked_mem.hh
+++ b/src/arch/sparc/locked_mem.hh
@@ -54,10 +54,16 @@ handleLockedRead(XC *xc, Request *req)
 {
 }
 
+template <class XC>
+inline void
+handleLockedSnoopHit(XC *xc)
+{
+}
+
 
 template <class XC>
 inline bool
-handleLockedWrite(XC *xc, Request *req)
+handleLockedWrite(XC *xc, Request *req, Addr cacheBlockMask)
 {
     return true;
 }
diff --git a/src/arch/x86/locked_mem.hh b/src/arch/x86/locked_mem.hh
index c2a8395aa..51cfb2ea3 100644
--- a/src/arch/x86/locked_mem.hh
+++ b/src/arch/x86/locked_mem.hh
@@ -56,10 +56,16 @@ namespace X86ISA
 
     template <class XC>
     inline bool
-    handleLockedWrite(XC *xc, Request *req)
+    handleLockedWrite(XC *xc, Request *req, Addr cacheBlockMask)
     {
         return true;
     }
+
+    template <class XC>
+    inline void
+    handleLockedSnoopHit(XC *xc)
+    {
+    }
 }
 
 #endif // __ARCH_X86_LOCKEDMEM_HH__