From 93da9eb7f6d9b2ca84de74afd3e0cb07188db9e6 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Mon, 22 Oct 2007 14:30:45 -0700
Subject: CPU: Add functions to the "ExecContext"s that translate a given
 address.

--HG--
extra : convert_revision : 7d898c6b6b13094fd05326eaa0b095a3ab132397
---
 src/cpu/simple/atomic.cc | 113 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)

(limited to 'src/cpu/simple/atomic.cc')

diff --git a/src/cpu/simple/atomic.cc b/src/cpu/simple/atomic.cc
index 9f574e8be..4e52f9b33 100644
--- a/src/cpu/simple/atomic.cc
+++ b/src/cpu/simple/atomic.cc
@@ -366,6 +366,61 @@ AtomicSimpleCPU::read(Addr addr, T &data, unsigned flags)
     }
 }
 
+Fault
+AtomicSimpleCPU::translateDataReadAddr(Addr vaddr, Addr & paddr,
+        int size, unsigned flags)
+{
+    // use the CPU's statically allocated read request and packet objects
+    Request *req = &data_read_req;
+
+    if (traceData) {
+        traceData->setAddr(vaddr);
+    }
+
+    //The block size of our peer.
+    int blockSize = dcachePort.peerBlockSize();
+    //The size of the data we're trying to read.
+    int dataSize = size;
+
+    bool firstTimeThrough = true;
+
+    //The address of the second part of this access if it needs to be split
+    //across a cache line boundary.
+    Addr secondAddr = roundDown(vaddr + dataSize - 1, blockSize);
+
+    if(secondAddr > vaddr)
+        dataSize = secondAddr - vaddr;
+
+    while(1) {
+        req->setVirt(0, vaddr, dataSize, flags, thread->readPC());
+
+        // translate to physical address
+        Fault fault = thread->translateDataReadReq(req);
+
+        //If there's a fault, return it
+        if (fault != NoFault)
+            return fault;
+
+        if (firstTimeThrough) {
+            paddr = req->getPaddr();
+            firstTimeThrough = false;
+        }
+
+        //If we don't need to access a second cache line, stop now.
+        if (secondAddr <= vaddr)
+            return fault;
+
+        /*
+         * Set up for accessing the second cache line.
+         */
+
+        //Adjust the size to get the remaining bytes.
+        dataSize = vaddr + size - secondAddr;
+        //And access the right address.
+        vaddr = secondAddr;
+    }
+}
+
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
 
 template
@@ -524,6 +579,64 @@ AtomicSimpleCPU::write(T data, Addr addr, unsigned flags, uint64_t *res)
     }
 }
 
+Fault
+AtomicSimpleCPU::translateDataWriteAddr(Addr vaddr, Addr &paddr,
+        int size, unsigned flags)
+{
+    // use the CPU's statically allocated write request and packet objects
+    Request *req = &data_write_req;
+
+    if (traceData) {
+        traceData->setAddr(vaddr);
+    }
+
+    //The block size of our peer.
+    int blockSize = dcachePort.peerBlockSize();
+
+    //The address of the second part of this access if it needs to be split
+    //across a cache line boundary.
+    Addr secondAddr = roundDown(vaddr + size - 1, blockSize);
+
+    //The size of the data we're trying to read.
+    int dataSize = size;
+
+    bool firstTimeThrough = true;
+
+    if(secondAddr > vaddr)
+        dataSize = secondAddr - vaddr;
+
+    dcache_latency = 0;
+
+    while(1) {
+        req->setVirt(0, vaddr, flags, flags, thread->readPC());
+
+        // translate to physical address
+        Fault fault = thread->translateDataWriteReq(req);
+
+        //If there's a fault or we don't need to access a second cache line,
+        //stop now.
+        if (fault != NoFault)
+            return fault;
+
+        if (firstTimeThrough) {
+            paddr = req->getPaddr();
+            firstTimeThrough = false;
+        }
+
+        if (secondAddr <= vaddr)
+            return fault;
+
+        /*
+         * Set up for accessing the second cache line.
+         */
+
+        //Adjust the size to get the remaining bytes.
+        dataSize = vaddr + size - secondAddr;
+        //And access the right address.
+        vaddr = secondAddr;
+    }
+}
+
 
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
 
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