mem-ruby: add addressOffset util
Returns the offset of an address with respect to a base address.
Looks unnecessary, but SLICC doesn't support casting and the '-'
operator for Addr types, so the alternative to this would be to add
more some helpers like 'addrToUint64' and 'uint64ToInt'.
Change-Id: I90480cec4c8b2e6bb9706f8b94ed33abe3c93e78
Signed-off-by: Tiago Mück <tiago.muck@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/31270
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/src/mem/ruby/protocol/RubySlicc_Util.sm b/src/mem/ruby/protocol/RubySlicc_Util.sm
index b8b005a..70648ec 100644
--- a/src/mem/ruby/protocol/RubySlicc_Util.sm
+++ b/src/mem/ruby/protocol/RubySlicc_Util.sm
@@ -37,6 +37,7 @@
int IDToInt(NodeID id);
int addressToInt(Addr addr);
Addr intToAddress(int addr);
+int addressOffset(Addr addr, Addr base);
int max_tokens();
Addr makeLineAddress(Addr addr);
int getOffset(Addr addr);
diff --git a/src/mem/ruby/slicc_interface/RubySlicc_Util.hh b/src/mem/ruby/slicc_interface/RubySlicc_Util.hh
index b51b30c..b568425 100644
--- a/src/mem/ruby/slicc_interface/RubySlicc_Util.hh
+++ b/src/mem/ruby/slicc_interface/RubySlicc_Util.hh
@@ -169,6 +169,16 @@
}
}
+inline int
+addressOffset(Addr addr, Addr base)
+{
+ assert(addr >= base);
+ Addr offset = addr - base;
+ // sanity checks if fits in an int
+ assert(offset < INT_MAX);
+ return offset;
+}
+
/**
* This function accepts an address, a data block and a packet. If the address
* range for the data block contains the address which the packet needs to
