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author | William Wang <william.wang@arm.com> | 2012-03-30 09:40:11 -0400 |
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committer | William Wang <william.wang@arm.com> | 2012-03-30 09:40:11 -0400 |
commit | f9d403a7b95c50a8b75f8442101eb87ca465f967 (patch) | |
tree | a8302eb02dd5947d53b9437cc19d552145267189 /src/arch/x86/tlb.hh | |
parent | a14013af3a9e04d68985aea7bcff6c1e70bdbb82 (diff) | |
download | gem5-f9d403a7b95c50a8b75f8442101eb87ca465f967.tar.xz |
MEM: Introduce the master/slave port sub-classes in C++
This patch introduces the notion of a master and slave port in the C++
code, thus bringing the previous classification from the Python
classes into the corresponding simulation objects and memory objects.
The patch enables us to classify behaviours into the two bins and add
assumptions and enfore compliance, also simplifying the two
interfaces. As a starting point, isSnooping is confined to a master
port, and getAddrRanges to slave ports. More of these specilisations
are to come in later patches.
The getPort function is not getMasterPort and getSlavePort, and
returns a port reference rather than a pointer as NULL would never be
a valid return value. The default implementation of these two
functions is placed in MemObject, and calls fatal.
The one drawback with this specific patch is that it requires some
code duplication, e.g. QueuedPort becomes QueuedMasterPort and
QueuedSlavePort, and BusPort becomes BusMasterPort and BusSlavePort
(avoiding multiple inheritance). With the later introduction of the
port interfaces, moving the functionality outside the port itself, a
lot of the duplicated code will disappear again.
Diffstat (limited to 'src/arch/x86/tlb.hh')
-rw-r--r-- | src/arch/x86/tlb.hh | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/arch/x86/tlb.hh b/src/arch/x86/tlb.hh index 078b8b8d6..bcadda762 100644 --- a/src/arch/x86/tlb.hh +++ b/src/arch/x86/tlb.hh @@ -125,7 +125,17 @@ namespace X86ISA virtual void serialize(std::ostream &os); virtual void unserialize(Checkpoint *cp, const std::string §ion); - virtual Port * getPort(); + /** + * Get the table walker master port. This is used for + * migrating port connections during a CPU takeOverFrom() + * call. For architectures that do not have a table walker, + * NULL is returned, hence the use of a pointer rather than a + * reference. For X86 this method will always return a valid + * port pointer. + * + * @return A pointer to the walker master port + */ + virtual MasterPort *getMasterPort(); }; } |