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Branch predictor could not predict a branch in a nested loop because:
1. The global history was not updated after a mispredict squash.
2. The global history was updated in the fetch stage. The choice predictors
that were updated used the changed global history. This is incorrect, as
it incorporates the state of global history after the branch in
encountered. Fixed update to choice predictor using the global history
state before the branch happened.
3. The global predictor table was also updated using the global history state
before the branch happened as above.
Additionally, parameters to initialize ctr and history size were reversed.
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Fixed up the patch from Yasuko Watanabe that enabled pipelining of fetch accessess to
icache to work with recent changes to main repository.
Also added in ability for fetch stage to delay issuing the fault carrying
nop when a pipeline fetch causes a fault and no fetch bandwidth is available
until the next cycle.
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Missing "!" made multiprocessor interrupts operate incorrectly.
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change hwrei back to being a non-control instruction so O3-FS mode will work
add squash in inorder that will catch a hwrei (or any other genric instruction)
that isnt a control inst but changes the PC. Additional testing still needs to be done
for inorder-FS mode but this change will free O3 development back up in the interim
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All protocols must specify their name
The include statement allows any file to include another file.
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This makes it possible to use the grammar multiple times and use the multiple
instances concurrently. This makes implementing an include statement as part
of a grammar possible.
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This change simplifies the code surrounding operand type handling and makes it
depend only on the ctype that goes with each operand type. Future changes will
allow defining operand types by their ctypes directly, convert the ISAs over
to that style of definition, and then remove support for the old style. These
changes are to make it easier to use non-builtin types like classes or
structures as the type for operands.
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Addition of functional access support to Ruby necessitated some changes to
the way coherence protocols are written. I had forgotten to update the
Network_test protocol. This patch makes those updates.
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readBytes and writeBytes had the word "bytes" in their names because they
accessed blobs of bytes. This distinguished them from the read and write
functions which handled higher level data types. Because those functions don't
exist any more, this change renames readBytes and writeBytes to more general
names, readMem and writeMem, which reflect the fact that they are how you read
and write memory. This also makes their names more consistent with the
register reading/writing functions, although those are still read and set for
some reason.
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If a fault was returned by the CPU when a store initiated it's write, the
store instruction would ignore the fault. This change fixes that.
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The previous commit on functional access support in Ruby did not have
some of the files required. This patch adds those files to the repository.
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This patch rpovides functional access support in Ruby. Currently only
the M5Port of RubyPort supports functional accesses. The support for
functional through the PioPort will be added as a separate patch.
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The patch corrects the print statement which prints the current and
the next pc. Instead of the next upc, the next pc was being printed.
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the -/+ signs were flipped for nmsub_s, nmsub_d, and nmadd_d
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this will safeguard future code from trying to remove
from the list twice. That code wouldnt break but would
waste time.
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handle them like we do in FS mode, by blocking the TLB until the fault
is handled by the fault->invoke()
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implement clearfetchbufferfunction
extend predecoder to use multiple threads and clear those on trap
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this will make sure we get the correct view of a FP register
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The DTB expects the correct PC in the ThreadContext
but how if the memory accesses are speculative? Shouldn't
we send along the requestor's PC to the translate functions?
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including IPR accesses and store-conditionals. These class of instructions will not
execute correctly in a superscalar machine
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Just "dfault" gets confusing while debugging. Why not
differentiate whether it's an access violation or page
fault
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if a faulting instruction reaches an execution unit,
then ignore it and pass it through the pipeline.
Once we recognize the fault in the graduation unit,
dont allow a second fault to creep in on the same cycle.
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handle "snoop" port registration as well as functional
port setup for FS mode
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use a dummy instruction to facilitate the squash after
the interrupts trap
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Before graduating an instruction, explicitly check fault
by making the fault check it's own separate command
that can be put on an instruction schedule.
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