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authorChristopher Torng <clt67@cornell.edu>2014-03-01 23:35:23 -0600
committerChristopher Torng <clt67@cornell.edu>2014-03-01 23:35:23 -0600
commit919baa603d0b835c3202f9968a617a31f9116549 (patch)
treee5e075957313bbe9a9630b84e64c86545351e264 /src/arch/mips
parenta533f3f9831081625626f96f9434a00f3079e98e (diff)
downloadgem5-919baa603d0b835c3202f9968a617a31f9116549.tar.xz
cpu: Enable fast-forwarding for MIPS InOrderCPU and O3CPU
A copyRegs() function is added to MIPS utilities to copy architectural state from the old CPU to the new CPU during fast-forwarding. This addition alone enables fast-forwarding for the o3 cpu model running MIPS. The patch also adds takeOverFrom() and drainResume() functions to the InOrderCPU to enable it to take over from another CPU. This change enables fast-forwarding for the inorder cpu model running MIPS, but not for Alpha. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
Diffstat (limited to 'src/arch/mips')
-rw-r--r--src/arch/mips/utility.cc18
1 files changed, 17 insertions, 1 deletions
diff --git a/src/arch/mips/utility.cc b/src/arch/mips/utility.cc
index f84819756..ff410bad1 100644
--- a/src/arch/mips/utility.cc
+++ b/src/arch/mips/utility.cc
@@ -241,7 +241,23 @@ initCPU(ThreadContext *tc, int cpuId)
void
copyRegs(ThreadContext *src, ThreadContext *dest)
{
- panic("Copy Regs Not Implemented Yet\n");
+ // First loop through the integer registers.
+ for (int i = 0; i < NumIntRegs; i++)
+ dest->setIntRegFlat(i, src->readIntRegFlat(i));
+
+ // Then loop through the floating point registers.
+ for (int i = 0; i < NumFloatRegs; i++)
+ dest->setFloatRegFlat(i, src->readFloatRegFlat(i));
+
+ // Would need to add condition-code regs if implemented
+ assert(NumCCRegs == 0);
+
+ // Copy misc. registers
+ for (int i = 0; i < NumMiscRegs; i++)
+ dest->setMiscRegNoEffect(i, src->readMiscRegNoEffect(i));
+
+ // Copy over the PC State
+ dest->pcState(src->pcState());
}
void