diff options
Diffstat (limited to 'src/arch/alpha/locked_mem.hh')
| -rw-r--r-- | src/arch/alpha/locked_mem.hh | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/src/arch/alpha/locked_mem.hh b/src/arch/alpha/locked_mem.hh index 52fe24173..df66b92bc 100644 --- a/src/arch/alpha/locked_mem.hh +++ b/src/arch/alpha/locked_mem.hh @@ -35,6 +35,14 @@ * @file * * ISA-specific helper functions for locked memory accesses. + * + * Note that these functions are not embedded in the ISA description + * because they operate on the *physical* address rather than the + * virtual address. In the current M5 design, the physical address is + * not accessible from the ISA description, only from the CPU model. + * Thus the CPU is responsible for calling back to the ISA (here) + * after the address translation has been performed to allow the ISA + * to do these manipulations based on the physical address. */ #include "arch/alpha/miscregfile.hh" @@ -48,8 +56,8 @@ template <class XC> inline void handleLockedRead(XC *xc, Request *req) { - xc->setMiscReg(MISCREG_LOCKADDR, req->getPaddr() & ~0xf); - xc->setMiscReg(MISCREG_LOCKFLAG, true); + xc->setMiscRegNoEffect(MISCREG_LOCKADDR, req->getPaddr() & ~0xf); + xc->setMiscRegNoEffect(MISCREG_LOCKFLAG, true); } @@ -60,16 +68,16 @@ handleLockedWrite(XC *xc, Request *req) if (req->isUncacheable()) { // Funky Turbolaser mailbox access...don't update // result register (see stq_c in decoder.isa) - req->setScResult(2); + req->setExtraData(2); } else { // standard store conditional - bool lock_flag = xc->readMiscReg(MISCREG_LOCKFLAG); - Addr lock_addr = xc->readMiscReg(MISCREG_LOCKADDR); + bool lock_flag = xc->readMiscRegNoEffect(MISCREG_LOCKFLAG); + Addr lock_addr = xc->readMiscRegNoEffect(MISCREG_LOCKADDR); if (!lock_flag || (req->getPaddr() & ~0xf) != lock_addr) { // Lock flag not set or addr mismatch in CPU; // don't even bother sending to memory system - req->setScResult(0); - xc->setMiscReg(MISCREG_LOCKFLAG, false); + req->setExtraData(0); + xc->setMiscRegNoEffect(MISCREG_LOCKFLAG, false); // the rest of this code is not architectural; // it's just a debugging aid to help detect // livelock by warning on long sequences of failed |