1/* 2 * Copyright (c) 2006 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; --- 21 unchanged lines hidden (view full) --- 30 31#ifndef __ARCH_ALPHA_LOCKED_MEM_HH__ 32#define __ARCH_ALPHA_LOCKED_MEM_HH__ 33 34/** 35 * @file 36 * 37 * ISA-specific helper functions for locked memory accesses. |
38 */ 39 40#include "arch/alpha/miscregfile.hh" 41#include "base/misc.hh" 42#include "mem/request.hh" 43 44 45namespace AlphaISA --- 9 unchanged lines hidden (view full) --- 55 56template <class XC> 57inline bool 58handleLockedWrite(XC *xc, Request *req) 59{ 60 if (req->isUncacheable()) { 61 // Funky Turbolaser mailbox access...don't update 62 // result register (see stq_c in decoder.isa) |
63 req->setExtraData(2); |
64 } else { 65 // standard store conditional 66 bool lock_flag = xc->readMiscReg(MISCREG_LOCKFLAG); 67 Addr lock_addr = xc->readMiscReg(MISCREG_LOCKADDR); 68 if (!lock_flag || (req->getPaddr() & ~0xf) != lock_addr) { 69 // Lock flag not set or addr mismatch in CPU; 70 // don't even bother sending to memory system |
71 req->setExtraData(0); |
72 xc->setMiscReg(MISCREG_LOCKFLAG, false); 73 // the rest of this code is not architectural; 74 // it's just a debugging aid to help detect 75 // livelock by warning on long sequences of failed 76 // store conditionals 77 int stCondFailures = xc->readStCondFailures(); 78 stCondFailures++; 79 xc->setStCondFailures(stCondFailures); --- 18 unchanged lines hidden --- |