9e3c8de30b
This patch is adding a clearer design intent to all objects that would not be complete without a port proxy by making the proxies members rathen than dynamically allocated. In essence, if NULL would not be a valid value for the proxy, then we avoid using a pointer to make this clear. The same approach is used for the methods using these proxies, such as loadSections, that now use references rather than pointers to better reflect the fact that NULL would not be an acceptable value (in fact the code would break and that is how this patch started out). Overall the concept of "using a reference to express unconditional composition where a NULL pointer is never valid" could be done on a much broader scale throughout the code base, but for now it is only done in the locations affected by the proxies.
134 lines
4.8 KiB
C++
134 lines
4.8 KiB
C++
/*
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* Copyright (c) 2002-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ali Saidi
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*/
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#include <string>
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#include "arch/sparc/tlb.hh"
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#include "arch/sparc/vtophys.hh"
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#include "base/chunk_generator.hh"
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#include "base/compiler.hh"
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#include "base/trace.hh"
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#include "cpu/thread_context.hh"
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#include "debug/VtoPhys.hh"
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#include "mem/port_proxy.hh"
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using namespace std;
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namespace SparcISA {
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Addr
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vtophys(Addr vaddr)
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{
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// In SPARC it's almost always impossible to turn a VA->PA w/o a
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// context The only times we can kinda do it are if we have a
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// SegKPM mapping and can find the real address in the tlb or we
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// have a physical adddress already (beacuse we are looking at the
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// hypervisor) Either case is rare, so we'll just panic.
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panic("vtophys() without context on SPARC largly worthless\n");
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M5_DUMMY_RETURN;
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}
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Addr
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vtophys(ThreadContext *tc, Addr addr)
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{
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// Here we have many options and are really implementing something like
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// a fill handler to find the address since there isn't a multilevel
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// table for us to walk around.
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//
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// 1. We are currently hyperpriv, return the address unmodified
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// 2. The mmu is off return(ra->pa)
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// 3. We are currently priv, use ctx0* tsbs to find the page
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// 4. We are not priv, use ctxN0* tsbs to find the page
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// For all accesses we check the tlbs first since it's possible that
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// long standing pages (e.g. locked kernel mappings) won't be in the tsb
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uint64_t tlbdata = tc->readMiscRegNoEffect(MISCREG_TLB_DATA);
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bool hpriv = bits(tlbdata,0,0);
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// bool priv = bits(tlbdata,2,2);
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bool addr_mask = bits(tlbdata,3,3);
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bool data_real = !bits(tlbdata,5,5);
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bool inst_real = !bits(tlbdata,4,4);
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bool ctx_zero = bits(tlbdata,18,16) > 0;
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int part_id = bits(tlbdata,15,8);
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int pri_context = bits(tlbdata,47,32);
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// int sec_context = bits(tlbdata,63,48);
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PortProxy &mem = tc->getPhysProxy();
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TLB* itb = tc->getITBPtr();
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TLB* dtb = tc->getDTBPtr();
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TlbEntry* tbe;
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PageTableEntry pte;
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Addr tsbs[4];
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Addr va_tag;
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TteTag ttetag;
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if (hpriv)
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return addr;
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if (addr_mask)
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addr = addr & VAddrAMask;
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tbe = dtb->lookup(addr, part_id, data_real, ctx_zero ? 0 : pri_context ,
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false);
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if (tbe)
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goto foundtbe;
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tbe = itb->lookup(addr, part_id, inst_real, ctx_zero ? 0 : pri_context,
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false);
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if (tbe)
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goto foundtbe;
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// We didn't find it in the tlbs, so lets look at the TSBs
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dtb->GetTsbPtr(tc, addr, ctx_zero ? 0 : pri_context, tsbs);
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va_tag = bits(addr, 63, 22);
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for (int x = 0; x < 4; x++) {
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ttetag = betoh(mem.read<uint64_t>(tsbs[x]));
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if (ttetag.valid() && ttetag.va() == va_tag) {
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uint64_t entry = mem.read<uint64_t>(tsbs[x]) + sizeof(uint64_t);
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// I think it's sun4v at least!
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pte.populate(betoh(entry), PageTableEntry::sun4v);
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DPRINTF(VtoPhys, "Virtual(%#x)->Physical(%#x) found in TTE\n",
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addr, pte.translate(addr));
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goto foundpte;
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}
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}
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panic("couldn't translate %#x\n", addr);
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foundtbe:
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pte = tbe->pte;
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DPRINTF(VtoPhys, "Virtual(%#x)->Physical(%#x) found in TLB\n", addr,
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pte.translate(addr));
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foundpte:
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return pte.translate(addr);
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}
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} // namespace SparcISA
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