1/*
2 * Copyright (c) 2010 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

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38 */
39
40#include "arch/arm/faults.hh"
41#include "arch/arm/table_walker.hh"
42#include "arch/arm/tlb.hh"
43#include "dev/io_device.hh"
44#include "cpu/thread_context.hh"
45
46#define NUM_WALKERS 2 // 2 should be enough to handle crossing page boundaries
47
48using namespace ArmISA;
49
50TableWalker::TableWalker(const Params *p)
51 : MemObject(p), stateQueue(NUM_WALKERS), port(NULL), tlb(NULL),
52 currState(NULL), doL1DescEvent(this), doL2DescEvent(this)
53{
54 sctlr = 0;
55}
56
57TableWalker::~TableWalker()
58{
59 ;

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150 currState->tc = NULL;
151 currState->req = NULL;
152 return f;
153 }
154
155 if (currState->timing) {
156 port->dmaAction(MemCmd::ReadReq, l1desc_addr, sizeof(uint32_t),
157 &doL1DescEvent, (uint8_t*)&currState->l1Desc.data, (Tick)0);
158 DPRINTF(TLBVerbose, "Adding to walker fifo: %d free before adding\n",
159 stateQueue.free_slots());
160 stateQueue.add(*currState);
161 currState = NULL;
162 } else {
163 port->dmaAction(MemCmd::ReadReq, l1desc_addr, sizeof(uint32_t),
164 NULL, (uint8_t*)&currState->l1Desc.data, (Tick)0);
165 doL1Descriptor();
166 f = currState->fault;
167 }
168

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562 currState->req = NULL;
563 }
564 tlb->insert(currState->vaddr, te);
565}
566
567void
568TableWalker::doL1DescriptorWrapper()
569{
570 currState = stateQueue.peek();
571 currState->delayed = false;
572
573 DPRINTF(TLBVerbose, "calling doL1Descriptor for vaddr:%#x\n", currState->vaddr);
574 doL1Descriptor();
575
576 // Check if fault was generated
577 if (currState->fault != NoFault) {
578 currState->transState->finish(currState->fault, currState->req,
579 currState->tc, currState->mode);
580
581 currState->req = NULL;
582 currState->tc = NULL;
583 currState->delayed = false;
584
585 stateQueue.remove();
586 }
587 else if (!currState->delayed) {
588 DPRINTF(TLBVerbose, "calling translateTiming again\n");
589 currState->fault = tlb->translateTiming(currState->req, currState->tc,
590 currState->transState, currState->mode);
591
592 currState->req = NULL;
593 currState->tc = NULL;
594 currState->delayed = false;
595
596 stateQueue.remove();
597 }
598 currState = NULL;
599}
600
601void
602TableWalker::doL2DescriptorWrapper()
603{
604 currState = stateQueue.peek();
605 assert(currState->delayed);
606
607 DPRINTF(TLBVerbose, "calling doL2Descriptor for vaddr:%#x\n",
608 currState->vaddr);
609 doL2Descriptor();
610
611 // Check if fault was generated
612 if (currState->fault != NoFault) {

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618 currState->fault = tlb->translateTiming(currState->req, currState->tc,
619 currState->transState, currState->mode);
620 }
621
622 currState->req = NULL;
623 currState->tc = NULL;
624 currState->delayed = false;
625
626 stateQueue.remove();
627 currState = NULL;
628}
629
630ArmISA::TableWalker *
631ArmTableWalkerParams::create()
632{
633 return new ArmISA::TableWalker(this);
634}
635