1/* 2 * Copyright (c) 2003-2005 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; --- 615 unchanged lines hidden (view full) --- 624 const StaticInstPtr &inst) 625{ 626 if (FullSystem) { 627 SparcFaultBase::invoke(tc, inst); 628 return; 629 } 630 631 Process *p = tc->getProcessPtr(); |
632 TlbEntry *entry = p->pTable->lookup(vaddr); 633 panic_if(!entry, "Tried to execute unmapped address %#x.\n", vaddr); |
634 |
635 Addr alignedvaddr = p->pTable->pageAlign(vaddr); |
636 |
637 // Grab fields used during instruction translation to figure out 638 // which context to use. 639 uint64_t tlbdata = tc->readMiscRegNoEffect(MISCREG_TLB_DATA); |
640 |
641 // Inside a VM, a real address is the address that guest OS would 642 // interpret to be a physical address. To map to the physical address, 643 // it still needs to undergo a translation. The instruction 644 // translation code in the SPARC ITLB code assumes that the context is 645 // zero (kernel-level) if real addressing is being used. 646 bool is_real_address = !bits(tlbdata, 4); |
647 |
648 // The SPARC ITLB code assumes that traps are executed in context 649 // zero so we carry that assumption through here. 650 bool trapped = bits(tlbdata, 18, 16) > 0; |
651 |
652 // The primary context acts as a PASID. It allows the MMU to 653 // distinguish between virtual addresses that would alias to the 654 // same physical address (if two or more processes shared the same 655 // virtual address mapping). 656 int primary_context = bits(tlbdata, 47, 32); |
657 |
658 // The partition id distinguishes between virtualized environments. 659 int const partition_id = 0; |
660 |
661 // Given the assumptions in the translateInst code in the SPARC ITLB, 662 // the logic works out to the following for the context. 663 int context_id = (is_real_address || trapped) ? 0 : primary_context; 664 665 // Insert the TLB entry. 666 // The entry specifying whether the address is "real" is set to 667 // false for syscall emulation mode regardless of whether the 668 // address is real in preceding code. Not sure sure that this is 669 // correct, but also not sure if it matters at all. 670 dynamic_cast<TLB *>(tc->getITBPtr())-> 671 insert(alignedvaddr, partition_id, context_id, false, entry->pte); |
672} 673 674void 675FastDataAccessMMUMiss::invoke(ThreadContext *tc, const StaticInstPtr &inst) 676{ 677 if (FullSystem) { 678 SparcFaultBase::invoke(tc, inst); 679 return; 680 } 681 682 Process *p = tc->getProcessPtr(); |
683 TlbEntry *entry = p->pTable->lookup(vaddr); 684 if (!entry && p->fixupStackFault(vaddr)) 685 entry = p->pTable->lookup(vaddr); 686 panic_if(!entry, "Tried to access unmapped address %#x.\n", vaddr); |
687 |
688 Addr alignedvaddr = p->pTable->pageAlign(vaddr); |
689 |
690 // Grab fields used during data translation to figure out 691 // which context to use. 692 uint64_t tlbdata = tc->readMiscRegNoEffect(MISCREG_TLB_DATA); |
693 |
694 // The primary context acts as a PASID. It allows the MMU to 695 // distinguish between virtual addresses that would alias to the 696 // same physical address (if two or more processes shared the same 697 // virtual address mapping). There's a secondary context used in the 698 // DTLB translation code, but it should __probably__ be zero for 699 // syscall emulation code. (The secondary context is used by Solaris 700 // to allow kernel privilege code to access user space code: 701 // [ISBN 0-13-022496-0]:PG199.) 702 int primary_context = bits(tlbdata, 47, 32); |
703 |
704 // "Hyper-Privileged Mode" is in use. There are three main modes of 705 // operation for Sparc: Hyper-Privileged Mode, Privileged Mode, and 706 // User Mode. 707 int hpriv = bits(tlbdata, 0); |
708 |
709 // Reset, Error and Debug state is in use. Something horrible has 710 // happened or the system is operating in Reset Mode. 711 int red = bits(tlbdata, 1); |
712 |
713 // Inside a VM, a real address is the address that guest OS would 714 // interpret to be a physical address. To map to the physical address, 715 // it still needs to undergo a translation. The instruction 716 // translation code in the SPARC ITLB code assumes that the context is 717 // zero (kernel-level) if real addressing is being used. 718 int is_real_address = !bits(tlbdata, 5); |
719 |
720 // Grab the address space identifier register from the thread context. 721 // XXX: Inspecting how setMiscReg and setMiscRegNoEffect behave for 722 // MISCREG_ASI causes me to think that the ASI register implementation 723 // might be bugged. The NoEffect variant changes the ASI register 724 // value in the architectural state while the normal variant changes 725 // the context field in the thread context's currently decoded request 726 // but does not directly affect the ASI register value in the 727 // architectural state. The ASI values and the context field in the 728 // request packet seem to have completely different uses. 729 MiscReg reg_asi = tc->readMiscRegNoEffect(MISCREG_ASI); 730 ASI asi = static_cast<ASI>(reg_asi); |
731 |
732 // The SPARC DTLB code assumes that traps are executed in context 733 // zero if the asi value is ASI_IMPLICIT (which is 0x0). There's also 734 // an assumption that the nucleus address space is being used, but 735 // the context is the relevant issue since we need to pass it to TLB. 736 bool trapped = bits(tlbdata, 18, 16) > 0; |
737 |
738 // Given the assumptions in the translateData code in the SPARC DTLB, 739 // the logic works out to the following for the context. 740 int context_id = ((!hpriv && !red && is_real_address) || 741 asiIsReal(asi) || 742 (trapped && asi == ASI_IMPLICIT)) 743 ? 0 : primary_context; |
744 |
745 // The partition id distinguishes between virtualized environments. 746 int const partition_id = 0; 747 748 // Insert the TLB entry. 749 // The entry specifying whether the address is "real" is set to 750 // false for syscall emulation mode regardless of whether the 751 // address is real in preceding code. Not sure sure that this is 752 // correct, but also not sure if it matters at all. 753 dynamic_cast<TLB *>(tc->getDTBPtr())-> 754 insert(alignedvaddr, partition_id, context_id, false, entry->pte); |
755} 756 757void 758SpillNNormal::invoke(ThreadContext *tc, const StaticInstPtr &inst) 759{ 760 if (FullSystem) { 761 SparcFaultBase::invoke(tc, inst); 762 return; --- 61 unchanged lines hidden --- |