1/*
2 * Copyright (c) 2007-2008 The Hewlett-Packard Development Company
3 * All rights reserved.
4 *
5 * Redistribution and use of this software in source and binary forms,
6 * with or without modification, are permitted provided that the
7 * following conditions are met:
8 *

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570 SegAttr csAttr = tc->readMiscRegNoEffect(MISCREG_CS_ATTR);
571 // If we're not in 64-bit mode, do protection/limit checks
572 if (!efer.lma || !csAttr.longMode) {
573 DPRINTF(TLB, "Not in long mode. Checking segment protection.\n");
574 // Check for a NULL segment selector.
575 if (!tc->readMiscRegNoEffect(MISCREG_SEG_SEL(seg)))
576 return new GeneralProtection(0);
577 bool expandDown = false;
578 if (seg >= SEGMENT_REG_ES && seg <= SEGMENT_REG_HS) {
579 SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg));
580 if (!attr.writable && write)
581 return new GeneralProtection(0);
582 if (!attr.readable && !write && !execute)
583 return new GeneralProtection(0);
584 expandDown = attr.expandDown;
585 }
586 Addr base = tc->readMiscRegNoEffect(MISCREG_SEG_BASE(seg));
587 Addr limit = tc->readMiscRegNoEffect(MISCREG_SEG_LIMIT(seg));
588 if (expandDown) {
589 DPRINTF(TLB, "Checking an expand down segment.\n");
590 // We don't have to worry about the access going around the
591 // end of memory because accesses will be broken up into
592 // pieces at boundaries aligned on sizes smaller than an
593 // entire address space. We do have to worry about the limit
594 // being less than the base.
595 if (limit < base) {
596 if (limit < vaddr + req->getSize() && vaddr < base)
597 return new GeneralProtection(0);
598 } else {
599 if (limit < vaddr + req->getSize())
600 return new GeneralProtection(0);
601 }
602 } else {
603 if (limit < base) {
604 if (vaddr <= limit || vaddr + req->getSize() >= base)
605 return new GeneralProtection(0);
606 } else {
607 if (vaddr <= limit && vaddr + req->getSize() >= base)
608 return new GeneralProtection(0);
609 }
610 }
611 }
612 // If paging is enabled, do the translation.
613 if (cr0.pg) {
614 DPRINTF(TLB, "Paging enabled.\n");
615 // The vaddr already has the segment base applied.
616 TlbEntry *entry = lookup(vaddr);
617 if (!entry) {

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