/*
- * Copyright (c) 2003 The Regents of The University of Michigan
+ * Copyright (c) 2001-2004 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
//
// Alpha TLB
//
+#ifdef DEBUG
+bool uncacheBit39 = false;
+bool uncacheBit40 = false;
+#endif
+
AlphaTLB::AlphaTLB(const string &name, int s)
: SimObject(name), size(s), nlu(0)
{
{
// in Alpha, cacheability is controlled by upper-level bits of the
// physical address
- if (req->paddr & PA_UNCACHED_BIT) {
+
+ /*
+ * We support having the uncacheable bit in either bit 39 or bit 40.
+ * The Turbolaser platform (and EV5) support having the bit in 39, but
+ * Tsunami (which Linux assumes uses an EV6) generates accesses with
+ * the bit in 40. So we must check for both, but we have debug flags
+ * to catch a weird case where both are used, which shouldn't happen.
+ */
+
+
+#ifdef ALPHA_TLASER
+ if (req->paddr & PA_UNCACHED_BIT_39) {
+#else
+ if (req->paddr & PA_UNCACHED_BIT_43) {
+#endif
+ // IPR memory space not implemented
if (PA_IPR_SPACE(req->paddr)) {
- // IPR memory space not implemented
if (!req->xc->misspeculating()) {
switch (req->paddr) {
case ULL(0xFFFFF00188):
} else {
// mark request as uncacheable
req->flags |= UNCACHEABLE;
+
+#ifndef ALPHA_TLASER
+ // Clear bits 42:35 of the physical address (10-2 in Tsunami manual)
+ req->paddr &= PA_UNCACHED_MASK;
+#endif
}
}
}
return ITB_Acv_Fault;
}
- // Check for "superpage" mapping: when SP<1> is set, and
- // VA<42:41> == 2, VA<39:13> maps directly to PA<39:13>.
+
+ // VA<42:41> == 2, VA<39:13> maps directly to PA<39:13> for EV5
+ // VA<47:41> == 0x7e, VA<40:13> maps directly to PA<40:13> for EV6
+#ifdef ALPHA_TLASER
if ((MCSR_SP(ipr[AlphaISA::IPR_MCSR]) & 2) &&
- VA_SPACE(req->vaddr) == 2) {
+ VA_SPACE_EV5(req->vaddr) == 2) {
+#else
+ if (VA_SPACE_EV6(req->vaddr) == 0x7e) {
+#endif
+
// only valid in kernel mode
if (ICM_CM(ipr[AlphaISA::IPR_ICM]) != AlphaISA::mode_kernel) {
}
req->paddr = req->vaddr & PA_IMPL_MASK;
+
+#ifndef ALPHA_TLASER
+ // sign extend the physical address properly
+ if (req->paddr & PA_UNCACHED_BIT_40)
+ req->paddr |= ULL(0xf0000000000);
+ else
+ req->paddr &= ULL(0xffffffffff);
+#endif
+
} else {
// not a physical address: need to look up pte
AlphaISA::PTE *pte = lookup(VA_VPN(req->vaddr),
}
void
-AlphaDTB::fault(Addr vaddr, uint64_t flags, ExecContext *xc) const
+AlphaDTB::fault(MemReqPtr &req, uint64_t flags) const
{
+ ExecContext *xc = req->xc;
+ Addr vaddr = req->vaddr;
uint64_t *ipr = xc->regs.ipr;
- // set fault address and flags
- if (!xc->misspeculating() && !xc->regs.intrlock) {
+ // Set fault address and flags. Even though we're modeling an
+ // EV5, we use the EV6 technique of not latching fault registers
+ // on VPTE loads (instead of locking the registers until IPR_VA is
+ // read, like the EV5). The EV6 approach is cleaner and seems to
+ // work with EV5 PAL code, but not the other way around.
+ if (!xc->misspeculating()
+ && !(req->flags & VPTE) && !(req->flags & NO_FAULT)) {
// set VA register with faulting address
ipr[AlphaISA::IPR_VA] = vaddr;
// set MM_STAT register flags
- ipr[AlphaISA::IPR_MM_STAT] = (((xc->regs.opcode & 0x3f) << 11)
- | ((xc->regs.ra & 0x1f) << 6)
+ ipr[AlphaISA::IPR_MM_STAT] = (((OPCODE(xc->getInst()) & 0x3f) << 11)
+ | ((RA(xc->getInst()) & 0x1f) << 6)
| (flags & 0x3f));
// set VA_FORM register with faulting formatted address
ipr[AlphaISA::IPR_VA_FORM] =
ipr[AlphaISA::IPR_MVPTBR] | (VA_VPN(vaddr) << 3);
-
- // lock these registers until the VA register is read
- xc->regs.intrlock = true;
}
}
} else {
// verify that this is a good virtual address
if (!validVirtualAddress(req->vaddr)) {
- fault(req->vaddr,
- ((write ? MM_STAT_WR_MASK : 0) | MM_STAT_BAD_VA_MASK |
- MM_STAT_ACV_MASK),
- req->xc);
+ fault(req, ((write ? MM_STAT_WR_MASK : 0) | MM_STAT_BAD_VA_MASK |
+ MM_STAT_ACV_MASK));
if (write) { write_acv++; } else { read_acv++; }
- return Dtb_Fault_Fault;
+ return DTB_Fault_Fault;
}
- // Check for "superpage" mapping: when SP<1> is set, and
- // VA<42:41> == 2, VA<39:13> maps directly to PA<39:13>.
+ // Check for "superpage" mapping
+#ifdef ALPHA_TLASER
if ((MCSR_SP(ipr[AlphaISA::IPR_MCSR]) & 2) &&
- VA_SPACE(req->vaddr) == 2) {
+ VA_SPACE_EV5(req->vaddr) == 2) {
+#else
+ if (VA_SPACE_EV6(req->vaddr) == 0x7e) {
+#endif
// only valid in kernel mode
if (DTB_CM_CM(ipr[AlphaISA::IPR_DTB_CM]) !=
AlphaISA::mode_kernel) {
- fault(req->vaddr,
- ((write ? MM_STAT_WR_MASK : 0) | MM_STAT_ACV_MASK),
- req->xc);
+ fault(req, ((write ? MM_STAT_WR_MASK : 0) | MM_STAT_ACV_MASK));
if (write) { write_acv++; } else { read_acv++; }
- return Dtb_Acv_Fault;
+ return DTB_Acv_Fault;
}
req->paddr = req->vaddr & PA_IMPL_MASK;
+
+#ifndef ALPHA_TLASER
+ // sign extend the physical address properly
+ if (req->paddr & PA_UNCACHED_BIT_40)
+ req->paddr |= ULL(0xf0000000000);
+ else
+ req->paddr &= ULL(0xffffffffff);
+#endif
+
} else {
if (write)
write_accesses++;
if (!pte) {
// page fault
- fault(req->vaddr,
- ((write ? MM_STAT_WR_MASK : 0) | MM_STAT_DTB_MISS_MASK),
- req->xc);
+ fault(req,
+ (write ? MM_STAT_WR_MASK : 0) | MM_STAT_DTB_MISS_MASK);
if (write) { write_misses++; } else { read_misses++; }
return (req->flags & VPTE) ? Pdtb_Miss_Fault : Ndtb_Miss_Fault;
}
if (write) {
if (!(pte->xwe & MODE2MASK(mode))) {
// declare the instruction access fault
- fault(req->vaddr, MM_STAT_WR_MASK | MM_STAT_ACV_MASK |
- (pte->fonw ? MM_STAT_FONW_MASK : 0),
- req->xc);
+ fault(req, (MM_STAT_WR_MASK | MM_STAT_ACV_MASK |
+ (pte->fonw ? MM_STAT_FONW_MASK : 0)));
write_acv++;
- return Dtb_Fault_Fault;
+ return DTB_Fault_Fault;
}
if (pte->fonw) {
- fault(req->vaddr, MM_STAT_WR_MASK | MM_STAT_FONW_MASK,
- req->xc);
+ fault(req, MM_STAT_WR_MASK | MM_STAT_FONW_MASK);
write_acv++;
- return Dtb_Fault_Fault;
+ return DTB_Fault_Fault;
}
} else {
if (!(pte->xre & MODE2MASK(mode))) {
- fault(req->vaddr,
- MM_STAT_ACV_MASK |
- (pte->fonr ? MM_STAT_FONR_MASK : 0),
- req->xc);
+ fault(req, (MM_STAT_ACV_MASK |
+ (pte->fonr ? MM_STAT_FONR_MASK : 0)));
read_acv++;
- return Dtb_Acv_Fault;
+ return DTB_Acv_Fault;
}
if (pte->fonr) {
- fault(req->vaddr, MM_STAT_FONR_MASK, req->xc);
+ fault(req, MM_STAT_FONR_MASK);
read_acv++;
- return Dtb_Fault_Fault;
+ return DTB_Fault_Fault;
}
}
}
return *pte;
}
+DEFINE_SIM_OBJECT_CLASS_NAME("AlphaTLB", AlphaTLB)
+
BEGIN_DECLARE_SIM_OBJECT_PARAMS(AlphaITB)
Param<int> size;
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