isa_traits.hh revision 7811
1/* 2 * Copyright (c) 2003-2005 The Regents of The University of Michigan 3 * Copyright (c) 2007 MIPS Technologies, Inc. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer; 10 * redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution; 13 * neither the name of the copyright holders nor the names of its 14 * contributors may be used to endorse or promote products derived from 15 * this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * Authors: Gabe Black 30 * Korey Sewell 31 * Jaidev Patwardhan 32 */ 33 34#ifndef __ARCH_MIPS_ISA_TRAITS_HH__ 35#define __ARCH_MIPS_ISA_TRAITS_HH__ 36 37#include "arch/mips/types.hh" 38#include "arch/mips/mips_core_specific.hh" 39#include "base/types.hh" 40#include "config/full_system.hh" 41 42namespace LittleEndianGuest {} 43 44class StaticInstPtr; 45 46namespace MipsISA 47{ 48 49using namespace LittleEndianGuest; 50 51StaticInstPtr decodeInst(ExtMachInst); 52 53// MIPS DOES have a delay slot 54#define ISA_HAS_DELAY_SLOT 1 55 56const Addr PageShift = 13; 57const Addr PageBytes = ULL(1) << PageShift; 58const Addr Page_Mask = ~(PageBytes - 1); 59const Addr PageOffset = PageBytes - 1; 60 61 62//////////////////////////////////////////////////////////////////////// 63// 64// Translation stuff 65// 66 67const Addr PteShift = 3; 68const Addr NPtePageShift = PageShift - PteShift; 69const Addr NPtePage = ULL(1) << NPtePageShift; 70const Addr PteMask = NPtePage - 1; 71 72//// All 'Mapped' segments go through the TLB 73//// All other segments are translated by dropping the MSB, to give 74//// the corresponding physical address 75// User Segment - Mapped 76const Addr USegBase = ULL(0x0); 77const Addr USegEnd = ULL(0x7FFFFFFF); 78 79// Kernel Segment 0 - Unmapped 80const Addr KSeg0End = ULL(0x9FFFFFFF); 81const Addr KSeg0Base = ULL(0x80000000); 82const Addr KSeg0Mask = ULL(0x1FFFFFFF); 83 84// Kernel Segment 1 - Unmapped, Uncached 85const Addr KSeg1End = ULL(0xBFFFFFFF); 86const Addr KSeg1Base = ULL(0xA0000000); 87const Addr KSeg1Mask = ULL(0x1FFFFFFF); 88 89// Kernel/Supervisor Segment - Mapped 90const Addr KSSegEnd = ULL(0xDFFFFFFF); 91const Addr KSSegBase = ULL(0xC0000000); 92 93// Kernel Segment 3 - Mapped 94const Addr KSeg3End = ULL(0xFFFFFFFF); 95const Addr KSeg3Base = ULL(0xE0000000); 96 97 98inline Addr Phys2K0Seg(Addr addr) 99{ 100 return addr | KSeg0Base; 101} 102 103 104const unsigned VABits = 32; 105const unsigned PABits = 32; // Is this correct? 106const Addr VAddrImplMask = (ULL(1) << VABits) - 1; 107const Addr VAddrUnImplMask = ~VAddrImplMask; 108inline Addr VAddrImpl(Addr a) { return a & VAddrImplMask; } 109inline Addr VAddrVPN(Addr a) { return a >> MipsISA::PageShift; } 110inline Addr VAddrOffset(Addr a) { return a & MipsISA::PageOffset; } 111 112const Addr PAddrImplMask = (ULL(1) << PABits) - 1; 113 114//////////////////////////////////////////////////////////////////////// 115// 116// Interrupt levels 117// 118enum InterruptLevels 119{ 120 INTLEVEL_SOFTWARE_MIN = 4, 121 INTLEVEL_SOFTWARE_MAX = 19, 122 123 INTLEVEL_EXTERNAL_MIN = 20, 124 INTLEVEL_EXTERNAL_MAX = 34, 125 126 INTLEVEL_IRQ0 = 20, 127 INTLEVEL_IRQ1 = 21, 128 INTINDEX_ETHERNET = 0, 129 INTINDEX_SCSI = 1, 130 INTLEVEL_IRQ2 = 22, 131 INTLEVEL_IRQ3 = 23, 132 133 INTLEVEL_SERIAL = 33, 134 135 NumInterruptLevels = INTLEVEL_EXTERNAL_MAX 136}; 137 138// MIPS modes 139enum mode_type 140{ 141 mode_kernel = 0, // kernel 142 mode_supervisor = 1, // supervisor 143 mode_user = 2, // user mode 144 mode_debug = 3, // debug mode 145 mode_number // number of modes 146}; 147 148// return a no-op instruction... used for instruction fetch faults 149const ExtMachInst NoopMachInst = 0x00000000; 150 151const int LogVMPageSize = 13; // 8K bytes 152const int VMPageSize = (1 << LogVMPageSize); 153 154const int BranchPredAddrShiftAmt = 2; // instructions are 4-byte aligned 155 156const int MachineBytes = 4; 157const int WordBytes = 4; 158const int HalfwordBytes = 2; 159const int ByteBytes = 1; 160 161const int ANNOTE_NONE = 0; 162const uint32_t ITOUCH_ANNOTE = 0xffffffff; 163 164// Memory accesses cannot be unaligned 165const bool HasUnalignedMemAcc = false; 166 167} // namespace MipsISA 168 169#endif // __ARCH_MIPS_ISA_TRAITS_HH__ 170