1/*
2 * Copyright (c) 2002-2005 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;

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56const unsigned PF_EXCLUSIVE = 0x100;
57/** The request should be marked as LRU. */
58const unsigned EVICT_NEXT = 0x200;
59/** The request should ignore unaligned access faults */
60const unsigned NO_ALIGN_FAULT = 0x400;
61
62class Request
63{
64 private:
65 /**
66 * The physical address of the request. Valid only if validPaddr
67 * is set. */
68 Addr paddr;
69
70 /**
71 * The size of the request. This field must be set when vaddr or
72 * paddr is written via setVirt() or setPhys(), so it is always
73 * valid as long as one of the address fields is valid. */
74 int size;
75
76 /** Flag structure for the request. */
77 uint32_t flags;
78
79 /**
80 * The time this request was started. Used to calculate
81 * latencies. This field is set to curTick any time paddr or vaddr
82 * is written. */
83 Tick time;
84
85 /** The address space ID. */
86 int asid;
87 /** The virtual address of the request. */
88 Addr vaddr;
89
90 /** The return value of store conditional. */
91 uint64_t scResult;
92
93 /** The cpu number (for statistics, typically). */
94 int cpuNum;
95 /** The requesting thread id (for statistics, typically). */
96 int threadNum;
97
98 /** program counter of initiating access; for tracing/debugging */
99 Addr pc;
100
101 /** Whether or not paddr is valid (has been written yet). */
102 bool validPaddr;
103 /** Whether or not the asid & vaddr are valid. */
104 bool validAsidVaddr;
105 /** Whether or not the sc result is valid. */
106 bool validScResult;
107 /** Whether or not the cpu number & thread ID are valid. */
108 bool validCpuAndThreadNums;
109 /** Whether or not the pc is valid. */
110 bool validPC;
111
112 public:
113 /** Minimal constructor. No fields are initialized. */
114 Request()
115 : validPaddr(false), validAsidVaddr(false),
116 validScResult(false), validCpuAndThreadNums(false), validPC(false)
117 {}
118
119 /**
120 * Constructor for physical (e.g. device) requests. Initializes
121 * just physical address, size, flags, and timestamp (to curTick).
122 * These fields are adequate to perform a request. */
123 Request(Addr _paddr, int _size, int _flags)
124 : validCpuAndThreadNums(false)
125 { setPhys(_paddr, _size, _flags); }
126
127 /**
128 * Set up CPU and thread numbers. */
129 void setThreadContext(int _cpuNum, int _threadNum)
130 {
131 cpuNum = _cpuNum;
132 threadNum = _threadNum;
133 validCpuAndThreadNums = true;
134 }
135
136 /**
137 * Set up a physical (e.g. device) request in a previously
138 * allocated Request object. */
139 void setPhys(Addr _paddr, int _size, int _flags)
140 {
141 paddr = _paddr;
142 size = _size;
143 flags = _flags;
144 time = curTick;
145 validPaddr = true;
146 validAsidVaddr = false;
147 validPC = false;
148 validScResult = false;
149 }
150
151 /**
152 * Set up a virtual (e.g., CPU) request in a previously
153 * allocated Request object. */
154 void setVirt(int _asid, Addr _vaddr, int _size, int _flags, Addr _pc)
155 {
156 asid = _asid;
157 vaddr = _vaddr;
158 size = _size;
159 flags = _flags;
160 pc = _pc;
161 time = curTick;
162 validPaddr = false;
163 validAsidVaddr = true;
164 validPC = true;
165 validScResult = false;
166 }
167
168 /** Set just the physical address. This should only be used to
169 * record the result of a translation, and thus the vaddr must be
170 * valid before this method is called. Otherwise, use setPhys()
171 * to guarantee that the size and flags are also set.
172 */
173 void setPaddr(Addr _paddr)
174 {
175 assert(validAsidVaddr);
176 paddr = _paddr;
177 validPaddr = true;
178 }
179
180 /** Accessor for paddr. */
181 Addr getPaddr() { assert(validPaddr); return paddr; }
182
183 /** Accessor for size. */
184 int getSize() { assert(validPaddr || validAsidVaddr); return size; }
185 /** Accessor for time. */
186 Tick getTime() { assert(validPaddr || validAsidVaddr); return time; }
187
188 /** Accessor for flags. */
189 uint32_t getFlags() { assert(validPaddr || validAsidVaddr); return flags; }
190 /** Accessor for paddr. */
191 void setFlags(uint32_t _flags)
192 { assert(validPaddr || validAsidVaddr); flags = _flags; }
193
194 /** Accessor function for vaddr.*/
195 Addr getVaddr() { assert(validAsidVaddr); return vaddr; }
196
197 /** Accessor function for asid.*/
198 int getAsid() { assert(validAsidVaddr); return asid; }
199
200 /** Accessor function for store conditional return value.*/
201 uint64_t getScResult() { assert(validScResult); return scResult; }
202 /** Accessor function for store conditional return value.*/
203 void setScResult(uint64_t _scResult)
204 { scResult = _scResult; validScResult = true; }
205
206 /** Accessor function for cpu number.*/
207 int getCpuNum() { assert(validCpuAndThreadNums); return cpuNum; }
208 /** Accessor function for thread number.*/
209 int getThreadNum() { assert(validCpuAndThreadNums); return threadNum; }
210
211 /** Accessor function for pc.*/
212 Addr getPC() { assert(validPC); return pc; }
213
214 friend class Packet;
215};
216
217#endif // __MEM_REQUEST_HH__