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28 * Authors: Ron Dreslinski
34 * @file Decleration of a request, the overall memory request consisting of
35 the parts of the request that are persistent throughout the transaction.
38 #ifndef __MEM_REQUEST_HH__
39 #define __MEM_REQUEST_HH__
41 #include "arch/isa_traits.hh"
45 typedef Request* RequestPtr;
48 /** The request is a Load locked/store conditional. */
49 const unsigned LOCKED = 0x001;
50 /** The virtual address is also the physical address. */
51 const unsigned PHYSICAL = 0x002;
52 /** The request is an ALPHA VPTE pal access (hw_ld). */
53 const unsigned VPTE = 0x004;
54 /** Use the alternate mode bits in ALPHA. */
55 const unsigned ALTMODE = 0x008;
56 /** The request is to an uncacheable address. */
57 const unsigned UNCACHEABLE = 0x010;
58 /** The request should not cause a page fault. */
59 const unsigned NO_FAULT = 0x020;
60 /** The request should be prefetched into the exclusive state. */
61 const unsigned PF_EXCLUSIVE = 0x100;
62 /** The request should be marked as LRU. */
63 const unsigned EVICT_NEXT = 0x200;
64 /** The request should ignore unaligned access faults */
65 const unsigned NO_ALIGN_FAULT = 0x400;
66 /** The request was an instruction read. */
67 const unsigned INST_READ = 0x800;
73 * The physical address of the request. Valid only if validPaddr
78 * The size of the request. This field must be set when vaddr or
79 * paddr is written via setVirt() or setPhys(), so it is always
80 * valid as long as one of the address fields is valid. */
83 /** Flag structure for the request. */
87 * The time this request was started. Used to calculate
88 * latencies. This field is set to curTick any time paddr or vaddr
92 /** The address space ID. */
94 /** The virtual address of the request. */
97 /** The return value of store conditional. */
100 /** The cpu number (for statistics, typically). */
102 /** The requesting thread id (for statistics, typically). */
105 /** program counter of initiating access; for tracing/debugging */
108 /** Whether or not paddr is valid (has been written yet). */
110 /** Whether or not the asid & vaddr are valid. */
112 /** Whether or not the sc result is valid. */
114 /** Whether or not the cpu number & thread ID are valid. */
115 bool validCpuAndThreadNums;
116 /** Whether or not the pc is valid. */
120 /** Minimal constructor. No fields are initialized. */
122 : validPaddr(false), validAsidVaddr(false),
123 validScResult(false), validCpuAndThreadNums(false), validPC(false)
127 * Constructor for physical (e.g. device) requests. Initializes
128 * just physical address, size, flags, and timestamp (to curTick).
129 * These fields are adequate to perform a request. */
130 Request(Addr _paddr, int _size, int _flags)
131 : validCpuAndThreadNums(false)
132 { setPhys(_paddr, _size, _flags); }
134 Request(int _asid, Addr _vaddr, int _size, int _flags, Addr _pc,
135 int _cpuNum, int _threadNum)
137 setThreadContext(_cpuNum, _threadNum);
138 setVirt(_asid, _vaddr, _size, _flags, _pc);
142 * Set up CPU and thread numbers. */
143 void setThreadContext(int _cpuNum, int _threadNum)
146 threadNum = _threadNum;
147 validCpuAndThreadNums = true;
151 * Set up a physical (e.g. device) request in a previously
152 * allocated Request object. */
153 void setPhys(Addr _paddr, int _size, int _flags)
160 validAsidVaddr = false;
162 validScResult = false;
166 * Set up a virtual (e.g., CPU) request in a previously
167 * allocated Request object. */
168 void setVirt(int _asid, Addr _vaddr, int _size, int _flags, Addr _pc)
177 validAsidVaddr = true;
179 validScResult = false;
182 /** Set just the physical address. This should only be used to
183 * record the result of a translation, and thus the vaddr must be
184 * valid before this method is called. Otherwise, use setPhys()
185 * to guarantee that the size and flags are also set.
187 void setPaddr(Addr _paddr)
189 assert(validAsidVaddr);
194 /** Accessor for paddr. */
195 Addr getPaddr() { assert(validPaddr); return paddr; }
197 /** Accessor for size. */
198 int getSize() { assert(validPaddr || validAsidVaddr); return size; }
199 /** Accessor for time. */
200 Tick getTime() { assert(validPaddr || validAsidVaddr); return time; }
202 /** Accessor for flags. */
203 uint32_t getFlags() { assert(validPaddr || validAsidVaddr); return flags; }
204 /** Accessor for paddr. */
205 void setFlags(uint32_t _flags)
206 { assert(validPaddr || validAsidVaddr); flags = _flags; }
208 /** Accessor function for vaddr.*/
209 Addr getVaddr() { assert(validAsidVaddr); return vaddr; }
211 /** Accessor function for asid.*/
212 int getAsid() { assert(validAsidVaddr); return asid; }
214 /** Accessor function to check if sc result is valid. */
215 bool scResultValid() { return validScResult; }
216 /** Accessor function for store conditional return value.*/
217 uint64_t getScResult() { assert(validScResult); return scResult; }
218 /** Accessor function for store conditional return value.*/
219 void setScResult(uint64_t _scResult)
220 { scResult = _scResult; validScResult = true; }
222 /** Accessor function for cpu number.*/
223 int getCpuNum() { assert(validCpuAndThreadNums); return cpuNum; }
224 /** Accessor function for thread number.*/
225 int getThreadNum() { assert(validCpuAndThreadNums); return threadNum; }
227 /** Accessor function for pc.*/
228 Addr getPC() { assert(validPC); return pc; }
230 /** Accessor Function to Check Cacheability. */
231 bool isUncacheable() { return getFlags() & UNCACHEABLE; }
233 bool isInstRead() { return getFlags() & INST_READ; }
238 #endif // __MEM_REQUEST_HH__