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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;
47 /** The request is a Load locked/store conditional. */
48 const unsigned LOCKED = 0x001;
49 /** The virtual address is also the physical address. */
50 const unsigned PHYSICAL = 0x002;
51 /** The request is an ALPHA VPTE pal access (hw_ld). */
52 const unsigned VPTE = 0x004;
53 /** Use the alternate mode bits in ALPHA. */
54 const unsigned ALTMODE = 0x008;
55 /** The request is to an uncacheable address. */
56 const unsigned UNCACHEABLE = 0x010;
57 /** The request should not cause a page fault. */
58 const unsigned NO_FAULT = 0x020;
59 /** The request should be prefetched into the exclusive state. */
60 const unsigned PF_EXCLUSIVE = 0x100;
61 /** The request should be marked as LRU. */
62 const unsigned EVICT_NEXT = 0x200;
63 /** The request should ignore unaligned access faults */
64 const unsigned NO_ALIGN_FAULT = 0x400;
70 * The physical address of the request. Valid only if validPaddr
75 * The size of the request. This field must be set when vaddr or
76 * paddr is written via setVirt() or setPhys(), so it is always
77 * valid as long as one of the address fields is valid. */
80 /** Flag structure for the request. */
84 * The time this request was started. Used to calculate
85 * latencies. This field is set to curTick any time paddr or vaddr
89 /** The address space ID. */
91 /** The virtual address of the request. */
94 /** The return value of store conditional. */
97 /** The cpu number (for statistics, typically). */
99 /** The requesting thread id (for statistics, typically). */
102 /** program counter of initiating access; for tracing/debugging */
105 /** Whether or not paddr is valid (has been written yet). */
107 /** Whether or not the asid & vaddr are valid. */
109 /** Whether or not the sc result is valid. */
111 /** Whether or not the cpu number & thread ID are valid. */
112 bool validCpuAndThreadNums;
113 /** Whether or not the pc is valid. */
117 /** Minimal constructor. No fields are initialized. */
119 : validPaddr(false), validAsidVaddr(false),
120 validScResult(false), validCpuAndThreadNums(false), validPC(false)
124 * Constructor for physical (e.g. device) requests. Initializes
125 * just physical address, size, flags, and timestamp (to curTick).
126 * These fields are adequate to perform a request. */
127 Request(Addr _paddr, int _size, int _flags)
128 : validCpuAndThreadNums(false)
129 { setPhys(_paddr, _size, _flags); }
131 Request(int _asid, Addr _vaddr, int _size, int _flags, Addr _pc,
132 int _cpuNum, int _threadNum)
134 setThreadContext(_cpuNum, _threadNum);
135 setVirt(_asid, _vaddr, _size, _flags, _pc);
139 * Set up CPU and thread numbers. */
140 void setThreadContext(int _cpuNum, int _threadNum)
143 threadNum = _threadNum;
144 validCpuAndThreadNums = true;
148 * Set up a physical (e.g. device) request in a previously
149 * allocated Request object. */
150 void setPhys(Addr _paddr, int _size, int _flags)
157 validAsidVaddr = false;
159 validScResult = false;
163 * Set up a virtual (e.g., CPU) request in a previously
164 * allocated Request object. */
165 void setVirt(int _asid, Addr _vaddr, int _size, int _flags, Addr _pc)
174 validAsidVaddr = true;
176 validScResult = false;
179 /** Set just the physical address. This should only be used to
180 * record the result of a translation, and thus the vaddr must be
181 * valid before this method is called. Otherwise, use setPhys()
182 * to guarantee that the size and flags are also set.
184 void setPaddr(Addr _paddr)
186 assert(validAsidVaddr);
191 /** Accessor for paddr. */
192 Addr getPaddr() { assert(validPaddr); return paddr; }
194 /** Accessor for size. */
195 int getSize() { assert(validPaddr || validAsidVaddr); return size; }
196 /** Accessor for time. */
197 Tick getTime() { assert(validPaddr || validAsidVaddr); return time; }
199 /** Accessor for flags. */
200 uint32_t getFlags() { assert(validPaddr || validAsidVaddr); return flags; }
201 /** Accessor for paddr. */
202 void setFlags(uint32_t _flags)
203 { assert(validPaddr || validAsidVaddr); flags = _flags; }
205 /** Accessor function for vaddr.*/
206 Addr getVaddr() { assert(validAsidVaddr); return vaddr; }
208 /** Accessor function for asid.*/
209 int getAsid() { assert(validAsidVaddr); return asid; }
211 /** Accessor function to check if sc result is valid. */
212 bool scResultValid() { return validScResult; }
213 /** Accessor function for store conditional return value.*/
214 uint64_t getScResult() { assert(validScResult); return scResult; }
215 /** Accessor function for store conditional return value.*/
216 void setScResult(uint64_t _scResult)
217 { scResult = _scResult; validScResult = true; }
219 /** Accessor function for cpu number.*/
220 int getCpuNum() { assert(validCpuAndThreadNums); return cpuNum; }
221 /** Accessor function for thread number.*/
222 int getThreadNum() { assert(validCpuAndThreadNums); return threadNum; }
224 /** Accessor function for pc.*/
225 Addr getPC() { assert(validPC); return pc; }
230 #endif // __MEM_REQUEST_HH__