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28 * Authors: Ron Dreslinski
35 * Declaration of a request, the overall memory request consisting of
36 the parts of the request that are persistent throughout the transaction.
39 #ifndef __MEM_REQUEST_HH__
40 #define __MEM_REQUEST_HH__
44 #include "base/fast_alloc.hh"
45 #include "base/flags.hh"
46 #include "base/misc.hh"
47 #include "base/types.hh"
48 #include "sim/core.hh"
52 typedef Request* RequestPtr;
54 class Request : public FastAlloc
57 typedef uint32_t FlagsType;
58 typedef ::Flags<FlagsType> Flags;
60 /** ASI information for this request if it exists. */
61 static const FlagsType ASI_BITS = 0x000000FF;
62 /** The request was an instruction fetch. */
63 static const FlagsType INST_FETCH = 0x00000100;
64 /** The virtual address is also the physical address. */
65 static const FlagsType PHYSICAL = 0x00000200;
66 /** The request is an ALPHA VPTE pal access (hw_ld). */
67 static const FlagsType VPTE = 0x00000400;
68 /** Use the alternate mode bits in ALPHA. */
69 static const FlagsType ALTMODE = 0x00000800;
70 /** The request is to an uncacheable address. */
71 static const FlagsType UNCACHEABLE = 0x00001000;
72 /** This request is to a memory mapped register. */
73 static const FlagsType MMAPED_IPR = 0x00002000;
75 /** The request should ignore unaligned access faults */
76 static const FlagsType NO_ALIGN_FAULT = 0x00020000;
77 /** The request should ignore unaligned access faults */
78 static const FlagsType NO_HALF_WORD_ALIGN_FAULT = 0x00040000;
79 /** The request should not cause a memory access. */
80 static const FlagsType NO_ACCESS = 0x00080000;
81 /** This request will lock or unlock the accessed memory. When used with
82 * a load, the access locks the particular chunk of memory. When used
83 * with a store, it unlocks. The rule is that locked accesses have to be
84 * made up of a locked load, some operation on the data, and then a locked
87 static const FlagsType LOCKED = 0x00100000;
88 /** The request is a Load locked/store conditional. */
89 static const FlagsType LLSC = 0x00200000;
90 /** This request is for a memory swap. */
91 static const FlagsType MEM_SWAP = 0x00400000;
92 static const FlagsType MEM_SWAP_COND = 0x00800000;
94 /** The request is a prefetch. */
95 static const FlagsType PREFETCH = 0x01000000;
96 /** The request should be prefetched into the exclusive state. */
97 static const FlagsType PF_EXCLUSIVE = 0x02000000;
98 /** The request should be marked as LRU. */
99 static const FlagsType EVICT_NEXT = 0x04000000;
101 /** These flags are *not* cleared when a Request object is reused
102 (assigned a new address). */
103 static const FlagsType STICKY_FLAGS = INST_FETCH;
106 typedef uint8_t PrivateFlagsType;
107 typedef ::Flags<PrivateFlagsType> PrivateFlags;
109 /** Whether or not the size is valid. */
110 static const PrivateFlagsType VALID_SIZE = 0x00000001;
111 /** Whether or not paddr is valid (has been written yet). */
112 static const PrivateFlagsType VALID_PADDR = 0x00000002;
113 /** Whether or not the vaddr & asid are valid. */
114 static const PrivateFlagsType VALID_VADDR = 0x00000004;
115 /** Whether or not the pc is valid. */
116 static const PrivateFlagsType VALID_PC = 0x00000010;
117 /** Whether or not the context ID is valid. */
118 static const PrivateFlagsType VALID_CONTEXT_ID = 0x00000020;
119 static const PrivateFlagsType VALID_THREAD_ID = 0x00000040;
120 /** Whether or not the sc result is valid. */
121 static const PrivateFlagsType VALID_EXTRA_DATA = 0x00000080;
123 /** These flags are *not* cleared when a Request object is reused
124 (assigned a new address). */
125 static const PrivateFlagsType STICKY_PRIVATE_FLAGS =
126 VALID_CONTEXT_ID | VALID_THREAD_ID;
130 * The physical address of the request. Valid only if validPaddr
136 * The size of the request. This field must be set when vaddr or
137 * paddr is written via setVirt() or setPhys(), so it is always
138 * valid as long as one of the address fields is valid.
142 /** Flag structure for the request. */
145 /** Private flags for field validity checking. */
146 PrivateFlags privateFlags;
149 * The time this request was started. Used to calculate
150 * latencies. This field is set to curTick any time paddr or vaddr
155 /** The address space ID. */
158 /** The virtual address of the request. */
162 * Extra data for the request, such as the return value of
163 * store conditional or the compare value for a CAS. */
166 /** The context ID (for statistics, typically). */
168 /** The thread ID (id within this CPU) */
171 /** program counter of initiating access; for tracing/debugging */
175 /** Minimal constructor. No fields are initialized.
176 * (Note that _flags and privateFlags are cleared by Flags
177 * default constructor.)
183 * Constructor for physical (e.g. device) requests. Initializes
184 * just physical address, size, flags, and timestamp (to curTick).
185 * These fields are adequate to perform a request.
187 Request(Addr paddr, int size, Flags flags)
189 setPhys(paddr, size, flags);
192 Request(Addr paddr, int size, Flags flags, Tick time)
194 setPhys(paddr, size, flags, time);
197 Request(Addr paddr, int size, Flags flags, Tick time, Addr pc)
199 setPhys(paddr, size, flags, time);
200 privateFlags.set(VALID_PC);
204 Request(int asid, Addr vaddr, int size, Flags flags, Addr pc,
205 int cid, ThreadID tid)
207 setVirt(asid, vaddr, size, flags, pc);
208 setThreadContext(cid, tid);
211 ~Request() {} // for FastAlloc
214 * Set up CPU and thread numbers.
217 setThreadContext(int context_id, ThreadID tid)
219 _contextId = context_id;
221 privateFlags.set(VALID_CONTEXT_ID|VALID_THREAD_ID);
225 * Set up a physical (e.g. device) request in a previously
226 * allocated Request object.
229 setPhys(Addr paddr, int size, Flags flags, Tick time)
236 _flags.clear(~STICKY_FLAGS);
238 privateFlags.clear(~STICKY_PRIVATE_FLAGS);
239 privateFlags.set(VALID_PADDR|VALID_SIZE);
243 setPhys(Addr paddr, int size, Flags flags)
245 setPhys(paddr, size, flags, curTick);
249 * Set up a virtual (e.g., CPU) request in a previously
250 * allocated Request object.
253 setVirt(int asid, Addr vaddr, int size, Flags flags, Addr pc)
262 _flags.clear(~STICKY_FLAGS);
264 privateFlags.clear(~STICKY_PRIVATE_FLAGS);
265 privateFlags.set(VALID_VADDR|VALID_SIZE|VALID_PC);
269 * Set just the physical address. This should only be used to
270 * record the result of a translation, and thus the vaddr must be
271 * valid before this method is called. Otherwise, use setPhys()
272 * to guarantee that the size and flags are also set.
277 assert(privateFlags.isSet(VALID_VADDR));
279 privateFlags.set(VALID_PADDR);
283 * Generate two requests as if this request had been split into two
284 * pieces. The original request can't have been translated already.
286 void splitOnVaddr(Addr split_addr, RequestPtr &req1, RequestPtr &req2)
288 assert(privateFlags.isSet(VALID_VADDR));
289 assert(privateFlags.noneSet(VALID_PADDR));
290 assert(split_addr > _vaddr && split_addr < _vaddr + _size);
295 req1->_size = split_addr - _vaddr;
296 req2->_vaddr = split_addr;
297 req2->_size = _size - req1->_size;
301 * Accessor for paddr.
306 return privateFlags.isSet(VALID_PADDR);
312 assert(privateFlags.isSet(VALID_PADDR));
322 return privateFlags.isSet(VALID_SIZE);
328 assert(privateFlags.isSet(VALID_SIZE));
332 /** Accessor for time. */
336 assert(privateFlags.isSet(VALID_PADDR|VALID_VADDR));
343 assert(privateFlags.isSet(VALID_PADDR|VALID_VADDR));
347 /** Accessor for flags. */
351 assert(privateFlags.isSet(VALID_PADDR|VALID_VADDR));
355 /** Note that unlike other accessors, this function sets *specific
356 flags* (ORs them in); it does not assign its argument to the
357 _flags field. Thus this method should rightly be called
358 setFlags() and not just flags(). */
360 setFlags(Flags flags)
362 assert(privateFlags.isSet(VALID_PADDR|VALID_VADDR));
366 /** Accessor function for vaddr.*/
370 assert(privateFlags.isSet(VALID_VADDR));
374 /** Accessor function for asid.*/
378 assert(privateFlags.isSet(VALID_VADDR));
382 /** Accessor function for asi.*/
386 assert(privateFlags.isSet(VALID_VADDR));
387 return _flags & ASI_BITS;
390 /** Accessor function to check if sc result is valid. */
394 return privateFlags.isSet(VALID_EXTRA_DATA);
397 /** Accessor function for store conditional return value.*/
401 assert(privateFlags.isSet(VALID_EXTRA_DATA));
405 /** Accessor function for store conditional return value.*/
407 setExtraData(uint64_t extraData)
409 _extraData = extraData;
410 privateFlags.set(VALID_EXTRA_DATA);
416 return privateFlags.isSet(VALID_CONTEXT_ID);
419 /** Accessor function for context ID.*/
423 assert(privateFlags.isSet(VALID_CONTEXT_ID));
427 /** Accessor function for thread ID. */
431 assert(privateFlags.isSet(VALID_THREAD_ID));
438 return privateFlags.isSet(VALID_PC);
441 /** Accessor function for pc.*/
445 assert(privateFlags.isSet(VALID_PC));
449 /** Accessor functions for flags. Note that these are for testing
450 only; setting flags should be done via setFlags(). */
451 bool isUncacheable() const { return _flags.isSet(UNCACHEABLE); }
452 bool isInstFetch() const { return _flags.isSet(INST_FETCH); }
453 bool isPrefetch() const { return _flags.isSet(PREFETCH); }
454 bool isLLSC() const { return _flags.isSet(LLSC); }
455 bool isLocked() const { return _flags.isSet(LOCKED); }
456 bool isSwap() const { return _flags.isSet(MEM_SWAP|MEM_SWAP_COND); }
457 bool isCondSwap() const { return _flags.isSet(MEM_SWAP_COND); }
458 bool isMmapedIpr() const { return _flags.isSet(MMAPED_IPR); }
463 if (_flags.isSet(NO_ALIGN_FAULT))
469 if (_flags.isSet(NO_HALF_WORD_ALIGN_FAULT))
479 #endif // __MEM_REQUEST_HH__