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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 not cause a page fault. */
76 static const FlagsType NO_FAULT = 0x00010000;
77 /** The request should ignore unaligned access faults */
78 static const FlagsType NO_ALIGN_FAULT = 0x00020000;
79 /** The request should ignore unaligned access faults */
80 static const FlagsType NO_HALF_WORD_ALIGN_FAULT = 0x00040000;
81 /** The request should not cause a memory access. */
82 static const FlagsType NO_ACCESS = 0x00080000;
83 /** This request will lock or unlock the accessed memory. When used with
84 * a load, the access locks the particular chunk of memory. When used
85 * with a store, it unlocks. The rule is that locked accesses have to be
86 * made up of a locked load, some operation on the data, and then a locked
89 static const FlagsType LOCKED = 0x00100000;
90 /** The request is a Load locked/store conditional. */
91 static const FlagsType LLSC = 0x00200000;
92 /** This request is for a memory swap. */
93 static const FlagsType MEM_SWAP = 0x00400000;
94 static const FlagsType MEM_SWAP_COND = 0x00800000;
96 /** The request is a prefetch. */
97 static const FlagsType PREFETCH = 0x01000000;
98 /** The request should be prefetched into the exclusive state. */
99 static const FlagsType PF_EXCLUSIVE = 0x02000000;
100 /** The request should be marked as LRU. */
101 static const FlagsType EVICT_NEXT = 0x04000000;
103 /** These flags are *not* cleared when a Request object is reused
104 (assigned a new address). */
105 static const FlagsType STICKY_FLAGS = INST_FETCH;
108 typedef uint8_t PrivateFlagsType;
109 typedef ::Flags<PrivateFlagsType> PrivateFlags;
111 /** Whether or not the size is valid. */
112 static const PrivateFlagsType VALID_SIZE = 0x00000001;
113 /** Whether or not paddr is valid (has been written yet). */
114 static const PrivateFlagsType VALID_PADDR = 0x00000002;
115 /** Whether or not the vaddr & asid are valid. */
116 static const PrivateFlagsType VALID_VADDR = 0x00000004;
117 /** Whether or not the pc is valid. */
118 static const PrivateFlagsType VALID_PC = 0x00000010;
119 /** Whether or not the context ID is valid. */
120 static const PrivateFlagsType VALID_CONTEXT_ID = 0x00000020;
121 static const PrivateFlagsType VALID_THREAD_ID = 0x00000040;
122 /** Whether or not the sc result is valid. */
123 static const PrivateFlagsType VALID_EXTRA_DATA = 0x00000080;
125 /** These flags are *not* cleared when a Request object is reused
126 (assigned a new address). */
127 static const PrivateFlagsType STICKY_PRIVATE_FLAGS =
128 VALID_CONTEXT_ID | VALID_THREAD_ID;
132 * The physical address of the request. Valid only if validPaddr
138 * The size of the request. This field must be set when vaddr or
139 * paddr is written via setVirt() or setPhys(), so it is always
140 * valid as long as one of the address fields is valid.
144 /** Flag structure for the request. */
147 /** Private flags for field validity checking. */
148 PrivateFlags privateFlags;
151 * The time this request was started. Used to calculate
152 * latencies. This field is set to curTick any time paddr or vaddr
157 /** The address space ID. */
160 /** The virtual address of the request. */
164 * Extra data for the request, such as the return value of
165 * store conditional or the compare value for a CAS. */
168 /** The context ID (for statistics, typically). */
170 /** The thread ID (id within this CPU) */
173 /** program counter of initiating access; for tracing/debugging */
177 /** Minimal constructor. No fields are initialized. */
182 * Constructor for physical (e.g. device) requests. Initializes
183 * just physical address, size, flags, and timestamp (to curTick).
184 * These fields are adequate to perform a request.
186 Request(Addr paddr, int size, Flags flags)
188 setPhys(paddr, size, flags);
191 Request(Addr paddr, int size, Flags flags, Tick time)
193 setPhys(paddr, size, flags, time);
196 Request(int asid, Addr vaddr, int size, Flags flags, Addr pc,
197 int cid, ThreadID tid)
199 setVirt(asid, vaddr, size, flags, pc);
200 setThreadContext(cid, tid);
203 ~Request() {} // for FastAlloc
206 * Set up CPU and thread numbers.
209 setThreadContext(int context_id, ThreadID tid)
211 _contextId = context_id;
213 privateFlags.set(VALID_CONTEXT_ID|VALID_THREAD_ID);
217 * Set up a physical (e.g. device) request in a previously
218 * allocated Request object.
221 setPhys(Addr _paddr, int _size, Flags _flags, Tick time)
228 flags.clear(~STICKY_FLAGS);
230 privateFlags.clear(~STICKY_PRIVATE_FLAGS);
231 privateFlags.set(VALID_PADDR|VALID_SIZE);
235 setPhys(Addr _paddr, int _size, Flags _flags)
237 setPhys(_paddr, _size, _flags, curTick);
241 * Set up a virtual (e.g., CPU) request in a previously
242 * allocated Request object.
245 setVirt(int _asid, Addr _vaddr, int _size, Flags _flags, Addr _pc)
255 flags.clear(~STICKY_FLAGS);
257 privateFlags.clear(~STICKY_PRIVATE_FLAGS);
258 privateFlags.set(VALID_VADDR|VALID_SIZE|VALID_PC);
262 * Set just the physical address. This should only be used to
263 * record the result of a translation, and thus the vaddr must be
264 * valid before this method is called. Otherwise, use setPhys()
265 * to guarantee that the size and flags are also set.
268 setPaddr(Addr _paddr)
270 assert(privateFlags.isSet(VALID_VADDR));
272 privateFlags.set(VALID_PADDR);
276 * Generate two requests as if this request had been split into two
277 * pieces. The original request can't have been translated already.
279 void splitOnVaddr(Addr split_addr, RequestPtr &req1, RequestPtr &req2)
281 assert(privateFlags.isSet(VALID_VADDR));
282 assert(privateFlags.noneSet(VALID_PADDR));
283 assert(split_addr > vaddr && split_addr < vaddr + size);
288 req1->size = split_addr - vaddr;
289 req2->vaddr = split_addr;
290 req2->size = size - req1->size;
294 * Accessor for paddr.
299 return privateFlags.isSet(VALID_PADDR);
305 assert(privateFlags.isSet(VALID_PADDR));
315 return privateFlags.isSet(VALID_SIZE);
321 assert(privateFlags.isSet(VALID_SIZE));
325 /** Accessor for time. */
329 assert(privateFlags.isSet(VALID_PADDR|VALID_VADDR));
336 assert(privateFlags.isSet(VALID_PADDR|VALID_VADDR));
340 /** Accessor for flags. */
344 assert(privateFlags.isSet(VALID_PADDR|VALID_VADDR));
349 setFlags(Flags _flags)
351 assert(privateFlags.isSet(VALID_PADDR|VALID_VADDR));
355 /** Accessor function for vaddr.*/
359 assert(privateFlags.isSet(VALID_VADDR));
363 /** Accessor function for asid.*/
367 assert(privateFlags.isSet(VALID_VADDR));
371 /** Accessor function for asi.*/
375 assert(privateFlags.isSet(VALID_VADDR));
376 return flags & ASI_BITS;
379 /** Accessor function for MMAPED_IPR flag. */
383 assert(privateFlags.isSet(VALID_PADDR));
384 return flags.isSet(MMAPED_IPR);
391 flags.set(MMAPED_IPR);
394 /** Accessor function to check if sc result is valid. */
398 return privateFlags.isSet(VALID_EXTRA_DATA);
401 /** Accessor function for store conditional return value.*/
405 assert(privateFlags.isSet(VALID_EXTRA_DATA));
409 /** Accessor function for store conditional return value.*/
411 setExtraData(uint64_t _extraData)
413 extraData = _extraData;
414 privateFlags.set(VALID_EXTRA_DATA);
420 return privateFlags.isSet(VALID_CONTEXT_ID);
423 /** Accessor function for context ID.*/
427 assert(privateFlags.isSet(VALID_CONTEXT_ID));
431 /** Accessor function for thread ID. */
435 assert(privateFlags.isSet(VALID_THREAD_ID));
442 return privateFlags.isSet(VALID_PC);
445 /** Accessor function for pc.*/
449 assert(privateFlags.isSet(VALID_PC));
453 /** Accessor Function to Check Cacheability. */
454 bool isUncacheable() const { return flags.isSet(UNCACHEABLE); }
455 bool isInstFetch() const { return flags.isSet(INST_FETCH); }
456 bool isPrefetch() const { return flags.isSet(PREFETCH); }
457 bool isLLSC() const { return flags.isSet(LLSC); }
458 bool isLocked() const { return flags.isSet(LOCKED); }
459 bool isSwap() const { return flags.isSet(MEM_SWAP|MEM_SWAP_COND); }
460 bool isCondSwap() const { return flags.isSet(MEM_SWAP_COND); }
465 if (flags.isSet(NO_ALIGN_FAULT))
471 if (flags.isSet(NO_HALF_WORD_ALIGN_FAULT))
481 #endif // __MEM_REQUEST_HH__