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; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Ron Dreslinski 29 * Steve Reinhardt 30 * Ali Saidi 31 */ 32 33/** 34 * @file 35 * Declaration of a request, the overall memory request consisting of 36 the parts of the request that are persistent throughout the transaction. 37 */ 38 39#ifndef __MEM_REQUEST_HH__ 40#define __MEM_REQUEST_HH__ 41 42#include <cassert> 43 44#include "base/fast_alloc.hh" 45#include "base/flags.hh"
|
46#include "base/misc.hh" |
47#include "sim/host.hh" 48#include "sim/core.hh" 49 50class Request; 51 52typedef Request* RequestPtr; 53 54class Request : public FastAlloc 55{ 56 public: 57 typedef uint32_t FlagsType; 58 typedef ::Flags<FlagsType> Flags; 59 60 /** ASI information for this request if it exists. */ 61 static const FlagsType ASI_BITS = 0x000000FF; 62 /** The request is a Load locked/store conditional. */ 63 static const FlagsType LOCKED = 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 /** The request should not cause a page fault. */ 73 static const FlagsType NO_FAULT = 0x00002000; 74 /** The request should be prefetched into the exclusive state. */ 75 static const FlagsType PF_EXCLUSIVE = 0x00010000; 76 /** The request should be marked as LRU. */ 77 static const FlagsType EVICT_NEXT = 0x00020000; 78 /** The request should ignore unaligned access faults */ 79 static const FlagsType NO_ALIGN_FAULT = 0x00040000; 80 /** The request was an instruction read. */ 81 static const FlagsType INST_READ = 0x00080000; 82 /** This request is for a memory swap. */ 83 static const FlagsType MEM_SWAP = 0x00100000; 84 static const FlagsType MEM_SWAP_COND = 0x00200000; 85 /** The request should ignore unaligned access faults */ 86 static const FlagsType NO_HALF_WORD_ALIGN_FAULT = 0x00400000; 87 /** This request is to a memory mapped register. */ 88 static const FlagsType MMAPED_IPR = 0x00800000; 89 90 private: 91 static const FlagsType PUBLIC_FLAGS = 0x00FF3FFF; 92 static const FlagsType PRIVATE_FLAGS = 0xFF000000; 93 94 /** Whether or not the size is valid. */ 95 static const FlagsType VALID_SIZE = 0x01000000; 96 /** Whether or not paddr is valid (has been written yet). */ 97 static const FlagsType VALID_PADDR = 0x02000000; 98 /** Whether or not the vaddr & asid are valid. */ 99 static const FlagsType VALID_VADDR = 0x04000000; 100 /** Whether or not the pc is valid. */ 101 static const FlagsType VALID_PC = 0x10000000; 102 /** Whether or not the context ID is valid. */ 103 static const FlagsType VALID_CONTEXT_ID = 0x20000000; 104 static const FlagsType VALID_THREAD_ID = 0x40000000; 105 /** Whether or not the sc result is valid. */ 106 static const FlagsType VALID_EXTRA_DATA = 0x80000000; 107 108 private: 109 /** 110 * The physical address of the request. Valid only if validPaddr 111 * is set. 112 */ 113 Addr paddr; 114 115 /** 116 * The size of the request. This field must be set when vaddr or 117 * paddr is written via setVirt() or setPhys(), so it is always 118 * valid as long as one of the address fields is valid. 119 */ 120 int size; 121 122 /** Flag structure for the request. */ 123 Flags flags; 124 125 /** 126 * The time this request was started. Used to calculate 127 * latencies. This field is set to curTick any time paddr or vaddr 128 * is written. 129 */ 130 Tick time; 131 132 /** The address space ID. */ 133 int asid; 134 135 /** The virtual address of the request. */ 136 Addr vaddr; 137 138 /** 139 * Extra data for the request, such as the return value of 140 * store conditional or the compare value for a CAS. */ 141 uint64_t extraData; 142 143 /** The context ID (for statistics, typically). */ 144 int _contextId; 145 /** The thread ID (id within this CPU) */ 146 int _threadId; 147 148 /** program counter of initiating access; for tracing/debugging */ 149 Addr pc; 150 151 public: 152 /** Minimal constructor. No fields are initialized. */ 153 Request() 154 {} 155 156 /** 157 * Constructor for physical (e.g. device) requests. Initializes 158 * just physical address, size, flags, and timestamp (to curTick). 159 * These fields are adequate to perform a request. 160 */ 161 Request(Addr paddr, int size, Flags flags) 162 { 163 setPhys(paddr, size, flags); 164 } 165 166 Request(int asid, Addr vaddr, int size, Flags flags, Addr pc, 167 int cid, int tid) 168 { 169 setThreadContext(cid, tid); 170 setVirt(asid, vaddr, size, flags, pc); 171 } 172 173 ~Request() {} // for FastAlloc 174 175 /** 176 * Set up CPU and thread numbers. 177 */ 178 void 179 setThreadContext(int context_id, int thread_id) 180 { 181 _contextId = context_id; 182 _threadId = thread_id; 183 flags.set(VALID_CONTEXT_ID|VALID_THREAD_ID); 184 } 185 186 /** 187 * Set up a physical (e.g. device) request in a previously 188 * allocated Request object. 189 */ 190 void 191 setPhys(Addr _paddr, int _size, Flags _flags) 192 { 193 assert(_size >= 0); 194 paddr = _paddr; 195 size = _size; 196 time = curTick; 197 198 flags.set(VALID_PADDR|VALID_SIZE); 199 flags.clear(VALID_VADDR|VALID_PC|VALID_EXTRA_DATA|MMAPED_IPR); 200 flags.update(_flags, PUBLIC_FLAGS); 201 } 202 203 /** 204 * Set up a virtual (e.g., CPU) request in a previously 205 * allocated Request object. 206 */ 207 void 208 setVirt(int _asid, Addr _vaddr, int _size, Flags _flags, Addr _pc) 209 { 210 assert(_size >= 0); 211 asid = _asid; 212 vaddr = _vaddr; 213 size = _size; 214 pc = _pc; 215 time = curTick; 216 217 flags.set(VALID_VADDR|VALID_SIZE|VALID_PC); 218 flags.clear(VALID_PADDR|VALID_EXTRA_DATA|MMAPED_IPR); 219 flags.update(_flags, PUBLIC_FLAGS); 220 } 221 222 /** 223 * Set just the physical address. This should only be used to 224 * record the result of a translation, and thus the vaddr must be 225 * valid before this method is called. Otherwise, use setPhys() 226 * to guarantee that the size and flags are also set. 227 */ 228 void 229 setPaddr(Addr _paddr) 230 { 231 assert(flags.any(VALID_VADDR)); 232 paddr = _paddr; 233 flags.set(VALID_PADDR); 234 } 235 236 /**
|
237 * Generate two requests as if this request had been split into two 238 * pieces. The original request can't have been translated already. 239 */ 240 void splitOnVaddr(Addr split_addr, RequestPtr &req1, RequestPtr &req2) 241 { 242 assert(flags.any(VALID_VADDR)); 243 assert(flags.none(VALID_PADDR)); 244 assert(split_addr > vaddr && split_addr < vaddr + size); 245 req1 = new Request; 246 *req1 = *this; 247 req2 = new Request; 248 *req2 = *this; 249 req1->size = split_addr - vaddr; 250 req2->vaddr = split_addr; 251 req2->size = size - req1->size; 252 } 253 254 /** |
255 * Accessor for paddr. 256 */ 257 Addr 258 getPaddr() 259 { 260 assert(flags.any(VALID_PADDR)); 261 return paddr; 262 } 263 264 /** 265 * Accessor for size. 266 */ 267 int 268 getSize() 269 { 270 assert(flags.any(VALID_SIZE)); 271 return size; 272 } 273 274 /** Accessor for time. */ 275 Tick 276 getTime() 277 { 278 assert(flags.any(VALID_PADDR|VALID_VADDR)); 279 return time; 280 } 281 282 void 283 setTime(Tick when) 284 { 285 assert(flags.any(VALID_PADDR|VALID_VADDR)); 286 time = when; 287 } 288 289 void resetTime() { setTime(curTick); } 290 291 /** Accessor for flags. */ 292 Flags 293 getFlags() 294 { 295 assert(flags.any(VALID_PADDR|VALID_VADDR)); 296 return flags & PUBLIC_FLAGS; 297 } 298 299 Flags 300 anyFlags(Flags _flags) 301 { 302 assert(flags.any(VALID_PADDR|VALID_VADDR)); 303 assert(_flags.none(~PUBLIC_FLAGS)); 304 return flags.any(_flags); 305 } 306 307 Flags 308 allFlags(Flags _flags) 309 { 310 assert(flags.any(VALID_PADDR|VALID_VADDR)); 311 assert(_flags.none(~PUBLIC_FLAGS)); 312 return flags.all(_flags); 313 } 314 315 /** Accessor for flags. */ 316 void 317 setFlags(Flags _flags) 318 { 319 assert(flags.any(VALID_PADDR|VALID_VADDR)); 320 assert(_flags.none(~PUBLIC_FLAGS)); 321 flags.set(_flags); 322 } 323 324 void 325 clearFlags(Flags _flags) 326 { 327 assert(flags.any(VALID_PADDR|VALID_VADDR)); 328 assert(_flags.none(~PUBLIC_FLAGS)); 329 flags.clear(_flags); 330 } 331 332 void 333 clearFlags() 334 { 335 assert(flags.any(VALID_PADDR|VALID_VADDR)); 336 flags.clear(PUBLIC_FLAGS); 337 } 338 339 /** Accessor function for vaddr.*/ 340 Addr 341 getVaddr() 342 { 343 assert(flags.any(VALID_VADDR)); 344 return vaddr; 345 } 346 347 /** Accessor function for asid.*/ 348 int 349 getAsid() 350 { 351 assert(flags.any(VALID_VADDR)); 352 return asid; 353 } 354 355 /** Accessor function for asi.*/ 356 uint8_t 357 getAsi() 358 { 359 assert(flags.any(VALID_VADDR)); 360 return flags & ASI_BITS; 361 } 362 363 /** Accessor function for asi.*/ 364 void 365 setAsi(uint8_t a) 366 { 367 assert(flags.any(VALID_VADDR)); 368 flags.update(a, ASI_BITS); 369 } 370 371 /** Accessor function for asi.*/ 372 bool 373 isMmapedIpr() 374 { 375 assert(flags.any(VALID_PADDR)); 376 return flags.any(MMAPED_IPR); 377 } 378 379 /** Accessor function for asi.*/ 380 void 381 setMmapedIpr(bool r) 382 { 383 assert(VALID_VADDR); 384 flags.set(MMAPED_IPR); 385 } 386 387 /** Accessor function to check if sc result is valid. */ 388 bool 389 extraDataValid() 390 { 391 return flags.any(VALID_EXTRA_DATA); 392 } 393 394 /** Accessor function for store conditional return value.*/ 395 uint64_t 396 getExtraData() const 397 { 398 assert(flags.any(VALID_EXTRA_DATA)); 399 return extraData; 400 } 401 402 /** Accessor function for store conditional return value.*/ 403 void 404 setExtraData(uint64_t _extraData) 405 { 406 extraData = _extraData; 407 flags.set(VALID_EXTRA_DATA); 408 } 409 410 /** Accessor function for context ID.*/ 411 int 412 contextId() const 413 { 414 assert(flags.any(VALID_CONTEXT_ID)); 415 return _contextId; 416 } 417 418 /** Accessor function for thread ID. */ 419 int 420 threadId() const 421 { 422 assert(flags.any(VALID_THREAD_ID)); 423 return _threadId; 424 } 425 426 /** Accessor function for pc.*/ 427 Addr 428 getPC() const 429 { 430 assert(flags.any(VALID_PC)); 431 return pc; 432 } 433 434 /** Accessor Function to Check Cacheability. */ 435 bool isUncacheable() const { return flags.any(UNCACHEABLE); } 436 bool isInstRead() const { return flags.any(INST_READ); } 437 bool isLocked() const { return flags.any(LOCKED); } 438 bool isSwap() const { return flags.any(MEM_SWAP|MEM_SWAP_COND); } 439 bool isCondSwap() const { return flags.any(MEM_SWAP_COND); } 440 441 bool 442 isMisaligned() const 443 { 444 if (flags.any(NO_ALIGN_FAULT)) 445 return false; 446 447 if ((vaddr & 0x1)) 448 return true; 449 450 if (flags.any(NO_HALF_WORD_ALIGN_FAULT)) 451 return false; 452 453 if ((vaddr & 0x2)) 454 return true; 455 456 return false; 457 } 458 459 friend class Packet; 460}; 461 462#endif // __MEM_REQUEST_HH__
|