system.cc revision 6220
1/* 2 * Copyright (c) 2007 The Hewlett-Packard Development Company 3 * All rights reserved. 4 * 5 * Redistribution and use of this software in source and binary forms, 6 * with or without modification, are permitted provided that the 7 * following conditions are met: 8 * 9 * The software must be used only for Non-Commercial Use which means any 10 * use which is NOT directed to receiving any direct monetary 11 * compensation for, or commercial advantage from such use. Illustrative 12 * examples of non-commercial use are academic research, personal study, 13 * teaching, education and corporate research & development. 14 * Illustrative examples of commercial use are distributing products for 15 * commercial advantage and providing services using the software for 16 * commercial advantage. 17 * 18 * If you wish to use this software or functionality therein that may be 19 * covered by patents for commercial use, please contact: 20 * Director of Intellectual Property Licensing 21 * Office of Strategy and Technology 22 * Hewlett-Packard Company 23 * 1501 Page Mill Road 24 * Palo Alto, California 94304 25 * 26 * Redistributions of source code must retain the above copyright notice, 27 * this list of conditions and the following disclaimer. Redistributions 28 * in binary form must reproduce the above copyright notice, this list of 29 * conditions and the following disclaimer in the documentation and/or 30 * other materials provided with the distribution. Neither the name of 31 * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its 32 * contributors may be used to endorse or promote products derived from 33 * this software without specific prior written permission. No right of 34 * sublicense is granted herewith. Derivatives of the software and 35 * output created using the software may be prepared, but only for 36 * Non-Commercial Uses. Derivatives of the software may be shared with 37 * others provided: (i) the others agree to abide by the list of 38 * conditions herein which includes the Non-Commercial Use restrictions; 39 * and (ii) such Derivatives of the software include the above copyright 40 * notice to acknowledge the contribution from this software where 41 * applicable, this list of conditions and the disclaimer below. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 * 55 * Authors: Gabe Black 56 */ 57 58#include "arch/x86/bios/smbios.hh" 59#include "arch/x86/bios/intelmp.hh" 60#include "arch/x86/miscregs.hh" 61#include "arch/x86/system.hh" 62#include "arch/vtophys.hh" 63#include "base/intmath.hh" 64#include "base/loader/object_file.hh" 65#include "base/loader/symtab.hh" 66#include "base/remote_gdb.hh" 67#include "base/trace.hh" 68#include "cpu/thread_context.hh" 69#include "mem/physical.hh" 70#include "params/X86System.hh" 71#include "sim/byteswap.hh" 72 73 74using namespace LittleEndianGuest; 75using namespace X86ISA; 76 77X86System::X86System(Params *p) : 78 System(p), smbiosTable(p->smbios_table), 79 mpFloatingPointer(p->intel_mp_pointer), 80 mpConfigTable(p->intel_mp_table), 81 rsdp(p->acpi_description_table_pointer) 82{} 83 84static void 85installSegDesc(ThreadContext *tc, SegmentRegIndex seg, 86 SegDescriptor desc, bool longmode) 87{ 88 uint64_t base = desc.baseLow + (desc.baseHigh << 24); 89 bool honorBase = !longmode || seg == SEGMENT_REG_FS || 90 seg == SEGMENT_REG_GS || 91 seg == SEGMENT_REG_TSL || 92 seg == SYS_SEGMENT_REG_TR; 93 uint64_t limit = desc.limitLow | (desc.limitHigh << 16); 94 95 SegAttr attr = 0; 96 if (desc.s) { 97 if (desc.type.codeOrData) { 98 // Code segment 99 attr.readable = desc.type.r; 100 } else { 101 // Data segment 102 attr.readable = 1; 103 attr.writable = desc.type.w; 104 attr.expandDown = desc.type.e; 105 } 106 } else { 107 attr.writable = 1; 108 attr.readable = 1; 109 attr.expandDown = 0; 110 } 111 attr.longMode = desc.l; 112 attr.dpl = desc.dpl; 113 attr.defaultSize = desc.d; 114 115 tc->setMiscReg(MISCREG_SEG_BASE(seg), base); 116 tc->setMiscReg(MISCREG_SEG_EFF_BASE(seg), honorBase ? base : 0); 117 tc->setMiscReg(MISCREG_SEG_LIMIT(seg), limit); 118 tc->setMiscReg(MISCREG_SEG_ATTR(seg), (MiscReg)attr); 119} 120 121void 122X86System::startup() 123{ 124 System::startup(); 125 ThreadContext *tc = threadContexts[0]; 126 // This is the boot strap processor (BSP). Initialize it to look like 127 // the boot loader has just turned control over to the 64 bit OS. We 128 // won't actually set up real mode or legacy protected mode descriptor 129 // tables because we aren't executing any code that would require 130 // them. We do, however toggle the control bits in the correct order 131 // while allowing consistency checks and the underlying mechansims 132 // just to be safe. 133 134 const int NumPDTs = 4; 135 136 const Addr PageMapLevel4 = 0x70000; 137 const Addr PageDirPtrTable = 0x71000; 138 const Addr PageDirTable[NumPDTs] = 139 {0x72000, 0x73000, 0x74000, 0x75000}; 140 const Addr GDTBase = 0x76000; 141 142 const int PML4Bits = 9; 143 const int PDPTBits = 9; 144 const int PDTBits = 9; 145 146 // Get a port to write the page tables and descriptor tables. 147 FunctionalPort * physPort = tc->getPhysPort(); 148 149 /* 150 * Set up the gdt. 151 */ 152 uint8_t numGDTEntries = 0; 153 // Place holder at selector 0 154 uint64_t nullDescriptor = 0; 155 physPort->writeBlob(GDTBase + numGDTEntries * 8, 156 (uint8_t *)(&nullDescriptor), 8); 157 numGDTEntries++; 158 159 //64 bit code segment 160 SegDescriptor csDesc = 0; 161 csDesc.type.codeOrData = 1; 162 csDesc.type.c = 0; // Not conforming 163 csDesc.type.r = 1; // Readable 164 csDesc.dpl = 0; // Privelege level 0 165 csDesc.p = 1; // Present 166 csDesc.l = 1; // 64 bit 167 csDesc.d = 0; // default operand size 168 csDesc.g = 1; // Page granularity 169 csDesc.s = 1; // Not a system segment 170 csDesc.limitHigh = 0xF; 171 csDesc.limitLow = 0xFF; 172 //Because we're dealing with a pointer and I don't think it's 173 //guaranteed that there isn't anything in a nonvirtual class between 174 //it's beginning in memory and it's actual data, we'll use an 175 //intermediary. 176 uint64_t csDescVal = csDesc; 177 physPort->writeBlob(GDTBase + numGDTEntries * 8, 178 (uint8_t *)(&csDescVal), 8); 179 180 numGDTEntries++; 181 182 SegSelector cs = 0; 183 cs.si = numGDTEntries - 1; 184 185 tc->setMiscReg(MISCREG_CS, (MiscReg)cs); 186 187 //32 bit data segment 188 SegDescriptor dsDesc = 0; 189 dsDesc.type.codeOrData = 0; 190 dsDesc.type.e = 0; // Not expand down 191 dsDesc.type.w = 1; // Writable 192 dsDesc.dpl = 0; // Privelege level 0 193 dsDesc.p = 1; // Present 194 dsDesc.d = 1; // default operand size 195 dsDesc.g = 1; // Page granularity 196 dsDesc.s = 1; // Not a system segment 197 dsDesc.limitHigh = 0xF; 198 dsDesc.limitLow = 0xFF; 199 uint64_t dsDescVal = dsDesc; 200 physPort->writeBlob(GDTBase + numGDTEntries * 8, 201 (uint8_t *)(&dsDescVal), 8); 202 203 numGDTEntries++; 204 205 SegSelector ds; 206 ds.si = numGDTEntries - 1; 207 208 tc->setMiscReg(MISCREG_DS, (MiscReg)ds); 209 tc->setMiscReg(MISCREG_ES, (MiscReg)ds); 210 tc->setMiscReg(MISCREG_FS, (MiscReg)ds); 211 tc->setMiscReg(MISCREG_GS, (MiscReg)ds); 212 tc->setMiscReg(MISCREG_SS, (MiscReg)ds); 213 214 tc->setMiscReg(MISCREG_TSL, 0); 215 tc->setMiscReg(MISCREG_TSG_BASE, GDTBase); 216 tc->setMiscReg(MISCREG_TSG_LIMIT, 8 * numGDTEntries - 1); 217 218 SegDescriptor tssDesc = 0; 219 tssDesc.type = 0xB; 220 tssDesc.dpl = 0; // Privelege level 0 221 tssDesc.p = 1; // Present 222 tssDesc.d = 1; // default operand size 223 tssDesc.g = 1; // Page granularity 224 tssDesc.s = 1; // Not a system segment 225 tssDesc.limitHigh = 0xF; 226 tssDesc.limitLow = 0xFF; 227 uint64_t tssDescVal = tssDesc; 228 physPort->writeBlob(GDTBase + numGDTEntries * 8, 229 (uint8_t *)(&tssDescVal), 8); 230 231 numGDTEntries++; 232 233 SegSelector tss = 0; 234 tss.si = numGDTEntries - 1; 235 236 tc->setMiscReg(MISCREG_TR, (MiscReg)tss); 237 installSegDesc(tc, SYS_SEGMENT_REG_TR, tssDesc, true); 238 239 /* 240 * Identity map the first 4GB of memory. In order to map this region 241 * of memory in long mode, there needs to be one actual page map level 242 * 4 entry which points to one page directory pointer table which 243 * points to 4 different page directory tables which are full of two 244 * megabyte pages. All of the other entries in valid tables are set 245 * to indicate that they don't pertain to anything valid and will 246 * cause a fault if used. 247 */ 248 249 // Put valid values in all of the various table entries which indicate 250 // that those entries don't point to further tables or pages. Then 251 // set the values of those entries which are needed. 252 253 // Page Map Level 4 254 255 // read/write, user, not present 256 uint64_t pml4e = X86ISA::htog(0x6); 257 for (int offset = 0; offset < (1 << PML4Bits) * 8; offset += 8) { 258 physPort->writeBlob(PageMapLevel4 + offset, (uint8_t *)(&pml4e), 8); 259 } 260 // Point to the only PDPT 261 pml4e = X86ISA::htog(0x7 | PageDirPtrTable); 262 physPort->writeBlob(PageMapLevel4, (uint8_t *)(&pml4e), 8); 263 264 // Page Directory Pointer Table 265 266 // read/write, user, not present 267 uint64_t pdpe = X86ISA::htog(0x6); 268 for (int offset = 0; offset < (1 << PDPTBits) * 8; offset += 8) { 269 physPort->writeBlob(PageDirPtrTable + offset, 270 (uint8_t *)(&pdpe), 8); 271 } 272 // Point to the PDTs 273 for (int table = 0; table < NumPDTs; table++) { 274 pdpe = X86ISA::htog(0x7 | PageDirTable[table]); 275 physPort->writeBlob(PageDirPtrTable + table * 8, 276 (uint8_t *)(&pdpe), 8); 277 } 278 279 // Page Directory Tables 280 281 Addr base = 0; 282 const Addr pageSize = 2 << 20; 283 for (int table = 0; table < NumPDTs; table++) { 284 for (int offset = 0; offset < (1 << PDTBits) * 8; offset += 8) { 285 // read/write, user, present, 4MB 286 uint64_t pdte = X86ISA::htog(0x87 | base); 287 physPort->writeBlob(PageDirTable[table] + offset, 288 (uint8_t *)(&pdte), 8); 289 base += pageSize; 290 } 291 } 292 293 /* 294 * Transition from real mode all the way up to Long mode 295 */ 296 CR0 cr0 = tc->readMiscRegNoEffect(MISCREG_CR0); 297 //Turn off paging. 298 cr0.pg = 0; 299 tc->setMiscReg(MISCREG_CR0, cr0); 300 //Turn on protected mode. 301 cr0.pe = 1; 302 tc->setMiscReg(MISCREG_CR0, cr0); 303 304 CR4 cr4 = tc->readMiscRegNoEffect(MISCREG_CR4); 305 //Turn on pae. 306 cr4.pae = 1; 307 tc->setMiscReg(MISCREG_CR4, cr4); 308 309 //Point to the page tables. 310 tc->setMiscReg(MISCREG_CR3, PageMapLevel4); 311 312 Efer efer = tc->readMiscRegNoEffect(MISCREG_EFER); 313 //Enable long mode. 314 efer.lme = 1; 315 tc->setMiscReg(MISCREG_EFER, efer); 316 317 //Start using longmode segments. 318 installSegDesc(tc, SEGMENT_REG_CS, csDesc, true); 319 installSegDesc(tc, SEGMENT_REG_DS, dsDesc, true); 320 installSegDesc(tc, SEGMENT_REG_ES, dsDesc, true); 321 installSegDesc(tc, SEGMENT_REG_FS, dsDesc, true); 322 installSegDesc(tc, SEGMENT_REG_GS, dsDesc, true); 323 installSegDesc(tc, SEGMENT_REG_SS, dsDesc, true); 324 325 //Activate long mode. 326 cr0.pg = 1; 327 tc->setMiscReg(MISCREG_CR0, cr0); 328 329 tc->setPC(tc->getSystemPtr()->kernelEntry); 330 tc->setNextPC(tc->readPC()); 331 332 // We should now be in long mode. Yay! 333 334 Addr ebdaPos = 0xF0000; 335 Addr fixed, table; 336 337 //Write out the SMBios/DMI table 338 writeOutSMBiosTable(ebdaPos, fixed, table); 339 ebdaPos += (fixed + table); 340 ebdaPos = roundUp(ebdaPos, 16); 341 342 //Write out the Intel MP Specification configuration table 343 writeOutMPTable(ebdaPos, fixed, table); 344 ebdaPos += (fixed + table); 345} 346 347void 348X86System::writeOutSMBiosTable(Addr header, 349 Addr &headerSize, Addr &structSize, Addr table) 350{ 351 // Get a port to write the table and header to memory. 352 FunctionalPort * physPort = threadContexts[0]->getPhysPort(); 353 354 // If the table location isn't specified, just put it after the header. 355 // The header size as of the 2.5 SMBios specification is 0x1F bytes 356 if (!table) 357 table = header + 0x1F; 358 smbiosTable->setTableAddr(table); 359 360 smbiosTable->writeOut(physPort, header, headerSize, structSize); 361 362 // Do some bounds checking to make sure we at least didn't step on 363 // ourselves. 364 assert(header > table || header + headerSize <= table); 365 assert(table > header || table + structSize <= header); 366} 367 368void 369X86System::writeOutMPTable(Addr fp, 370 Addr &fpSize, Addr &tableSize, Addr table) 371{ 372 // Get a port to write the table and header to memory. 373 FunctionalPort * physPort = threadContexts[0]->getPhysPort(); 374 375 // If the table location isn't specified and it exists, just put 376 // it after the floating pointer. The fp size as of the 1.4 Intel MP 377 // specification is 0x10 bytes. 378 if (mpConfigTable) { 379 if (!table) 380 table = fp + 0x10; 381 mpFloatingPointer->setTableAddr(table); 382 } 383 384 fpSize = mpFloatingPointer->writeOut(physPort, fp); 385 if (mpConfigTable) 386 tableSize = mpConfigTable->writeOut(physPort, table); 387 else 388 tableSize = 0; 389 390 // Do some bounds checking to make sure we at least didn't step on 391 // ourselves and the fp structure was the size we thought it was. 392 assert(fp > table || fp + fpSize <= table); 393 assert(table > fp || table + tableSize <= fp); 394 assert(fpSize == 0x10); 395} 396 397 398X86System::~X86System() 399{ 400 delete smbiosTable; 401} 402 403void 404X86System::serialize(std::ostream &os) 405{ 406 System::serialize(os); 407} 408 409 410void 411X86System::unserialize(Checkpoint *cp, const std::string §ion) 412{ 413 System::unserialize(cp,section); 414} 415 416X86System * 417X86SystemParams::create() 418{ 419 return new X86System(this); 420} 421