| 1 | /* |
| 2 | * ========== Copyright Header Begin ========================================== |
| 3 | * |
| 4 | * OpenSPARC T2 Processor File: dmmu_miss_handler_ext.s |
| 5 | * Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved |
| 6 | * 4150 Network Circle, Santa Clara, California 95054, U.S.A. |
| 7 | * |
| 8 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; version 2 of the License. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | * |
| 23 | * For the avoidance of doubt, and except that if any non-GPL license |
| 24 | * choice is available it will apply instead, Sun elects to use only |
| 25 | * the General Public License version 2 (GPLv2) at this time for any |
| 26 | * software where a choice of GPL license versions is made |
| 27 | * available with the language indicating that GPLv2 or any later version |
| 28 | * may be used, or where a choice of which version of the GPL is applied is |
| 29 | * otherwise unspecified. |
| 30 | * |
| 31 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 32 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 33 | * have any questions. |
| 34 | * |
| 35 | * |
| 36 | * ========== Copyright Header End ============================================ |
| 37 | */ |
| 38 | dmmu_miss_handler: |
| 39 | |
| 40 | |
| 41 | #ifdef EX_TRAPCHECK |
| 42 | ! extended trapcheck returns traptype |
| 43 | mov 0x68, %o0 |
| 44 | #endif |
| 45 | mov ASI_DMMU_TAG_ACCESS_VAL, %g7 |
| 46 | ldxa [%g7] ASI_DMMU_TAG_REG, %g6 ! get va/context from tag-access |
| 47 | |
| 48 | #ifdef USE_SOFTWARE_PTR_CALC |
| 49 | ! SW Implementation of PTR register calQlations |
| 50 | |
| 51 | dconfig_0: |
| 52 | ! Load TSB_CONFIG address in %g7 |
| 53 | mov ASI_MMU_ZERO_CONTEXT_TSB_CONFIG_0, %g7 |
| 54 | |
| 55 | dmmu_tsbptr_calc: |
| 56 | !Uses g1-g5, Expects TSB_CONFIG address in %g7, va in %g6, REsults in %g1 |
| 57 | !Leave %g6 intact |
| 58 | #include <mmu_ptr_calc.s> |
| 59 | |
| 60 | #else |
| 61 | |
| 62 | mov ASI_DTSB_PTR_0, %g7 |
| 63 | |
| 64 | dmmu_tsbptr_calc: |
| 65 | |
| 66 | ldxa [%g7] ASI_DTSB_PTR, %g1 |
| 67 | |
| 68 | #endif |
| 69 | |
| 70 | #ifdef MIMIC_SOLARIS |
| 71 | srlx %g0, %g0, %g0 |
| 72 | brnz %g0, HT0_Fast_Data_Access_MMU_Miss_0x68 |
| 73 | sll %g0, %g0, %g0 |
| 74 | xor %g0, %g0, %g0 |
| 75 | #endif |
| 76 | |
| 77 | |
| 78 | dload_entry: |
| 79 | ldda [%g1] ASI_NUCLEUS_QUAD_LDD, %g4 ! load tte from tsb |
| 80 | srlx %g5, 63, %g2 ! Check valid bit .. |
| 81 | brz,a %g2, dmmu_check_for_ptr_chase |
| 82 | cmp %g4, -1 ! if all 1's, follow link |
| 83 | ldxa [%g0] ASI_DMMU_TAG_REG, %g2 ! get va/context from tag-target |
| 84 | #ifdef DMMU_HAS_SHARED_CTXT |
| 85 | check_dmmu_has_shared_ctx: |
| 86 | ! If this TSB has use_ctxt bits set, then mask context |
| 87 | ! 1. Get TSB config (%g7 has TSB_CONFIG addr OR TSB_PTR addr) |
| 88 | #ifndef USE_SOFTWARE_PTR_CALC |
| 89 | sllx %g6, 51, %g3 |
| 90 | brz,a %g3, compare_ttetag_d ! Ignore shared ctx for nucleus |
| 91 | stxa %g0, [%g0]ASI_SCRATCHPAD ! Save decision for later |
| 92 | sub %g7, 0x40, %g3 ! %g3 has TSB config ADDR |
| 93 | #else |
| 94 | mov %g7, %g3 ! %g3 has TSB config ADDR |
| 95 | #endif |
| 96 | ldxa [%g3] ASI_MMU_ZERO_CONTEXT_TSB_CONFIG, %g3 |
| 97 | check_use_ctx_d: |
| 98 | srlx %g3, 61, %g3 |
| 99 | and %g3, 3, %g3 ! %g3 has use_ctx bits .. |
| 100 | brz %g3, compare_ttetag_d |
| 101 | stxa %g3, [%g0]ASI_SCRATCHPAD ! Save decision for later |
| 102 | mask_ctx_d: |
| 103 | sethi %hi(0x1fff0000), %g1 |
| 104 | sllx %g1, 32, %g1 ! Create mask for ctxt in tag target |
| 105 | andn %g2, %g1, %g2 ! Masked tag target (%g2) |
| 106 | andn %g4, %g1, %g4 ! Masked tte tag (%g4) |
| 107 | #endif |
| 108 | compare_ttetag_d: |
| 109 | cmp %g2, %g4 |
| 110 | be %xcc, dmmu_trap_done |
| 111 | mov 0x80, %g1 ! offset (VA) for patrition id |
| 112 | |
| 113 | andcc %g5, 0x4, %g1 ! Check TTE size for mask |
| 114 | bz,a dmmu_check_for_ptr_chase ! size <5 .. no masking reqd |
| 115 | cmp %g4, -1 ! if all 1's, follow link |
| 116 | andn %g2, 0x3f, %g2 ! mask out bits 22:27 |
| 117 | cmp %g2, %g4 ! Now compare masked tag target |
| 118 | be %xcc, dmmu_trap_done |
| 119 | mov 0x80, %g1 ! offset (VA) for patrition id |
| 120 | |
| 121 | |
| 122 | dmmu_check_for_ptr_chase: |
| 123 | cmp %g4, -1 ! if all 1's, follow link |
| 124 | be,a %xcc, dmmu_ptr_chase |
| 125 | nop |
| 126 | |
| 127 | !! Look up all config registers (1-3) |
| 128 | |
| 129 | #ifdef USE_SOFTWARE_PTR_CALC |
| 130 | |
| 131 | !! Gotta do SW table walk through the 3 remaing configs .. |
| 132 | ! Expect %g7 to stll have addr of last ctx0 config register |
| 133 | ! and %g6 should have va/context from tag access register |
| 134 | |
| 135 | ! Normalize %g7 |
| 136 | sllx %g6, 51, %g5 |
| 137 | brnz,a %g5, 1f |
| 138 | sub %g7, 0x20, %g7 ! this executes only if branch taken |
| 139 | |
| 140 | 1: |
| 141 | |
| 142 | cmp %g7, ASI_MMU_ZERO_CONTEXT_TSB_CONFIG_1 |
| 143 | bl,a dmmu_tsbptr_calc |
| 144 | dconfig_1: |
| 145 | mov ASI_MMU_ZERO_CONTEXT_TSB_CONFIG_1, %g7 |
| 146 | |
| 147 | cmp %g7, ASI_MMU_ZERO_CONTEXT_TSB_CONFIG_2 |
| 148 | bl,a dmmu_tsbptr_calc |
| 149 | dconfig_2: |
| 150 | mov ASI_MMU_ZERO_CONTEXT_TSB_CONFIG_2, %g7 |
| 151 | |
| 152 | cmp %g7, ASI_MMU_ZERO_CONTEXT_TSB_CONFIG_3 |
| 153 | bl,a dmmu_tsbptr_calc |
| 154 | dconfig_3: |
| 155 | mov ASI_MMU_ZERO_CONTEXT_TSB_CONFIG_3, %g7 |
| 156 | |
| 157 | #else |
| 158 | |
| 159 | ! %g7 contains last pointer used .. |
| 160 | 1: |
| 161 | dconfig_1: |
| 162 | cmp %g7, ASI_DTSB_PTR_1 |
| 163 | bge,a %xcc, dconfig_2 |
| 164 | cmp %g7, ASI_DTSB_PTR_2 |
| 165 | mov ASI_DTSB_PTR_1, %g7 |
| 166 | ldxa [%g7] ASI_DTSB_PTR, %g1 |
| 167 | ba,a dload_entry |
| 168 | dconfig_2: |
| 169 | bge,a %xcc, dconfig_3 |
| 170 | cmp %g7, ASI_DTSB_PTR_3 |
| 171 | mov ASI_DTSB_PTR_2, %g7 |
| 172 | ldxa [%g7] ASI_DTSB_PTR, %g1 |
| 173 | ba,a dload_entry |
| 174 | dconfig_3: |
| 175 | bge %xcc, dno_tte_in_tsb |
| 176 | mov ASI_DTSB_PTR_3, %g7 |
| 177 | ldxa [%g7] ASI_DTSB_PTR, %g1 |
| 178 | ba,a dload_entry |
| 179 | #endif |
| 180 | |
| 181 | dno_tte_in_tsb: |
| 182 | nop |
| 183 | #ifdef DMMU_SKIP_IF_NO_TTE |
| 184 | done |
| 185 | nop |
| 186 | #endif |
| 187 | |
| 188 | dtsb_failing_noptr: |
| 189 | #if defined(KAOS_SIMULATION) |
| 190 | ba check_for_dmmu_flush_and_sigsegv |
| 191 | nop |
| 192 | #endif |
| 193 | ta T_BAD_TRAP |
| 194 | nop |
| 195 | |
| 196 | ! Preserve g6/g7 !! |
| 197 | dmmu_ptr_chase: |
| 198 | or %g5, %g0, %g3 ! %g3 is link-reg |
| 199 | dmmu_ptr_chase_loop: |
| 200 | ldda [%g3] ASI_NUCLEUS_QUAD_LDD, %g4 ! load tte from tsb |
| 201 | srlx %g5, 63, %g2 |
| 202 | brz %g2, dfollow_link |
| 203 | nop |
| 204 | ldxa [%g0] ASI_DMMU_TAG_REG, %g2 ! get va/context from tag-target |
| 205 | #ifdef DMMU_HAS_SHARED_CTXT |
| 206 | check_dmmu_has_shared_ctx_l: |
| 207 | ! If this TSB has use_ctxt bits set, then mask context |
| 208 | ! 1. Get TSB config (%g7 has TSB_CONFIG addr OR TSB_PTR addr) |
| 209 | #ifndef USE_SOFTWARE_PTR_CALC |
| 210 | sllx %g6, 51, %g1 |
| 211 | brz,a %g1, compare_ttetag_dl ! Ignore shared ctx for nucleus |
| 212 | stxa %g0, [%g0]ASI_SCRATCHPAD ! Save decision for later |
| 213 | sub %g7, 0x40, %g1 ! %g1 has TSB config ADDR |
| 214 | #else |
| 215 | mov %g7, %g1 ! %g1 has TSB config ADDR |
| 216 | #endif |
| 217 | ldxa [%g1] ASI_MMU_ZERO_CONTEXT_TSB_CONFIG, %g1 |
| 218 | check_use_ctx_dl: |
| 219 | srlx %g1, 61, %g1 |
| 220 | and %g1, 3, %g1 ! %g1 has use_ctx bits .. |
| 221 | brz %g1, compare_ttetag_dl |
| 222 | stxa %g1, [%g0]ASI_SCRATCHPAD ! Save decision for later |
| 223 | mask_ctx_dl: |
| 224 | sethi %hi(0x1fff0000), %g1 |
| 225 | sllx %g1, 32, %g1 ! Create mask for ctxt in tag target |
| 226 | |
| 227 | andn %g2, %g1, %g2 ! Masked tag target (%g2) |
| 228 | andn %g4, %g1, %g4 ! Masked tte tag (%g4) |
| 229 | #endif |
| 230 | compare_ttetag_dl: |
| 231 | cmp %g2, %g4 |
| 232 | be %xcc, dmmu_trap_done |
| 233 | mov 0x80, %g1 ! offset (VA) for patrition id |
| 234 | |
| 235 | andcc %g5, 0x4, %g1 ! Check TTE size for mask |
| 236 | bz dfollow_link ! size <5 .. no masking reqd |
| 237 | andn %g2, 0x3f, %g2 ! mask out bits 22:27 |
| 238 | cmp %g2, %g4 ! Now compare masked tag target |
| 239 | be %xcc, dmmu_trap_done |
| 240 | mov 0x80, %g1 ! offset (VA) for patrition id |
| 241 | ! DONT USE G1 until PA is done |
| 242 | |
| 243 | dfollow_link: |
| 244 | ldx [%g3+16], %g3 |
| 245 | cmp %g3, -1 |
| 246 | bne %xcc, dmmu_ptr_chase_loop ! keep chasing pointer |
| 247 | nop |
| 248 | |
| 249 | dnext_tsb: |
| 250 | ! Look up the Next TSB, until done with all TSBs ? |
| 251 | #ifdef USE_SOFTWARE_PTR_CALC |
| 252 | ! Compare with TSB_CONFIG_3 for ctx0 and TSB_CONFIG_3+0x20 for ctx!0 |
| 253 | mov ASI_MMU_ZERO_CONTEXT_TSB_CONFIG_3, %g4 |
| 254 | sllx %g6, 51, %g5 |
| 255 | brnz,a %g5, 2f |
| 256 | sub %g7, 0x20, %g7 |
| 257 | 2: |
| 258 | cmp %g7, %g4 |
| 259 | bl 1b |
| 260 | nop |
| 261 | #else |
| 262 | cmp %g7, ASI_DTSB_PTR_3 |
| 263 | bl 1b |
| 264 | nop |
| 265 | #endif |
| 266 | |
| 267 | dpointer_chase_unsuccessful: |
| 268 | #ifdef DMMU_SKIP_IF_NO_TTE |
| 269 | done |
| 270 | nop |
| 271 | #endif |
| 272 | |
| 273 | dpage_fault_ptr: |
| 274 | #if defined(KAOS_SIMULATION) |
| 275 | ba check_for_dmmu_flush_and_sigsegv |
| 276 | nop |
| 277 | #endif |
| 278 | ta T_BAD_TRAP |
| 279 | nop |
| 280 | |
| 281 | dmmu_trap_done: |
| 282 | #ifdef DMMU_HAS_SHARED_CTXT |
| 283 | ! %g6 has the unmasked tag access |
| 284 | ldxa [%g0]ASI_SCRATCHPAD, %g3 ! Do we need to force ctxt ? |
| 285 | brz %g3, done_forcing_ctxt_d ! Nope |
| 286 | cmp %g3, 1 ! Which one ? |
| 287 | movne %xcc, 0x8, %g3 ! ctxt_0 |
| 288 | move %xcc, 0x108, %g3 ! ctxt_1 |
| 289 | force_ctxt_d: |
| 290 | ldxa [%g3]ASI_PRIMARY_CONTEXT_REG, %g3 ! Get ctxt value |
| 291 | srlx %g6, 13, %g2 |
| 292 | sllx %g2, 13, %g2 ! Clear ctxt from tag-access |
| 293 | or %g3, %g2, %g2 ! Stuff in masked tag-access |
| 294 | mov ASI_DMMU_TAG_ACCESS_VAL, %g3 |
| 295 | stxa %g2, [%g3]0x50 ! Save forced ctx in tag-access |
| 296 | done_forcing_ctxt_d: |
| 297 | #endif |
| 298 | #ifdef SOME_TSB_PANOTRA |
| 299 | ! Figure out if Offset should be added. |
| 300 | ! %g7 contains TSB VA if SW ptr calc, and PTR address if HW_PTR_CALC |
| 301 | ! %g6 contains ASI_DMMU_TAG_REG value |
| 302 | #ifndef USE_SOFTWARE_PTR_CALC |
| 303 | sllx %g6, 51, %g3 |
| 304 | brz,a %g3, .+8 |
| 305 | sub %g7, 0x20, %g7 ! extra subtract for Z ctx |
| 306 | sub %g7, 0x40, %g7 |
| 307 | #endif |
| 308 | ldxa [%g7] ASI_MMU_ZERO_CONTEXT_TSB_CONFIG, %g3 |
| 309 | check_ranotpa_d: |
| 310 | and %g3, 0x100, %g3 ! Is RANOTPA 1 ? |
| 311 | brz,a %g3, loaded_dtlb |
| 312 | stxa %g5, [ %g0 ] ASI_DTLB_DATA_IN ! data-in |
| 313 | #endif |
| 314 | xlate_ratopa_d: |
| 315 | ! add partition base to data-in |
| 316 | setx partition_base_list, %g3, %g2 ! for partition base |
| 317 | ldxa [%g1] ASI_PARTITION_ID, %g3 ! partition id |
| 318 | sllx %g3, 3, %g3 ! offset - partition list |
| 319 | ldx [%g2 + %g3], %g1 |
| 320 | add %g5, %g1, %g5 |
| 321 | |
| 322 | dmmu_skip_part_base: |
| 323 | |
| 324 | stxa %g5, [ %g0 ] ASI_DTLB_DATA_IN ! data-in |
| 325 | loaded_dtlb: |
| 326 | retry |
| 327 | |
| 328 | |
| 329 | |
| 330 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
| 331 | ! Data_Real_Tran_Miss_0x3f code here |
| 332 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
| 333 | |
| 334 | dmmu_real_miss_handler: |
| 335 | mov 0x30, %g7 |
| 336 | ldxa [%g7] 0x58, %g2 ! get ra from tag-access |
| 337 | |
| 338 | !! check to see if RA[39] is set. |
| 339 | !! RA[39] = 0 means accessing memory space |
| 340 | !! RA[39] = 1 means accessing I/O space |
| 341 | mov %g2, %g4 |
| 342 | mov %g0, %g1 ! %g1 will contain partition base |
| 343 | |
| 344 | #ifndef DISABLE_PART_LIMIT_CHECK |
| 345 | mov %g4, %g2 |
| 346 | srlx %g2, 33, %g2 ! check to see if ra exceeds 8GB limit |
| 347 | cmp %g2, %g0 |
| 348 | tne %xcc, T_BAD_TRAP |
| 349 | #endif |
| 350 | |
| 351 | ! add partition base to data-in |
| 352 | setx partition_base_list, %g1, %g2 ! for partition base |
| 353 | mov ASI_PARTITION_ID_VAL, %g1 ! offset (VA) for patrition id |
| 354 | ldxa [%g1] ASI_PARTITION_ID, %g3 ! partition id |
| 355 | sllx %g3, 3, %g3 ! offset - partition list |
| 356 | ldx [%g2 + %g3], %g1 |
| 357 | |
| 358 | dmmu_real_skip_part_base: |
| 359 | #ifdef REAL_DATA_ATTR |
| 360 | setx REAL_DATA_ATTR, %g2, %g5 ! user defined attributes |
| 361 | #else |
| 362 | #ifndef SUN4V |
| 363 | setx 0x8000000000000022, %g2, %g5 ! CP W |
| 364 | #else |
| 365 | setx 0x8000000000000440, %g2, %g5 ! CP W |
| 366 | #endif |
| 367 | #endif |
| 368 | |
| 369 | srlx %g4, 13, %g4 ! get rid of garbage in context field |
| 370 | sllx %g4, 13, %g4 |
| 371 | or %g4, %g5, %g5 |
| 372 | add %g5, %g1, %g5 |
| 373 | mov ASI_DMMU_TAG_ACCESS_VAL, %g7 |
| 374 | |
| 375 | |
| 376 | mov 0x400, %g6 |
| 377 | stxa %g4, [ %g7 ] ASI_DMMU_TAG_REG ! {tag-access, data-in} |
| 378 | stxa %g5, [ %g6 ] ASI_DTLB_DATA_IN |
| 379 | retry |
| 380 | |
| 381 | /* Code specific for KAOS */ |
| 382 | #if defined(KAOS_SIMULATION) |
| 383 | check_for_dmmu_flush_and_sigsegv: |
| 384 | done |
| 385 | /* check for flush */ |
| 386 | |
| 387 | ldxa [%g0]ASI_DMMU_TAG_TARGET, %g5 |
| 388 | ldxa [%g0] 0x59, %g1 |
| 389 | |
| 390 | and %g5, 0x3ff, %g5 |
| 391 | sll %g5, 9, %g5 |
| 392 | srl %g1, 4, %g1 |
| 393 | and %g1, 0x1ff, %g1 |
| 394 | or %g1, %g5, %g4 |
| 395 | |
| 396 | !ta 0x2 |
| 397 | rdpr %tpc, %g2 |
| 398 | |
| 399 | ta 0x2e |
| 400 | cmp %o1, 0 |
| 401 | setx ra2pa(LOCAL_SUPERVISOR_SECTION_DATA_PA_0 THR_0_PARTID,), %g3, %g1 |
| 402 | be,a 1f |
| 403 | nop |
| 404 | cmp %o1, 1 |
| 405 | setx ra2pa(LOCAL_SUPERVISOR_SECTION_DATA_PA_1, THR_1_PARTID), %g3, %g1 |
| 406 | be,a 1f |
| 407 | nop |
| 408 | cmp %o1, 2 |
| 409 | setx ra2pa(LOCAL_SUPERVISOR_SECTION_DATA_PA_2, THR_2_PARTID), %g3, %g1 |
| 410 | be,a 1f |
| 411 | nop |
| 412 | cmp %o1, 3 |
| 413 | setx ra2pa(LOCAL_SUPERVISOR_SECTION_DATA_PA_3, THR_3_PARTID), %g3, %g1 |
| 414 | be,a 1f |
| 415 | nop |
| 416 | cmp %o1, 4 |
| 417 | setx ra2pa(LOCAL_SUPERVISOR_SECTION_DATA_PA_4, THR_4_PARTID), %g3, %g1 |
| 418 | be,a 1f |
| 419 | nop |
| 420 | cmp %o1, 5 |
| 421 | setx ra2pa(LOCAL_SUPERVISOR_SECTION_DATA_PA_5, THR_5_PARTID), %g3, %g1 |
| 422 | be,a 1f |
| 423 | nop |
| 424 | cmp %o1, 6 |
| 425 | setx ra2pa(LOCAL_SUPERVISOR_SECTION_DATA_PA_6, THR_6_PARTID), %g3, %g1 |
| 426 | be,a 1f |
| 427 | nop |
| 428 | cmp %o1, 7 |
| 429 | setx ra2pa(LOCAL_SUPERVISOR_SECTION_DATA_PA_7,THR_7_PARTID), %g3, %g1 |
| 430 | be,a 1f |
| 431 | nop |
| 432 | ta 0x1 |
| 433 | nop |
| 434 | |
| 435 | 1: stx %g2, [%g1] |
| 436 | |
| 437 | mov 0x08, %g1 |
| 438 | ldxa [%g1] 0x21, %o1 |
| 439 | mov 0x10, %g1 |
| 440 | ldxa [%g1] 0x21, %o2 |
| 441 | set 0x1, %o3 |
| 442 | set 0x0, %o4 |
| 443 | setx data_segv_check, %g1, %o5 |
| 444 | |
| 445 | ta 0x2a |
| 446 | |
| 447 | nop |
| 448 | |
| 449 | #endif |