Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/powerpc/powerpc/machdep.c
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1 /*- 2 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 3 * Copyright (C) 1995, 1996 TooLs GmbH. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by TooLs GmbH. 17 * 4. The name of TooLs GmbH may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /*- 32 * Copyright (C) 2001 Benno Rice 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 44 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 45 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 47 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 49 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 50 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 51 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 52 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 53 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 * $NetBSD: machdep.c,v 1.74.2.1 2000/11/01 16:13:48 tv Exp $ 55 */ 56 57 #include <sys/cdefs.h> 58 __FBSDID("$FreeBSD$"); 59 60 #include "opt_ddb.h" 61 #include "opt_kstack_pages.h" 62 #include "opt_platform.h" 63 64 #include <sys/param.h> 65 #include <sys/proc.h> 66 #include <sys/systm.h> 67 #include <sys/bio.h> 68 #include <sys/buf.h> 69 #include <sys/bus.h> 70 #include <sys/cons.h> 71 #include <sys/cpu.h> 72 #include <sys/eventhandler.h> 73 #include <sys/exec.h> 74 #include <sys/imgact.h> 75 #include <sys/kdb.h> 76 #include <sys/kernel.h> 77 #include <sys/ktr.h> 78 #include <sys/linker.h> 79 #include <sys/lock.h> 80 #include <sys/malloc.h> 81 #include <sys/mbuf.h> 82 #include <sys/msgbuf.h> 83 #include <sys/mutex.h> 84 #include <sys/ptrace.h> 85 #include <sys/reboot.h> 86 #include <sys/reg.h> 87 #include <sys/rwlock.h> 88 #include <sys/signalvar.h> 89 #include <sys/syscallsubr.h> 90 #include <sys/sysctl.h> 91 #include <sys/sysent.h> 92 #include <sys/sysproto.h> 93 #include <sys/ucontext.h> 94 #include <sys/uio.h> 95 #include <sys/vmmeter.h> 96 #include <sys/vnode.h> 97 98 #include <net/netisr.h> 99 100 #include <vm/vm.h> 101 #include <vm/vm_extern.h> 102 #include <vm/vm_kern.h> 103 #include <vm/vm_page.h> 104 #include <vm/vm_phys.h> 105 #include <vm/vm_map.h> 106 #include <vm/vm_object.h> 107 #include <vm/vm_pager.h> 108 109 #include <machine/altivec.h> 110 #ifndef __powerpc64__ 111 #include <machine/bat.h> 112 #endif 113 #include <machine/cpu.h> 114 #include <machine/elf.h> 115 #include <machine/fpu.h> 116 #include <machine/hid.h> 117 #include <machine/ifunc.h> 118 #include <machine/kdb.h> 119 #include <machine/md_var.h> 120 #include <machine/metadata.h> 121 #include <machine/mmuvar.h> 122 #include <machine/pcb.h> 123 #include <machine/sigframe.h> 124 #include <machine/spr.h> 125 #include <machine/trap.h> 126 #include <machine/vmparam.h> 127 #include <machine/ofw_machdep.h> 128 129 #include <ddb/ddb.h> 130 131 #include <dev/ofw/openfirm.h> 132 #include <dev/ofw/ofw_subr.h> 133 134 int cold = 1; 135 #ifdef __powerpc64__ 136 int cacheline_size = 128; 137 #else 138 int cacheline_size = 32; 139 #endif 140 #ifdef __powerpc64__ 141 int hw_direct_map = -1; 142 #else 143 int hw_direct_map = 1; 144 #endif 145 146 #ifdef BOOKE 147 extern vm_paddr_t kernload; 148 #endif 149 150 extern void *ap_pcpu; 151 152 struct pcpu __pcpu[MAXCPU] __aligned(PAGE_SIZE); 153 static char init_kenv[2048]; 154 155 static struct trapframe frame0; 156 157 char machine[] = "powerpc"; 158 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 159 160 static void cpu_startup(void *); 161 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); 162 163 SYSCTL_INT(_machdep, CPU_CACHELINE, cacheline_size, 164 CTLFLAG_RD, &cacheline_size, 0, ""); 165 166 uintptr_t powerpc_init(vm_offset_t, vm_offset_t, vm_offset_t, void *, 167 uint32_t); 168 169 static void fake_preload_metadata(void); 170 171 long Maxmem = 0; 172 long realmem = 0; 173 174 /* Default MSR values set in the AIM/Book-E early startup code */ 175 register_t psl_kernset; 176 register_t psl_userset; 177 register_t psl_userstatic; 178 #ifdef __powerpc64__ 179 register_t psl_userset32; 180 #endif 181 182 struct kva_md_info kmi; 183 184 static void 185 cpu_startup(void *dummy) 186 { 187 188 /* 189 * Initialise the decrementer-based clock. 190 */ 191 decr_init(); 192 193 /* 194 * Good {morning,afternoon,evening,night}. 195 */ 196 cpu_setup(PCPU_GET(cpuid)); 197 198 #ifdef PERFMON 199 perfmon_init(); 200 #endif 201 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)physmem), 202 ptoa((uintmax_t)physmem) / 1048576); 203 realmem = physmem; 204 205 if (bootverbose) 206 printf("available KVA = %zu (%zu MB)\n", 207 virtual_end - virtual_avail, 208 (virtual_end - virtual_avail) / 1048576); 209 210 /* 211 * Display any holes after the first chunk of extended memory. 212 */ 213 if (bootverbose) { 214 int indx; 215 216 printf("Physical memory chunk(s):\n"); 217 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 218 vm_paddr_t size1 = 219 phys_avail[indx + 1] - phys_avail[indx]; 220 221 #ifdef __powerpc64__ 222 printf("0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n", 223 #else 224 printf("0x%09jx - 0x%09jx, %ju bytes (%ju pages)\n", 225 #endif 226 (uintmax_t)phys_avail[indx], 227 (uintmax_t)phys_avail[indx + 1] - 1, 228 (uintmax_t)size1, (uintmax_t)size1 / PAGE_SIZE); 229 } 230 } 231 232 vm_ksubmap_init(&kmi); 233 234 printf("avail memory = %ju (%ju MB)\n", 235 ptoa((uintmax_t)vm_free_count()), 236 ptoa((uintmax_t)vm_free_count()) / 1048576); 237 238 /* 239 * Set up buffers, so they can be used to read disk labels. 240 */ 241 bufinit(); 242 vm_pager_bufferinit(); 243 } 244 245 extern vm_offset_t __startkernel, __endkernel; 246 extern unsigned char __bss_start[]; 247 extern unsigned char __sbss_start[]; 248 extern unsigned char __sbss_end[]; 249 extern unsigned char _end[]; 250 251 void aim_early_init(vm_offset_t fdt, vm_offset_t toc, vm_offset_t ofentry, 252 void *mdp, uint32_t mdp_cookie); 253 void aim_cpu_init(vm_offset_t toc); 254 void booke_cpu_init(void); 255 256 #ifdef DDB 257 static void load_external_symtab(void); 258 #endif 259 260 uintptr_t 261 powerpc_init(vm_offset_t fdt, vm_offset_t toc, vm_offset_t ofentry, void *mdp, 262 uint32_t mdp_cookie) 263 { 264 struct pcpu *pc; 265 struct cpuref bsp; 266 vm_offset_t startkernel, endkernel; 267 char *env; 268 void *kmdp = NULL; 269 bool ofw_bootargs = false; 270 #ifdef DDB 271 bool symbols_provided = false; 272 vm_offset_t ksym_start; 273 vm_offset_t ksym_end; 274 #endif 275 276 /* First guess at start/end kernel positions */ 277 startkernel = __startkernel; 278 endkernel = __endkernel; 279 280 /* 281 * If the metadata pointer cookie is not set to the magic value, 282 * the number in mdp should be treated as nonsense. 283 */ 284 if (mdp_cookie != 0xfb5d104d) 285 mdp = NULL; 286 287 #if !defined(BOOKE) 288 /* 289 * On BOOKE the BSS is already cleared and some variables 290 * initialized. Do not wipe them out. 291 */ 292 bzero(__sbss_start, __sbss_end - __sbss_start); 293 bzero(__bss_start, _end - __bss_start); 294 #endif 295 296 cpu_feature_setup(); 297 298 #ifdef AIM 299 aim_early_init(fdt, toc, ofentry, mdp, mdp_cookie); 300 #endif 301 302 /* 303 * At this point, we are executing in our correct memory space. 304 * Book-E started there, and AIM has done an rfi and restarted 305 * execution from _start. 306 * 307 * We may still be in real mode, however. If we are running out of 308 * the direct map on 64 bit, this is possible to do. 309 */ 310 311 /* 312 * Parse metadata if present and fetch parameters. Must be done 313 * before console is inited so cninit gets the right value of 314 * boothowto. 315 */ 316 if (mdp != NULL) { 317 /* 318 * Starting up from loader. 319 * 320 * Full metadata has been provided, but we need to figure 321 * out the correct address to relocate it to. 322 */ 323 char *envp = NULL; 324 uintptr_t md_offset = 0; 325 vm_paddr_t kernelendphys; 326 327 #ifdef AIM 328 if ((uintptr_t)&powerpc_init > DMAP_BASE_ADDRESS) 329 md_offset = DMAP_BASE_ADDRESS; 330 #else /* BOOKE */ 331 md_offset = VM_MIN_KERNEL_ADDRESS - kernload; 332 #endif 333 334 preload_metadata = mdp; 335 if (md_offset > 0) { 336 /* Translate phys offset into DMAP offset. */ 337 preload_metadata += md_offset; 338 preload_bootstrap_relocate(md_offset); 339 } 340 kmdp = preload_search_by_type("elf kernel"); 341 if (kmdp != NULL) { 342 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 343 envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *); 344 if (envp != NULL) 345 envp += md_offset; 346 init_static_kenv(envp, 0); 347 if (fdt == 0) { 348 fdt = MD_FETCH(kmdp, MODINFOMD_DTBP, uintptr_t); 349 if (fdt != 0) 350 fdt += md_offset; 351 } 352 /* kernelstartphys is already relocated. */ 353 kernelendphys = MD_FETCH(kmdp, MODINFOMD_KERNEND, 354 vm_offset_t); 355 if (kernelendphys != 0) 356 kernelendphys += md_offset; 357 endkernel = ulmax(endkernel, kernelendphys); 358 #ifdef DDB 359 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t); 360 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t); 361 362 db_fetch_ksymtab(ksym_start, ksym_end, md_offset); 363 /* Symbols provided by loader. */ 364 symbols_provided = true; 365 #endif 366 } 367 } else { 368 /* 369 * Self-loading kernel, we have to fake up metadata. 370 * 371 * Since we are creating the metadata from the final 372 * memory space, we don't need to call 373 * preload_boostrap_relocate(). 374 */ 375 fake_preload_metadata(); 376 kmdp = preload_search_by_type("elf kernel"); 377 init_static_kenv(init_kenv, sizeof(init_kenv)); 378 ofw_bootargs = true; 379 } 380 381 /* Store boot environment state */ 382 OF_initial_setup((void *)fdt, NULL, (int (*)(void *))ofentry); 383 384 /* 385 * Init params/tunables that can be overridden by the loader 386 */ 387 init_param1(); 388 389 /* 390 * Start initializing proc0 and thread0. 391 */ 392 proc_linkup0(&proc0, &thread0); 393 thread0.td_frame = &frame0; 394 #ifdef __powerpc64__ 395 __asm __volatile("mr 13,%0" :: "r"(&thread0)); 396 #else 397 __asm __volatile("mr 2,%0" :: "r"(&thread0)); 398 #endif 399 400 /* 401 * Init mutexes, which we use heavily in PMAP 402 */ 403 mutex_init(); 404 405 /* 406 * Install the OF client interface 407 */ 408 OF_bootstrap(); 409 410 #ifdef DDB 411 if (!symbols_provided && hw_direct_map) 412 load_external_symtab(); 413 #endif 414 415 if (ofw_bootargs) 416 ofw_parse_bootargs(); 417 418 #ifdef AIM 419 /* 420 * Early I/O map needs to be initialized before console, in order to 421 * map frame buffers properly, and after boot args have been parsed, 422 * to handle tunables properly. 423 */ 424 pmap_early_io_map_init(); 425 #endif 426 427 /* 428 * Initialize the console before printing anything. 429 */ 430 cninit(); 431 432 #ifdef AIM 433 aim_cpu_init(toc); 434 #else /* BOOKE */ 435 booke_cpu_init(); 436 437 /* Make sure the kernel icache is valid before we go too much further */ 438 __syncicache((caddr_t)startkernel, endkernel - startkernel); 439 #endif 440 441 /* 442 * Choose a platform module so we can get the physical memory map. 443 */ 444 445 platform_probe_and_attach(); 446 447 /* 448 * Set up per-cpu data for the BSP now that the platform can tell 449 * us which that is. 450 */ 451 if (platform_smp_get_bsp(&bsp) != 0) 452 bsp.cr_cpuid = 0; 453 pc = &__pcpu[bsp.cr_cpuid]; 454 __asm __volatile("mtsprg 0, %0" :: "r"(pc)); 455 pcpu_init(pc, bsp.cr_cpuid, sizeof(struct pcpu)); 456 pc->pc_curthread = &thread0; 457 thread0.td_oncpu = bsp.cr_cpuid; 458 pc->pc_cpuid = bsp.cr_cpuid; 459 pc->pc_hwref = bsp.cr_hwref; 460 461 /* 462 * Init KDB 463 */ 464 kdb_init(); 465 466 /* 467 * Bring up MMU 468 */ 469 pmap_mmu_init(); 470 link_elf_ireloc(kmdp); 471 pmap_bootstrap(startkernel, endkernel); 472 mtmsr(psl_kernset & ~PSL_EE); 473 474 /* 475 * Initialize params/tunables that are derived from memsize 476 */ 477 init_param2(physmem); 478 479 /* 480 * Grab booted kernel's name 481 */ 482 env = kern_getenv("kernelname"); 483 if (env != NULL) { 484 strlcpy(kernelname, env, sizeof(kernelname)); 485 freeenv(env); 486 } 487 488 /* 489 * Finish setting up thread0. 490 */ 491 thread0.td_pcb = (struct pcb *) 492 ((thread0.td_kstack + thread0.td_kstack_pages * PAGE_SIZE - 493 sizeof(struct pcb)) & ~15UL); 494 bzero((void *)thread0.td_pcb, sizeof(struct pcb)); 495 pc->pc_curpcb = thread0.td_pcb; 496 497 /* Initialise the message buffer. */ 498 msgbufinit(msgbufp, msgbufsize); 499 500 #ifdef KDB 501 if (boothowto & RB_KDB) 502 kdb_enter(KDB_WHY_BOOTFLAGS, 503 "Boot flags requested debugger"); 504 #endif 505 506 return (((uintptr_t)thread0.td_pcb - 507 (sizeof(struct callframe) - 3*sizeof(register_t))) & ~15UL); 508 } 509 510 #ifdef DDB 511 /* 512 * On powernv and some booke systems, we might not have symbols loaded via 513 * loader. However, if the user passed the kernel in as the initrd as well, 514 * we can manually load it via reinterpreting the initrd copy of the kernel. 515 * 516 * In the BOOKE case, we don't actually have a DMAP yet, so we have to use 517 * temporary maps to inspect the memory, but write DMAP addresses to the 518 * configuration variables. 519 */ 520 static void 521 load_external_symtab(void) { 522 phandle_t chosen; 523 vm_paddr_t start, end; 524 pcell_t cell[2]; 525 ssize_t size; 526 u_char *kernelimg; /* Temporary map */ 527 u_char *kernelimg_final; /* Final location */ 528 529 int i; 530 531 Elf_Ehdr *ehdr; 532 Elf_Shdr *shdr; 533 534 vm_offset_t ksym_start, ksym_sz, kstr_start, kstr_sz, 535 ksym_start_final, kstr_start_final; 536 537 if (!hw_direct_map) 538 return; 539 540 chosen = OF_finddevice("/chosen"); 541 if (chosen <= 0) 542 return; 543 544 if (!OF_hasprop(chosen, "linux,initrd-start") || 545 !OF_hasprop(chosen, "linux,initrd-end")) 546 return; 547 548 size = OF_getencprop(chosen, "linux,initrd-start", cell, sizeof(cell)); 549 if (size == 4) 550 start = cell[0]; 551 else if (size == 8) 552 start = (uint64_t)cell[0] << 32 | cell[1]; 553 else 554 return; 555 556 size = OF_getencprop(chosen, "linux,initrd-end", cell, sizeof(cell)); 557 if (size == 4) 558 end = cell[0]; 559 else if (size == 8) 560 end = (uint64_t)cell[0] << 32 | cell[1]; 561 else 562 return; 563 564 if (!(end - start > 0)) 565 return; 566 567 kernelimg_final = (u_char *) PHYS_TO_DMAP(start); 568 #ifdef AIM 569 kernelimg = kernelimg_final; 570 #else /* BOOKE */ 571 kernelimg = (u_char *)pmap_early_io_map(start, PAGE_SIZE); 572 #endif 573 ehdr = (Elf_Ehdr *)kernelimg; 574 575 if (!IS_ELF(*ehdr)) { 576 #ifdef BOOKE 577 pmap_early_io_unmap(start, PAGE_SIZE); 578 #endif 579 return; 580 } 581 582 #ifdef BOOKE 583 pmap_early_io_unmap(start, PAGE_SIZE); 584 kernelimg = (u_char *)pmap_early_io_map(start, (end - start)); 585 #endif 586 587 shdr = (Elf_Shdr *)(kernelimg + ehdr->e_shoff); 588 589 ksym_start = 0; 590 ksym_sz = 0; 591 ksym_start_final = 0; 592 kstr_start = 0; 593 kstr_sz = 0; 594 kstr_start_final = 0; 595 for (i = 0; i < ehdr->e_shnum; i++) { 596 if (shdr[i].sh_type == SHT_SYMTAB) { 597 ksym_start = (vm_offset_t)(kernelimg + 598 shdr[i].sh_offset); 599 ksym_start_final = (vm_offset_t) 600 (kernelimg_final + shdr[i].sh_offset); 601 ksym_sz = (vm_offset_t)(shdr[i].sh_size); 602 kstr_start = (vm_offset_t)(kernelimg + 603 shdr[shdr[i].sh_link].sh_offset); 604 kstr_start_final = (vm_offset_t) 605 (kernelimg_final + 606 shdr[shdr[i].sh_link].sh_offset); 607 608 kstr_sz = (vm_offset_t) 609 (shdr[shdr[i].sh_link].sh_size); 610 } 611 } 612 613 if (ksym_start != 0 && kstr_start != 0 && ksym_sz != 0 && 614 kstr_sz != 0 && ksym_start < kstr_start) { 615 /* 616 * We can't use db_fetch_ksymtab() here, because we need to 617 * feed in DMAP addresses that are not mapped yet on booke. 618 * 619 * Write the variables directly, where db_init() will pick 620 * them up later, after the DMAP is up. 621 */ 622 ksymtab = ksym_start_final; 623 ksymtab_size = ksym_sz; 624 kstrtab = kstr_start_final; 625 ksymtab_relbase = (__startkernel - KERNBASE); 626 } 627 628 #ifdef BOOKE 629 pmap_early_io_unmap(start, (end - start)); 630 #endif 631 632 }; 633 #endif 634 635 /* 636 * When not being loaded from loader, we need to create our own metadata 637 * so we can interact with the kernel linker. 638 */ 639 static void 640 fake_preload_metadata(void) { 641 /* We depend on dword alignment here. */ 642 static uint32_t fake_preload[36] __aligned(8); 643 int i = 0; 644 645 fake_preload[i++] = MODINFO_NAME; 646 fake_preload[i++] = strlen("kernel") + 1; 647 strcpy((char*)&fake_preload[i], "kernel"); 648 /* ['k' 'e' 'r' 'n'] ['e' 'l' '\0' ..] */ 649 i += 2; 650 651 fake_preload[i++] = MODINFO_TYPE; 652 fake_preload[i++] = strlen("elf kernel") + 1; 653 strcpy((char*)&fake_preload[i], "elf kernel"); 654 /* ['e' 'l' 'f' ' '] ['k' 'e' 'r' 'n'] ['e' 'l' '\0' ..] */ 655 i += 3; 656 657 #ifdef __powerpc64__ 658 /* Padding -- Fields start on u_long boundaries */ 659 fake_preload[i++] = 0; 660 #endif 661 662 fake_preload[i++] = MODINFO_ADDR; 663 fake_preload[i++] = sizeof(vm_offset_t); 664 *(vm_offset_t *)&fake_preload[i] = 665 (vm_offset_t)(__startkernel); 666 i += (sizeof(vm_offset_t) / 4); 667 668 fake_preload[i++] = MODINFO_SIZE; 669 fake_preload[i++] = sizeof(vm_offset_t); 670 *(vm_offset_t *)&fake_preload[i] = 671 (vm_offset_t)(__endkernel) - (vm_offset_t)(__startkernel); 672 i += (sizeof(vm_offset_t) / 4); 673 674 /* 675 * MODINFOMD_SSYM and MODINFOMD_ESYM cannot be provided here, 676 * as the memory comes from outside the loaded ELF sections. 677 * 678 * If the symbols are being provided by other means (MFS), the 679 * tables will be loaded into the debugger directly. 680 */ 681 682 /* Null field at end to mark end of data. */ 683 fake_preload[i++] = 0; 684 fake_preload[i] = 0; 685 preload_metadata = (void*)fake_preload; 686 } 687 688 /* 689 * Flush the D-cache for non-DMA I/O so that the I-cache can 690 * be made coherent later. 691 */ 692 void 693 cpu_flush_dcache(void *ptr, size_t len) 694 { 695 register_t addr, off; 696 697 /* 698 * Align the address to a cacheline and adjust the length 699 * accordingly. Then round the length to a multiple of the 700 * cacheline for easy looping. 701 */ 702 addr = (uintptr_t)ptr; 703 off = addr & (cacheline_size - 1); 704 addr -= off; 705 len = roundup2(len + off, cacheline_size); 706 707 while (len > 0) { 708 __asm __volatile ("dcbf 0,%0" :: "r"(addr)); 709 __asm __volatile ("sync"); 710 addr += cacheline_size; 711 len -= cacheline_size; 712 } 713 } 714 715 int 716 ptrace_set_pc(struct thread *td, unsigned long addr) 717 { 718 struct trapframe *tf; 719 720 tf = td->td_frame; 721 tf->srr0 = (register_t)addr; 722 723 return (0); 724 } 725 726 void 727 spinlock_enter(void) 728 { 729 struct thread *td; 730 register_t msr; 731 732 td = curthread; 733 if (td->td_md.md_spinlock_count == 0) { 734 nop_prio_mhigh(); 735 msr = intr_disable(); 736 td->td_md.md_spinlock_count = 1; 737 td->td_md.md_saved_msr = msr; 738 critical_enter(); 739 } else 740 td->td_md.md_spinlock_count++; 741 } 742 743 void 744 spinlock_exit(void) 745 { 746 struct thread *td; 747 register_t msr; 748 749 td = curthread; 750 msr = td->td_md.md_saved_msr; 751 td->td_md.md_spinlock_count--; 752 if (td->td_md.md_spinlock_count == 0) { 753 critical_exit(); 754 intr_restore(msr); 755 nop_prio_medium(); 756 } 757 } 758 759 /* 760 * Simple ddb(4) command/hack to view any SPR on the running CPU. 761 * Uses a trivial asm function to perform the mfspr, and rewrites the mfspr 762 * instruction each time. 763 * XXX: Since it uses code modification, it won't work if the kernel code pages 764 * are marked RO. 765 */ 766 extern register_t get_spr(int); 767 768 #ifdef DDB 769 DB_SHOW_COMMAND(spr, db_show_spr) 770 { 771 register_t spr; 772 volatile uint32_t *p; 773 int sprno, saved_sprno; 774 775 if (!have_addr) 776 return; 777 778 saved_sprno = sprno = (intptr_t) addr; 779 sprno = ((sprno & 0x3e0) >> 5) | ((sprno & 0x1f) << 5); 780 p = (uint32_t *)(void *)&get_spr; 781 #ifdef __powerpc64__ 782 #if defined(_CALL_ELF) && _CALL_ELF == 2 783 /* Account for ELFv2 function prologue. */ 784 p += 2; 785 #else 786 p = *(volatile uint32_t * volatile *)p; 787 #endif 788 #endif 789 *p = (*p & ~0x001ff800) | (sprno << 11); 790 __syncicache(__DEVOLATILE(uint32_t *, p), cacheline_size); 791 spr = get_spr(sprno); 792 793 db_printf("SPR %d(%x): %lx\n", saved_sprno, saved_sprno, 794 (unsigned long)spr); 795 } 796 797 DB_SHOW_COMMAND(frame, db_show_frame) 798 { 799 struct trapframe *tf; 800 long reg; 801 int i; 802 803 tf = have_addr ? (struct trapframe *)addr : curthread->td_frame; 804 805 /* 806 * Everything casts through long to simplify the printing. 807 * 'long' is native register size anyway. 808 */ 809 db_printf("trap frame %p\n", tf); 810 for (i = 0; i < nitems(tf->fixreg); i++) { 811 reg = tf->fixreg[i]; 812 db_printf(" r%d:\t%#lx (%ld)\n", i, reg, reg); 813 } 814 reg = tf->lr; 815 db_printf(" lr:\t%#lx\n", reg); 816 reg = tf->cr; 817 db_printf(" cr:\t%#lx\n", reg); 818 reg = tf->xer; 819 db_printf(" xer:\t%#lx\n", reg); 820 reg = tf->ctr; 821 db_printf(" ctr:\t%#lx (%ld)\n", reg, reg); 822 reg = tf->srr0; 823 db_printf(" srr0:\t%#lx\n", reg); 824 reg = tf->srr1; 825 db_printf(" srr1:\t%#lx\n", reg); 826 reg = tf->exc; 827 db_printf(" exc:\t%#lx\n", reg); 828 reg = tf->dar; 829 db_printf(" dar:\t%#lx\n", reg); 830 #ifdef AIM 831 reg = tf->cpu.aim.dsisr; 832 db_printf(" dsisr:\t%#lx\n", reg); 833 #else 834 reg = tf->cpu.booke.esr; 835 db_printf(" esr:\t%#lx\n", reg); 836 reg = tf->cpu.booke.dbcr0; 837 db_printf(" dbcr0:\t%#lx\n", reg); 838 #endif 839 } 840 #endif 841 842 /* __stack_chk_fail_local() is called in secure-plt (32-bit). */ 843 #if !defined(__powerpc64__) 844 extern void __stack_chk_fail(void); 845 void __stack_chk_fail_local(void); 846 847 void 848 __stack_chk_fail_local(void) 849 { 850 851 __stack_chk_fail(); 852 } 853 #endif
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