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/rwlock.h> 87 #include <sys/signalvar.h> 88 #include <sys/syscallsubr.h> 89 #include <sys/sysctl.h> 90 #include <sys/sysent.h> 91 #include <sys/sysproto.h> 92 #include <sys/ucontext.h> 93 #include <sys/uio.h> 94 #include <sys/vmmeter.h> 95 #include <sys/vnode.h> 96 97 #include <net/netisr.h> 98 99 #include <vm/vm.h> 100 #include <vm/vm_extern.h> 101 #include <vm/vm_kern.h> 102 #include <vm/vm_page.h> 103 #include <vm/vm_phys.h> 104 #include <vm/vm_map.h> 105 #include <vm/vm_object.h> 106 #include <vm/vm_pager.h> 107 108 #include <machine/altivec.h> 109 #ifndef __powerpc64__ 110 #include <machine/bat.h> 111 #endif 112 #include <machine/cpu.h> 113 #include <machine/elf.h> 114 #include <machine/fpu.h> 115 #include <machine/hid.h> 116 #include <machine/ifunc.h> 117 #include <machine/kdb.h> 118 #include <machine/md_var.h> 119 #include <machine/metadata.h> 120 #include <machine/mmuvar.h> 121 #include <machine/pcb.h> 122 #include <machine/reg.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 int hw_direct_map = 1; 141 142 #ifdef BOOKE 143 extern vm_paddr_t kernload; 144 #endif 145 146 extern void *ap_pcpu; 147 148 struct pcpu __pcpu[MAXCPU] __aligned(PAGE_SIZE); 149 static char init_kenv[2048]; 150 151 static struct trapframe frame0; 152 153 char machine[] = "powerpc"; 154 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 155 156 static void cpu_startup(void *); 157 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); 158 159 SYSCTL_INT(_machdep, CPU_CACHELINE, cacheline_size, 160 CTLFLAG_RD, &cacheline_size, 0, ""); 161 162 uintptr_t powerpc_init(vm_offset_t, vm_offset_t, vm_offset_t, void *, 163 uint32_t); 164 165 static void fake_preload_metadata(void); 166 167 long Maxmem = 0; 168 long realmem = 0; 169 170 /* Default MSR values set in the AIM/Book-E early startup code */ 171 register_t psl_kernset; 172 register_t psl_userset; 173 register_t psl_userstatic; 174 #ifdef __powerpc64__ 175 register_t psl_userset32; 176 #endif 177 178 struct kva_md_info kmi; 179 180 static void 181 cpu_startup(void *dummy) 182 { 183 184 /* 185 * Initialise the decrementer-based clock. 186 */ 187 decr_init(); 188 189 /* 190 * Good {morning,afternoon,evening,night}. 191 */ 192 cpu_setup(PCPU_GET(cpuid)); 193 194 #ifdef PERFMON 195 perfmon_init(); 196 #endif 197 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)physmem), 198 ptoa((uintmax_t)physmem) / 1048576); 199 realmem = physmem; 200 201 if (bootverbose) 202 printf("available KVA = %zu (%zu MB)\n", 203 virtual_end - virtual_avail, 204 (virtual_end - virtual_avail) / 1048576); 205 206 /* 207 * Display any holes after the first chunk of extended memory. 208 */ 209 if (bootverbose) { 210 int indx; 211 212 printf("Physical memory chunk(s):\n"); 213 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 214 vm_paddr_t size1 = 215 phys_avail[indx + 1] - phys_avail[indx]; 216 217 #ifdef __powerpc64__ 218 printf("0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n", 219 #else 220 printf("0x%09jx - 0x%09jx, %ju bytes (%ju pages)\n", 221 #endif 222 (uintmax_t)phys_avail[indx], 223 (uintmax_t)phys_avail[indx + 1] - 1, 224 (uintmax_t)size1, (uintmax_t)size1 / PAGE_SIZE); 225 } 226 } 227 228 vm_ksubmap_init(&kmi); 229 230 printf("avail memory = %ju (%ju MB)\n", 231 ptoa((uintmax_t)vm_free_count()), 232 ptoa((uintmax_t)vm_free_count()) / 1048576); 233 234 /* 235 * Set up buffers, so they can be used to read disk labels. 236 */ 237 bufinit(); 238 vm_pager_bufferinit(); 239 } 240 241 extern vm_offset_t __startkernel, __endkernel; 242 extern unsigned char __bss_start[]; 243 extern unsigned char __sbss_start[]; 244 extern unsigned char __sbss_end[]; 245 extern unsigned char _end[]; 246 247 void aim_early_init(vm_offset_t fdt, vm_offset_t toc, vm_offset_t ofentry, 248 void *mdp, uint32_t mdp_cookie); 249 void aim_cpu_init(vm_offset_t toc); 250 void booke_cpu_init(void); 251 252 #ifdef DDB 253 static void load_external_symtab(void); 254 #endif 255 256 uintptr_t 257 powerpc_init(vm_offset_t fdt, vm_offset_t toc, vm_offset_t ofentry, void *mdp, 258 uint32_t mdp_cookie) 259 { 260 struct pcpu *pc; 261 struct cpuref bsp; 262 vm_offset_t startkernel, endkernel; 263 char *env; 264 void *kmdp = NULL; 265 bool ofw_bootargs = false; 266 #ifdef DDB 267 bool symbols_provided = false; 268 vm_offset_t ksym_start; 269 vm_offset_t ksym_end; 270 vm_offset_t ksym_sz; 271 #endif 272 273 /* First guess at start/end kernel positions */ 274 startkernel = __startkernel; 275 endkernel = __endkernel; 276 277 /* 278 * If the metadata pointer cookie is not set to the magic value, 279 * the number in mdp should be treated as nonsense. 280 */ 281 if (mdp_cookie != 0xfb5d104d) 282 mdp = NULL; 283 284 #if !defined(BOOKE) 285 /* 286 * On BOOKE the BSS is already cleared and some variables 287 * initialized. Do not wipe them out. 288 */ 289 bzero(__sbss_start, __sbss_end - __sbss_start); 290 bzero(__bss_start, _end - __bss_start); 291 #endif 292 293 cpu_feature_setup(); 294 295 #ifdef AIM 296 aim_early_init(fdt, toc, ofentry, mdp, mdp_cookie); 297 #endif 298 299 /* 300 * At this point, we are executing in our correct memory space. 301 * Book-E started there, and AIM has done an rfi and restarted 302 * execution from _start. 303 * 304 * We may still be in real mode, however. If we are running out of 305 * the direct map on 64 bit, this is possible to do. 306 */ 307 308 /* 309 * Parse metadata if present and fetch parameters. Must be done 310 * before console is inited so cninit gets the right value of 311 * boothowto. 312 */ 313 if (mdp != NULL) { 314 /* 315 * Starting up from loader. 316 * 317 * Full metadata has been provided, but we need to figure 318 * out the correct address to relocate it to. 319 */ 320 char *envp = NULL; 321 uintptr_t md_offset = 0; 322 vm_paddr_t kernelstartphys, kernelendphys; 323 324 #ifdef AIM 325 if ((uintptr_t)&powerpc_init > DMAP_BASE_ADDRESS) 326 md_offset = DMAP_BASE_ADDRESS; 327 #else /* BOOKE */ 328 md_offset = VM_MIN_KERNEL_ADDRESS - kernload; 329 #endif 330 331 preload_metadata = mdp; 332 if (md_offset > 0) { 333 /* Translate phys offset into DMAP offset. */ 334 preload_metadata += md_offset; 335 preload_bootstrap_relocate(md_offset); 336 } 337 kmdp = preload_search_by_type("elf kernel"); 338 if (kmdp != NULL) { 339 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 340 envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *); 341 if (envp != NULL) 342 envp += md_offset; 343 init_static_kenv(envp, 0); 344 if (fdt == 0) { 345 fdt = MD_FETCH(kmdp, MODINFOMD_DTBP, uintptr_t); 346 if (fdt != 0) 347 fdt += md_offset; 348 } 349 kernelstartphys = MD_FETCH(kmdp, MODINFO_ADDR, 350 vm_offset_t); 351 /* kernelstartphys is already relocated. */ 352 kernelendphys = MD_FETCH(kmdp, MODINFOMD_KERNEND, 353 vm_offset_t); 354 if (kernelendphys != 0) 355 kernelendphys += md_offset; 356 endkernel = ulmax(endkernel, kernelendphys); 357 #ifdef DDB 358 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t); 359 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t); 360 ksym_sz = *(Elf_Size*)ksym_start; 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_Phdr *phdr; 533 Elf_Shdr *shdr; 534 535 vm_offset_t ksym_start, ksym_sz, kstr_start, kstr_sz, 536 ksym_start_final, kstr_start_final; 537 538 if (!hw_direct_map) 539 return; 540 541 chosen = OF_finddevice("/chosen"); 542 if (chosen <= 0) 543 return; 544 545 if (!OF_hasprop(chosen, "linux,initrd-start") || 546 !OF_hasprop(chosen, "linux,initrd-end")) 547 return; 548 549 size = OF_getencprop(chosen, "linux,initrd-start", cell, sizeof(cell)); 550 if (size == 4) 551 start = cell[0]; 552 else if (size == 8) 553 start = (uint64_t)cell[0] << 32 | cell[1]; 554 else 555 return; 556 557 size = OF_getencprop(chosen, "linux,initrd-end", cell, sizeof(cell)); 558 if (size == 4) 559 end = cell[0]; 560 else if (size == 8) 561 end = (uint64_t)cell[0] << 32 | cell[1]; 562 else 563 return; 564 565 if (!(end - start > 0)) 566 return; 567 568 kernelimg_final = (u_char *) PHYS_TO_DMAP(start); 569 #ifdef AIM 570 kernelimg = kernelimg_final; 571 #else /* BOOKE */ 572 kernelimg = (u_char *)pmap_early_io_map(start, PAGE_SIZE); 573 #endif 574 ehdr = (Elf_Ehdr *)kernelimg; 575 576 if (!IS_ELF(*ehdr)) { 577 #ifdef BOOKE 578 pmap_early_io_unmap(start, PAGE_SIZE); 579 #endif 580 return; 581 } 582 583 #ifdef BOOKE 584 pmap_early_io_unmap(start, PAGE_SIZE); 585 kernelimg = (u_char *)pmap_early_io_map(start, (end - start)); 586 #endif 587 588 phdr = (Elf_Phdr *)(kernelimg + ehdr->e_phoff); 589 shdr = (Elf_Shdr *)(kernelimg + ehdr->e_shoff); 590 591 ksym_start = 0; 592 ksym_sz = 0; 593 ksym_start_final = 0; 594 kstr_start = 0; 595 kstr_sz = 0; 596 kstr_start_final = 0; 597 for (i = 0; i < ehdr->e_shnum; i++) { 598 if (shdr[i].sh_type == SHT_SYMTAB) { 599 ksym_start = (vm_offset_t)(kernelimg + 600 shdr[i].sh_offset); 601 ksym_start_final = (vm_offset_t) 602 (kernelimg_final + shdr[i].sh_offset); 603 ksym_sz = (vm_offset_t)(shdr[i].sh_size); 604 kstr_start = (vm_offset_t)(kernelimg + 605 shdr[shdr[i].sh_link].sh_offset); 606 kstr_start_final = (vm_offset_t) 607 (kernelimg_final + 608 shdr[shdr[i].sh_link].sh_offset); 609 610 kstr_sz = (vm_offset_t) 611 (shdr[shdr[i].sh_link].sh_size); 612 } 613 } 614 615 if (ksym_start != 0 && kstr_start != 0 && ksym_sz != 0 && 616 kstr_sz != 0 && ksym_start < kstr_start) { 617 /* 618 * We can't use db_fetch_ksymtab() here, because we need to 619 * feed in DMAP addresses that are not mapped yet on booke. 620 * 621 * Write the variables directly, where db_init() will pick 622 * them up later, after the DMAP is up. 623 */ 624 ksymtab = ksym_start_final; 625 ksymtab_size = ksym_sz; 626 kstrtab = kstr_start_final; 627 ksymtab_relbase = (__startkernel - KERNBASE); 628 } 629 630 #ifdef BOOKE 631 pmap_early_io_unmap(start, (end - start)); 632 #endif 633 634 }; 635 #endif 636 637 /* 638 * When not being loaded from loader, we need to create our own metadata 639 * so we can interact with the kernel linker. 640 */ 641 static void 642 fake_preload_metadata(void) { 643 /* We depend on dword alignment here. */ 644 static uint32_t fake_preload[36] __aligned(8); 645 int i = 0; 646 647 fake_preload[i++] = MODINFO_NAME; 648 fake_preload[i++] = strlen("kernel") + 1; 649 strcpy((char*)&fake_preload[i], "kernel"); 650 /* ['k' 'e' 'r' 'n'] ['e' 'l' '\0' ..] */ 651 i += 2; 652 653 fake_preload[i++] = MODINFO_TYPE; 654 fake_preload[i++] = strlen("elf kernel") + 1; 655 strcpy((char*)&fake_preload[i], "elf kernel"); 656 /* ['e' 'l' 'f' ' '] ['k' 'e' 'r' 'n'] ['e' 'l' '\0' ..] */ 657 i += 3; 658 659 #ifdef __powerpc64__ 660 /* Padding -- Fields start on u_long boundaries */ 661 fake_preload[i++] = 0; 662 #endif 663 664 fake_preload[i++] = MODINFO_ADDR; 665 fake_preload[i++] = sizeof(vm_offset_t); 666 *(vm_offset_t *)&fake_preload[i] = 667 (vm_offset_t)(__startkernel); 668 i += (sizeof(vm_offset_t) / 4); 669 670 fake_preload[i++] = MODINFO_SIZE; 671 fake_preload[i++] = sizeof(vm_offset_t); 672 *(vm_offset_t *)&fake_preload[i] = 673 (vm_offset_t)(__endkernel) - (vm_offset_t)(__startkernel); 674 i += (sizeof(vm_offset_t) / 4); 675 676 /* 677 * MODINFOMD_SSYM and MODINFOMD_ESYM cannot be provided here, 678 * as the memory comes from outside the loaded ELF sections. 679 * 680 * If the symbols are being provided by other means (MFS), the 681 * tables will be loaded into the debugger directly. 682 */ 683 684 /* Null field at end to mark end of data. */ 685 fake_preload[i++] = 0; 686 fake_preload[i] = 0; 687 preload_metadata = (void*)fake_preload; 688 } 689 690 /* 691 * Flush the D-cache for non-DMA I/O so that the I-cache can 692 * be made coherent later. 693 */ 694 void 695 cpu_flush_dcache(void *ptr, size_t len) 696 { 697 register_t addr, off; 698 699 /* 700 * Align the address to a cacheline and adjust the length 701 * accordingly. Then round the length to a multiple of the 702 * cacheline for easy looping. 703 */ 704 addr = (uintptr_t)ptr; 705 off = addr & (cacheline_size - 1); 706 addr -= off; 707 len = roundup2(len + off, cacheline_size); 708 709 while (len > 0) { 710 __asm __volatile ("dcbf 0,%0" :: "r"(addr)); 711 __asm __volatile ("sync"); 712 addr += cacheline_size; 713 len -= cacheline_size; 714 } 715 } 716 717 int 718 ptrace_set_pc(struct thread *td, unsigned long addr) 719 { 720 struct trapframe *tf; 721 722 tf = td->td_frame; 723 tf->srr0 = (register_t)addr; 724 725 return (0); 726 } 727 728 void 729 spinlock_enter(void) 730 { 731 struct thread *td; 732 register_t msr; 733 734 td = curthread; 735 if (td->td_md.md_spinlock_count == 0) { 736 nop_prio_mhigh(); 737 msr = intr_disable(); 738 td->td_md.md_spinlock_count = 1; 739 td->td_md.md_saved_msr = msr; 740 critical_enter(); 741 } else 742 td->td_md.md_spinlock_count++; 743 } 744 745 void 746 spinlock_exit(void) 747 { 748 struct thread *td; 749 register_t msr; 750 751 td = curthread; 752 msr = td->td_md.md_saved_msr; 753 td->td_md.md_spinlock_count--; 754 if (td->td_md.md_spinlock_count == 0) { 755 critical_exit(); 756 intr_restore(msr); 757 nop_prio_medium(); 758 } 759 } 760 761 /* 762 * Simple ddb(4) command/hack to view any SPR on the running CPU. 763 * Uses a trivial asm function to perform the mfspr, and rewrites the mfspr 764 * instruction each time. 765 * XXX: Since it uses code modification, it won't work if the kernel code pages 766 * are marked RO. 767 */ 768 extern register_t get_spr(int); 769 770 #ifdef DDB 771 DB_SHOW_COMMAND(spr, db_show_spr) 772 { 773 register_t spr; 774 volatile uint32_t *p; 775 int sprno, saved_sprno; 776 777 if (!have_addr) 778 return; 779 780 saved_sprno = sprno = (intptr_t) addr; 781 sprno = ((sprno & 0x3e0) >> 5) | ((sprno & 0x1f) << 5); 782 p = (uint32_t *)(void *)&get_spr; 783 #ifdef __powerpc64__ 784 #if defined(_CALL_ELF) && _CALL_ELF == 2 785 /* Account for ELFv2 function prologue. */ 786 p += 2; 787 #else 788 p = *(volatile uint32_t * volatile *)p; 789 #endif 790 #endif 791 *p = (*p & ~0x001ff800) | (sprno << 11); 792 __syncicache(__DEVOLATILE(uint32_t *, p), cacheline_size); 793 spr = get_spr(sprno); 794 795 db_printf("SPR %d(%x): %lx\n", saved_sprno, saved_sprno, 796 (unsigned long)spr); 797 } 798 799 DB_SHOW_COMMAND(frame, db_show_frame) 800 { 801 struct trapframe *tf; 802 long reg; 803 int i; 804 805 tf = have_addr ? (struct trapframe *)addr : curthread->td_frame; 806 807 /* 808 * Everything casts through long to simplify the printing. 809 * 'long' is native register size anyway. 810 */ 811 db_printf("trap frame %p\n", tf); 812 for (i = 0; i < nitems(tf->fixreg); i++) { 813 reg = tf->fixreg[i]; 814 db_printf(" r%d:\t%#lx (%ld)\n", i, reg, reg); 815 } 816 reg = tf->lr; 817 db_printf(" lr:\t%#lx\n", reg); 818 reg = tf->cr; 819 db_printf(" cr:\t%#lx\n", reg); 820 reg = tf->xer; 821 db_printf(" xer:\t%#lx\n", reg); 822 reg = tf->ctr; 823 db_printf(" ctr:\t%#lx (%ld)\n", reg, reg); 824 reg = tf->srr0; 825 db_printf(" srr0:\t%#lx\n", reg); 826 reg = tf->srr1; 827 db_printf(" srr1:\t%#lx\n", reg); 828 reg = tf->exc; 829 db_printf(" exc:\t%#lx\n", reg); 830 reg = tf->dar; 831 db_printf(" dar:\t%#lx\n", reg); 832 #ifdef AIM 833 reg = tf->cpu.aim.dsisr; 834 db_printf(" dsisr:\t%#lx\n", reg); 835 #else 836 reg = tf->cpu.booke.esr; 837 db_printf(" esr:\t%#lx\n", reg); 838 reg = tf->cpu.booke.dbcr0; 839 db_printf(" dbcr0:\t%#lx\n", reg); 840 #endif 841 } 842 #endif 843 844 #undef bzero 845 void 846 bzero(void *buf, size_t len) 847 { 848 caddr_t p; 849 850 p = buf; 851 852 while (((vm_offset_t) p & (sizeof(u_long) - 1)) && len) { 853 *p++ = 0; 854 len--; 855 } 856 857 while (len >= sizeof(u_long) * 8) { 858 *(u_long*) p = 0; 859 *((u_long*) p + 1) = 0; 860 *((u_long*) p + 2) = 0; 861 *((u_long*) p + 3) = 0; 862 len -= sizeof(u_long) * 8; 863 *((u_long*) p + 4) = 0; 864 *((u_long*) p + 5) = 0; 865 *((u_long*) p + 6) = 0; 866 *((u_long*) p + 7) = 0; 867 p += sizeof(u_long) * 8; 868 } 869 870 while (len >= sizeof(u_long)) { 871 *(u_long*) p = 0; 872 len -= sizeof(u_long); 873 p += sizeof(u_long); 874 } 875 876 while (len) { 877 *p++ = 0; 878 len--; 879 } 880 } 881 882 /* __stack_chk_fail_local() is called in secure-plt (32-bit). */ 883 #if !defined(__powerpc64__) 884 extern void __stack_chk_fail(void); 885 void __stack_chk_fail_local(void); 886 887 void 888 __stack_chk_fail_local(void) 889 { 890 891 __stack_chk_fail(); 892 } 893 #endif
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