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_compat.h" 61 #include "opt_ddb.h" 62 #include "opt_kstack_pages.h" 63 #include "opt_platform.h" 64 65 #include <sys/param.h> 66 #include <sys/proc.h> 67 #include <sys/systm.h> 68 #include <sys/bio.h> 69 #include <sys/buf.h> 70 #include <sys/bus.h> 71 #include <sys/cons.h> 72 #include <sys/cpu.h> 73 #include <sys/eventhandler.h> 74 #include <sys/exec.h> 75 #include <sys/imgact.h> 76 #include <sys/kdb.h> 77 #include <sys/kernel.h> 78 #include <sys/ktr.h> 79 #include <sys/linker.h> 80 #include <sys/lock.h> 81 #include <sys/malloc.h> 82 #include <sys/mbuf.h> 83 #include <sys/msgbuf.h> 84 #include <sys/mutex.h> 85 #include <sys/ptrace.h> 86 #include <sys/reboot.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_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/kdb.h> 117 #include <machine/md_var.h> 118 #include <machine/metadata.h> 119 #include <machine/mmuvar.h> 120 #include <machine/pcb.h> 121 #include <machine/reg.h> 122 #include <machine/sigframe.h> 123 #include <machine/spr.h> 124 #include <machine/trap.h> 125 #include <machine/vmparam.h> 126 #include <machine/ofw_machdep.h> 127 128 #include <ddb/ddb.h> 129 130 #include <dev/ofw/openfirm.h> 131 #include <dev/ofw/ofw_subr.h> 132 133 int cold = 1; 134 #ifdef __powerpc64__ 135 int cacheline_size = 128; 136 #else 137 int cacheline_size = 32; 138 #endif 139 int hw_direct_map = 1; 140 141 extern void *ap_pcpu; 142 143 struct pcpu __pcpu[MAXCPU]; 144 static char init_kenv[2048]; 145 146 static struct trapframe frame0; 147 148 char machine[] = "powerpc"; 149 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 150 151 static void cpu_startup(void *); 152 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); 153 154 SYSCTL_INT(_machdep, CPU_CACHELINE, cacheline_size, 155 CTLFLAG_RD, &cacheline_size, 0, ""); 156 157 uintptr_t powerpc_init(vm_offset_t, vm_offset_t, vm_offset_t, void *, 158 uint32_t); 159 160 long Maxmem = 0; 161 long realmem = 0; 162 163 /* Default MSR values set in the AIM/Book-E early startup code */ 164 register_t psl_kernset; 165 register_t psl_userset; 166 register_t psl_userstatic; 167 #ifdef __powerpc64__ 168 register_t psl_userset32; 169 #endif 170 171 struct kva_md_info kmi; 172 173 static void 174 cpu_startup(void *dummy) 175 { 176 177 /* 178 * Initialise the decrementer-based clock. 179 */ 180 decr_init(); 181 182 /* 183 * Good {morning,afternoon,evening,night}. 184 */ 185 cpu_setup(PCPU_GET(cpuid)); 186 187 #ifdef PERFMON 188 perfmon_init(); 189 #endif 190 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)physmem), 191 ptoa((uintmax_t)physmem) / 1048576); 192 realmem = physmem; 193 194 if (bootverbose) 195 printf("available KVA = %zu (%zu MB)\n", 196 virtual_end - virtual_avail, 197 (virtual_end - virtual_avail) / 1048576); 198 199 /* 200 * Display any holes after the first chunk of extended memory. 201 */ 202 if (bootverbose) { 203 int indx; 204 205 printf("Physical memory chunk(s):\n"); 206 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 207 vm_paddr_t size1 = 208 phys_avail[indx + 1] - phys_avail[indx]; 209 210 #ifdef __powerpc64__ 211 printf("0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n", 212 #else 213 printf("0x%09jx - 0x%09jx, %ju bytes (%ju pages)\n", 214 #endif 215 (uintmax_t)phys_avail[indx], 216 (uintmax_t)phys_avail[indx + 1] - 1, 217 (uintmax_t)size1, (uintmax_t)size1 / PAGE_SIZE); 218 } 219 } 220 221 vm_ksubmap_init(&kmi); 222 223 printf("avail memory = %ju (%ju MB)\n", 224 ptoa((uintmax_t)vm_free_count()), 225 ptoa((uintmax_t)vm_free_count()) / 1048576); 226 227 /* 228 * Set up buffers, so they can be used to read disk labels. 229 */ 230 bufinit(); 231 vm_pager_bufferinit(); 232 } 233 234 extern vm_offset_t __startkernel, __endkernel; 235 extern unsigned char __bss_start[]; 236 extern unsigned char __sbss_start[]; 237 extern unsigned char __sbss_end[]; 238 extern unsigned char _end[]; 239 240 void aim_cpu_init(vm_offset_t toc); 241 void booke_cpu_init(void); 242 243 uintptr_t 244 powerpc_init(vm_offset_t fdt, vm_offset_t toc, vm_offset_t ofentry, void *mdp, 245 uint32_t mdp_cookie) 246 { 247 struct pcpu *pc; 248 struct cpuref bsp; 249 vm_offset_t startkernel, endkernel; 250 void *kmdp; 251 char *env; 252 bool ofw_bootargs = false; 253 #ifdef DDB 254 vm_offset_t ksym_start; 255 vm_offset_t ksym_end; 256 #endif 257 258 kmdp = NULL; 259 260 /* First guess at start/end kernel positions */ 261 startkernel = __startkernel; 262 endkernel = __endkernel; 263 264 /* 265 * If the metadata pointer cookie is not set to the magic value, 266 * the number in mdp should be treated as nonsense. 267 */ 268 if (mdp_cookie != 0xfb5d104d) 269 mdp = NULL; 270 271 #if !defined(BOOKE) 272 /* 273 * On BOOKE the BSS is already cleared and some variables 274 * initialized. Do not wipe them out. 275 */ 276 bzero(__sbss_start, __sbss_end - __sbss_start); 277 bzero(__bss_start, _end - __bss_start); 278 #endif 279 280 #ifdef AIM 281 /* 282 * If running from an FDT, make sure we are in real mode to avoid 283 * tromping on firmware page tables. Everything in the kernel assumes 284 * 1:1 mappings out of firmware, so this won't break anything not 285 * already broken. This doesn't work if there is live OF, since OF 286 * may internally use non-1:1 mappings. 287 */ 288 if (ofentry == 0) 289 mtmsr(mfmsr() & ~(PSL_IR | PSL_DR)); 290 #endif 291 292 /* 293 * Parse metadata if present and fetch parameters. Must be done 294 * before console is inited so cninit gets the right value of 295 * boothowto. 296 */ 297 if (mdp != NULL) { 298 preload_metadata = mdp; 299 kmdp = preload_search_by_type("elf kernel"); 300 if (kmdp != NULL) { 301 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 302 init_static_kenv(MD_FETCH(kmdp, MODINFOMD_ENVP, char *), 303 0); 304 endkernel = ulmax(endkernel, MD_FETCH(kmdp, 305 MODINFOMD_KERNEND, vm_offset_t)); 306 #ifdef DDB 307 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t); 308 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t); 309 db_fetch_ksymtab(ksym_start, ksym_end); 310 #endif 311 } 312 } else { 313 init_static_kenv(init_kenv, sizeof(init_kenv)); 314 ofw_bootargs = true; 315 } 316 /* Store boot environment state */ 317 OF_initial_setup((void *)fdt, NULL, (int (*)(void *))ofentry); 318 319 /* 320 * Init params/tunables that can be overridden by the loader 321 */ 322 init_param1(); 323 324 /* 325 * Start initializing proc0 and thread0. 326 */ 327 proc_linkup0(&proc0, &thread0); 328 thread0.td_frame = &frame0; 329 #ifdef __powerpc64__ 330 __asm __volatile("mr 13,%0" :: "r"(&thread0)); 331 #else 332 __asm __volatile("mr 2,%0" :: "r"(&thread0)); 333 #endif 334 335 /* 336 * Init mutexes, which we use heavily in PMAP 337 */ 338 mutex_init(); 339 340 /* 341 * Install the OF client interface 342 */ 343 OF_bootstrap(); 344 345 if (ofw_bootargs) 346 ofw_parse_bootargs(); 347 348 /* 349 * Initialize the console before printing anything. 350 */ 351 cninit(); 352 353 #ifdef AIM 354 aim_cpu_init(toc); 355 #else /* BOOKE */ 356 booke_cpu_init(); 357 358 /* Make sure the kernel icache is valid before we go too much further */ 359 __syncicache((caddr_t)startkernel, endkernel - startkernel); 360 #endif 361 362 /* 363 * Choose a platform module so we can get the physical memory map. 364 */ 365 366 platform_probe_and_attach(); 367 368 /* 369 * Set up per-cpu data for the BSP now that the platform can tell 370 * us which that is. 371 */ 372 if (platform_smp_get_bsp(&bsp) != 0) 373 bsp.cr_cpuid = 0; 374 pc = &__pcpu[bsp.cr_cpuid]; 375 pcpu_init(pc, bsp.cr_cpuid, sizeof(struct pcpu)); 376 pc->pc_curthread = &thread0; 377 thread0.td_oncpu = bsp.cr_cpuid; 378 pc->pc_cpuid = bsp.cr_cpuid; 379 pc->pc_hwref = bsp.cr_hwref; 380 __asm __volatile("mtsprg 0, %0" :: "r"(pc)); 381 382 /* 383 * Init KDB 384 */ 385 kdb_init(); 386 387 /* 388 * Bring up MMU 389 */ 390 pmap_bootstrap(startkernel, endkernel); 391 mtmsr(psl_kernset & ~PSL_EE); 392 393 /* 394 * Initialize params/tunables that are derived from memsize 395 */ 396 init_param2(physmem); 397 398 /* 399 * Grab booted kernel's name 400 */ 401 env = kern_getenv("kernelname"); 402 if (env != NULL) { 403 strlcpy(kernelname, env, sizeof(kernelname)); 404 freeenv(env); 405 } 406 407 /* 408 * Finish setting up thread0. 409 */ 410 thread0.td_pcb = (struct pcb *) 411 ((thread0.td_kstack + thread0.td_kstack_pages * PAGE_SIZE - 412 sizeof(struct pcb)) & ~15UL); 413 bzero((void *)thread0.td_pcb, sizeof(struct pcb)); 414 pc->pc_curpcb = thread0.td_pcb; 415 416 /* Initialise the message buffer. */ 417 msgbufinit(msgbufp, msgbufsize); 418 419 #ifdef KDB 420 if (boothowto & RB_KDB) 421 kdb_enter(KDB_WHY_BOOTFLAGS, 422 "Boot flags requested debugger"); 423 #endif 424 425 return (((uintptr_t)thread0.td_pcb - 426 (sizeof(struct callframe) - 3*sizeof(register_t))) & ~15UL); 427 } 428 429 /* 430 * Flush the D-cache for non-DMA I/O so that the I-cache can 431 * be made coherent later. 432 */ 433 void 434 cpu_flush_dcache(void *ptr, size_t len) 435 { 436 register_t addr, off; 437 438 /* 439 * Align the address to a cacheline and adjust the length 440 * accordingly. Then round the length to a multiple of the 441 * cacheline for easy looping. 442 */ 443 addr = (uintptr_t)ptr; 444 off = addr & (cacheline_size - 1); 445 addr -= off; 446 len = roundup2(len + off, cacheline_size); 447 448 while (len > 0) { 449 __asm __volatile ("dcbf 0,%0" :: "r"(addr)); 450 __asm __volatile ("sync"); 451 addr += cacheline_size; 452 len -= cacheline_size; 453 } 454 } 455 456 int 457 ptrace_set_pc(struct thread *td, unsigned long addr) 458 { 459 struct trapframe *tf; 460 461 tf = td->td_frame; 462 tf->srr0 = (register_t)addr; 463 464 return (0); 465 } 466 467 void 468 spinlock_enter(void) 469 { 470 struct thread *td; 471 register_t msr; 472 473 td = curthread; 474 if (td->td_md.md_spinlock_count == 0) { 475 __asm __volatile("or 2,2,2"); /* Set high thread priority */ 476 msr = intr_disable(); 477 td->td_md.md_spinlock_count = 1; 478 td->td_md.md_saved_msr = msr; 479 } else 480 td->td_md.md_spinlock_count++; 481 critical_enter(); 482 } 483 484 void 485 spinlock_exit(void) 486 { 487 struct thread *td; 488 register_t msr; 489 490 td = curthread; 491 critical_exit(); 492 msr = td->td_md.md_saved_msr; 493 td->td_md.md_spinlock_count--; 494 if (td->td_md.md_spinlock_count == 0) { 495 intr_restore(msr); 496 __asm __volatile("or 6,6,6"); /* Set normal thread priority */ 497 } 498 } 499 500 /* 501 * Simple ddb(4) command/hack to view any SPR on the running CPU. 502 * Uses a trivial asm function to perform the mfspr, and rewrites the mfspr 503 * instruction each time. 504 * XXX: Since it uses code modification, it won't work if the kernel code pages 505 * are marked RO. 506 */ 507 extern register_t get_spr(int); 508 509 #ifdef DDB 510 DB_SHOW_COMMAND(spr, db_show_spr) 511 { 512 register_t spr; 513 volatile uint32_t *p; 514 int sprno, saved_sprno; 515 516 if (!have_addr) 517 return; 518 519 saved_sprno = sprno = (intptr_t) addr; 520 sprno = ((sprno & 0x3e0) >> 5) | ((sprno & 0x1f) << 5); 521 p = (uint32_t *)(void *)&get_spr; 522 *p = (*p & ~0x001ff800) | (sprno << 11); 523 __syncicache(get_spr, cacheline_size); 524 spr = get_spr(sprno); 525 526 db_printf("SPR %d(%x): %lx\n", saved_sprno, saved_sprno, 527 (unsigned long)spr); 528 } 529 #endif 530 531 #undef bzero 532 void 533 bzero(void *buf, size_t len) 534 { 535 caddr_t p; 536 537 p = buf; 538 539 while (((vm_offset_t) p & (sizeof(u_long) - 1)) && len) { 540 *p++ = 0; 541 len--; 542 } 543 544 while (len >= sizeof(u_long) * 8) { 545 *(u_long*) p = 0; 546 *((u_long*) p + 1) = 0; 547 *((u_long*) p + 2) = 0; 548 *((u_long*) p + 3) = 0; 549 len -= sizeof(u_long) * 8; 550 *((u_long*) p + 4) = 0; 551 *((u_long*) p + 5) = 0; 552 *((u_long*) p + 6) = 0; 553 *((u_long*) p + 7) = 0; 554 p += sizeof(u_long) * 8; 555 } 556 557 while (len >= sizeof(u_long)) { 558 *(u_long*) p = 0; 559 len -= sizeof(u_long); 560 p += sizeof(u_long); 561 } 562 563 while (len) { 564 *p++ = 0; 565 len--; 566 } 567 } 568