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