fdt_machdep.c revision 1.110
1 /* $NetBSD: fdt_machdep.c,v 1.110 2025/09/06 21:02:41 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2015-2017 Jared McNeill <jmcneill (at) invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: fdt_machdep.c,v 1.110 2025/09/06 21:02:41 thorpej Exp $"); 31 32 #include "opt_arm_debug.h" 33 #include "opt_bootconfig.h" 34 #include "opt_cpuoptions.h" 35 #include "opt_ddb.h" 36 #include "opt_efi.h" 37 #include "opt_machdep.h" 38 #include "opt_multiprocessor.h" 39 40 #include "genfb.h" 41 #include "pci.h" 42 #include "ukbd.h" 43 #include "wsdisplay.h" 44 45 #include <sys/param.h> 46 #include <sys/types.h> 47 48 #include <sys/atomic.h> 49 #include <sys/bootblock.h> 50 #include <sys/bus.h> 51 #include <sys/conf.h> 52 #include <sys/cpu.h> 53 #include <sys/device.h> 54 #include <sys/disk.h> 55 #include <sys/disklabel.h> 56 #include <sys/endian.h> 57 #include <sys/exec.h> 58 #include <sys/fcntl.h> 59 #include <sys/kauth.h> 60 #include <sys/kernel.h> 61 #include <sys/kmem.h> 62 #include <sys/ksyms.h> 63 #include <sys/md5.h> 64 #include <sys/msgbuf.h> 65 #include <sys/proc.h> 66 #include <sys/pserialize.h> 67 #include <sys/reboot.h> 68 #include <sys/systm.h> 69 #include <sys/termios.h> 70 #include <sys/vnode.h> 71 #include <sys/uuid.h> 72 73 #include <net/if.h> 74 #include <net/if_dl.h> 75 76 #include <dev/cons.h> 77 #include <uvm/uvm_extern.h> 78 79 #include <machine/db_machdep.h> 80 #include <ddb/db_sym.h> 81 #include <ddb/db_extern.h> 82 83 #include <machine/bootconfig.h> 84 #include <arm/armreg.h> 85 86 #include <arm/cpufunc.h> 87 88 #include <evbarm/include/autoconf.h> 89 #include <evbarm/fdt/machdep.h> 90 #include <evbarm/fdt/platform.h> 91 92 #include <arm/fdt/arm_fdtvar.h> 93 94 #include <dev/fdt/fdtvar.h> 95 #include <dev/fdt/fdt_boot.h> 96 #include <dev/fdt/fdt_private.h> 97 #include <dev/fdt/fdt_memory.h> 98 #include <dev/fdt/fdt_platform.h> 99 100 #ifdef EFI_RUNTIME 101 #include <arm/arm/efi_runtime.h> 102 #endif 103 104 #if NWSDISPLAY > 0 && NGENFB > 0 105 #include <arm/fdt/arm_simplefb.h> 106 #endif 107 108 #if NUKBD > 0 109 #include <dev/usb/ukbdvar.h> 110 #endif 111 #if NWSDISPLAY > 0 112 #include <dev/wscons/wsdisplayvar.h> 113 #endif 114 115 #if NPCI > 0 116 #include <dev/pci/pcireg.h> 117 #include <dev/pci/pcivar.h> 118 #endif 119 120 BootConfig bootconfig; 121 char *boot_args = NULL; 122 123 /* filled in before cleaning bss. keep in .data */ 124 u_long uboot_args[4] __attribute__((__section__(".data"))); 125 const uint8_t *fdt_addr_r __attribute__((__section__(".data"))); 126 127 #include <libfdt.h> 128 #include <dev/fdt/fdtvar.h> 129 #define FDT_BUF_SIZE (512*1024) 130 static uint8_t fdt_data[FDT_BUF_SIZE]; 131 132 extern char KERNEL_BASE_phys[]; 133 #define KERNEL_BASE_PHYS ((paddr_t)KERNEL_BASE_phys) 134 135 static void fdt_device_register(device_t, void *); 136 static void fdt_device_register_post_config(device_t, void *); 137 static void fdt_reset(void); 138 static void fdt_powerdown(void); 139 140 #if BYTE_ORDER == BIG_ENDIAN 141 static void fdt_update_fb_format(void); 142 #endif 143 144 static void 145 earlyconsputc(dev_t dev, int c) 146 { 147 uartputc(c); 148 } 149 150 static int 151 earlyconsgetc(dev_t dev) 152 { 153 return -1; 154 } 155 156 static struct consdev earlycons = { 157 .cn_putc = earlyconsputc, 158 .cn_getc = earlyconsgetc, 159 .cn_pollc = nullcnpollc, 160 }; 161 162 #ifdef VERBOSE_INIT_ARM 163 #define VPRINTF(...) printf(__VA_ARGS__) 164 #else 165 #define VPRINTF(...) __nothing 166 #endif 167 168 static void 169 fdt_add_dram_blocks(const struct fdt_memory *m, void *arg) 170 { 171 BootConfig *bc = arg; 172 173 VPRINTF(" %" PRIx64 " - %" PRIx64 "\n", m->start, m->end - 1); 174 bc->dram[bc->dramblocks].address = m->start; 175 bc->dram[bc->dramblocks].pages = 176 (m->end - m->start) / PAGE_SIZE; 177 bc->dramblocks++; 178 } 179 180 static int nfdt_physmem = 0; 181 static struct boot_physmem fdt_physmem[FDT_MEMORY_RANGES]; 182 183 static void 184 fdt_add_boot_physmem(const struct fdt_memory *m, void *arg) 185 { 186 const paddr_t saddr = round_page(m->start); 187 const paddr_t eaddr = trunc_page(m->end); 188 189 VPRINTF(" %" PRIx64 " - %" PRIx64, m->start, m->end - 1); 190 if (saddr >= eaddr) { 191 VPRINTF(" skipped\n"); 192 return; 193 } 194 VPRINTF("\n"); 195 196 struct boot_physmem *bp = &fdt_physmem[nfdt_physmem++]; 197 198 KASSERT(nfdt_physmem <= FDT_MEMORY_RANGES); 199 200 bp->bp_start = atop(saddr); 201 bp->bp_pages = atop(eaddr) - bp->bp_start; 202 bp->bp_freelist = VM_FREELIST_DEFAULT; 203 204 #ifdef PMAP_NEED_ALLOC_POOLPAGE 205 const uint64_t memory_size = *(uint64_t *)arg; 206 if (atop(memory_size) > bp->bp_pages) { 207 arm_poolpage_vmfreelist = VM_FREELIST_DIRECTMAP; 208 bp->bp_freelist = VM_FREELIST_DIRECTMAP; 209 } 210 #endif 211 } 212 213 214 static void 215 fdt_print_memory(const struct fdt_memory *m, void *arg) 216 { 217 218 VPRINTF("FDT /memory @ 0x%" PRIx64 " size 0x%" PRIx64 "\n", 219 m->start, m->end - m->start); 220 } 221 222 223 /* 224 * Define usable memory regions. 225 */ 226 static void 227 fdt_build_bootconfig(uint64_t mem_start, uint64_t mem_end) 228 { 229 BootConfig *bc = &bootconfig; 230 231 uint64_t addr, size; 232 int index; 233 234 /* Reserve pages for ramdisk, rndseed, and firmware's RNG */ 235 fdt_reserve_initrd(); 236 fdt_reserve_rndseed(); 237 fdt_reserve_efirng(); 238 239 const int framebuffer = OF_finddevice("/chosen/framebuffer"); 240 if (framebuffer >= 0) { 241 for (index = 0; 242 fdtbus_get_reg64(framebuffer, index, &addr, &size) == 0; 243 index++) { 244 fdt_memory_remove_range(addr, size); 245 } 246 } 247 248 VPRINTF("Usable memory:\n"); 249 bc->dramblocks = 0; 250 fdt_memory_foreach(fdt_add_dram_blocks, bc); 251 } 252 253 254 vaddr_t 255 initarm(void *arg) 256 { 257 const struct fdt_platform *plat; 258 uint64_t memory_start, memory_end; 259 260 /* set temporally to work printf()/panic() even before consinit() */ 261 cn_tab = &earlycons; 262 263 /* Load FDT */ 264 int error = fdt_check_header(fdt_addr_r); 265 if (error != 0) 266 panic("fdt_check_header failed: %s", fdt_strerror(error)); 267 268 /* If the DTB is too big, try to pack it in place first. */ 269 if (fdt_totalsize(fdt_addr_r) > sizeof(fdt_data)) 270 (void)fdt_pack(__UNCONST(fdt_addr_r)); 271 272 error = fdt_open_into(fdt_addr_r, fdt_data, sizeof(fdt_data)); 273 if (error != 0) 274 panic("fdt_move failed: %s", fdt_strerror(error)); 275 276 fdtbus_init(fdt_data); 277 278 /* Lookup platform specific backend */ 279 plat = fdt_platform_find(); 280 if (plat == NULL) 281 panic("Kernel does not support this device"); 282 283 /* Early console may be available, announce ourselves. */ 284 VPRINTF("FDT<%p>\n", fdt_addr_r); 285 286 boot_args = fdt_get_bootargs(); 287 288 /* Heads up ... Setup the CPU / MMU / TLB functions. */ 289 VPRINTF("cpufunc\n"); 290 if (set_cpufuncs()) 291 panic("cpu not recognized!"); 292 293 /* 294 * Memory is still identity/flat mapped this point so using ttbr for 295 * l1pt VA is fine 296 */ 297 298 VPRINTF("devmap %p\n", plat->fp_devmap()); 299 extern char ARM_BOOTSTRAP_LxPT[]; 300 pmap_devmap_bootstrap((vaddr_t)ARM_BOOTSTRAP_LxPT, plat->fp_devmap()); 301 302 VPRINTF("bootstrap\n"); 303 plat->fp_bootstrap(); 304 305 /* 306 * If stdout-path is specified on the command line, override the 307 * value in /chosen/stdout-path before initializing console. 308 */ 309 VPRINTF("stdout\n"); 310 fdt_update_stdout_path(fdt_data, boot_args); 311 312 #if BYTE_ORDER == BIG_ENDIAN 313 /* 314 * Most boards are configured to little-endian mode initially, and 315 * switched to big-endian mode after kernel is loaded. In this case, 316 * framebuffer seems byte-swapped to CPU. Override FDT to let 317 * drivers know. 318 */ 319 VPRINTF("fb_format\n"); 320 fdt_update_fb_format(); 321 #endif 322 323 /* 324 * Done making changes to the FDT. 325 */ 326 fdt_pack(fdt_data); 327 328 VPRINTF("consinit "); 329 consinit(); 330 VPRINTF("ok\n"); 331 332 VPRINTF("uboot: args %#lx, %#lx, %#lx, %#lx\n", 333 uboot_args[0], uboot_args[1], uboot_args[2], uboot_args[3]); 334 335 cpu_reset_address = fdt_reset; 336 cpu_powerdown_address = fdt_powerdown; 337 evbarm_device_register = fdt_device_register; 338 evbarm_device_register_post_config = fdt_device_register_post_config; 339 evbarm_cpu_rootconf = fdt_cpu_rootconf; 340 341 /* Talk to the user */ 342 printf("NetBSD/evbarm (fdt) booting ...\n"); 343 344 #ifdef BOOT_ARGS 345 char mi_bootargs[] = BOOT_ARGS; 346 parse_mi_bootargs(mi_bootargs); 347 #endif 348 349 fdt_memory_get(&memory_start, &memory_end); 350 351 fdt_memory_foreach(fdt_print_memory, NULL); 352 353 #if !defined(_LP64) 354 /* Cannot map memory above 4GB (remove last page as well) */ 355 const uint64_t memory_limit = 0x100000000ULL - PAGE_SIZE; 356 if (memory_end > memory_limit) { 357 fdt_memory_remove_range(memory_limit , memory_end); 358 memory_end = memory_limit; 359 } 360 #endif 361 uint64_t memory_size = memory_end - memory_start; 362 363 VPRINTF("%s: memory start %" PRIx64 " end %" PRIx64 " (len %" 364 PRIx64 ")\n", __func__, memory_start, memory_end, memory_size); 365 366 /* Parse ramdisk info */ 367 fdt_probe_initrd(); 368 369 /* Parse our on-disk rndseed and the firmware's RNG from EFI */ 370 fdt_probe_rndseed(); 371 fdt_probe_efirng(); 372 373 fdt_memory_remove_reserved(memory_start, memory_end); 374 375 /* 376 * Populate bootconfig structure for the benefit of dodumpsys 377 */ 378 VPRINTF("%s: fdt_build_bootconfig\n", __func__); 379 fdt_build_bootconfig(memory_start, memory_end); 380 381 /* Perform PT build and VM init */ 382 cpu_kernel_vm_init(memory_start, memory_size); 383 384 VPRINTF("bootargs: %s\n", boot_args); 385 386 parse_mi_bootargs(boot_args); 387 388 VPRINTF("Memory regions:\n"); 389 390 /* Populate fdt_physmem / nfdt_physmem for initarm_common */ 391 fdt_memory_foreach(fdt_add_boot_physmem, &memory_size); 392 393 vaddr_t sp = initarm_common(KERNEL_VM_BASE, KERNEL_VM_SIZE, fdt_physmem, 394 nfdt_physmem); 395 396 /* 397 * initarm_common flushes cache if required before AP start 398 */ 399 error = 0; 400 if ((boothowto & RB_MD1) == 0) { 401 VPRINTF("mpstart\n"); 402 if (plat->fp_mpstart) 403 error = plat->fp_mpstart(); 404 } 405 406 if (error) 407 return sp; 408 409 /* 410 * Now we have APs started the pages used for stacks and L1PT can 411 * be given to uvm 412 */ 413 extern char const __start__init_memory[]; 414 extern char const __stop__init_memory[] __weak; 415 416 if (&__start__init_memory[0] != &__stop__init_memory[0]) { 417 const paddr_t spa = KERN_VTOPHYS((vaddr_t)__start__init_memory); 418 const paddr_t epa = KERN_VTOPHYS((vaddr_t)__stop__init_memory); 419 const paddr_t spg = atop(spa); 420 const paddr_t epg = atop(epa); 421 422 VPRINTF(" start %08lx end %08lx... " 423 "loading in freelist %d\n", spa, epa, VM_FREELIST_DEFAULT); 424 425 uvm_page_physload(spg, epg, spg, epg, VM_FREELIST_DEFAULT); 426 } 427 428 return sp; 429 } 430 431 void 432 consinit(void) 433 { 434 static bool initialized = false; 435 const struct fdt_platform *plat = fdt_platform_find(); 436 const struct fdt_console *cons = fdtbus_get_console(); 437 struct fdt_attach_args faa; 438 u_int uart_freq = 0; 439 440 if (initialized || cons == NULL) 441 return; 442 443 plat->fp_init_attach_args(&faa); 444 faa.faa_phandle = fdtbus_get_stdout_phandle(); 445 446 if (plat->fp_uart_freq != NULL) 447 uart_freq = plat->fp_uart_freq(); 448 449 cons->consinit(&faa, uart_freq); 450 451 initialized = true; 452 } 453 454 void 455 cpu_startup_hook(void) 456 { 457 #ifdef EFI_RUNTIME 458 fdt_map_efi_runtime("netbsd,uefi-runtime-code", ARM_EFIRT_MEM_CODE); 459 fdt_map_efi_runtime("netbsd,uefi-runtime-data", ARM_EFIRT_MEM_DATA); 460 fdt_map_efi_runtime("netbsd,uefi-runtime-mmio", ARM_EFIRT_MEM_MMIO); 461 #endif 462 463 fdtbus_intr_init(); 464 465 fdt_setup_rndseed(); 466 fdt_setup_efirng(); 467 } 468 469 void 470 delay(u_int us) 471 { 472 const struct fdt_platform *plat = fdt_platform_find(); 473 474 plat->fp_delay(us); 475 } 476 static void 477 fdt_device_register(device_t self, void *aux) 478 { 479 const struct fdt_platform *plat = fdt_platform_find(); 480 481 if (device_is_a(self, "armfdt")) { 482 fdt_setup_initrd(); 483 484 #if NWSDISPLAY > 0 && NGENFB > 0 485 /* 486 * Setup framebuffer console, if present. 487 */ 488 arm_simplefb_preattach(); 489 #endif 490 } 491 492 #if NWSDISPLAY > 0 && NGENFB > 0 493 if (device_is_a(self, "genfb")) { 494 prop_dictionary_t dict = device_properties(self); 495 prop_dictionary_set_uint64(dict, 496 "simplefb-physaddr", arm_simplefb_physaddr()); 497 } 498 499 #if NPCI > 0 500 /* 501 * Gross hack to allow handoff of console from genfb to a PCI DRM 502 * display driver. Will match the first device that attaches, which 503 * is not ideal, but better than nothing for now. Similar to how 504 * this is handled on x86. 505 */ 506 if (device_parent(self) != NULL && 507 device_is_a(device_parent(self), "pci")) { 508 static bool found_pci_console = false; 509 struct pci_attach_args *pa = aux; 510 511 if (PCI_CLASS(pa->pa_class) == PCI_CLASS_DISPLAY && 512 !found_pci_console) { 513 prop_dictionary_t dict = device_properties(self); 514 prop_dictionary_set_bool(dict, "is_console", true); 515 found_pci_console = true; 516 } 517 } 518 #endif 519 #endif 520 521 if (plat && plat->fp_device_register) 522 plat->fp_device_register(self, aux); 523 } 524 525 static void 526 fdt_device_register_post_config(device_t self, void *aux) 527 { 528 const struct fdt_platform *plat = fdt_platform_find(); 529 530 if (plat && plat->fp_device_register_post_config) 531 plat->fp_device_register_post_config(self, aux); 532 533 #if NUKBD > 0 && NWSDISPLAY > 0 534 if (device_is_a(self, "wsdisplay")) { 535 struct wsdisplay_softc *sc = device_private(self); 536 if (wsdisplay_isconsole(sc)) 537 ukbd_cnattach(); 538 } 539 #endif 540 } 541 542 static void 543 fdt_reset(void) 544 { 545 const struct fdt_platform *plat = fdt_platform_find(); 546 547 fdtbus_power_reset(); 548 549 if (plat && plat->fp_reset) 550 plat->fp_reset(); 551 } 552 553 static void 554 fdt_powerdown(void) 555 { 556 fdtbus_power_poweroff(); 557 } 558 559 #if BYTE_ORDER == BIG_ENDIAN 560 static void 561 fdt_update_fb_format(void) 562 { 563 int off, len; 564 const char *format, *replace; 565 566 off = fdt_path_offset(fdt_data, "/chosen"); 567 if (off < 0) 568 return; 569 570 for (;;) { 571 off = fdt_node_offset_by_compatible(fdt_data, off, 572 "simple-framebuffer"); 573 if (off < 0) 574 return; 575 576 format = fdt_getprop(fdt_data, off, "format", &len); 577 if (format == NULL) 578 continue; 579 580 replace = NULL; 581 if (strcmp(format, "a8b8g8r8") == 0) 582 replace = "r8g8b8a8"; 583 else if (strcmp(format, "x8r8g8b8") == 0) 584 replace = "b8g8r8x8"; 585 if (replace != NULL) 586 fdt_setprop(fdt_data, off, "format", replace, 587 strlen(replace) + 1); 588 } 589 } 590 #endif 591
Indexes created Tue Sep 30 17:09:57 GMT 2025