riscv_machdep.c revision 1.26
1 /* $NetBSD: riscv_machdep.c,v 1.26 2023/05/07 12:41:49 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2014, 2019, 2022 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas of 3am Software Foundry, and by Nick Hudson. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include "opt_ddb.h" 33 #include "opt_modular.h" 34 #include "opt_riscv_debug.h" 35 36 #include <sys/cdefs.h> 37 __RCSID("$NetBSD: riscv_machdep.c,v 1.26 2023/05/07 12:41:49 skrll Exp $"); 38 39 #include <sys/param.h> 40 41 #include <sys/asan.h> 42 #include <sys/boot_flag.h> 43 #include <sys/cpu.h> 44 #include <sys/exec.h> 45 #include <sys/kmem.h> 46 #include <sys/ktrace.h> 47 #include <sys/lwp.h> 48 #include <sys/module.h> 49 #include <sys/mount.h> 50 #include <sys/msgbuf.h> 51 #include <sys/optstr.h> 52 #include <sys/proc.h> 53 #include <sys/reboot.h> 54 #include <sys/syscall.h> 55 #include <sys/sysctl.h> 56 #include <sys/systm.h> 57 58 #include <dev/cons.h> 59 #include <uvm/uvm_extern.h> 60 61 #include <riscv/frame.h> 62 #include <riscv/locore.h> 63 #include <riscv/machdep.h> 64 #include <riscv/pte.h> 65 #include <riscv/sbi.h> 66 67 #include <libfdt.h> 68 #include <dev/fdt/fdtvar.h> 69 #include <dev/fdt/fdt_boot.h> 70 #include <dev/fdt/fdt_memory.h> 71 #include <dev/fdt/fdt_private.h> 72 73 int cpu_printfataltraps = 1; 74 char machine[] = MACHINE; 75 char machine_arch[] = MACHINE_ARCH; 76 77 #ifdef VERBOSE_INIT_RISCV 78 #define VPRINTF(...) printf(__VA_ARGS__) 79 #else 80 #define VPRINTF(...) __nothing 81 #endif 82 83 #ifndef FDT_MAX_BOOT_STRING 84 #define FDT_MAX_BOOT_STRING 1024 85 #endif 86 /* 64 should be enough, even for a ZFS UUID */ 87 #define MAX_BOOT_DEV_STR 64 88 89 char bootargs[FDT_MAX_BOOT_STRING] = ""; 90 char bootdevstr[MAX_BOOT_DEV_STR] = ""; 91 char *boot_args = NULL; 92 93 paddr_t physical_start; 94 paddr_t physical_end; 95 96 static void 97 earlyconsputc(dev_t dev, int c) 98 { 99 uartputc(c); 100 } 101 102 static int 103 earlyconsgetc(dev_t dev) 104 { 105 return uartgetc(); 106 } 107 108 static struct consdev earlycons = { 109 .cn_putc = earlyconsputc, 110 .cn_getc = earlyconsgetc, 111 .cn_pollc = nullcnpollc, 112 }; 113 114 struct vm_map *phys_map; 115 116 struct trapframe cpu_ddb_regs; 117 const pcu_ops_t * const pcu_ops_md_defs[PCU_UNIT_COUNT] = { 118 #ifdef FPE 119 [PCU_FPU] = &pcu_fpu_ops, 120 #endif 121 }; 122 123 /* 124 * Used by PHYSTOV and VTOPHYS -- Will be set be BSS is zeroed so 125 * keep it in data 126 */ 127 unsigned long kern_vtopdiff __attribute__((__section__(".data"))); 128 129 130 /* 131 * machine dependent system variables. 132 */ 133 SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup") 134 { 135 sysctl_createv(clog, 0, NULL, NULL, 136 CTLFLAG_PERMANENT, 137 CTLTYPE_NODE, "machdep", NULL, 138 NULL, 0, NULL, 0, 139 CTL_MACHDEP, CTL_EOL); 140 } 141 142 void 143 delay(unsigned long us) 144 { 145 const uint32_t cycles_per_us = curcpu()->ci_data.cpu_cc_freq / 1000000; 146 const uint64_t cycles = (uint64_t)us * cycles_per_us; 147 const uint64_t finish = csr_cycle_read() + cycles; 148 149 while (csr_cycle_read() < finish) { 150 /* spin, baby spin */ 151 } 152 } 153 154 #ifdef MODULAR 155 /* 156 * Push any modules loaded by the boot loader. 157 */ 158 void 159 module_init_md(void) 160 { 161 } 162 #endif /* MODULAR */ 163 164 /* 165 * Set registers on exec. 166 * Clear all registers except sp, pc. 167 * sp is set to the stack pointer passed in. pc is set to the entry 168 * point given by the exec_package passed in. 169 */ 170 void 171 setregs(struct lwp *l, struct exec_package *pack, vaddr_t stack) 172 { 173 struct trapframe * const tf = l->l_md.md_utf; 174 struct proc * const p = l->l_proc; 175 176 memset(tf, 0, sizeof(*tf)); 177 tf->tf_sp = (intptr_t)stack_align(stack); 178 tf->tf_pc = (intptr_t)pack->ep_entry & ~1; 179 #ifdef _LP64 180 tf->tf_sr = (p->p_flag & PK_32) ? SR_USER32 : SR_USER64; 181 #else 182 tf->tf_sr = SR_USER; 183 #endif 184 185 // Set up arguments for ___start(cleanup, ps_strings) 186 tf->tf_a0 = 0; // cleanup 187 tf->tf_a1 = p->p_psstrp; // ps_strings 188 189 /* 190 * Must have interrupts disabled for exception return. 191 * Must be switching to user mode. 192 * Must enable interrupts after sret. 193 */ 194 KASSERT(__SHIFTOUT(tf->tf_sr, SR_SIE) == 0); 195 KASSERT(__SHIFTOUT(tf->tf_sr, SR_SPP) == 0); 196 KASSERT(__SHIFTOUT(tf->tf_sr, SR_SPIE) != 0); 197 } 198 199 void 200 md_child_return(struct lwp *l) 201 { 202 struct trapframe * const tf = lwp_trapframe(l); 203 204 tf->tf_a0 = 0; 205 tf->tf_a1 = 1; 206 #ifdef FPE 207 /* Disable FP as we can't be using it (yet). */ 208 tf->tf_sr &= ~SR_FS; 209 #endif 210 211 /* 212 * Must have interrupts disabled for exception return. 213 * Must be switching to user mode. 214 * Must enable interrupts after sret. 215 */ 216 217 KASSERT(__SHIFTOUT(tf->tf_sr, SR_SIE) == 0); 218 KASSERT(__SHIFTOUT(tf->tf_sr, SR_SPP) == 0); 219 KASSERT(__SHIFTOUT(tf->tf_sr, SR_SPIE) != 0); 220 221 userret(l); 222 } 223 224 void 225 cpu_spawn_return(struct lwp *l) 226 { 227 userret(l); 228 } 229 230 /* 231 * Start a new LWP 232 */ 233 void 234 startlwp(void *arg) 235 { 236 ucontext_t * const uc = arg; 237 lwp_t * const l = curlwp; 238 int error __diagused; 239 240 error = cpu_setmcontext(l, &uc->uc_mcontext, uc->uc_flags); 241 KASSERT(error == 0); 242 243 kmem_free(uc, sizeof(*uc)); 244 userret(l); 245 } 246 247 // We've worked hard to make sure struct reg and __gregset_t are the same. 248 // Ditto for struct fpreg and fregset_t. 249 250 #ifdef _LP64 251 CTASSERT(sizeof(struct reg) == sizeof(__gregset_t)); 252 #endif 253 CTASSERT(sizeof(struct fpreg) == sizeof(__fregset_t)); 254 255 void 256 cpu_getmcontext(struct lwp *l, mcontext_t *mcp, unsigned int *flags) 257 { 258 const struct trapframe * const tf = l->l_md.md_utf; 259 260 /* Save register context. */ 261 *(struct reg *)mcp->__gregs = tf->tf_regs; 262 263 *flags |= _UC_CPU | _UC_TLSBASE; 264 265 /* Save floating point register context, if any. */ 266 KASSERT(l == curlwp); 267 if (fpu_valid_p(l)) { 268 /* 269 * If this process is the current FP owner, dump its 270 * context to the PCB first. 271 */ 272 fpu_save(l); 273 274 struct pcb * const pcb = lwp_getpcb(l); 275 *(struct fpreg *)mcp->__fregs = pcb->pcb_fpregs; 276 *flags |= _UC_FPU; 277 } 278 } 279 280 int 281 cpu_mcontext_validate(struct lwp *l, const mcontext_t *mcp) 282 { 283 /* 284 * Verify that at least the PC and SP are user addresses. 285 */ 286 if ((intptr_t) mcp->__gregs[_REG_PC] < 0 287 || (intptr_t) mcp->__gregs[_REG_SP] < 0 288 || (mcp->__gregs[_REG_PC] & 1)) 289 return EINVAL; 290 291 return 0; 292 } 293 294 int 295 cpu_setmcontext(struct lwp *l, const mcontext_t *mcp, unsigned int flags) 296 { 297 struct trapframe * const tf = l->l_md.md_utf; 298 struct proc * const p = l->l_proc; 299 const __greg_t * const gr = mcp->__gregs; 300 int error; 301 302 /* Restore register context, if any. */ 303 if (flags & _UC_CPU) { 304 error = cpu_mcontext_validate(l, mcp); 305 if (error) 306 return error; 307 308 /* Save register context. */ 309 tf->tf_regs = *(const struct reg *)gr; 310 } 311 312 /* Restore the private thread context */ 313 if (flags & _UC_TLSBASE) { 314 lwp_setprivate(l, (void *)(intptr_t)mcp->__gregs[_X_TP]); 315 } 316 317 /* Restore floating point register context, if any. */ 318 if (flags & _UC_FPU) { 319 KASSERT(l == curlwp); 320 /* Tell PCU we are replacing the FPU contents. */ 321 fpu_replace(l); 322 323 /* 324 * The PCB FP regs struct includes the FP CSR, so use the 325 * proper size of fpreg when copying. 326 */ 327 struct pcb * const pcb = lwp_getpcb(l); 328 pcb->pcb_fpregs = *(const struct fpreg *)mcp->__fregs; 329 } 330 331 mutex_enter(p->p_lock); 332 if (flags & _UC_SETSTACK) 333 l->l_sigstk.ss_flags |= SS_ONSTACK; 334 if (flags & _UC_CLRSTACK) 335 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 336 mutex_exit(p->p_lock); 337 338 return 0; 339 } 340 341 void 342 cpu_need_resched(struct cpu_info *ci, struct lwp *l, int flags) 343 { 344 KASSERT(kpreempt_disabled()); 345 346 if ((flags & RESCHED_KPREEMPT) != 0) { 347 #ifdef __HAVE_PREEMPTION 348 if ((flags & RESCHED_REMOTE) != 0) { 349 cpu_send_ipi(ci, IPI_KPREEMPT); 350 } else { 351 softint_trigger(SOFTINT_KPREEMPT); 352 } 353 #endif 354 return; 355 } 356 if ((flags & RESCHED_REMOTE) != 0) { 357 #ifdef MULTIPROCESSOR 358 cpu_send_ipi(ci, IPI_AST); 359 #endif 360 } else { 361 l->l_md.md_astpending = 1; /* force call to ast() */ 362 } 363 } 364 365 void 366 cpu_signotify(struct lwp *l) 367 { 368 KASSERT(kpreempt_disabled()); 369 #ifdef __HAVE_FAST_SOFTINTS 370 KASSERT(lwp_locked(l, NULL)); 371 #endif 372 373 if (l->l_cpu != curcpu()) { 374 #ifdef MULTIPROCESSOR 375 cpu_send_ipi(ci, IPI_AST); 376 #endif 377 } else { 378 l->l_md.md_astpending = 1; /* force call to ast() */ 379 } 380 } 381 382 383 void 384 cpu_need_proftick(struct lwp *l) 385 { 386 KASSERT(kpreempt_disabled()); 387 KASSERT(l->l_cpu == curcpu()); 388 389 l->l_pflag |= LP_OWEUPC; 390 l->l_md.md_astpending = 1; /* force call to ast() */ 391 } 392 393 394 /* Sync the discs, unmount the filesystems, and adjust the todr */ 395 static void 396 bootsync(void) 397 { 398 static bool bootsyncdone = false; 399 400 if (bootsyncdone) 401 return; 402 403 bootsyncdone = true; 404 405 /* Make sure we can still manage to do things */ 406 if ((csr_sstatus_read() & SR_SIE) == 0) { 407 /* 408 * If we get here then boot has been called without RB_NOSYNC 409 * and interrupts were disabled. This means the boot() call 410 * did not come from a user process e.g. shutdown, but must 411 * have come from somewhere in the kernel. 412 */ 413 ENABLE_INTERRUPTS(); 414 printf("Warning interrupts disabled during boot()\n"); 415 } 416 417 vfs_shutdown(); 418 419 resettodr(); 420 } 421 422 423 void 424 cpu_reboot(int howto, char *bootstr) 425 { 426 427 /* 428 * If RB_NOSYNC was not specified sync the discs. 429 * Note: Unless cold is set to 1 here, syslogd will die during the 430 * unmount. It looks like syslogd is getting woken up only to find 431 * that it cannot page part of the binary in as the filesystem has 432 * been unmounted. 433 */ 434 if ((howto & RB_NOSYNC) == 0) 435 bootsync(); 436 437 #if 0 438 /* Disable interrupts. */ 439 const int s = splhigh(); 440 441 /* Do a dump if requested. */ 442 if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP) 443 dumpsys(); 444 445 splx(s); 446 #endif 447 448 pmf_system_shutdown(boothowto); 449 450 /* Say NO to interrupts for good */ 451 splhigh(); 452 453 /* Run any shutdown hooks */ 454 doshutdownhooks(); 455 456 /* Make sure IRQ's are disabled */ 457 DISABLE_INTERRUPTS(); 458 459 sbi_system_reset(SBI_RESET_TYPE_COLDREBOOT, SBI_RESET_REASON_NONE); 460 461 for (;;) { 462 asm volatile("wfi" ::: "memory"); 463 } 464 /* NOTREACHED */ 465 } 466 467 void 468 cpu_dumpconf(void) 469 { 470 // TBD!! 471 } 472 473 474 int 475 cpu_lwp_setprivate(lwp_t *l, void *addr) 476 { 477 struct trapframe * const tf = lwp_trapframe(l); 478 479 tf->tf_reg[_REG_TP] = (register_t)addr; 480 481 return 0; 482 } 483 484 485 void 486 cpu_startup(void) 487 { 488 vaddr_t minaddr, maxaddr; 489 char pbuf[10]; /* "999999 MB" -- But Sv39 is max 512GB */ 490 491 /* 492 * Good {morning,afternoon,evening,night}. 493 */ 494 printf("%s%s", copyright, version); 495 format_bytes(pbuf, sizeof(pbuf), ctob(physmem)); 496 printf("total memory = %s\n", pbuf); 497 498 minaddr = 0; 499 /* 500 * Allocate a submap for physio. 501 */ 502 phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 503 VM_PHYS_SIZE, 0, FALSE, NULL); 504 505 format_bytes(pbuf, sizeof(pbuf), ptoa(uvm_availmem(false))); 506 printf("avail memory = %s\n", pbuf); 507 508 fdtbus_intr_init(); 509 } 510 511 static void 512 riscv_add_memory(const struct fdt_memory *m, void *arg) 513 { 514 paddr_t first = atop(m->start); 515 paddr_t last = atop(m->end); 516 int freelist = VM_FREELIST_DEFAULT; 517 518 VPRINTF("adding %#16" PRIxPADDR " - %#16" PRIxPADDR" to freelist %d\n", 519 m->start, m->end, freelist); 520 521 uvm_page_physload(first, last, first, last, freelist); 522 physmem += last - first; 523 } 524 525 526 static void 527 cpu_kernel_vm_init(paddr_t memory_start, paddr_t memory_end) 528 { 529 extern char __kernel_text[]; 530 extern char _end[]; 531 532 vaddr_t kernstart = trunc_page((vaddr_t)__kernel_text); 533 vaddr_t kernend = round_page((vaddr_t)_end); 534 paddr_t kernstart_phys = KERN_VTOPHYS(kernstart); 535 paddr_t kernend_phys = KERN_VTOPHYS(kernend); 536 537 VPRINTF("%s: kernel phys start %#" PRIxPADDR " end %#" PRIxPADDR "\n", 538 __func__, kernstart_phys, kernend_phys); 539 fdt_memory_remove_range(kernstart_phys, 540 kernend_phys - kernstart_phys); 541 542 /* 543 * Don't give these pages to UVM. 544 * 545 * cpu_kernel_vm_init need to create proper tables then the following 546 * will be true. 547 * 548 * Now we have APs started the pages used for stacks and L1PT can 549 * be given to uvm 550 */ 551 extern char const __start__init_memory[]; 552 extern char const __stop__init_memory[] __weak; 553 if (__start__init_memory != __stop__init_memory) { 554 const paddr_t spa = KERN_VTOPHYS((vaddr_t)__start__init_memory); 555 const paddr_t epa = KERN_VTOPHYS((vaddr_t)__stop__init_memory); 556 557 VPRINTF("%s: init phys start %#" PRIxPADDR 558 " end %#" PRIxPADDR "\n", __func__, spa, epa); 559 fdt_memory_remove_range(spa, epa - spa); 560 } 561 562 #ifdef _LP64 563 paddr_t pa = memory_start & ~XSEGOFSET; 564 pmap_direct_base = RISCV_DIRECTMAP_START; 565 extern pd_entry_t l2_pte[PAGE_SIZE / sizeof(pd_entry_t)]; 566 567 568 const vsize_t vshift = XSEGSHIFT; 569 const vaddr_t pdetab_mask = PMAP_PDETABSIZE - 1; 570 const vsize_t inc = 1UL << vshift; 571 572 const vaddr_t sva = RISCV_DIRECTMAP_START + pa; 573 const vaddr_t eva = RISCV_DIRECTMAP_END; 574 const size_t sidx = (sva >> vshift) & pdetab_mask; 575 const size_t eidx = (eva >> vshift) & pdetab_mask; 576 577 /* Allocate gigapages covering all physical memory in the direct map. */ 578 for (size_t i = sidx; i < eidx && pa < memory_end; i++, pa += inc) { 579 l2_pte[i] = PA_TO_PTE(pa) | PTE_KERN | PTE_HARDWIRED | PTE_RW; 580 VPRINTF("dm: %p : %#" PRIxPADDR "\n", &l2_pte[i], l2_pte[i]); 581 } 582 #endif 583 // pt_dump(printf); 584 } 585 586 static void 587 riscv_init_lwp0_uarea(void) 588 { 589 extern char lwp0uspace[]; 590 591 uvm_lwp_setuarea(&lwp0, (vaddr_t)lwp0uspace); 592 memset(&lwp0.l_md, 0, sizeof(lwp0.l_md)); 593 memset(lwp_getpcb(&lwp0), 0, sizeof(struct pcb)); 594 595 struct trapframe *tf = (struct trapframe *)(lwp0uspace + USPACE) - 1; 596 memset(tf, 0, sizeof(*tf)); 597 598 lwp0.l_md.md_utf = lwp0.l_md.md_ktf = tf; 599 } 600 601 602 static void 603 riscv_print_memory(const struct fdt_memory *m, void *arg) 604 { 605 606 VPRINTF("FDT /memory @ 0x%" PRIx64 " size 0x%" PRIx64 "\n", 607 m->start, m->end - m->start); 608 } 609 610 611 static void 612 parse_mi_bootargs(char *args) 613 { 614 int howto; 615 bool found, start, skipping; 616 617 if (args == NULL) 618 return; 619 620 start = true; 621 skipping = false; 622 for (char *cp = args; *cp; cp++) { 623 /* check for "words" starting with a "-" only */ 624 if (start) { 625 if (*cp == '-') { 626 skipping = false; 627 } else { 628 skipping = true; 629 } 630 start = false; 631 continue; 632 } 633 634 if (*cp == ' ') { 635 start = true; 636 skipping = false; 637 continue; 638 } 639 640 if (skipping) { 641 continue; 642 } 643 644 /* Check valid boot flags */ 645 howto = 0; 646 BOOT_FLAG(*cp, howto); 647 if (!howto) 648 printf("bootflag '%c' not recognised\n", *cp); 649 else 650 boothowto |= howto; 651 } 652 653 found = optstr_get(args, "root", bootdevstr, sizeof(bootdevstr)); 654 if (found) { 655 bootspec = bootdevstr; 656 } 657 } 658 659 660 void 661 init_riscv(register_t hartid, paddr_t dtb) 662 { 663 664 /* set temporally to work printf()/panic() even before consinit() */ 665 cn_tab = &earlycons; 666 667 /* Load FDT */ 668 const vaddr_t dtbva = VM_KERNEL_DTB_BASE + (dtb & (NBSEG - 1)); 669 void *fdt_data = (void *)dtbva; 670 int error = fdt_check_header(fdt_data); 671 if (error != 0) 672 panic("fdt_check_header failed: %s", fdt_strerror(error)); 673 674 fdtbus_init(fdt_data); 675 676 /* Lookup platform specific backend */ 677 const struct fdt_platform *plat = fdt_platform_find(); 678 if (plat == NULL) 679 panic("Kernel does not support this device"); 680 681 /* Early console may be available, announce ourselves. */ 682 VPRINTF("FDT<%p>\n", fdt_data); 683 684 const int chosen = OF_finddevice("/chosen"); 685 if (chosen >= 0) 686 OF_getprop(chosen, "bootargs", bootargs, sizeof(bootargs)); 687 boot_args = bootargs; 688 689 VPRINTF("devmap %p\n", plat->fp_devmap()); 690 pmap_devmap_bootstrap(0, plat->fp_devmap()); 691 692 VPRINTF("bootstrap\n"); 693 plat->fp_bootstrap(); 694 695 /* 696 * If stdout-path is specified on the command line, override the 697 * value in /chosen/stdout-path before initializing console. 698 */ 699 VPRINTF("stdout\n"); 700 fdt_update_stdout_path(fdt_data, boot_args); 701 702 /* 703 * Done making changes to the FDT. 704 */ 705 fdt_pack(fdt_data); 706 707 const uint32_t dtbsize = round_page(fdt_totalsize(fdt_data)); 708 709 VPRINTF("fdt size %x/%x\n", dtbsize, fdt_totalsize(fdt_data)); 710 711 VPRINTF("consinit "); 712 consinit(); 713 VPRINTF("ok\n"); 714 715 /* Talk to the user */ 716 printf("NetBSD/riscv (fdt) booting ...\n"); 717 718 #ifdef BOOT_ARGS 719 char mi_bootargs[] = BOOT_ARGS; 720 parse_mi_bootargs(mi_bootargs); 721 #endif 722 723 uint64_t memory_start, memory_end; 724 fdt_memory_get(&memory_start, &memory_end); 725 physical_start = memory_start; 726 physical_end = memory_end; 727 728 fdt_memory_foreach(riscv_print_memory, NULL); 729 730 /* Cannot map memory above largest page number */ 731 const uint64_t maxppn = __SHIFTOUT_MASK(PTE_PPN) - 1; 732 const uint64_t memory_limit = ptoa(maxppn); 733 734 if (memory_end > memory_limit) { 735 fdt_memory_remove_range(memory_limit, memory_end); 736 memory_end = memory_limit; 737 } 738 739 uint64_t memory_size __unused = memory_end - memory_start; 740 741 VPRINTF("%s: memory start %" PRIx64 " end %" PRIx64 " (len %" 742 PRIx64 ")\n", __func__, memory_start, memory_end, memory_size); 743 744 fdt_memory_remove_reserved(memory_start, memory_end); 745 746 fdt_memory_remove_range(dtb, dtb + dtbsize); 747 748 /* Perform PT build and VM init */ 749 cpu_kernel_vm_init(memory_start, memory_end); 750 751 VPRINTF("bootargs: %s\n", bootargs); 752 753 parse_mi_bootargs(boot_args); 754 755 #ifdef DDB 756 if (boothowto & RB_KDB) { 757 printf("Entering DDB...\n"); 758 cpu_Debugger(); 759 } 760 #endif 761 762 extern char __kernel_text[]; 763 extern char _end[]; 764 // extern char __data_start[]; 765 // extern char __rodata_start[]; 766 767 vaddr_t kernstart = trunc_page((vaddr_t)__kernel_text); 768 vaddr_t kernend = round_page((vaddr_t)_end); 769 paddr_t kernstart_phys __unused = KERN_VTOPHYS(kernstart); 770 paddr_t kernend_phys __unused = KERN_VTOPHYS(kernend); 771 772 vaddr_t kernelvmstart; 773 774 vaddr_t kernstart_mega __unused = MEGAPAGE_TRUNC(kernstart); 775 vaddr_t kernend_mega = MEGAPAGE_ROUND(kernend); 776 777 kernelvmstart = kernend_mega; 778 779 #if 0 780 #ifdef MODULAR 781 #define MODULE_RESERVED_MAX (1024 * 1024 * 128) 782 #define MODULE_RESERVED_SIZE (1024 * 1024 * 32) /* good enough? */ 783 module_start = kernelvmstart; 784 module_end = kernend_mega + MODULE_RESERVED_SIZE; 785 if (module_end >= kernstart_mega + MODULE_RESERVED_MAX) 786 module_end = kernstart_mega + MODULE_RESERVED_MAX; 787 KASSERT(module_end > kernend_mega); 788 kernelvmstart = module_end; 789 #endif /* MODULAR */ 790 #endif 791 KASSERT(kernelvmstart < VM_KERNEL_VM_BASE); 792 793 kernelvmstart = VM_KERNEL_VM_BASE; 794 795 /* 796 * msgbuf is allocated from the top of the last biggest memory block. 797 */ 798 paddr_t msgbufaddr = 0; 799 800 #ifdef _LP64 801 /* XXX check all ranges for last one with a big enough hole */ 802 msgbufaddr = memory_end - MSGBUFSIZE; 803 KASSERT(msgbufaddr != 0); /* no space for msgbuf */ 804 fdt_memory_remove_range(msgbufaddr, msgbufaddr + MSGBUFSIZE); 805 msgbufaddr = RISCV_PA_TO_KVA(msgbufaddr); 806 VPRINTF("msgbufaddr = %#lx\n", msgbufaddr); 807 initmsgbuf((void *)msgbufaddr, MSGBUFSIZE); 808 #endif 809 810 KASSERT(msgbufaddr != 0); /* no space for msgbuf */ 811 #ifdef _LP64 812 initmsgbuf((void *)RISCV_PA_TO_KVA(msgbufaddr), MSGBUFSIZE); 813 #endif 814 815 #define DPRINTF(v) VPRINTF("%24s = 0x%16lx\n", #v, (unsigned long)v); 816 817 VPRINTF("------------------------------------------\n"); 818 DPRINTF(kern_vtopdiff); 819 DPRINTF(memory_start); 820 DPRINTF(memory_end); 821 DPRINTF(memory_size); 822 DPRINTF(kernstart_phys); 823 DPRINTF(kernend_phys) 824 DPRINTF(msgbufaddr); 825 // DPRINTF(physical_end); 826 DPRINTF(VM_MIN_KERNEL_ADDRESS); 827 DPRINTF(kernstart_mega); 828 DPRINTF(kernstart); 829 DPRINTF(kernend); 830 DPRINTF(kernend_mega); 831 #if 0 832 #ifdef MODULAR 833 DPRINTF(module_start); 834 DPRINTF(module_end); 835 #endif 836 #endif 837 DPRINTF(VM_MAX_KERNEL_ADDRESS); 838 #ifdef _LP64 839 DPRINTF(pmap_direct_base); 840 #endif 841 VPRINTF("------------------------------------------\n"); 842 843 #undef DPRINTF 844 845 uvm_md_init(); 846 847 /* 848 * pass memory pages to uvm 849 */ 850 physmem = 0; 851 fdt_memory_foreach(riscv_add_memory, NULL); 852 853 pmap_bootstrap(kernelvmstart, VM_MAX_KERNEL_ADDRESS); 854 855 kasan_init(); 856 857 /* Finish setting up lwp0 on our end before we call main() */ 858 riscv_init_lwp0_uarea(); 859 } 860 861 862 #ifdef _LP64 863 static void 864 pte_bits(void (*pr)(const char *, ...), pt_entry_t pte) 865 { 866 (*pr)("%c%c%c%c%c%c%c%c", 867 (pte & PTE_D) ? 'D' : '.', 868 (pte & PTE_A) ? 'A' : '.', 869 (pte & PTE_G) ? 'G' : '.', 870 (pte & PTE_U) ? 'U' : '.', 871 (pte & PTE_X) ? 'X' : '.', 872 (pte & PTE_W) ? 'W' : '.', 873 (pte & PTE_R) ? 'R' : '.', 874 (pte & PTE_V) ? 'V' : '.'); 875 } 876 877 static void 878 dump_ln_table(paddr_t pdp_pa, int topbit, int level, vaddr_t va, 879 void (*pr)(const char *, ...) __printflike(1, 2)) 880 { 881 pd_entry_t *pdp = (void *)PMAP_DIRECT_MAP(pdp_pa); 882 883 (*pr)("l%u @ pa %#16" PRIxREGISTER "\n", level, pdp_pa); 884 for (size_t i = 0; i < PAGE_SIZE / sizeof(pd_entry_t); i++) { 885 pd_entry_t entry = pdp[i]; 886 887 if (topbit) { 888 va = i << (PGSHIFT + level * SEGLENGTH); 889 if (va & __BIT(topbit)) { 890 va |= __BITS(63, topbit); 891 } 892 } 893 if (entry != 0) { 894 paddr_t pa = __SHIFTOUT(entry, PTE_PPN) << PGSHIFT; 895 // check level PPN bits. 896 if (PTE_ISLEAF_P(entry)) { 897 (*pr)("l%u %3zu va 0x%016lx pa 0x%012lx - ", 898 level, i, va, pa); 899 pte_bits(pr, entry); 900 (*pr)("\n"); 901 } else { 902 (*pr)("l%u %3zu va 0x%016lx -> 0x%012lx - ", 903 level, i, va, pa); 904 pte_bits(pr, entry); 905 (*pr)("\n"); 906 if (level == 0) { 907 (*pr)("wtf\n"); 908 continue; 909 } 910 if (pte_pde_valid_p(entry)) 911 dump_ln_table(pa, 0, level - 1, va, pr); 912 } 913 } 914 va += 1UL << (PGSHIFT + level * SEGLENGTH); 915 } 916 } 917 918 #endif 919 920 void 921 pt_dump(void (*pr)(const char *, ...) __printflike(1, 2)) 922 { 923 const register_t satp = csr_satp_read(); 924 size_t topbit = sizeof(long) * NBBY - 1; 925 926 #ifdef _LP64 927 const paddr_t satp_pa = __SHIFTOUT(satp, SATP_PPN) << PGSHIFT; 928 const uint8_t mode = __SHIFTOUT(satp, SATP_MODE); 929 u_int level = 1; 930 931 switch (mode) { 932 case SATP_MODE_SV39: 933 case SATP_MODE_SV48: 934 topbit = (39 - 1) + (mode - 8) * SEGLENGTH; 935 level = mode - 6; 936 break; 937 } 938 #endif 939 (*pr)("topbit = %zu\n", topbit); 940 941 (*pr)("satp = 0x%" PRIxREGISTER "\n", satp); 942 #ifdef _LP64 943 dump_ln_table(satp_pa, topbit, level, 0, pr); 944 #endif 945 } 946 947 void 948 consinit(void) 949 { 950 static bool initialized = false; 951 const struct fdt_console *cons = fdtbus_get_console(); 952 const struct fdt_platform *plat = fdt_platform_find(); 953 954 if (initialized || cons == NULL) 955 return; 956 957 u_int uart_freq = 0; 958 extern struct bus_space riscv_generic_bs_tag; 959 struct fdt_attach_args faa = { 960 .faa_bst = &riscv_generic_bs_tag, 961 }; 962 963 faa.faa_phandle = fdtbus_get_stdout_phandle(); 964 if (plat->fp_uart_freq != NULL) 965 uart_freq = plat->fp_uart_freq(); 966 967 cons->consinit(&faa, uart_freq); 968 969 initialized = true; 970 } 971
Indexes created Mon Sep 29 21:09:56 GMT 2025