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 #include "opt_ddb.h"
59 #include "opt_kstack_pages.h"
60 #include "opt_platform.h"
61
62 #include <sys/param.h>
63 #include <sys/proc.h>
64 #include <sys/systm.h>
65 #include <sys/bio.h>
66 #include <sys/buf.h>
67 #include <sys/bus.h>
68 #include <sys/cons.h>
69 #include <sys/cpu.h>
70 #include <sys/eventhandler.h>
71 #include <sys/exec.h>
72 #include <sys/imgact.h>
73 #include <sys/kdb.h>
74 #include <sys/kernel.h>
75 #include <sys/ktr.h>
76 #include <sys/linker.h>
77 #include <sys/lock.h>
78 #include <sys/malloc.h>
79 #include <sys/mbuf.h>
80 #include <sys/msgbuf.h>
81 #include <sys/mutex.h>
82 #include <sys/ptrace.h>
83 #include <sys/reboot.h>
84 #include <sys/reg.h>
85 #include <sys/rwlock.h>
86 #include <sys/signalvar.h>
87 #include <sys/syscallsubr.h>
88 #include <sys/sysctl.h>
89 #include <sys/sysent.h>
90 #include <sys/sysproto.h>
91 #include <sys/ucontext.h>
92 #include <sys/uio.h>
93 #include <sys/vmmeter.h>
94 #include <sys/vnode.h>
95
96 #include <net/netisr.h>
97
98 #include <vm/vm.h>
99 #include <vm/vm_extern.h>
100 #include <vm/vm_kern.h>
101 #include <vm/vm_page.h>
102 #include <vm/vm_phys.h>
103 #include <vm/vm_map.h>
104 #include <vm/vm_object.h>
105 #include <vm/vm_pager.h>
106
107 #include <machine/altivec.h>
108 #ifndef __powerpc64__
109 #include <machine/bat.h>
110 #endif
111 #include <machine/cpu.h>
112 #include <machine/elf.h>
113 #include <machine/fpu.h>
114 #include <machine/hid.h>
115 #include <machine/ifunc.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/sigframe.h>
122 #include <machine/spr.h>
123 #include <machine/trap.h>
124 #include <machine/vmparam.h>
125 #include <machine/ofw_machdep.h>
126
127 #include <ddb/ddb.h>
128
129 #include <dev/ofw/openfirm.h>
130 #include <dev/ofw/ofw_subr.h>
131
132 int cold = 1;
133 #ifdef __powerpc64__
134 int cacheline_size = 128;
135 #else
136 int cacheline_size = 32;
137 #endif
138 #ifdef __powerpc64__
139 int hw_direct_map = -1;
140 #else
141 int hw_direct_map = 1;
142 #endif
143
144 #ifdef BOOKE
145 extern vm_paddr_t kernload;
146 #endif
147
148 extern void *ap_pcpu;
149
150 struct pcpu __pcpu[MAXCPU] __aligned(PAGE_SIZE);
151 static char init_kenv[2048];
152
153 static struct trapframe frame0;
154
155 char machine[] = "powerpc";
156 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD | CTLFLAG_CAPRD, machine, 0, "");
157
158 static void cpu_startup(void *);
159 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
160
161 SYSCTL_INT(_machdep, CPU_CACHELINE, cacheline_size,
162 CTLFLAG_RD, &cacheline_size, 0, "");
163
164 uintptr_t powerpc_init(vm_offset_t, vm_offset_t, vm_offset_t, void *,
165 uint32_t);
166
167 static void fake_preload_metadata(void);
168
169 long Maxmem = 0;
170 long realmem = 0;
171
172 /* Default MSR values set in the AIM/Book-E early startup code */
173 register_t psl_kernset;
174 register_t psl_userset;
175 register_t psl_userstatic;
176 #ifdef __powerpc64__
177 register_t psl_userset32;
178 #endif
179
180 struct kva_md_info kmi;
181
182 static void
cpu_startup(void * dummy)183 cpu_startup(void *dummy)
184 {
185
186 /*
187 * Initialise the decrementer-based clock.
188 */
189 decr_init();
190
191 /*
192 * Good {morning,afternoon,evening,night}.
193 */
194 cpu_setup(PCPU_GET(cpuid));
195
196 #ifdef PERFMON
197 perfmon_init();
198 #endif
199 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)physmem),
200 ptoa((uintmax_t)physmem) / 1048576);
201 realmem = physmem;
202
203 if (bootverbose)
204 printf("available KVA = %zu (%zu MB)\n",
205 virtual_end - virtual_avail,
206 (virtual_end - virtual_avail) / 1048576);
207
208 /*
209 * Display any holes after the first chunk of extended memory.
210 */
211 if (bootverbose) {
212 int indx;
213
214 printf("Physical memory chunk(s):\n");
215 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
216 vm_paddr_t size1 =
217 phys_avail[indx + 1] - phys_avail[indx];
218
219 #ifdef __powerpc64__
220 printf("0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
221 #else
222 printf("0x%09jx - 0x%09jx, %ju bytes (%ju pages)\n",
223 #endif
224 (uintmax_t)phys_avail[indx],
225 (uintmax_t)phys_avail[indx + 1] - 1,
226 (uintmax_t)size1, (uintmax_t)size1 / PAGE_SIZE);
227 }
228 }
229
230 vm_ksubmap_init(&kmi);
231
232 printf("avail memory = %ju (%ju MB)\n",
233 ptoa((uintmax_t)vm_free_count()),
234 ptoa((uintmax_t)vm_free_count()) / 1048576);
235
236 /*
237 * Set up buffers, so they can be used to read disk labels.
238 */
239 bufinit();
240 vm_pager_bufferinit();
241 }
242
243 extern vm_offset_t __startkernel, __endkernel;
244 extern unsigned char __bss_start[];
245 extern unsigned char __sbss_start[];
246 extern unsigned char __sbss_end[];
247 extern unsigned char _end[];
248
249 void aim_early_init(vm_offset_t fdt, vm_offset_t toc, vm_offset_t ofentry,
250 void *mdp, uint32_t mdp_cookie);
251 void aim_cpu_init(vm_offset_t toc);
252 void booke_cpu_init(void);
253
254 #ifdef DDB
255 static void load_external_symtab(void);
256 #endif
257
258 uintptr_t
powerpc_init(vm_offset_t fdt,vm_offset_t toc,vm_offset_t ofentry,void * mdp,uint32_t mdp_cookie)259 powerpc_init(vm_offset_t fdt, vm_offset_t toc, vm_offset_t ofentry, void *mdp,
260 uint32_t mdp_cookie)
261 {
262 struct pcpu *pc;
263 struct cpuref bsp;
264 vm_offset_t startkernel, endkernel;
265 char *env;
266 void *kmdp = NULL;
267 bool ofw_bootargs = false;
268 #ifdef DDB
269 bool symbols_provided = false;
270 vm_offset_t ksym_start;
271 vm_offset_t ksym_end;
272 #endif
273
274 /* First guess at start/end kernel positions */
275 startkernel = __startkernel;
276 endkernel = __endkernel;
277
278 /*
279 * If the metadata pointer cookie is not set to the magic value,
280 * the number in mdp should be treated as nonsense.
281 */
282 if (mdp_cookie != 0xfb5d104d)
283 mdp = NULL;
284
285 #if !defined(BOOKE)
286 /*
287 * On BOOKE the BSS is already cleared and some variables
288 * initialized. Do not wipe them out.
289 */
290 bzero(__sbss_start, __sbss_end - __sbss_start);
291 bzero(__bss_start, _end - __bss_start);
292 #endif
293
294 cpu_feature_setup();
295
296 #ifdef AIM
297 aim_early_init(fdt, toc, ofentry, mdp, mdp_cookie);
298 #endif
299
300 /*
301 * At this point, we are executing in our correct memory space.
302 * Book-E started there, and AIM has done an rfi and restarted
303 * execution from _start.
304 *
305 * We may still be in real mode, however. If we are running out of
306 * the direct map on 64 bit, this is possible to do.
307 */
308
309 /*
310 * Parse metadata if present and fetch parameters. Must be done
311 * before console is inited so cninit gets the right value of
312 * boothowto.
313 */
314 if (mdp != NULL) {
315 /*
316 * Starting up from loader.
317 *
318 * Full metadata has been provided, but we need to figure
319 * out the correct address to relocate it to.
320 */
321 char *envp = NULL;
322 uintptr_t md_offset = 0;
323 vm_paddr_t kernelendphys;
324
325 #ifdef AIM
326 if ((uintptr_t)&powerpc_init > DMAP_BASE_ADDRESS)
327 md_offset = DMAP_BASE_ADDRESS;
328 #else /* BOOKE */
329 md_offset = VM_MIN_KERNEL_ADDRESS - kernload;
330 #endif
331
332 preload_metadata = mdp;
333 if (md_offset > 0) {
334 /* Translate phys offset into DMAP offset. */
335 preload_metadata += md_offset;
336 preload_bootstrap_relocate(md_offset);
337 }
338 kmdp = preload_search_by_type("elf kernel");
339 if (kmdp != NULL) {
340 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
341 envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
342 if (envp != NULL)
343 envp += md_offset;
344 init_static_kenv(envp, 0);
345 if (fdt == 0) {
346 fdt = MD_FETCH(kmdp, MODINFOMD_DTBP, uintptr_t);
347 if (fdt != 0)
348 fdt += md_offset;
349 }
350 /* kernelstartphys is already relocated. */
351 kernelendphys = MD_FETCH(kmdp, MODINFOMD_KERNEND,
352 vm_offset_t);
353 if (kernelendphys != 0)
354 kernelendphys += md_offset;
355 endkernel = ulmax(endkernel, kernelendphys);
356 #ifdef DDB
357 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
358 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
359
360 db_fetch_ksymtab(ksym_start, ksym_end, md_offset);
361 /* Symbols provided by loader. */
362 symbols_provided = true;
363 #endif
364 }
365 } else {
366 /*
367 * Self-loading kernel, we have to fake up metadata.
368 *
369 * Since we are creating the metadata from the final
370 * memory space, we don't need to call
371 * preload_boostrap_relocate().
372 */
373 fake_preload_metadata();
374 kmdp = preload_search_by_type("elf kernel");
375 init_static_kenv(init_kenv, sizeof(init_kenv));
376 ofw_bootargs = true;
377 }
378
379 /* Store boot environment state */
380 OF_initial_setup((void *)fdt, NULL, (int (*)(void *))ofentry);
381
382 /*
383 * Init params/tunables that can be overridden by the loader
384 */
385 init_param1();
386
387 /*
388 * Start initializing proc0 and thread0.
389 */
390 proc_linkup0(&proc0, &thread0);
391 thread0.td_frame = &frame0;
392 #ifdef __powerpc64__
393 __asm __volatile("mr 13,%0" :: "r"(&thread0));
394 #else
395 __asm __volatile("mr 2,%0" :: "r"(&thread0));
396 #endif
397
398 /*
399 * Init mutexes, which we use heavily in PMAP
400 */
401 mutex_init();
402
403 /*
404 * Install the OF client interface
405 */
406 OF_bootstrap();
407
408 #ifdef DDB
409 if (!symbols_provided && hw_direct_map)
410 load_external_symtab();
411 #endif
412
413 if (ofw_bootargs)
414 ofw_parse_bootargs();
415
416 #ifdef AIM
417 /*
418 * Early I/O map needs to be initialized before console, in order to
419 * map frame buffers properly, and after boot args have been parsed,
420 * to handle tunables properly.
421 */
422 pmap_early_io_map_init();
423 #endif
424
425 /*
426 * Initialize the console before printing anything.
427 */
428 cninit();
429
430 #ifdef AIM
431 aim_cpu_init(toc);
432 #else /* BOOKE */
433 booke_cpu_init();
434
435 /* Make sure the kernel icache is valid before we go too much further */
436 __syncicache((caddr_t)startkernel, endkernel - startkernel);
437 #endif
438
439 /*
440 * Choose a platform module so we can get the physical memory map.
441 */
442
443 platform_probe_and_attach();
444
445 /*
446 * Set up per-cpu data for the BSP now that the platform can tell
447 * us which that is.
448 */
449 if (platform_smp_get_bsp(&bsp) != 0)
450 bsp.cr_cpuid = 0;
451 pc = &__pcpu[bsp.cr_cpuid];
452 __asm __volatile("mtsprg 0, %0" :: "r"(pc));
453 pcpu_init(pc, bsp.cr_cpuid, sizeof(struct pcpu));
454 pc->pc_curthread = &thread0;
455 thread0.td_oncpu = bsp.cr_cpuid;
456 pc->pc_cpuid = bsp.cr_cpuid;
457 pc->pc_hwref = bsp.cr_hwref;
458
459 /*
460 * Init KDB
461 */
462 kdb_init();
463
464 /*
465 * Bring up MMU
466 */
467 pmap_mmu_init();
468 link_elf_ireloc(kmdp);
469 pmap_bootstrap(startkernel, endkernel);
470 mtmsr(psl_kernset & ~PSL_EE);
471
472 /*
473 * Initialize params/tunables that are derived from memsize
474 */
475 init_param2(physmem);
476
477 /*
478 * Grab booted kernel's name
479 */
480 env = kern_getenv("kernelname");
481 if (env != NULL) {
482 strlcpy(kernelname, env, sizeof(kernelname));
483 freeenv(env);
484 }
485
486 /*
487 * Finish setting up thread0.
488 */
489 thread0.td_pcb = (struct pcb *)
490 ((thread0.td_kstack + thread0.td_kstack_pages * PAGE_SIZE -
491 sizeof(struct pcb)) & ~15UL);
492 bzero((void *)thread0.td_pcb, sizeof(struct pcb));
493 pc->pc_curpcb = thread0.td_pcb;
494
495 /* Initialise the message buffer. */
496 msgbufinit(msgbufp, msgbufsize);
497
498 #ifdef KDB
499 if (boothowto & RB_KDB)
500 kdb_enter(KDB_WHY_BOOTFLAGS,
501 "Boot flags requested debugger");
502 #endif
503
504 return (((uintptr_t)thread0.td_pcb -
505 (sizeof(struct callframe) - 3*sizeof(register_t))) & ~15UL);
506 }
507
508 #ifdef DDB
509 /*
510 * On powernv and some booke systems, we might not have symbols loaded via
511 * loader. However, if the user passed the kernel in as the initrd as well,
512 * we can manually load it via reinterpreting the initrd copy of the kernel.
513 *
514 * In the BOOKE case, we don't actually have a DMAP yet, so we have to use
515 * temporary maps to inspect the memory, but write DMAP addresses to the
516 * configuration variables.
517 */
518 static void
load_external_symtab(void)519 load_external_symtab(void) {
520 phandle_t chosen;
521 vm_paddr_t start, end;
522 pcell_t cell[2];
523 ssize_t size;
524 u_char *kernelimg; /* Temporary map */
525 u_char *kernelimg_final; /* Final location */
526
527 int i;
528
529 Elf_Ehdr *ehdr;
530 Elf_Shdr *shdr;
531
532 vm_offset_t ksym_start, ksym_sz, kstr_start, kstr_sz,
533 ksym_start_final, kstr_start_final;
534
535 if (!hw_direct_map)
536 return;
537
538 chosen = OF_finddevice("/chosen");
539 if (chosen <= 0)
540 return;
541
542 if (!OF_hasprop(chosen, "linux,initrd-start") ||
543 !OF_hasprop(chosen, "linux,initrd-end"))
544 return;
545
546 size = OF_getencprop(chosen, "linux,initrd-start", cell, sizeof(cell));
547 if (size == 4)
548 start = cell[0];
549 else if (size == 8)
550 start = (uint64_t)cell[0] << 32 | cell[1];
551 else
552 return;
553
554 size = OF_getencprop(chosen, "linux,initrd-end", cell, sizeof(cell));
555 if (size == 4)
556 end = cell[0];
557 else if (size == 8)
558 end = (uint64_t)cell[0] << 32 | cell[1];
559 else
560 return;
561
562 if (!(end - start > 0))
563 return;
564
565 kernelimg_final = (u_char *) PHYS_TO_DMAP(start);
566 #ifdef AIM
567 kernelimg = kernelimg_final;
568 #else /* BOOKE */
569 kernelimg = (u_char *)pmap_early_io_map(start, PAGE_SIZE);
570 #endif
571 ehdr = (Elf_Ehdr *)kernelimg;
572
573 if (!IS_ELF(*ehdr)) {
574 #ifdef BOOKE
575 pmap_early_io_unmap(start, PAGE_SIZE);
576 #endif
577 return;
578 }
579
580 #ifdef BOOKE
581 pmap_early_io_unmap(start, PAGE_SIZE);
582 kernelimg = (u_char *)pmap_early_io_map(start, (end - start));
583 #endif
584
585 shdr = (Elf_Shdr *)(kernelimg + ehdr->e_shoff);
586
587 ksym_start = 0;
588 ksym_sz = 0;
589 ksym_start_final = 0;
590 kstr_start = 0;
591 kstr_sz = 0;
592 kstr_start_final = 0;
593 for (i = 0; i < ehdr->e_shnum; i++) {
594 if (shdr[i].sh_type == SHT_SYMTAB) {
595 ksym_start = (vm_offset_t)(kernelimg +
596 shdr[i].sh_offset);
597 ksym_start_final = (vm_offset_t)
598 (kernelimg_final + shdr[i].sh_offset);
599 ksym_sz = (vm_offset_t)(shdr[i].sh_size);
600 kstr_start = (vm_offset_t)(kernelimg +
601 shdr[shdr[i].sh_link].sh_offset);
602 kstr_start_final = (vm_offset_t)
603 (kernelimg_final +
604 shdr[shdr[i].sh_link].sh_offset);
605
606 kstr_sz = (vm_offset_t)
607 (shdr[shdr[i].sh_link].sh_size);
608 }
609 }
610
611 if (ksym_start != 0 && kstr_start != 0 && ksym_sz != 0 &&
612 kstr_sz != 0 && ksym_start < kstr_start) {
613 /*
614 * We can't use db_fetch_ksymtab() here, because we need to
615 * feed in DMAP addresses that are not mapped yet on booke.
616 *
617 * Write the variables directly, where db_init() will pick
618 * them up later, after the DMAP is up.
619 */
620 ksymtab = ksym_start_final;
621 ksymtab_size = ksym_sz;
622 kstrtab = kstr_start_final;
623 ksymtab_relbase = (__startkernel - KERNBASE);
624 }
625
626 #ifdef BOOKE
627 pmap_early_io_unmap(start, (end - start));
628 #endif
629
630 };
631 #endif
632
633 /*
634 * When not being loaded from loader, we need to create our own metadata
635 * so we can interact with the kernel linker.
636 */
637 static void
fake_preload_metadata(void)638 fake_preload_metadata(void) {
639 /* We depend on dword alignment here. */
640 static uint32_t fake_preload[36] __aligned(8);
641 int i = 0;
642
643 fake_preload[i++] = MODINFO_NAME;
644 fake_preload[i++] = strlen("kernel") + 1;
645 strcpy((char*)&fake_preload[i], "kernel");
646 /* ['k' 'e' 'r' 'n'] ['e' 'l' '\0' ..] */
647 i += 2;
648
649 fake_preload[i++] = MODINFO_TYPE;
650 fake_preload[i++] = strlen("elf kernel") + 1;
651 strcpy((char*)&fake_preload[i], "elf kernel");
652 /* ['e' 'l' 'f' ' '] ['k' 'e' 'r' 'n'] ['e' 'l' '\0' ..] */
653 i += 3;
654
655 #ifdef __powerpc64__
656 /* Padding -- Fields start on u_long boundaries */
657 fake_preload[i++] = 0;
658 #endif
659
660 fake_preload[i++] = MODINFO_ADDR;
661 fake_preload[i++] = sizeof(vm_offset_t);
662 *(vm_offset_t *)&fake_preload[i] =
663 (vm_offset_t)(__startkernel);
664 i += (sizeof(vm_offset_t) / 4);
665
666 fake_preload[i++] = MODINFO_SIZE;
667 fake_preload[i++] = sizeof(vm_offset_t);
668 *(vm_offset_t *)&fake_preload[i] =
669 (vm_offset_t)(__endkernel) - (vm_offset_t)(__startkernel);
670 i += (sizeof(vm_offset_t) / 4);
671
672 /*
673 * MODINFOMD_SSYM and MODINFOMD_ESYM cannot be provided here,
674 * as the memory comes from outside the loaded ELF sections.
675 *
676 * If the symbols are being provided by other means (MFS), the
677 * tables will be loaded into the debugger directly.
678 */
679
680 /* Null field at end to mark end of data. */
681 fake_preload[i++] = 0;
682 fake_preload[i] = 0;
683 preload_metadata = (void*)fake_preload;
684 }
685
686 /*
687 * Flush the D-cache for non-DMA I/O so that the I-cache can
688 * be made coherent later.
689 */
690 void
cpu_flush_dcache(void * ptr,size_t len)691 cpu_flush_dcache(void *ptr, size_t len)
692 {
693 register_t addr, off;
694
695 /*
696 * Align the address to a cacheline and adjust the length
697 * accordingly. Then round the length to a multiple of the
698 * cacheline for easy looping.
699 */
700 addr = (uintptr_t)ptr;
701 off = addr & (cacheline_size - 1);
702 addr -= off;
703 len = roundup2(len + off, cacheline_size);
704
705 while (len > 0) {
706 __asm __volatile ("dcbf 0,%0" :: "r"(addr));
707 __asm __volatile ("sync");
708 addr += cacheline_size;
709 len -= cacheline_size;
710 }
711 }
712
713 int
ptrace_set_pc(struct thread * td,unsigned long addr)714 ptrace_set_pc(struct thread *td, unsigned long addr)
715 {
716 struct trapframe *tf;
717
718 tf = td->td_frame;
719 tf->srr0 = (register_t)addr;
720
721 return (0);
722 }
723
724 void
spinlock_enter(void)725 spinlock_enter(void)
726 {
727 struct thread *td;
728 register_t msr;
729
730 td = curthread;
731 if (td->td_md.md_spinlock_count == 0) {
732 nop_prio_mhigh();
733 msr = intr_disable();
734 td->td_md.md_spinlock_count = 1;
735 td->td_md.md_saved_msr = msr;
736 critical_enter();
737 } else
738 td->td_md.md_spinlock_count++;
739 }
740
741 void
spinlock_exit(void)742 spinlock_exit(void)
743 {
744 struct thread *td;
745 register_t msr;
746
747 td = curthread;
748 msr = td->td_md.md_saved_msr;
749 td->td_md.md_spinlock_count--;
750 if (td->td_md.md_spinlock_count == 0) {
751 critical_exit();
752 intr_restore(msr);
753 nop_prio_medium();
754 }
755 }
756
757 /*
758 * Simple ddb(4) command/hack to view any SPR on the running CPU.
759 * Uses a trivial asm function to perform the mfspr, and rewrites the mfspr
760 * instruction each time.
761 * XXX: Since it uses code modification, it won't work if the kernel code pages
762 * are marked RO.
763 */
764 extern register_t get_spr(int);
765
766 #ifdef DDB
DB_SHOW_COMMAND(spr,db_show_spr)767 DB_SHOW_COMMAND(spr, db_show_spr)
768 {
769 register_t spr;
770 volatile uint32_t *p;
771 int sprno, saved_sprno;
772
773 if (!have_addr)
774 return;
775
776 saved_sprno = sprno = (intptr_t) addr;
777 sprno = ((sprno & 0x3e0) >> 5) | ((sprno & 0x1f) << 5);
778 p = (uint32_t *)(void *)&get_spr;
779 #ifdef __powerpc64__
780 #if defined(_CALL_ELF) && _CALL_ELF == 2
781 /* Account for ELFv2 function prologue. */
782 p += 2;
783 #else
784 p = *(volatile uint32_t * volatile *)p;
785 #endif
786 #endif
787 *p = (*p & ~0x001ff800) | (sprno << 11);
788 __syncicache(__DEVOLATILE(uint32_t *, p), cacheline_size);
789 spr = get_spr(sprno);
790
791 db_printf("SPR %d(%x): %lx\n", saved_sprno, saved_sprno,
792 (unsigned long)spr);
793 }
794
DB_SHOW_COMMAND(frame,db_show_frame)795 DB_SHOW_COMMAND(frame, db_show_frame)
796 {
797 struct trapframe *tf;
798 long reg;
799 int i;
800
801 tf = have_addr ? (struct trapframe *)addr : curthread->td_frame;
802
803 /*
804 * Everything casts through long to simplify the printing.
805 * 'long' is native register size anyway.
806 */
807 db_printf("trap frame %p\n", tf);
808 for (i = 0; i < nitems(tf->fixreg); i++) {
809 reg = tf->fixreg[i];
810 db_printf(" r%d:\t%#lx (%ld)\n", i, reg, reg);
811 }
812 reg = tf->lr;
813 db_printf(" lr:\t%#lx\n", reg);
814 reg = tf->cr;
815 db_printf(" cr:\t%#lx\n", reg);
816 reg = tf->xer;
817 db_printf(" xer:\t%#lx\n", reg);
818 reg = tf->ctr;
819 db_printf(" ctr:\t%#lx (%ld)\n", reg, reg);
820 reg = tf->srr0;
821 db_printf(" srr0:\t%#lx\n", reg);
822 reg = tf->srr1;
823 db_printf(" srr1:\t%#lx\n", reg);
824 reg = tf->exc;
825 db_printf(" exc:\t%#lx\n", reg);
826 reg = tf->dar;
827 db_printf(" dar:\t%#lx\n", reg);
828 #ifdef AIM
829 reg = tf->cpu.aim.dsisr;
830 db_printf(" dsisr:\t%#lx\n", reg);
831 #else
832 reg = tf->cpu.booke.esr;
833 db_printf(" esr:\t%#lx\n", reg);
834 reg = tf->cpu.booke.dbcr0;
835 db_printf(" dbcr0:\t%#lx\n", reg);
836 #endif
837 }
838 #endif
839
840 /* __stack_chk_fail_local() is called in secure-plt (32-bit). */
841 #if !defined(__powerpc64__)
842 extern void __stack_chk_fail(void);
843 void __stack_chk_fail_local(void);
844
845 void
__stack_chk_fail_local(void)846 __stack_chk_fail_local(void)
847 {
848
849 __stack_chk_fail();
850 }
851 #endif
852