FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/machdep.c
1 /* $NetBSD: arm32_machdep.c,v 1.44 2004/03/24 15:34:47 atatat Exp $ */
2
3 /*-
4 * Copyright (c) 2004 Olivier Houchard
5 * Copyright (c) 1994-1998 Mark Brinicombe.
6 * Copyright (c) 1994 Brini.
7 * All rights reserved.
8 *
9 * This code is derived from software written for Brini by Mark Brinicombe
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by Mark Brinicombe
22 * for the NetBSD Project.
23 * 4. The name of the company nor the name of the author may be used to
24 * endorse or promote products derived from this software without specific
25 * prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
28 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
29 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
30 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
31 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
32 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
33 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * Machine dependent functions for kernel setup
40 *
41 * Created : 17/09/94
42 * Updated : 18/04/01 updated for new wscons
43 */
44
45 #include "opt_compat.h"
46 #include "opt_ddb.h"
47 #include "opt_kstack_pages.h"
48 #include "opt_platform.h"
49 #include "opt_sched.h"
50 #include "opt_timer.h"
51
52 #include <sys/cdefs.h>
53 __FBSDID("$FreeBSD: releng/11.2/sys/arm/arm/machdep.c 331988 2018-04-04 06:11:05Z mmel $");
54
55 #include <sys/param.h>
56 #include <sys/buf.h>
57 #include <sys/bus.h>
58 #include <sys/cons.h>
59 #include <sys/cpu.h>
60 #include <sys/devmap.h>
61 #include <sys/efi.h>
62 #include <sys/imgact.h>
63 #include <sys/kdb.h>
64 #include <sys/kernel.h>
65 #include <sys/linker.h>
66 #include <sys/msgbuf.h>
67 #include <sys/reboot.h>
68 #include <sys/rwlock.h>
69 #include <sys/sched.h>
70 #include <sys/syscallsubr.h>
71 #include <sys/sysent.h>
72 #include <sys/sysproto.h>
73 #include <sys/vmmeter.h>
74
75 #include <vm/vm_object.h>
76 #include <vm/vm_page.h>
77 #include <vm/vm_pager.h>
78
79 #include <machine/debug_monitor.h>
80 #include <machine/machdep.h>
81 #include <machine/metadata.h>
82 #include <machine/pcb.h>
83 #include <machine/physmem.h>
84 #include <machine/platform.h>
85 #include <machine/sysarch.h>
86 #include <machine/undefined.h>
87 #include <machine/vfp.h>
88 #include <machine/vmparam.h>
89
90 #ifdef FDT
91 #include <dev/fdt/fdt_common.h>
92 #include <machine/ofw_machdep.h>
93 #endif
94
95 #ifdef DEBUG
96 #define debugf(fmt, args...) printf(fmt, ##args)
97 #else
98 #define debugf(fmt, args...)
99 #endif
100
101 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
102 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \
103 defined(COMPAT_FREEBSD9)
104 #error FreeBSD/arm doesn't provide compatibility with releases prior to 10
105 #endif
106
107 struct pcpu __pcpu[MAXCPU];
108 struct pcpu *pcpup = &__pcpu[0];
109
110 static struct trapframe proc0_tf;
111 uint32_t cpu_reset_address = 0;
112 int cold = 1;
113 vm_offset_t vector_page;
114
115 int (*_arm_memcpy)(void *, void *, int, int) = NULL;
116 int (*_arm_bzero)(void *, int, int) = NULL;
117 int _min_memcpy_size = 0;
118 int _min_bzero_size = 0;
119
120 extern int *end;
121
122 #ifdef FDT
123 vm_paddr_t pmap_pa;
124 #if __ARM_ARCH >= 6
125 vm_offset_t systempage;
126 vm_offset_t irqstack;
127 vm_offset_t undstack;
128 vm_offset_t abtstack;
129 #else
130 /*
131 * This is the number of L2 page tables required for covering max
132 * (hypothetical) memsize of 4GB and all kernel mappings (vectors, msgbuf,
133 * stacks etc.), uprounded to be divisible by 4.
134 */
135 #define KERNEL_PT_MAX 78
136 static struct pv_addr kernel_pt_table[KERNEL_PT_MAX];
137 struct pv_addr systempage;
138 static struct pv_addr msgbufpv;
139 struct pv_addr irqstack;
140 struct pv_addr undstack;
141 struct pv_addr abtstack;
142 static struct pv_addr kernelstack;
143 #endif /* __ARM_ARCH >= 6 */
144 #endif /* FDT */
145
146 #ifdef MULTIDELAY
147 static delay_func *delay_impl;
148 static void *delay_arg;
149 #endif
150
151 struct kva_md_info kmi;
152
153 /*
154 * arm32_vector_init:
155 *
156 * Initialize the vector page, and select whether or not to
157 * relocate the vectors.
158 *
159 * NOTE: We expect the vector page to be mapped at its expected
160 * destination.
161 */
162
163 extern unsigned int page0[], page0_data[];
164 void
165 arm_vector_init(vm_offset_t va, int which)
166 {
167 unsigned int *vectors = (int *) va;
168 unsigned int *vectors_data = vectors + (page0_data - page0);
169 int vec;
170
171 /*
172 * Loop through the vectors we're taking over, and copy the
173 * vector's insn and data word.
174 */
175 for (vec = 0; vec < ARM_NVEC; vec++) {
176 if ((which & (1 << vec)) == 0) {
177 /* Don't want to take over this vector. */
178 continue;
179 }
180 vectors[vec] = page0[vec];
181 vectors_data[vec] = page0_data[vec];
182 }
183
184 /* Now sync the vectors. */
185 icache_sync(va, (ARM_NVEC * 2) * sizeof(u_int));
186
187 vector_page = va;
188 #if __ARM_ARCH < 6
189 if (va == ARM_VECTORS_HIGH) {
190 /*
191 * Enable high vectors in the system control reg (SCTLR).
192 *
193 * Assume the MD caller knows what it's doing here, and really
194 * does want the vector page relocated.
195 *
196 * Note: This has to be done here (and not just in
197 * cpu_setup()) because the vector page needs to be
198 * accessible *before* cpu_startup() is called.
199 * Think ddb(9) ...
200 */
201 cpu_control(CPU_CONTROL_VECRELOC, CPU_CONTROL_VECRELOC);
202 }
203 #endif
204 }
205
206 static void
207 cpu_startup(void *dummy)
208 {
209 struct pcb *pcb = thread0.td_pcb;
210 const unsigned int mbyte = 1024 * 1024;
211 #if __ARM_ARCH < 6 && !defined(ARM_CACHE_LOCK_ENABLE)
212 vm_page_t m;
213 #endif
214
215 identify_arm_cpu();
216
217 vm_ksubmap_init(&kmi);
218
219 /*
220 * Display the RAM layout.
221 */
222 printf("real memory = %ju (%ju MB)\n",
223 (uintmax_t)arm32_ptob(realmem),
224 (uintmax_t)arm32_ptob(realmem) / mbyte);
225 printf("avail memory = %ju (%ju MB)\n",
226 (uintmax_t)arm32_ptob(vm_cnt.v_free_count),
227 (uintmax_t)arm32_ptob(vm_cnt.v_free_count) / mbyte);
228 if (bootverbose) {
229 arm_physmem_print_tables();
230 devmap_print_table();
231 }
232
233 bufinit();
234 vm_pager_bufferinit();
235 pcb->pcb_regs.sf_sp = (u_int)thread0.td_kstack +
236 USPACE_SVC_STACK_TOP;
237 pmap_set_pcb_pagedir(kernel_pmap, pcb);
238 #if __ARM_ARCH < 6
239 vector_page_setprot(VM_PROT_READ);
240 pmap_postinit();
241 #ifdef ARM_CACHE_LOCK_ENABLE
242 pmap_kenter_user(ARM_TP_ADDRESS, ARM_TP_ADDRESS);
243 arm_lock_cache_line(ARM_TP_ADDRESS);
244 #else
245 m = vm_page_alloc(NULL, 0, VM_ALLOC_NOOBJ | VM_ALLOC_ZERO);
246 pmap_kenter_user(ARM_TP_ADDRESS, VM_PAGE_TO_PHYS(m));
247 #endif
248 *(uint32_t *)ARM_RAS_START = 0;
249 *(uint32_t *)ARM_RAS_END = 0xffffffff;
250 #endif
251 }
252
253 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
254
255 /*
256 * Flush the D-cache for non-DMA I/O so that the I-cache can
257 * be made coherent later.
258 */
259 void
260 cpu_flush_dcache(void *ptr, size_t len)
261 {
262
263 dcache_wb_poc((vm_offset_t)ptr, (vm_paddr_t)vtophys(ptr), len);
264 }
265
266 /* Get current clock frequency for the given cpu id. */
267 int
268 cpu_est_clockrate(int cpu_id, uint64_t *rate)
269 {
270
271 return (ENXIO);
272 }
273
274 void
275 cpu_idle(int busy)
276 {
277
278 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d", busy, curcpu);
279 spinlock_enter();
280 #ifndef NO_EVENTTIMERS
281 if (!busy)
282 cpu_idleclock();
283 #endif
284 if (!sched_runnable())
285 cpu_sleep(0);
286 #ifndef NO_EVENTTIMERS
287 if (!busy)
288 cpu_activeclock();
289 #endif
290 spinlock_exit();
291 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d done", busy, curcpu);
292 }
293
294 int
295 cpu_idle_wakeup(int cpu)
296 {
297
298 return (0);
299 }
300
301 /*
302 * Most ARM platforms don't need to do anything special to init their clocks
303 * (they get intialized during normal device attachment), and by not defining a
304 * cpu_initclocks() function they get this generic one. Any platform that needs
305 * to do something special can just provide their own implementation, which will
306 * override this one due to the weak linkage.
307 */
308 void
309 arm_generic_initclocks(void)
310 {
311
312 #ifndef NO_EVENTTIMERS
313 #ifdef SMP
314 if (PCPU_GET(cpuid) == 0)
315 cpu_initclocks_bsp();
316 else
317 cpu_initclocks_ap();
318 #else
319 cpu_initclocks_bsp();
320 #endif
321 #endif
322 }
323 __weak_reference(arm_generic_initclocks, cpu_initclocks);
324
325 #ifdef MULTIDELAY
326 void
327 arm_set_delay(delay_func *impl, void *arg)
328 {
329
330 KASSERT(impl != NULL, ("No DELAY implementation"));
331 delay_impl = impl;
332 delay_arg = arg;
333 }
334
335 void
336 DELAY(int usec)
337 {
338
339 delay_impl(usec, delay_arg);
340 }
341 #endif
342
343 void
344 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
345 {
346 }
347
348 void
349 spinlock_enter(void)
350 {
351 struct thread *td;
352 register_t cspr;
353
354 td = curthread;
355 if (td->td_md.md_spinlock_count == 0) {
356 cspr = disable_interrupts(PSR_I | PSR_F);
357 td->td_md.md_spinlock_count = 1;
358 td->td_md.md_saved_cspr = cspr;
359 } else
360 td->td_md.md_spinlock_count++;
361 critical_enter();
362 }
363
364 void
365 spinlock_exit(void)
366 {
367 struct thread *td;
368 register_t cspr;
369
370 td = curthread;
371 critical_exit();
372 cspr = td->td_md.md_saved_cspr;
373 td->td_md.md_spinlock_count--;
374 if (td->td_md.md_spinlock_count == 0)
375 restore_interrupts(cspr);
376 }
377
378 /*
379 * Clear registers on exec
380 */
381 void
382 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
383 {
384 struct trapframe *tf = td->td_frame;
385
386 memset(tf, 0, sizeof(*tf));
387 tf->tf_usr_sp = stack;
388 tf->tf_usr_lr = imgp->entry_addr;
389 tf->tf_svc_lr = 0x77777777;
390 tf->tf_pc = imgp->entry_addr;
391 tf->tf_spsr = PSR_USR32_MODE;
392 }
393
394
395 #ifdef VFP
396 /*
397 * Get machine VFP context.
398 */
399 void
400 get_vfpcontext(struct thread *td, mcontext_vfp_t *vfp)
401 {
402 struct pcb *pcb;
403
404 pcb = td->td_pcb;
405 if (td == curthread) {
406 critical_enter();
407 vfp_store(&pcb->pcb_vfpstate, false);
408 critical_exit();
409 } else
410 MPASS(TD_IS_SUSPENDED(td));
411 memcpy(vfp->mcv_reg, pcb->pcb_vfpstate.reg,
412 sizeof(vfp->mcv_reg));
413 vfp->mcv_fpscr = pcb->pcb_vfpstate.fpscr;
414 }
415
416 /*
417 * Set machine VFP context.
418 */
419 void
420 set_vfpcontext(struct thread *td, mcontext_vfp_t *vfp)
421 {
422 struct pcb *pcb;
423
424 pcb = td->td_pcb;
425 if (td == curthread) {
426 critical_enter();
427 vfp_discard(td);
428 critical_exit();
429 } else
430 MPASS(TD_IS_SUSPENDED(td));
431 memcpy(pcb->pcb_vfpstate.reg, vfp->mcv_reg,
432 sizeof(pcb->pcb_vfpstate.reg));
433 pcb->pcb_vfpstate.fpscr = vfp->mcv_fpscr;
434 }
435 #endif
436
437 int
438 arm_get_vfpstate(struct thread *td, void *args)
439 {
440 int rv;
441 struct arm_get_vfpstate_args ua;
442 mcontext_vfp_t mcontext_vfp;
443
444 rv = copyin(args, &ua, sizeof(ua));
445 if (rv != 0)
446 return (rv);
447 if (ua.mc_vfp_size != sizeof(mcontext_vfp_t))
448 return (EINVAL);
449 #ifdef VFP
450 get_vfpcontext(td, &mcontext_vfp);
451 #else
452 bzero(&mcontext_vfp, sizeof(mcontext_vfp));
453 #endif
454
455 rv = copyout(&mcontext_vfp, ua.mc_vfp, sizeof(mcontext_vfp));
456 if (rv != 0)
457 return (rv);
458 return (0);
459 }
460
461 /*
462 * Get machine context.
463 */
464 int
465 get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
466 {
467 struct trapframe *tf = td->td_frame;
468 __greg_t *gr = mcp->__gregs;
469
470 if (clear_ret & GET_MC_CLEAR_RET) {
471 gr[_REG_R0] = 0;
472 gr[_REG_CPSR] = tf->tf_spsr & ~PSR_C;
473 } else {
474 gr[_REG_R0] = tf->tf_r0;
475 gr[_REG_CPSR] = tf->tf_spsr;
476 }
477 gr[_REG_R1] = tf->tf_r1;
478 gr[_REG_R2] = tf->tf_r2;
479 gr[_REG_R3] = tf->tf_r3;
480 gr[_REG_R4] = tf->tf_r4;
481 gr[_REG_R5] = tf->tf_r5;
482 gr[_REG_R6] = tf->tf_r6;
483 gr[_REG_R7] = tf->tf_r7;
484 gr[_REG_R8] = tf->tf_r8;
485 gr[_REG_R9] = tf->tf_r9;
486 gr[_REG_R10] = tf->tf_r10;
487 gr[_REG_R11] = tf->tf_r11;
488 gr[_REG_R12] = tf->tf_r12;
489 gr[_REG_SP] = tf->tf_usr_sp;
490 gr[_REG_LR] = tf->tf_usr_lr;
491 gr[_REG_PC] = tf->tf_pc;
492
493 mcp->mc_vfp_size = 0;
494 mcp->mc_vfp_ptr = NULL;
495 memset(&mcp->mc_spare, 0, sizeof(mcp->mc_spare));
496
497 return (0);
498 }
499
500 /*
501 * Set machine context.
502 *
503 * However, we don't set any but the user modifiable flags, and we won't
504 * touch the cs selector.
505 */
506 int
507 set_mcontext(struct thread *td, mcontext_t *mcp)
508 {
509 mcontext_vfp_t mc_vfp, *vfp;
510 struct trapframe *tf = td->td_frame;
511 const __greg_t *gr = mcp->__gregs;
512 int spsr;
513
514 /*
515 * Make sure the processor mode has not been tampered with and
516 * interrupts have not been disabled.
517 */
518 spsr = gr[_REG_CPSR];
519 if ((spsr & PSR_MODE) != PSR_USR32_MODE ||
520 (spsr & (PSR_I | PSR_F)) != 0)
521 return (EINVAL);
522
523 #ifdef WITNESS
524 if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_size != sizeof(mc_vfp)) {
525 printf("%s: %s: Malformed mc_vfp_size: %d (0x%08X)\n",
526 td->td_proc->p_comm, __func__,
527 mcp->mc_vfp_size, mcp->mc_vfp_size);
528 } else if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_ptr == NULL) {
529 printf("%s: %s: c_vfp_size != 0 but mc_vfp_ptr == NULL\n",
530 td->td_proc->p_comm, __func__);
531 }
532 #endif
533
534 if (mcp->mc_vfp_size == sizeof(mc_vfp) && mcp->mc_vfp_ptr != NULL) {
535 if (copyin(mcp->mc_vfp_ptr, &mc_vfp, sizeof(mc_vfp)) != 0)
536 return (EFAULT);
537 vfp = &mc_vfp;
538 } else {
539 vfp = NULL;
540 }
541
542 tf->tf_r0 = gr[_REG_R0];
543 tf->tf_r1 = gr[_REG_R1];
544 tf->tf_r2 = gr[_REG_R2];
545 tf->tf_r3 = gr[_REG_R3];
546 tf->tf_r4 = gr[_REG_R4];
547 tf->tf_r5 = gr[_REG_R5];
548 tf->tf_r6 = gr[_REG_R6];
549 tf->tf_r7 = gr[_REG_R7];
550 tf->tf_r8 = gr[_REG_R8];
551 tf->tf_r9 = gr[_REG_R9];
552 tf->tf_r10 = gr[_REG_R10];
553 tf->tf_r11 = gr[_REG_R11];
554 tf->tf_r12 = gr[_REG_R12];
555 tf->tf_usr_sp = gr[_REG_SP];
556 tf->tf_usr_lr = gr[_REG_LR];
557 tf->tf_pc = gr[_REG_PC];
558 tf->tf_spsr = gr[_REG_CPSR];
559 #ifdef VFP
560 if (vfp != NULL)
561 set_vfpcontext(td, vfp);
562 #endif
563 return (0);
564 }
565
566 void
567 sendsig(catcher, ksi, mask)
568 sig_t catcher;
569 ksiginfo_t *ksi;
570 sigset_t *mask;
571 {
572 struct thread *td;
573 struct proc *p;
574 struct trapframe *tf;
575 struct sigframe *fp, frame;
576 struct sigacts *psp;
577 struct sysentvec *sysent;
578 int onstack;
579 int sig;
580 int code;
581
582 td = curthread;
583 p = td->td_proc;
584 PROC_LOCK_ASSERT(p, MA_OWNED);
585 sig = ksi->ksi_signo;
586 code = ksi->ksi_code;
587 psp = p->p_sigacts;
588 mtx_assert(&psp->ps_mtx, MA_OWNED);
589 tf = td->td_frame;
590 onstack = sigonstack(tf->tf_usr_sp);
591
592 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
593 catcher, sig);
594
595 /* Allocate and validate space for the signal handler context. */
596 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) &&
597 SIGISMEMBER(psp->ps_sigonstack, sig)) {
598 fp = (struct sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
599 td->td_sigstk.ss_size);
600 #if defined(COMPAT_43)
601 td->td_sigstk.ss_flags |= SS_ONSTACK;
602 #endif
603 } else
604 fp = (struct sigframe *)td->td_frame->tf_usr_sp;
605
606 /* make room on the stack */
607 fp--;
608
609 /* make the stack aligned */
610 fp = (struct sigframe *)STACKALIGN(fp);
611 /* Populate the siginfo frame. */
612 get_mcontext(td, &frame.sf_uc.uc_mcontext, 0);
613 #ifdef VFP
614 get_vfpcontext(td, &frame.sf_vfp);
615 frame.sf_uc.uc_mcontext.mc_vfp_size = sizeof(fp->sf_vfp);
616 frame.sf_uc.uc_mcontext.mc_vfp_ptr = &fp->sf_vfp;
617 #else
618 frame.sf_uc.uc_mcontext.mc_vfp_size = 0;
619 frame.sf_uc.uc_mcontext.mc_vfp_ptr = NULL;
620 #endif
621 frame.sf_si = ksi->ksi_info;
622 frame.sf_uc.uc_sigmask = *mask;
623 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
624 ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
625 frame.sf_uc.uc_stack = td->td_sigstk;
626 mtx_unlock(&psp->ps_mtx);
627 PROC_UNLOCK(td->td_proc);
628
629 /* Copy the sigframe out to the user's stack. */
630 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
631 /* Process has trashed its stack. Kill it. */
632 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
633 PROC_LOCK(p);
634 sigexit(td, SIGILL);
635 }
636
637 /*
638 * Build context to run handler in. We invoke the handler
639 * directly, only returning via the trampoline. Note the
640 * trampoline version numbers are coordinated with machine-
641 * dependent code in libc.
642 */
643
644 tf->tf_r0 = sig;
645 tf->tf_r1 = (register_t)&fp->sf_si;
646 tf->tf_r2 = (register_t)&fp->sf_uc;
647
648 /* the trampoline uses r5 as the uc address */
649 tf->tf_r5 = (register_t)&fp->sf_uc;
650 tf->tf_pc = (register_t)catcher;
651 tf->tf_usr_sp = (register_t)fp;
652 sysent = p->p_sysent;
653 if (sysent->sv_sigcode_base != 0)
654 tf->tf_usr_lr = (register_t)sysent->sv_sigcode_base;
655 else
656 tf->tf_usr_lr = (register_t)(sysent->sv_psstrings -
657 *(sysent->sv_szsigcode));
658 /* Set the mode to enter in the signal handler */
659 #if __ARM_ARCH >= 7
660 if ((register_t)catcher & 1)
661 tf->tf_spsr |= PSR_T;
662 else
663 tf->tf_spsr &= ~PSR_T;
664 #endif
665
666 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_usr_lr,
667 tf->tf_usr_sp);
668
669 PROC_LOCK(p);
670 mtx_lock(&psp->ps_mtx);
671 }
672
673 int
674 sys_sigreturn(td, uap)
675 struct thread *td;
676 struct sigreturn_args /* {
677 const struct __ucontext *sigcntxp;
678 } */ *uap;
679 {
680 ucontext_t uc;
681 int error;
682
683 if (uap == NULL)
684 return (EFAULT);
685 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
686 return (EFAULT);
687 /* Restore register context. */
688 error = set_mcontext(td, &uc.uc_mcontext);
689 if (error != 0)
690 return (error);
691
692 /* Restore signal mask. */
693 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
694
695 return (EJUSTRETURN);
696 }
697
698 /*
699 * Construct a PCB from a trapframe. This is called from kdb_trap() where
700 * we want to start a backtrace from the function that caused us to enter
701 * the debugger. We have the context in the trapframe, but base the trace
702 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
703 * enough for a backtrace.
704 */
705 void
706 makectx(struct trapframe *tf, struct pcb *pcb)
707 {
708 pcb->pcb_regs.sf_r4 = tf->tf_r4;
709 pcb->pcb_regs.sf_r5 = tf->tf_r5;
710 pcb->pcb_regs.sf_r6 = tf->tf_r6;
711 pcb->pcb_regs.sf_r7 = tf->tf_r7;
712 pcb->pcb_regs.sf_r8 = tf->tf_r8;
713 pcb->pcb_regs.sf_r9 = tf->tf_r9;
714 pcb->pcb_regs.sf_r10 = tf->tf_r10;
715 pcb->pcb_regs.sf_r11 = tf->tf_r11;
716 pcb->pcb_regs.sf_r12 = tf->tf_r12;
717 pcb->pcb_regs.sf_pc = tf->tf_pc;
718 pcb->pcb_regs.sf_lr = tf->tf_usr_lr;
719 pcb->pcb_regs.sf_sp = tf->tf_usr_sp;
720 }
721
722 void
723 pcpu0_init(void)
724 {
725 #if __ARM_ARCH >= 6
726 set_curthread(&thread0);
727 #endif
728 pcpu_init(pcpup, 0, sizeof(struct pcpu));
729 PCPU_SET(curthread, &thread0);
730 }
731
732 /*
733 * Initialize proc0
734 */
735 void
736 init_proc0(vm_offset_t kstack)
737 {
738 proc_linkup0(&proc0, &thread0);
739 thread0.td_kstack = kstack;
740 thread0.td_pcb = (struct pcb *)
741 (thread0.td_kstack + kstack_pages * PAGE_SIZE) - 1;
742 thread0.td_pcb->pcb_flags = 0;
743 thread0.td_pcb->pcb_vfpcpu = -1;
744 thread0.td_pcb->pcb_vfpstate.fpscr = VFPSCR_DN;
745 thread0.td_frame = &proc0_tf;
746 pcpup->pc_curpcb = thread0.td_pcb;
747 }
748
749 #if __ARM_ARCH >= 6
750 void
751 set_stackptrs(int cpu)
752 {
753
754 set_stackptr(PSR_IRQ32_MODE,
755 irqstack + ((IRQ_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
756 set_stackptr(PSR_ABT32_MODE,
757 abtstack + ((ABT_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
758 set_stackptr(PSR_UND32_MODE,
759 undstack + ((UND_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
760 }
761 #else
762 void
763 set_stackptrs(int cpu)
764 {
765
766 set_stackptr(PSR_IRQ32_MODE,
767 irqstack.pv_va + ((IRQ_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
768 set_stackptr(PSR_ABT32_MODE,
769 abtstack.pv_va + ((ABT_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
770 set_stackptr(PSR_UND32_MODE,
771 undstack.pv_va + ((UND_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
772 }
773 #endif
774
775 static void
776 arm_kdb_init(void)
777 {
778
779 kdb_init();
780 #ifdef KDB
781 if (boothowto & RB_KDB)
782 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
783 #endif
784 }
785
786 #ifdef FDT
787 #if __ARM_ARCH < 6
788 void *
789 initarm(struct arm_boot_params *abp)
790 {
791 struct mem_region mem_regions[FDT_MEM_REGIONS];
792 struct pv_addr kernel_l1pt;
793 struct pv_addr dpcpu;
794 vm_offset_t dtbp, freemempos, l2_start, lastaddr;
795 uint64_t memsize;
796 uint32_t l2size;
797 char *env;
798 void *kmdp;
799 u_int l1pagetable;
800 int i, j, err_devmap, mem_regions_sz;
801
802 lastaddr = parse_boot_param(abp);
803 arm_physmem_kernaddr = abp->abp_physaddr;
804
805 memsize = 0;
806
807 cpuinfo_init();
808 set_cpufuncs();
809
810 /*
811 * Find the dtb passed in by the boot loader.
812 */
813 kmdp = preload_search_by_type("elf kernel");
814 if (kmdp != NULL)
815 dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
816 else
817 dtbp = (vm_offset_t)NULL;
818
819 #if defined(FDT_DTB_STATIC)
820 /*
821 * In case the device tree blob was not retrieved (from metadata) try
822 * to use the statically embedded one.
823 */
824 if (dtbp == (vm_offset_t)NULL)
825 dtbp = (vm_offset_t)&fdt_static_dtb;
826 #endif
827
828 if (OF_install(OFW_FDT, 0) == FALSE)
829 panic("Cannot install FDT");
830
831 if (OF_init((void *)dtbp) != 0)
832 panic("OF_init failed with the found device tree");
833
834 /* Grab physical memory regions information from device tree. */
835 if (fdt_get_mem_regions(mem_regions, &mem_regions_sz, &memsize) != 0)
836 panic("Cannot get physical memory regions");
837 arm_physmem_hardware_regions(mem_regions, mem_regions_sz);
838
839 /* Grab reserved memory regions information from device tree. */
840 if (fdt_get_reserved_regions(mem_regions, &mem_regions_sz) == 0)
841 arm_physmem_exclude_regions(mem_regions, mem_regions_sz,
842 EXFLAG_NODUMP | EXFLAG_NOALLOC);
843
844 /* Platform-specific initialisation */
845 platform_probe_and_attach();
846
847 pcpu0_init();
848
849 /* Do basic tuning, hz etc */
850 init_param1();
851
852 /* Calculate number of L2 tables needed for mapping vm_page_array */
853 l2size = (memsize / PAGE_SIZE) * sizeof(struct vm_page);
854 l2size = (l2size >> L1_S_SHIFT) + 1;
855
856 /*
857 * Add one table for end of kernel map, one for stacks, msgbuf and
858 * L1 and L2 tables map and one for vectors map.
859 */
860 l2size += 3;
861
862 /* Make it divisible by 4 */
863 l2size = (l2size + 3) & ~3;
864
865 freemempos = (lastaddr + PAGE_MASK) & ~PAGE_MASK;
866
867 /* Define a macro to simplify memory allocation */
868 #define valloc_pages(var, np) \
869 alloc_pages((var).pv_va, (np)); \
870 (var).pv_pa = (var).pv_va + (abp->abp_physaddr - KERNVIRTADDR);
871
872 #define alloc_pages(var, np) \
873 (var) = freemempos; \
874 freemempos += (np * PAGE_SIZE); \
875 memset((char *)(var), 0, ((np) * PAGE_SIZE));
876
877 while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
878 freemempos += PAGE_SIZE;
879 valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
880
881 for (i = 0, j = 0; i < l2size; ++i) {
882 if (!(i % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
883 valloc_pages(kernel_pt_table[i],
884 L2_TABLE_SIZE / PAGE_SIZE);
885 j = i;
886 } else {
887 kernel_pt_table[i].pv_va = kernel_pt_table[j].pv_va +
888 L2_TABLE_SIZE_REAL * (i - j);
889 kernel_pt_table[i].pv_pa =
890 kernel_pt_table[i].pv_va - KERNVIRTADDR +
891 abp->abp_physaddr;
892
893 }
894 }
895 /*
896 * Allocate a page for the system page mapped to 0x00000000
897 * or 0xffff0000. This page will just contain the system vectors
898 * and can be shared by all processes.
899 */
900 valloc_pages(systempage, 1);
901
902 /* Allocate dynamic per-cpu area. */
903 valloc_pages(dpcpu, DPCPU_SIZE / PAGE_SIZE);
904 dpcpu_init((void *)dpcpu.pv_va, 0);
905
906 /* Allocate stacks for all modes */
907 valloc_pages(irqstack, IRQ_STACK_SIZE * MAXCPU);
908 valloc_pages(abtstack, ABT_STACK_SIZE * MAXCPU);
909 valloc_pages(undstack, UND_STACK_SIZE * MAXCPU);
910 valloc_pages(kernelstack, kstack_pages * MAXCPU);
911 valloc_pages(msgbufpv, round_page(msgbufsize) / PAGE_SIZE);
912
913 /*
914 * Now we start construction of the L1 page table
915 * We start by mapping the L2 page tables into the L1.
916 * This means that we can replace L1 mappings later on if necessary
917 */
918 l1pagetable = kernel_l1pt.pv_va;
919
920 /*
921 * Try to map as much as possible of kernel text and data using
922 * 1MB section mapping and for the rest of initial kernel address
923 * space use L2 coarse tables.
924 *
925 * Link L2 tables for mapping remainder of kernel (modulo 1MB)
926 * and kernel structures
927 */
928 l2_start = lastaddr & ~(L1_S_OFFSET);
929 for (i = 0 ; i < l2size - 1; i++)
930 pmap_link_l2pt(l1pagetable, l2_start + i * L1_S_SIZE,
931 &kernel_pt_table[i]);
932
933 pmap_curmaxkvaddr = l2_start + (l2size - 1) * L1_S_SIZE;
934
935 /* Map kernel code and data */
936 pmap_map_chunk(l1pagetable, KERNVIRTADDR, abp->abp_physaddr,
937 (((uint32_t)(lastaddr) - KERNVIRTADDR) + PAGE_MASK) & ~PAGE_MASK,
938 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
939
940 /* Map L1 directory and allocated L2 page tables */
941 pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
942 L1_TABLE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
943
944 pmap_map_chunk(l1pagetable, kernel_pt_table[0].pv_va,
945 kernel_pt_table[0].pv_pa,
946 L2_TABLE_SIZE_REAL * l2size,
947 VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
948
949 /* Map allocated DPCPU, stacks and msgbuf */
950 pmap_map_chunk(l1pagetable, dpcpu.pv_va, dpcpu.pv_pa,
951 freemempos - dpcpu.pv_va,
952 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
953
954 /* Link and map the vector page */
955 pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH,
956 &kernel_pt_table[l2size - 1]);
957 pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
958 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE, PTE_CACHE);
959
960 /* Establish static device mappings. */
961 err_devmap = platform_devmap_init();
962 devmap_bootstrap(l1pagetable, NULL);
963 vm_max_kernel_address = platform_lastaddr();
964
965 cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)) | DOMAIN_CLIENT);
966 pmap_pa = kernel_l1pt.pv_pa;
967 cpu_setttb(kernel_l1pt.pv_pa);
968 cpu_tlb_flushID();
969 cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2));
970
971 /*
972 * Now that proper page tables are installed, call cpu_setup() to enable
973 * instruction and data caches and other chip-specific features.
974 */
975 cpu_setup();
976
977 /*
978 * Only after the SOC registers block is mapped we can perform device
979 * tree fixups, as they may attempt to read parameters from hardware.
980 */
981 OF_interpret("perform-fixup", 0);
982
983 platform_gpio_init();
984
985 cninit();
986
987 debugf("initarm: console initialized\n");
988 debugf(" arg1 kmdp = 0x%08x\n", (uint32_t)kmdp);
989 debugf(" boothowto = 0x%08x\n", boothowto);
990 debugf(" dtbp = 0x%08x\n", (uint32_t)dtbp);
991 arm_print_kenv();
992
993 env = kern_getenv("kernelname");
994 if (env != NULL) {
995 strlcpy(kernelname, env, sizeof(kernelname));
996 freeenv(env);
997 }
998
999 if (err_devmap != 0)
1000 printf("WARNING: could not fully configure devmap, error=%d\n",
1001 err_devmap);
1002
1003 platform_late_init();
1004
1005 /*
1006 * Pages were allocated during the secondary bootstrap for the
1007 * stacks for different CPU modes.
1008 * We must now set the r13 registers in the different CPU modes to
1009 * point to these stacks.
1010 * Since the ARM stacks use STMFD etc. we must set r13 to the top end
1011 * of the stack memory.
1012 */
1013 cpu_control(CPU_CONTROL_MMU_ENABLE, CPU_CONTROL_MMU_ENABLE);
1014
1015 set_stackptrs(0);
1016
1017 /*
1018 * We must now clean the cache again....
1019 * Cleaning may be done by reading new data to displace any
1020 * dirty data in the cache. This will have happened in cpu_setttb()
1021 * but since we are boot strapping the addresses used for the read
1022 * may have just been remapped and thus the cache could be out
1023 * of sync. A re-clean after the switch will cure this.
1024 * After booting there are no gross relocations of the kernel thus
1025 * this problem will not occur after initarm().
1026 */
1027 cpu_idcache_wbinv_all();
1028
1029 undefined_init();
1030
1031 init_proc0(kernelstack.pv_va);
1032
1033 arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
1034 pmap_bootstrap(freemempos, &kernel_l1pt);
1035 msgbufp = (void *)msgbufpv.pv_va;
1036 msgbufinit(msgbufp, msgbufsize);
1037 mutex_init();
1038
1039 /*
1040 * Exclude the kernel (and all the things we allocated which immediately
1041 * follow the kernel) from the VM allocation pool but not from crash
1042 * dumps. virtual_avail is a global variable which tracks the kva we've
1043 * "allocated" while setting up pmaps.
1044 *
1045 * Prepare the list of physical memory available to the vm subsystem.
1046 */
1047 arm_physmem_exclude_region(abp->abp_physaddr,
1048 (virtual_avail - KERNVIRTADDR), EXFLAG_NOALLOC);
1049 arm_physmem_init_kernel_globals();
1050
1051 init_param2(physmem);
1052 dbg_monitor_init();
1053 arm_kdb_init();
1054
1055 return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
1056 sizeof(struct pcb)));
1057 }
1058 #else /* __ARM_ARCH < 6 */
1059 void *
1060 initarm(struct arm_boot_params *abp)
1061 {
1062 struct mem_region mem_regions[FDT_MEM_REGIONS];
1063 vm_paddr_t lastaddr;
1064 vm_offset_t dtbp, kernelstack, dpcpu;
1065 char *env;
1066 void *kmdp;
1067 int err_devmap, mem_regions_sz;
1068 #ifdef EFI
1069 struct efi_map_header *efihdr;
1070 #endif
1071
1072 /* get last allocated physical address */
1073 arm_physmem_kernaddr = abp->abp_physaddr;
1074 lastaddr = parse_boot_param(abp) - KERNVIRTADDR + arm_physmem_kernaddr;
1075
1076 set_cpufuncs();
1077 cpuinfo_init();
1078
1079 /*
1080 * Find the dtb passed in by the boot loader.
1081 */
1082 kmdp = preload_search_by_type("elf kernel");
1083 dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
1084 #if defined(FDT_DTB_STATIC)
1085 /*
1086 * In case the device tree blob was not retrieved (from metadata) try
1087 * to use the statically embedded one.
1088 */
1089 if (dtbp == (vm_offset_t)NULL)
1090 dtbp = (vm_offset_t)&fdt_static_dtb;
1091 #endif
1092
1093 if (OF_install(OFW_FDT, 0) == FALSE)
1094 panic("Cannot install FDT");
1095
1096 if (OF_init((void *)dtbp) != 0)
1097 panic("OF_init failed with the found device tree");
1098
1099 #if defined(LINUX_BOOT_ABI)
1100 arm_parse_fdt_bootargs();
1101 #endif
1102
1103 #ifdef EFI
1104 efihdr = (struct efi_map_header *)preload_search_info(kmdp,
1105 MODINFO_METADATA | MODINFOMD_EFI_MAP);
1106 if (efihdr != NULL) {
1107 arm_add_efi_map_entries(efihdr, mem_regions, &mem_regions_sz);
1108 } else
1109 #endif
1110 {
1111 /* Grab physical memory regions information from device tree. */
1112 if (fdt_get_mem_regions(mem_regions, &mem_regions_sz,NULL) != 0)
1113 panic("Cannot get physical memory regions");
1114 }
1115 arm_physmem_hardware_regions(mem_regions, mem_regions_sz);
1116
1117 /* Grab reserved memory regions information from device tree. */
1118 if (fdt_get_reserved_regions(mem_regions, &mem_regions_sz) == 0)
1119 arm_physmem_exclude_regions(mem_regions, mem_regions_sz,
1120 EXFLAG_NODUMP | EXFLAG_NOALLOC);
1121
1122 /*
1123 * Set TEX remapping registers.
1124 * Setup kernel page tables and switch to kernel L1 page table.
1125 */
1126 pmap_set_tex();
1127 pmap_bootstrap_prepare(lastaddr);
1128
1129 /*
1130 * If EARLY_PRINTF support is enabled, we need to re-establish the
1131 * mapping after pmap_bootstrap_prepare() switches to new page tables.
1132 * Note that we can only do the remapping if the VA is outside the
1133 * kernel, now that we have real virtual (not VA=PA) mappings in effect.
1134 * Early printf does not work between the time pmap_set_tex() does
1135 * cp15_prrr_set() and this code remaps the VA.
1136 */
1137 #if defined(EARLY_PRINTF) && defined(SOCDEV_PA) && defined(SOCDEV_VA) && SOCDEV_VA < KERNBASE
1138 pmap_preboot_map_attr(SOCDEV_PA, SOCDEV_VA, 1024 * 1024,
1139 VM_PROT_READ | VM_PROT_WRITE, VM_MEMATTR_DEVICE);
1140 #endif
1141
1142 /*
1143 * Now that proper page tables are installed, call cpu_setup() to enable
1144 * instruction and data caches and other chip-specific features.
1145 */
1146 cpu_setup();
1147
1148 /* Platform-specific initialisation */
1149 platform_probe_and_attach();
1150 pcpu0_init();
1151
1152 /* Do basic tuning, hz etc */
1153 init_param1();
1154
1155 /*
1156 * Allocate a page for the system page mapped to 0xffff0000
1157 * This page will just contain the system vectors and can be
1158 * shared by all processes.
1159 */
1160 systempage = pmap_preboot_get_pages(1);
1161
1162 /* Map the vector page. */
1163 pmap_preboot_map_pages(systempage, ARM_VECTORS_HIGH, 1);
1164 if (virtual_end >= ARM_VECTORS_HIGH)
1165 virtual_end = ARM_VECTORS_HIGH - 1;
1166
1167 /* Allocate dynamic per-cpu area. */
1168 dpcpu = pmap_preboot_get_vpages(DPCPU_SIZE / PAGE_SIZE);
1169 dpcpu_init((void *)dpcpu, 0);
1170
1171 /* Allocate stacks for all modes */
1172 irqstack = pmap_preboot_get_vpages(IRQ_STACK_SIZE * MAXCPU);
1173 abtstack = pmap_preboot_get_vpages(ABT_STACK_SIZE * MAXCPU);
1174 undstack = pmap_preboot_get_vpages(UND_STACK_SIZE * MAXCPU );
1175 kernelstack = pmap_preboot_get_vpages(kstack_pages * MAXCPU);
1176
1177 /* Allocate message buffer. */
1178 msgbufp = (void *)pmap_preboot_get_vpages(
1179 round_page(msgbufsize) / PAGE_SIZE);
1180
1181 /*
1182 * Pages were allocated during the secondary bootstrap for the
1183 * stacks for different CPU modes.
1184 * We must now set the r13 registers in the different CPU modes to
1185 * point to these stacks.
1186 * Since the ARM stacks use STMFD etc. we must set r13 to the top end
1187 * of the stack memory.
1188 */
1189 set_stackptrs(0);
1190 mutex_init();
1191
1192 /* Establish static device mappings. */
1193 err_devmap = platform_devmap_init();
1194 devmap_bootstrap(0, NULL);
1195 vm_max_kernel_address = platform_lastaddr();
1196
1197 /*
1198 * Only after the SOC registers block is mapped we can perform device
1199 * tree fixups, as they may attempt to read parameters from hardware.
1200 */
1201 OF_interpret("perform-fixup", 0);
1202 platform_gpio_init();
1203 cninit();
1204
1205 /*
1206 * If we made a mapping for EARLY_PRINTF after pmap_bootstrap_prepare(),
1207 * undo it now that the normal console printf works.
1208 */
1209 #if defined(EARLY_PRINTF) && defined(SOCDEV_PA) && defined(SOCDEV_VA) && SOCDEV_VA < KERNBASE
1210 pmap_kremove(SOCDEV_VA);
1211 #endif
1212
1213 debugf("initarm: console initialized\n");
1214 debugf(" arg1 kmdp = 0x%08x\n", (uint32_t)kmdp);
1215 debugf(" boothowto = 0x%08x\n", boothowto);
1216 debugf(" dtbp = 0x%08x\n", (uint32_t)dtbp);
1217 debugf(" lastaddr1: 0x%08x\n", lastaddr);
1218 arm_print_kenv();
1219
1220 env = kern_getenv("kernelname");
1221 if (env != NULL)
1222 strlcpy(kernelname, env, sizeof(kernelname));
1223
1224 if (err_devmap != 0)
1225 printf("WARNING: could not fully configure devmap, error=%d\n",
1226 err_devmap);
1227
1228 platform_late_init();
1229
1230 /*
1231 * We must now clean the cache again....
1232 * Cleaning may be done by reading new data to displace any
1233 * dirty data in the cache. This will have happened in cpu_setttb()
1234 * but since we are boot strapping the addresses used for the read
1235 * may have just been remapped and thus the cache could be out
1236 * of sync. A re-clean after the switch will cure this.
1237 * After booting there are no gross relocations of the kernel thus
1238 * this problem will not occur after initarm().
1239 */
1240 /* Set stack for exception handlers */
1241 undefined_init();
1242 init_proc0(kernelstack);
1243 arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
1244 enable_interrupts(PSR_A);
1245 pmap_bootstrap(0);
1246
1247 /* Exclude the kernel (and all the things we allocated which immediately
1248 * follow the kernel) from the VM allocation pool but not from crash
1249 * dumps. virtual_avail is a global variable which tracks the kva we've
1250 * "allocated" while setting up pmaps.
1251 *
1252 * Prepare the list of physical memory available to the vm subsystem.
1253 */
1254 arm_physmem_exclude_region(abp->abp_physaddr,
1255 pmap_preboot_get_pages(0) - abp->abp_physaddr, EXFLAG_NOALLOC);
1256 arm_physmem_init_kernel_globals();
1257
1258 init_param2(physmem);
1259 /* Init message buffer. */
1260 msgbufinit(msgbufp, msgbufsize);
1261 dbg_monitor_init();
1262 arm_kdb_init();
1263 /* Apply possible BP hardening. */
1264 cpuinfo_init_bp_hardening();
1265 return ((void *)STACKALIGN(thread0.td_pcb));
1266
1267 }
1268
1269 #endif /* __ARM_ARCH < 6 */
1270 #endif /* FDT */
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