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/11.1/sys/arm/arm/machdep.c 317005 2017-04-16 07:33:47Z 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/rwlock.h>
68 #include <sys/sched.h>
69 #include <sys/syscallsubr.h>
70 #include <sys/sysent.h>
71 #include <sys/sysproto.h>
72
73 #include <vm/vm_object.h>
74 #include <vm/vm_page.h>
75 #include <vm/vm_pager.h>
76
77 #include <machine/debug_monitor.h>
78 #include <machine/machdep.h>
79 #include <machine/metadata.h>
80 #include <machine/pcb.h>
81 #include <machine/physmem.h>
82 #include <machine/platform.h>
83 #include <machine/sysarch.h>
84 #include <machine/undefined.h>
85 #include <machine/vfp.h>
86 #include <machine/vmparam.h>
87
88 #ifdef FDT
89 #include <dev/fdt/fdt_common.h>
90 #include <machine/ofw_machdep.h>
91 #endif
92
93 #ifdef DEBUG
94 #define debugf(fmt, args...) printf(fmt, ##args)
95 #else
96 #define debugf(fmt, args...)
97 #endif
98
99 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
100 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \
101 defined(COMPAT_FREEBSD9)
102 #error FreeBSD/arm doesn't provide compatibility with releases prior to 10
103 #endif
104
105 struct pcpu __pcpu[MAXCPU];
106 struct pcpu *pcpup = &__pcpu[0];
107
108 static struct trapframe proc0_tf;
109 uint32_t cpu_reset_address = 0;
110 int cold = 1;
111 vm_offset_t vector_page;
112
113 int (*_arm_memcpy)(void *, void *, int, int) = NULL;
114 int (*_arm_bzero)(void *, int, int) = NULL;
115 int _min_memcpy_size = 0;
116 int _min_bzero_size = 0;
117
118 extern int *end;
119
120 #ifdef FDT
121 vm_paddr_t pmap_pa;
122 #if __ARM_ARCH >= 6
123 vm_offset_t systempage;
124 vm_offset_t irqstack;
125 vm_offset_t undstack;
126 vm_offset_t abtstack;
127 #else
128 /*
129 * This is the number of L2 page tables required for covering max
130 * (hypothetical) memsize of 4GB and all kernel mappings (vectors, msgbuf,
131 * stacks etc.), uprounded to be divisible by 4.
132 */
133 #define KERNEL_PT_MAX 78
134 static struct pv_addr kernel_pt_table[KERNEL_PT_MAX];
135 struct pv_addr systempage;
136 static struct pv_addr msgbufpv;
137 struct pv_addr irqstack;
138 struct pv_addr undstack;
139 struct pv_addr abtstack;
140 static struct pv_addr kernelstack;
141 #endif /* __ARM_ARCH >= 6 */
142 #endif /* FDT */
143
144 #ifdef MULTIDELAY
145 static delay_func *delay_impl;
146 static void *delay_arg;
147 #endif
148
149 struct kva_md_info kmi;
150
151 /*
152 * arm32_vector_init:
153 *
154 * Initialize the vector page, and select whether or not to
155 * relocate the vectors.
156 *
157 * NOTE: We expect the vector page to be mapped at its expected
158 * destination.
159 */
160
161 extern unsigned int page0[], page0_data[];
162 void
163 arm_vector_init(vm_offset_t va, int which)
164 {
165 unsigned int *vectors = (int *) va;
166 unsigned int *vectors_data = vectors + (page0_data - page0);
167 int vec;
168
169 /*
170 * Loop through the vectors we're taking over, and copy the
171 * vector's insn and data word.
172 */
173 for (vec = 0; vec < ARM_NVEC; vec++) {
174 if ((which & (1 << vec)) == 0) {
175 /* Don't want to take over this vector. */
176 continue;
177 }
178 vectors[vec] = page0[vec];
179 vectors_data[vec] = page0_data[vec];
180 }
181
182 /* Now sync the vectors. */
183 icache_sync(va, (ARM_NVEC * 2) * sizeof(u_int));
184
185 vector_page = va;
186 #if __ARM_ARCH < 6
187 if (va == ARM_VECTORS_HIGH) {
188 /*
189 * Enable high vectors in the system control reg (SCTLR).
190 *
191 * Assume the MD caller knows what it's doing here, and really
192 * does want the vector page relocated.
193 *
194 * Note: This has to be done here (and not just in
195 * cpu_setup()) because the vector page needs to be
196 * accessible *before* cpu_startup() is called.
197 * Think ddb(9) ...
198 */
199 cpu_control(CPU_CONTROL_VECRELOC, CPU_CONTROL_VECRELOC);
200 }
201 #endif
202 }
203
204 static void
205 cpu_startup(void *dummy)
206 {
207 struct pcb *pcb = thread0.td_pcb;
208 const unsigned int mbyte = 1024 * 1024;
209 #if __ARM_ARCH < 6 && !defined(ARM_CACHE_LOCK_ENABLE)
210 vm_page_t m;
211 #endif
212
213 identify_arm_cpu();
214
215 vm_ksubmap_init(&kmi);
216
217 /*
218 * Display the RAM layout.
219 */
220 printf("real memory = %ju (%ju MB)\n",
221 (uintmax_t)arm32_ptob(realmem),
222 (uintmax_t)arm32_ptob(realmem) / mbyte);
223 printf("avail memory = %ju (%ju MB)\n",
224 (uintmax_t)arm32_ptob(vm_cnt.v_free_count),
225 (uintmax_t)arm32_ptob(vm_cnt.v_free_count) / mbyte);
226 if (bootverbose) {
227 arm_physmem_print_tables();
228 devmap_print_table();
229 }
230
231 bufinit();
232 vm_pager_bufferinit();
233 pcb->pcb_regs.sf_sp = (u_int)thread0.td_kstack +
234 USPACE_SVC_STACK_TOP;
235 pmap_set_pcb_pagedir(kernel_pmap, pcb);
236 #if __ARM_ARCH < 6
237 vector_page_setprot(VM_PROT_READ);
238 pmap_postinit();
239 #ifdef ARM_CACHE_LOCK_ENABLE
240 pmap_kenter_user(ARM_TP_ADDRESS, ARM_TP_ADDRESS);
241 arm_lock_cache_line(ARM_TP_ADDRESS);
242 #else
243 m = vm_page_alloc(NULL, 0, VM_ALLOC_NOOBJ | VM_ALLOC_ZERO);
244 pmap_kenter_user(ARM_TP_ADDRESS, VM_PAGE_TO_PHYS(m));
245 #endif
246 *(uint32_t *)ARM_RAS_START = 0;
247 *(uint32_t *)ARM_RAS_END = 0xffffffff;
248 #endif
249 }
250
251 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
252
253 /*
254 * Flush the D-cache for non-DMA I/O so that the I-cache can
255 * be made coherent later.
256 */
257 void
258 cpu_flush_dcache(void *ptr, size_t len)
259 {
260
261 dcache_wb_poc((vm_offset_t)ptr, (vm_paddr_t)vtophys(ptr), len);
262 }
263
264 /* Get current clock frequency for the given cpu id. */
265 int
266 cpu_est_clockrate(int cpu_id, uint64_t *rate)
267 {
268
269 return (ENXIO);
270 }
271
272 void
273 cpu_idle(int busy)
274 {
275
276 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d", busy, curcpu);
277 spinlock_enter();
278 #ifndef NO_EVENTTIMERS
279 if (!busy)
280 cpu_idleclock();
281 #endif
282 if (!sched_runnable())
283 cpu_sleep(0);
284 #ifndef NO_EVENTTIMERS
285 if (!busy)
286 cpu_activeclock();
287 #endif
288 spinlock_exit();
289 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d done", busy, curcpu);
290 }
291
292 int
293 cpu_idle_wakeup(int cpu)
294 {
295
296 return (0);
297 }
298
299 /*
300 * Most ARM platforms don't need to do anything special to init their clocks
301 * (they get intialized during normal device attachment), and by not defining a
302 * cpu_initclocks() function they get this generic one. Any platform that needs
303 * to do something special can just provide their own implementation, which will
304 * override this one due to the weak linkage.
305 */
306 void
307 arm_generic_initclocks(void)
308 {
309
310 #ifndef NO_EVENTTIMERS
311 #ifdef SMP
312 if (PCPU_GET(cpuid) == 0)
313 cpu_initclocks_bsp();
314 else
315 cpu_initclocks_ap();
316 #else
317 cpu_initclocks_bsp();
318 #endif
319 #endif
320 }
321 __weak_reference(arm_generic_initclocks, cpu_initclocks);
322
323 #ifdef MULTIDELAY
324 void
325 arm_set_delay(delay_func *impl, void *arg)
326 {
327
328 KASSERT(impl != NULL, ("No DELAY implementation"));
329 delay_impl = impl;
330 delay_arg = arg;
331 }
332
333 void
334 DELAY(int usec)
335 {
336
337 delay_impl(usec, delay_arg);
338 }
339 #endif
340
341 void
342 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
343 {
344 }
345
346 void
347 spinlock_enter(void)
348 {
349 struct thread *td;
350 register_t cspr;
351
352 td = curthread;
353 if (td->td_md.md_spinlock_count == 0) {
354 cspr = disable_interrupts(PSR_I | PSR_F);
355 td->td_md.md_spinlock_count = 1;
356 td->td_md.md_saved_cspr = cspr;
357 } else
358 td->td_md.md_spinlock_count++;
359 critical_enter();
360 }
361
362 void
363 spinlock_exit(void)
364 {
365 struct thread *td;
366 register_t cspr;
367
368 td = curthread;
369 critical_exit();
370 cspr = td->td_md.md_saved_cspr;
371 td->td_md.md_spinlock_count--;
372 if (td->td_md.md_spinlock_count == 0)
373 restore_interrupts(cspr);
374 }
375
376 /*
377 * Clear registers on exec
378 */
379 void
380 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
381 {
382 struct trapframe *tf = td->td_frame;
383
384 memset(tf, 0, sizeof(*tf));
385 tf->tf_usr_sp = stack;
386 tf->tf_usr_lr = imgp->entry_addr;
387 tf->tf_svc_lr = 0x77777777;
388 tf->tf_pc = imgp->entry_addr;
389 tf->tf_spsr = PSR_USR32_MODE;
390 }
391
392
393 #ifdef VFP
394 /*
395 * Get machine VFP context.
396 */
397 static void
398 get_vfpcontext(struct thread *td, mcontext_vfp_t *vfp)
399 {
400 struct pcb *curpcb;
401
402 curpcb = curthread->td_pcb;
403 critical_enter();
404
405 vfp_store(&curpcb->pcb_vfpstate, false);
406 memcpy(vfp->mcv_reg, curpcb->pcb_vfpstate.reg,
407 sizeof(vfp->mcv_reg));
408 vfp->mcv_fpscr = curpcb->pcb_vfpstate.fpscr;
409
410 critical_exit();
411 }
412
413 /*
414 * Set machine VFP context.
415 */
416 static void
417 set_vfpcontext(struct thread *td, mcontext_vfp_t *vfp)
418 {
419 struct pcb *curpcb;
420
421 curpcb = curthread->td_pcb;
422 critical_enter();
423
424 vfp_discard(td);
425 memcpy(curpcb->pcb_vfpstate.reg, vfp->mcv_reg,
426 sizeof(curpcb->pcb_vfpstate.reg));
427 curpcb->pcb_vfpstate.fpscr = vfp->mcv_fpscr;
428
429 critical_exit();
430 }
431 #endif
432
433 /*
434 * Get machine context.
435 */
436 int
437 get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
438 {
439 struct trapframe *tf = td->td_frame;
440 __greg_t *gr = mcp->__gregs;
441
442 if (clear_ret & GET_MC_CLEAR_RET) {
443 gr[_REG_R0] = 0;
444 gr[_REG_CPSR] = tf->tf_spsr & ~PSR_C;
445 } else {
446 gr[_REG_R0] = tf->tf_r0;
447 gr[_REG_CPSR] = tf->tf_spsr;
448 }
449 gr[_REG_R1] = tf->tf_r1;
450 gr[_REG_R2] = tf->tf_r2;
451 gr[_REG_R3] = tf->tf_r3;
452 gr[_REG_R4] = tf->tf_r4;
453 gr[_REG_R5] = tf->tf_r5;
454 gr[_REG_R6] = tf->tf_r6;
455 gr[_REG_R7] = tf->tf_r7;
456 gr[_REG_R8] = tf->tf_r8;
457 gr[_REG_R9] = tf->tf_r9;
458 gr[_REG_R10] = tf->tf_r10;
459 gr[_REG_R11] = tf->tf_r11;
460 gr[_REG_R12] = tf->tf_r12;
461 gr[_REG_SP] = tf->tf_usr_sp;
462 gr[_REG_LR] = tf->tf_usr_lr;
463 gr[_REG_PC] = tf->tf_pc;
464
465 mcp->mc_vfp_size = 0;
466 mcp->mc_vfp_ptr = NULL;
467 memset(&mcp->mc_spare, 0, sizeof(mcp->mc_spare));
468
469 return (0);
470 }
471
472 /*
473 * Set machine context.
474 *
475 * However, we don't set any but the user modifiable flags, and we won't
476 * touch the cs selector.
477 */
478 int
479 set_mcontext(struct thread *td, mcontext_t *mcp)
480 {
481 mcontext_vfp_t mc_vfp, *vfp;
482 struct trapframe *tf = td->td_frame;
483 const __greg_t *gr = mcp->__gregs;
484
485 #ifdef WITNESS
486 if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_size != sizeof(mc_vfp)) {
487 printf("%s: %s: Malformed mc_vfp_size: %d (0x%08X)\n",
488 td->td_proc->p_comm, __func__,
489 mcp->mc_vfp_size, mcp->mc_vfp_size);
490 } else if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_ptr == NULL) {
491 printf("%s: %s: c_vfp_size != 0 but mc_vfp_ptr == NULL\n",
492 td->td_proc->p_comm, __func__);
493 }
494 #endif
495
496 if (mcp->mc_vfp_size == sizeof(mc_vfp) && mcp->mc_vfp_ptr != NULL) {
497 if (copyin(mcp->mc_vfp_ptr, &mc_vfp, sizeof(mc_vfp)) != 0)
498 return (EFAULT);
499 vfp = &mc_vfp;
500 } else {
501 vfp = NULL;
502 }
503
504 tf->tf_r0 = gr[_REG_R0];
505 tf->tf_r1 = gr[_REG_R1];
506 tf->tf_r2 = gr[_REG_R2];
507 tf->tf_r3 = gr[_REG_R3];
508 tf->tf_r4 = gr[_REG_R4];
509 tf->tf_r5 = gr[_REG_R5];
510 tf->tf_r6 = gr[_REG_R6];
511 tf->tf_r7 = gr[_REG_R7];
512 tf->tf_r8 = gr[_REG_R8];
513 tf->tf_r9 = gr[_REG_R9];
514 tf->tf_r10 = gr[_REG_R10];
515 tf->tf_r11 = gr[_REG_R11];
516 tf->tf_r12 = gr[_REG_R12];
517 tf->tf_usr_sp = gr[_REG_SP];
518 tf->tf_usr_lr = gr[_REG_LR];
519 tf->tf_pc = gr[_REG_PC];
520 tf->tf_spsr = gr[_REG_CPSR];
521 #ifdef VFP
522 if (vfp != NULL)
523 set_vfpcontext(td, vfp);
524 #endif
525 return (0);
526 }
527
528 void
529 sendsig(catcher, ksi, mask)
530 sig_t catcher;
531 ksiginfo_t *ksi;
532 sigset_t *mask;
533 {
534 struct thread *td;
535 struct proc *p;
536 struct trapframe *tf;
537 struct sigframe *fp, frame;
538 struct sigacts *psp;
539 struct sysentvec *sysent;
540 int onstack;
541 int sig;
542 int code;
543
544 td = curthread;
545 p = td->td_proc;
546 PROC_LOCK_ASSERT(p, MA_OWNED);
547 sig = ksi->ksi_signo;
548 code = ksi->ksi_code;
549 psp = p->p_sigacts;
550 mtx_assert(&psp->ps_mtx, MA_OWNED);
551 tf = td->td_frame;
552 onstack = sigonstack(tf->tf_usr_sp);
553
554 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
555 catcher, sig);
556
557 /* Allocate and validate space for the signal handler context. */
558 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) &&
559 SIGISMEMBER(psp->ps_sigonstack, sig)) {
560 fp = (struct sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
561 td->td_sigstk.ss_size);
562 #if defined(COMPAT_43)
563 td->td_sigstk.ss_flags |= SS_ONSTACK;
564 #endif
565 } else
566 fp = (struct sigframe *)td->td_frame->tf_usr_sp;
567
568 /* make room on the stack */
569 fp--;
570
571 /* make the stack aligned */
572 fp = (struct sigframe *)STACKALIGN(fp);
573 /* Populate the siginfo frame. */
574 get_mcontext(td, &frame.sf_uc.uc_mcontext, 0);
575 #ifdef VFP
576 get_vfpcontext(td, &frame.sf_vfp);
577 frame.sf_uc.uc_mcontext.mc_vfp_size = sizeof(fp->sf_vfp);
578 frame.sf_uc.uc_mcontext.mc_vfp_ptr = &fp->sf_vfp;
579 #else
580 frame.sf_uc.uc_mcontext.mc_vfp_size = 0;
581 frame.sf_uc.uc_mcontext.mc_vfp_ptr = NULL;
582 #endif
583 frame.sf_si = ksi->ksi_info;
584 frame.sf_uc.uc_sigmask = *mask;
585 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
586 ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
587 frame.sf_uc.uc_stack = td->td_sigstk;
588 mtx_unlock(&psp->ps_mtx);
589 PROC_UNLOCK(td->td_proc);
590
591 /* Copy the sigframe out to the user's stack. */
592 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
593 /* Process has trashed its stack. Kill it. */
594 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
595 PROC_LOCK(p);
596 sigexit(td, SIGILL);
597 }
598
599 /*
600 * Build context to run handler in. We invoke the handler
601 * directly, only returning via the trampoline. Note the
602 * trampoline version numbers are coordinated with machine-
603 * dependent code in libc.
604 */
605
606 tf->tf_r0 = sig;
607 tf->tf_r1 = (register_t)&fp->sf_si;
608 tf->tf_r2 = (register_t)&fp->sf_uc;
609
610 /* the trampoline uses r5 as the uc address */
611 tf->tf_r5 = (register_t)&fp->sf_uc;
612 tf->tf_pc = (register_t)catcher;
613 tf->tf_usr_sp = (register_t)fp;
614 sysent = p->p_sysent;
615 if (sysent->sv_sigcode_base != 0)
616 tf->tf_usr_lr = (register_t)sysent->sv_sigcode_base;
617 else
618 tf->tf_usr_lr = (register_t)(sysent->sv_psstrings -
619 *(sysent->sv_szsigcode));
620 /* Set the mode to enter in the signal handler */
621 #if __ARM_ARCH >= 7
622 if ((register_t)catcher & 1)
623 tf->tf_spsr |= PSR_T;
624 else
625 tf->tf_spsr &= ~PSR_T;
626 #endif
627
628 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_usr_lr,
629 tf->tf_usr_sp);
630
631 PROC_LOCK(p);
632 mtx_lock(&psp->ps_mtx);
633 }
634
635 int
636 sys_sigreturn(td, uap)
637 struct thread *td;
638 struct sigreturn_args /* {
639 const struct __ucontext *sigcntxp;
640 } */ *uap;
641 {
642 ucontext_t uc;
643 int spsr;
644
645 if (uap == NULL)
646 return (EFAULT);
647 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
648 return (EFAULT);
649 /*
650 * Make sure the processor mode has not been tampered with and
651 * interrupts have not been disabled.
652 */
653 spsr = uc.uc_mcontext.__gregs[_REG_CPSR];
654 if ((spsr & PSR_MODE) != PSR_USR32_MODE ||
655 (spsr & (PSR_I | PSR_F)) != 0)
656 return (EINVAL);
657 /* Restore register context. */
658 set_mcontext(td, &uc.uc_mcontext);
659
660 /* Restore signal mask. */
661 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
662
663 return (EJUSTRETURN);
664 }
665
666 /*
667 * Construct a PCB from a trapframe. This is called from kdb_trap() where
668 * we want to start a backtrace from the function that caused us to enter
669 * the debugger. We have the context in the trapframe, but base the trace
670 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
671 * enough for a backtrace.
672 */
673 void
674 makectx(struct trapframe *tf, struct pcb *pcb)
675 {
676 pcb->pcb_regs.sf_r4 = tf->tf_r4;
677 pcb->pcb_regs.sf_r5 = tf->tf_r5;
678 pcb->pcb_regs.sf_r6 = tf->tf_r6;
679 pcb->pcb_regs.sf_r7 = tf->tf_r7;
680 pcb->pcb_regs.sf_r8 = tf->tf_r8;
681 pcb->pcb_regs.sf_r9 = tf->tf_r9;
682 pcb->pcb_regs.sf_r10 = tf->tf_r10;
683 pcb->pcb_regs.sf_r11 = tf->tf_r11;
684 pcb->pcb_regs.sf_r12 = tf->tf_r12;
685 pcb->pcb_regs.sf_pc = tf->tf_pc;
686 pcb->pcb_regs.sf_lr = tf->tf_usr_lr;
687 pcb->pcb_regs.sf_sp = tf->tf_usr_sp;
688 }
689
690 void
691 pcpu0_init(void)
692 {
693 #if __ARM_ARCH >= 6
694 set_curthread(&thread0);
695 #endif
696 pcpu_init(pcpup, 0, sizeof(struct pcpu));
697 PCPU_SET(curthread, &thread0);
698 }
699
700 /*
701 * Initialize proc0
702 */
703 void
704 init_proc0(vm_offset_t kstack)
705 {
706 proc_linkup0(&proc0, &thread0);
707 thread0.td_kstack = kstack;
708 thread0.td_pcb = (struct pcb *)
709 (thread0.td_kstack + kstack_pages * PAGE_SIZE) - 1;
710 thread0.td_pcb->pcb_flags = 0;
711 thread0.td_pcb->pcb_vfpcpu = -1;
712 thread0.td_pcb->pcb_vfpstate.fpscr = VFPSCR_DN;
713 thread0.td_frame = &proc0_tf;
714 pcpup->pc_curpcb = thread0.td_pcb;
715 }
716
717 #if __ARM_ARCH >= 6
718 void
719 set_stackptrs(int cpu)
720 {
721
722 set_stackptr(PSR_IRQ32_MODE,
723 irqstack + ((IRQ_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
724 set_stackptr(PSR_ABT32_MODE,
725 abtstack + ((ABT_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
726 set_stackptr(PSR_UND32_MODE,
727 undstack + ((UND_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
728 }
729 #else
730 void
731 set_stackptrs(int cpu)
732 {
733
734 set_stackptr(PSR_IRQ32_MODE,
735 irqstack.pv_va + ((IRQ_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
736 set_stackptr(PSR_ABT32_MODE,
737 abtstack.pv_va + ((ABT_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
738 set_stackptr(PSR_UND32_MODE,
739 undstack.pv_va + ((UND_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
740 }
741 #endif
742
743
744 #ifdef FDT
745 #if __ARM_ARCH < 6
746 void *
747 initarm(struct arm_boot_params *abp)
748 {
749 struct mem_region mem_regions[FDT_MEM_REGIONS];
750 struct pv_addr kernel_l1pt;
751 struct pv_addr dpcpu;
752 vm_offset_t dtbp, freemempos, l2_start, lastaddr;
753 uint64_t memsize;
754 uint32_t l2size;
755 char *env;
756 void *kmdp;
757 u_int l1pagetable;
758 int i, j, err_devmap, mem_regions_sz;
759
760 lastaddr = parse_boot_param(abp);
761 arm_physmem_kernaddr = abp->abp_physaddr;
762
763 memsize = 0;
764
765 cpuinfo_init();
766 set_cpufuncs();
767
768 /*
769 * Find the dtb passed in by the boot loader.
770 */
771 kmdp = preload_search_by_type("elf kernel");
772 if (kmdp != NULL)
773 dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
774 else
775 dtbp = (vm_offset_t)NULL;
776
777 #if defined(FDT_DTB_STATIC)
778 /*
779 * In case the device tree blob was not retrieved (from metadata) try
780 * to use the statically embedded one.
781 */
782 if (dtbp == (vm_offset_t)NULL)
783 dtbp = (vm_offset_t)&fdt_static_dtb;
784 #endif
785
786 if (OF_install(OFW_FDT, 0) == FALSE)
787 panic("Cannot install FDT");
788
789 if (OF_init((void *)dtbp) != 0)
790 panic("OF_init failed with the found device tree");
791
792 /* Grab physical memory regions information from device tree. */
793 if (fdt_get_mem_regions(mem_regions, &mem_regions_sz, &memsize) != 0)
794 panic("Cannot get physical memory regions");
795 arm_physmem_hardware_regions(mem_regions, mem_regions_sz);
796
797 /* Grab reserved memory regions information from device tree. */
798 if (fdt_get_reserved_regions(mem_regions, &mem_regions_sz) == 0)
799 arm_physmem_exclude_regions(mem_regions, mem_regions_sz,
800 EXFLAG_NODUMP | EXFLAG_NOALLOC);
801
802 /* Platform-specific initialisation */
803 platform_probe_and_attach();
804
805 pcpu0_init();
806
807 /* Do basic tuning, hz etc */
808 init_param1();
809
810 /* Calculate number of L2 tables needed for mapping vm_page_array */
811 l2size = (memsize / PAGE_SIZE) * sizeof(struct vm_page);
812 l2size = (l2size >> L1_S_SHIFT) + 1;
813
814 /*
815 * Add one table for end of kernel map, one for stacks, msgbuf and
816 * L1 and L2 tables map and one for vectors map.
817 */
818 l2size += 3;
819
820 /* Make it divisible by 4 */
821 l2size = (l2size + 3) & ~3;
822
823 freemempos = (lastaddr + PAGE_MASK) & ~PAGE_MASK;
824
825 /* Define a macro to simplify memory allocation */
826 #define valloc_pages(var, np) \
827 alloc_pages((var).pv_va, (np)); \
828 (var).pv_pa = (var).pv_va + (abp->abp_physaddr - KERNVIRTADDR);
829
830 #define alloc_pages(var, np) \
831 (var) = freemempos; \
832 freemempos += (np * PAGE_SIZE); \
833 memset((char *)(var), 0, ((np) * PAGE_SIZE));
834
835 while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
836 freemempos += PAGE_SIZE;
837 valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
838
839 for (i = 0, j = 0; i < l2size; ++i) {
840 if (!(i % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
841 valloc_pages(kernel_pt_table[i],
842 L2_TABLE_SIZE / PAGE_SIZE);
843 j = i;
844 } else {
845 kernel_pt_table[i].pv_va = kernel_pt_table[j].pv_va +
846 L2_TABLE_SIZE_REAL * (i - j);
847 kernel_pt_table[i].pv_pa =
848 kernel_pt_table[i].pv_va - KERNVIRTADDR +
849 abp->abp_physaddr;
850
851 }
852 }
853 /*
854 * Allocate a page for the system page mapped to 0x00000000
855 * or 0xffff0000. This page will just contain the system vectors
856 * and can be shared by all processes.
857 */
858 valloc_pages(systempage, 1);
859
860 /* Allocate dynamic per-cpu area. */
861 valloc_pages(dpcpu, DPCPU_SIZE / PAGE_SIZE);
862 dpcpu_init((void *)dpcpu.pv_va, 0);
863
864 /* Allocate stacks for all modes */
865 valloc_pages(irqstack, IRQ_STACK_SIZE * MAXCPU);
866 valloc_pages(abtstack, ABT_STACK_SIZE * MAXCPU);
867 valloc_pages(undstack, UND_STACK_SIZE * MAXCPU);
868 valloc_pages(kernelstack, kstack_pages * MAXCPU);
869 valloc_pages(msgbufpv, round_page(msgbufsize) / PAGE_SIZE);
870
871 /*
872 * Now we start construction of the L1 page table
873 * We start by mapping the L2 page tables into the L1.
874 * This means that we can replace L1 mappings later on if necessary
875 */
876 l1pagetable = kernel_l1pt.pv_va;
877
878 /*
879 * Try to map as much as possible of kernel text and data using
880 * 1MB section mapping and for the rest of initial kernel address
881 * space use L2 coarse tables.
882 *
883 * Link L2 tables for mapping remainder of kernel (modulo 1MB)
884 * and kernel structures
885 */
886 l2_start = lastaddr & ~(L1_S_OFFSET);
887 for (i = 0 ; i < l2size - 1; i++)
888 pmap_link_l2pt(l1pagetable, l2_start + i * L1_S_SIZE,
889 &kernel_pt_table[i]);
890
891 pmap_curmaxkvaddr = l2_start + (l2size - 1) * L1_S_SIZE;
892
893 /* Map kernel code and data */
894 pmap_map_chunk(l1pagetable, KERNVIRTADDR, abp->abp_physaddr,
895 (((uint32_t)(lastaddr) - KERNVIRTADDR) + PAGE_MASK) & ~PAGE_MASK,
896 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
897
898 /* Map L1 directory and allocated L2 page tables */
899 pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
900 L1_TABLE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
901
902 pmap_map_chunk(l1pagetable, kernel_pt_table[0].pv_va,
903 kernel_pt_table[0].pv_pa,
904 L2_TABLE_SIZE_REAL * l2size,
905 VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
906
907 /* Map allocated DPCPU, stacks and msgbuf */
908 pmap_map_chunk(l1pagetable, dpcpu.pv_va, dpcpu.pv_pa,
909 freemempos - dpcpu.pv_va,
910 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
911
912 /* Link and map the vector page */
913 pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH,
914 &kernel_pt_table[l2size - 1]);
915 pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
916 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE, PTE_CACHE);
917
918 /* Establish static device mappings. */
919 err_devmap = platform_devmap_init();
920 devmap_bootstrap(l1pagetable, NULL);
921 vm_max_kernel_address = platform_lastaddr();
922
923 cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)) | DOMAIN_CLIENT);
924 pmap_pa = kernel_l1pt.pv_pa;
925 cpu_setttb(kernel_l1pt.pv_pa);
926 cpu_tlb_flushID();
927 cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2));
928
929 /*
930 * Now that proper page tables are installed, call cpu_setup() to enable
931 * instruction and data caches and other chip-specific features.
932 */
933 cpu_setup();
934
935 /*
936 * Only after the SOC registers block is mapped we can perform device
937 * tree fixups, as they may attempt to read parameters from hardware.
938 */
939 OF_interpret("perform-fixup", 0);
940
941 platform_gpio_init();
942
943 cninit();
944
945 debugf("initarm: console initialized\n");
946 debugf(" arg1 kmdp = 0x%08x\n", (uint32_t)kmdp);
947 debugf(" boothowto = 0x%08x\n", boothowto);
948 debugf(" dtbp = 0x%08x\n", (uint32_t)dtbp);
949 arm_print_kenv();
950
951 env = kern_getenv("kernelname");
952 if (env != NULL) {
953 strlcpy(kernelname, env, sizeof(kernelname));
954 freeenv(env);
955 }
956
957 if (err_devmap != 0)
958 printf("WARNING: could not fully configure devmap, error=%d\n",
959 err_devmap);
960
961 platform_late_init();
962
963 /*
964 * Pages were allocated during the secondary bootstrap for the
965 * stacks for different CPU modes.
966 * We must now set the r13 registers in the different CPU modes to
967 * point to these stacks.
968 * Since the ARM stacks use STMFD etc. we must set r13 to the top end
969 * of the stack memory.
970 */
971 cpu_control(CPU_CONTROL_MMU_ENABLE, CPU_CONTROL_MMU_ENABLE);
972
973 set_stackptrs(0);
974
975 /*
976 * We must now clean the cache again....
977 * Cleaning may be done by reading new data to displace any
978 * dirty data in the cache. This will have happened in cpu_setttb()
979 * but since we are boot strapping the addresses used for the read
980 * may have just been remapped and thus the cache could be out
981 * of sync. A re-clean after the switch will cure this.
982 * After booting there are no gross relocations of the kernel thus
983 * this problem will not occur after initarm().
984 */
985 cpu_idcache_wbinv_all();
986
987 undefined_init();
988
989 init_proc0(kernelstack.pv_va);
990
991 arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
992 pmap_bootstrap(freemempos, &kernel_l1pt);
993 msgbufp = (void *)msgbufpv.pv_va;
994 msgbufinit(msgbufp, msgbufsize);
995 mutex_init();
996
997 /*
998 * Exclude the kernel (and all the things we allocated which immediately
999 * follow the kernel) from the VM allocation pool but not from crash
1000 * dumps. virtual_avail is a global variable which tracks the kva we've
1001 * "allocated" while setting up pmaps.
1002 *
1003 * Prepare the list of physical memory available to the vm subsystem.
1004 */
1005 arm_physmem_exclude_region(abp->abp_physaddr,
1006 (virtual_avail - KERNVIRTADDR), EXFLAG_NOALLOC);
1007 arm_physmem_init_kernel_globals();
1008
1009 init_param2(physmem);
1010 dbg_monitor_init();
1011 kdb_init();
1012
1013 return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
1014 sizeof(struct pcb)));
1015 }
1016 #else /* __ARM_ARCH < 6 */
1017 void *
1018 initarm(struct arm_boot_params *abp)
1019 {
1020 struct mem_region mem_regions[FDT_MEM_REGIONS];
1021 vm_paddr_t lastaddr;
1022 vm_offset_t dtbp, kernelstack, dpcpu;
1023 char *env;
1024 void *kmdp;
1025 int err_devmap, mem_regions_sz;
1026 #ifdef EFI
1027 struct efi_map_header *efihdr;
1028 #endif
1029
1030 /* get last allocated physical address */
1031 arm_physmem_kernaddr = abp->abp_physaddr;
1032 lastaddr = parse_boot_param(abp) - KERNVIRTADDR + arm_physmem_kernaddr;
1033
1034 set_cpufuncs();
1035 cpuinfo_init();
1036
1037 /*
1038 * Find the dtb passed in by the boot loader.
1039 */
1040 kmdp = preload_search_by_type("elf kernel");
1041 dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
1042 #if defined(FDT_DTB_STATIC)
1043 /*
1044 * In case the device tree blob was not retrieved (from metadata) try
1045 * to use the statically embedded one.
1046 */
1047 if (dtbp == (vm_offset_t)NULL)
1048 dtbp = (vm_offset_t)&fdt_static_dtb;
1049 #endif
1050
1051 if (OF_install(OFW_FDT, 0) == FALSE)
1052 panic("Cannot install FDT");
1053
1054 if (OF_init((void *)dtbp) != 0)
1055 panic("OF_init failed with the found device tree");
1056
1057 #if defined(LINUX_BOOT_ABI)
1058 arm_parse_fdt_bootargs();
1059 #endif
1060
1061 #ifdef EFI
1062 efihdr = (struct efi_map_header *)preload_search_info(kmdp,
1063 MODINFO_METADATA | MODINFOMD_EFI_MAP);
1064 if (efihdr != NULL) {
1065 arm_add_efi_map_entries(efihdr, mem_regions, &mem_regions_sz);
1066 } else
1067 #endif
1068 {
1069 /* Grab physical memory regions information from device tree. */
1070 if (fdt_get_mem_regions(mem_regions, &mem_regions_sz,NULL) != 0)
1071 panic("Cannot get physical memory regions");
1072 }
1073 arm_physmem_hardware_regions(mem_regions, mem_regions_sz);
1074
1075 /* Grab reserved memory regions information from device tree. */
1076 if (fdt_get_reserved_regions(mem_regions, &mem_regions_sz) == 0)
1077 arm_physmem_exclude_regions(mem_regions, mem_regions_sz,
1078 EXFLAG_NODUMP | EXFLAG_NOALLOC);
1079
1080 /*
1081 * Set TEX remapping registers.
1082 * Setup kernel page tables and switch to kernel L1 page table.
1083 */
1084 pmap_set_tex();
1085 pmap_bootstrap_prepare(lastaddr);
1086
1087 /*
1088 * Now that proper page tables are installed, call cpu_setup() to enable
1089 * instruction and data caches and other chip-specific features.
1090 */
1091 cpu_setup();
1092
1093 /* Platform-specific initialisation */
1094 platform_probe_and_attach();
1095 pcpu0_init();
1096
1097 /* Do basic tuning, hz etc */
1098 init_param1();
1099
1100 /*
1101 * Allocate a page for the system page mapped to 0xffff0000
1102 * This page will just contain the system vectors and can be
1103 * shared by all processes.
1104 */
1105 systempage = pmap_preboot_get_pages(1);
1106
1107 /* Map the vector page. */
1108 pmap_preboot_map_pages(systempage, ARM_VECTORS_HIGH, 1);
1109 if (virtual_end >= ARM_VECTORS_HIGH)
1110 virtual_end = ARM_VECTORS_HIGH - 1;
1111
1112 /* Allocate dynamic per-cpu area. */
1113 dpcpu = pmap_preboot_get_vpages(DPCPU_SIZE / PAGE_SIZE);
1114 dpcpu_init((void *)dpcpu, 0);
1115
1116 /* Allocate stacks for all modes */
1117 irqstack = pmap_preboot_get_vpages(IRQ_STACK_SIZE * MAXCPU);
1118 abtstack = pmap_preboot_get_vpages(ABT_STACK_SIZE * MAXCPU);
1119 undstack = pmap_preboot_get_vpages(UND_STACK_SIZE * MAXCPU );
1120 kernelstack = pmap_preboot_get_vpages(kstack_pages * MAXCPU);
1121
1122 /* Allocate message buffer. */
1123 msgbufp = (void *)pmap_preboot_get_vpages(
1124 round_page(msgbufsize) / PAGE_SIZE);
1125
1126 /*
1127 * Pages were allocated during the secondary bootstrap for the
1128 * stacks for different CPU modes.
1129 * We must now set the r13 registers in the different CPU modes to
1130 * point to these stacks.
1131 * Since the ARM stacks use STMFD etc. we must set r13 to the top end
1132 * of the stack memory.
1133 */
1134 set_stackptrs(0);
1135 mutex_init();
1136
1137 /* Establish static device mappings. */
1138 err_devmap = platform_devmap_init();
1139 devmap_bootstrap(0, NULL);
1140 vm_max_kernel_address = platform_lastaddr();
1141
1142 /*
1143 * Only after the SOC registers block is mapped we can perform device
1144 * tree fixups, as they may attempt to read parameters from hardware.
1145 */
1146 OF_interpret("perform-fixup", 0);
1147 platform_gpio_init();
1148 cninit();
1149
1150 debugf("initarm: console initialized\n");
1151 debugf(" arg1 kmdp = 0x%08x\n", (uint32_t)kmdp);
1152 debugf(" boothowto = 0x%08x\n", boothowto);
1153 debugf(" dtbp = 0x%08x\n", (uint32_t)dtbp);
1154 debugf(" lastaddr1: 0x%08x\n", lastaddr);
1155 arm_print_kenv();
1156
1157 env = kern_getenv("kernelname");
1158 if (env != NULL)
1159 strlcpy(kernelname, env, sizeof(kernelname));
1160
1161 if (err_devmap != 0)
1162 printf("WARNING: could not fully configure devmap, error=%d\n",
1163 err_devmap);
1164
1165 platform_late_init();
1166
1167 /*
1168 * We must now clean the cache again....
1169 * Cleaning may be done by reading new data to displace any
1170 * dirty data in the cache. This will have happened in cpu_setttb()
1171 * but since we are boot strapping the addresses used for the read
1172 * may have just been remapped and thus the cache could be out
1173 * of sync. A re-clean after the switch will cure this.
1174 * After booting there are no gross relocations of the kernel thus
1175 * this problem will not occur after initarm().
1176 */
1177 /* Set stack for exception handlers */
1178 undefined_init();
1179 init_proc0(kernelstack);
1180 arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
1181 enable_interrupts(PSR_A);
1182 pmap_bootstrap(0);
1183
1184 /* Exclude the kernel (and all the things we allocated which immediately
1185 * follow the kernel) from the VM allocation pool but not from crash
1186 * dumps. virtual_avail is a global variable which tracks the kva we've
1187 * "allocated" while setting up pmaps.
1188 *
1189 * Prepare the list of physical memory available to the vm subsystem.
1190 */
1191 arm_physmem_exclude_region(abp->abp_physaddr,
1192 pmap_preboot_get_pages(0) - abp->abp_physaddr, EXFLAG_NOALLOC);
1193 arm_physmem_init_kernel_globals();
1194
1195 init_param2(physmem);
1196 /* Init message buffer. */
1197 msgbufinit(msgbufp, msgbufsize);
1198 dbg_monitor_init();
1199 kdb_init();
1200 return ((void *)STACKALIGN(thread0.td_pcb));
1201
1202 }
1203
1204 #endif /* __ARM_ARCH < 6 */
1205 #endif /* FDT */
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