The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/machdep.c

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    1 /*      $NetBSD: arm32_machdep.c,v 1.44 2004/03/24 15:34:47 atatat Exp $        */
    2 
    3 /*-
    4  * SPDX-License-Identifier: BSD-4-Clause
    5  *
    6  * Copyright (c) 2004 Olivier Houchard
    7  * Copyright (c) 1994-1998 Mark Brinicombe.
    8  * Copyright (c) 1994 Brini.
    9  * All rights reserved.
   10  *
   11  * This code is derived from software written for Brini by Mark Brinicombe
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. All advertising materials mentioning features or use of this software
   22  *    must display the following acknowledgement:
   23  *      This product includes software developed by Mark Brinicombe
   24  *      for the NetBSD Project.
   25  * 4. The name of the company nor the name of the author may be used to
   26  *    endorse or promote products derived from this software without specific
   27  *    prior written permission.
   28  *
   29  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   30  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   31  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   32  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   33  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   34  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   35  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   39  * SUCH DAMAGE.
   40  *
   41  * Machine dependent functions for kernel setup
   42  *
   43  * Created      : 17/09/94
   44  * Updated      : 18/04/01 updated for new wscons
   45  */
   46 
   47 #include "opt_ddb.h"
   48 #include "opt_kstack_pages.h"
   49 #include "opt_platform.h"
   50 #include "opt_sched.h"
   51 
   52 #include <sys/cdefs.h>
   53 __FBSDID("$FreeBSD$");
   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/ktr.h>
   66 #include <sys/linker.h>
   67 #include <sys/msgbuf.h>
   68 #include <sys/physmem.h>
   69 #include <sys/reboot.h>
   70 #include <sys/rwlock.h>
   71 #include <sys/sched.h>
   72 #include <sys/syscallsubr.h>
   73 #include <sys/sysent.h>
   74 #include <sys/sysproto.h>
   75 #include <sys/vmmeter.h>
   76 
   77 #include <vm/vm_object.h>
   78 #include <vm/vm_page.h>
   79 #include <vm/vm_pager.h>
   80 
   81 #include <machine/asm.h>
   82 #include <machine/debug_monitor.h>
   83 #include <machine/machdep.h>
   84 #include <machine/metadata.h>
   85 #include <machine/pcb.h>
   86 #include <machine/platform.h>
   87 #include <machine/sysarch.h>
   88 #include <machine/undefined.h>
   89 #include <machine/vfp.h>
   90 #include <machine/vmparam.h>
   91 
   92 #ifdef FDT
   93 #include <dev/fdt/fdt_common.h>
   94 #include <machine/ofw_machdep.h>
   95 #endif
   96 
   97 #ifdef DEBUG
   98 #define debugf(fmt, args...) printf(fmt, ##args)
   99 #else
  100 #define debugf(fmt, args...)
  101 #endif
  102 
  103 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
  104     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) || \
  105     defined(COMPAT_FREEBSD9)
  106 #error FreeBSD/arm doesn't provide compatibility with releases prior to 10
  107 #endif
  108 
  109 
  110 #ifndef _ARM_ARCH_6
  111 #error FreeBSD requires ARMv6 or later
  112 #endif
  113 
  114 struct pcpu __pcpu[MAXCPU];
  115 struct pcpu *pcpup = &__pcpu[0];
  116 
  117 static struct trapframe proc0_tf;
  118 uint32_t cpu_reset_address = 0;
  119 int cold = 1;
  120 vm_offset_t vector_page;
  121 
  122 /* The address at which the kernel was loaded.  Set early in initarm(). */
  123 vm_paddr_t arm_physmem_kernaddr;
  124 
  125 int (*_arm_memcpy)(void *, void *, int, int) = NULL;
  126 int (*_arm_bzero)(void *, int, int) = NULL;
  127 int _min_memcpy_size = 0;
  128 int _min_bzero_size = 0;
  129 
  130 extern int *end;
  131 
  132 #ifdef FDT
  133 vm_paddr_t pmap_pa;
  134 vm_offset_t systempage;
  135 vm_offset_t irqstack;
  136 vm_offset_t undstack;
  137 vm_offset_t abtstack;
  138 #endif /* FDT */
  139 
  140 #ifdef PLATFORM
  141 static delay_func *delay_impl;
  142 static void *delay_arg;
  143 #endif
  144 
  145 struct kva_md_info kmi;
  146 /*
  147  * arm32_vector_init:
  148  *
  149  *      Initialize the vector page, and select whether or not to
  150  *      relocate the vectors.
  151  *
  152  *      NOTE: We expect the vector page to be mapped at its expected
  153  *      destination.
  154  */
  155 
  156 extern unsigned int page0[], page0_data[];
  157 void
  158 arm_vector_init(vm_offset_t va, int which)
  159 {
  160         unsigned int *vectors = (int *) va;
  161         unsigned int *vectors_data = vectors + (page0_data - page0);
  162         int vec;
  163 
  164         /*
  165          * Loop through the vectors we're taking over, and copy the
  166          * vector's insn and data word.
  167          */
  168         for (vec = 0; vec < ARM_NVEC; vec++) {
  169                 if ((which & (1 << vec)) == 0) {
  170                         /* Don't want to take over this vector. */
  171                         continue;
  172                 }
  173                 vectors[vec] = page0[vec];
  174                 vectors_data[vec] = page0_data[vec];
  175         }
  176 
  177         /* Now sync the vectors. */
  178         icache_sync(va, (ARM_NVEC * 2) * sizeof(u_int));
  179 
  180         vector_page = va;
  181 }
  182 
  183 static void
  184 cpu_startup(void *dummy)
  185 {
  186         struct pcb *pcb = thread0.td_pcb;
  187         const unsigned int mbyte = 1024 * 1024;
  188 
  189         identify_arm_cpu();
  190 
  191         vm_ksubmap_init(&kmi);
  192 
  193         /*
  194          * Display the RAM layout.
  195          */
  196         printf("real memory  = %ju (%ju MB)\n",
  197             (uintmax_t)arm32_ptob(realmem),
  198             (uintmax_t)arm32_ptob(realmem) / mbyte);
  199         printf("avail memory = %ju (%ju MB)\n",
  200             (uintmax_t)arm32_ptob(vm_free_count()),
  201             (uintmax_t)arm32_ptob(vm_free_count()) / mbyte);
  202         if (bootverbose) {
  203                 physmem_print_tables();
  204                 devmap_print_table();
  205         }
  206 
  207         bufinit();
  208         vm_pager_bufferinit();
  209         pcb->pcb_regs.sf_sp = (u_int)thread0.td_kstack +
  210             USPACE_SVC_STACK_TOP;
  211         pmap_set_pcb_pagedir(kernel_pmap, pcb);
  212 }
  213 
  214 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
  215 
  216 /*
  217  * Flush the D-cache for non-DMA I/O so that the I-cache can
  218  * be made coherent later.
  219  */
  220 void
  221 cpu_flush_dcache(void *ptr, size_t len)
  222 {
  223 
  224         dcache_wb_poc((vm_offset_t)ptr, (vm_paddr_t)vtophys(ptr), len);
  225 }
  226 
  227 /* Get current clock frequency for the given cpu id. */
  228 int
  229 cpu_est_clockrate(int cpu_id, uint64_t *rate)
  230 {
  231         struct pcpu *pc;
  232 
  233         pc = pcpu_find(cpu_id);
  234         if (pc == NULL || rate == NULL)
  235                 return (EINVAL);
  236 
  237         if (pc->pc_clock == 0)
  238                 return (EOPNOTSUPP);
  239 
  240         *rate = pc->pc_clock;
  241 
  242         return (0);
  243 }
  244 
  245 void
  246 cpu_idle(int busy)
  247 {
  248 
  249         CTR2(KTR_SPARE2, "cpu_idle(%d) at %d", busy, curcpu);
  250         spinlock_enter();
  251         if (!busy)
  252                 cpu_idleclock();
  253         if (!sched_runnable())
  254                 cpu_sleep(0);
  255         if (!busy)
  256                 cpu_activeclock();
  257         spinlock_exit();
  258         CTR2(KTR_SPARE2, "cpu_idle(%d) at %d done", busy, curcpu);
  259 }
  260 
  261 int
  262 cpu_idle_wakeup(int cpu)
  263 {
  264 
  265         return (0);
  266 }
  267 
  268 void
  269 cpu_initclocks(void)
  270 {
  271 
  272 #ifdef SMP
  273         if (PCPU_GET(cpuid) == 0)
  274                 cpu_initclocks_bsp();
  275         else
  276                 cpu_initclocks_ap();
  277 #else
  278         cpu_initclocks_bsp();
  279 #endif
  280 }
  281 
  282 #ifdef PLATFORM
  283 void
  284 arm_set_delay(delay_func *impl, void *arg)
  285 {
  286 
  287         KASSERT(impl != NULL, ("No DELAY implementation"));
  288         delay_impl = impl;
  289         delay_arg = arg;
  290 }
  291 
  292 void
  293 DELAY(int usec)
  294 {
  295 
  296         TSENTER();
  297         delay_impl(usec, delay_arg);
  298         TSEXIT();
  299 }
  300 #endif
  301 
  302 void
  303 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
  304 {
  305 
  306         pcpu->pc_mpidr = 0xffffffff;
  307 }
  308 
  309 void
  310 spinlock_enter(void)
  311 {
  312         struct thread *td;
  313         register_t cspr;
  314 
  315         td = curthread;
  316         if (td->td_md.md_spinlock_count == 0) {
  317                 cspr = disable_interrupts(PSR_I | PSR_F);
  318                 td->td_md.md_spinlock_count = 1;
  319                 td->td_md.md_saved_cspr = cspr;
  320                 critical_enter();
  321         } else
  322                 td->td_md.md_spinlock_count++;
  323 }
  324 
  325 void
  326 spinlock_exit(void)
  327 {
  328         struct thread *td;
  329         register_t cspr;
  330 
  331         td = curthread;
  332         cspr = td->td_md.md_saved_cspr;
  333         td->td_md.md_spinlock_count--;
  334         if (td->td_md.md_spinlock_count == 0) {
  335                 critical_exit();
  336                 restore_interrupts(cspr);
  337         }
  338 }
  339 
  340 /*
  341  * Clear registers on exec
  342  */
  343 void
  344 exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack)
  345 {
  346         struct trapframe *tf = td->td_frame;
  347 
  348         memset(tf, 0, sizeof(*tf));
  349         tf->tf_usr_sp = stack;
  350         tf->tf_usr_lr = imgp->entry_addr;
  351         tf->tf_svc_lr = 0x77777777;
  352         tf->tf_pc = imgp->entry_addr;
  353         tf->tf_spsr = PSR_USR32_MODE;
  354 }
  355 
  356 #ifdef VFP
  357 /*
  358  * Get machine VFP context.
  359  */
  360 void
  361 get_vfpcontext(struct thread *td, mcontext_vfp_t *vfp)
  362 {
  363         struct pcb *pcb;
  364 
  365         pcb = td->td_pcb;
  366         if (td == curthread) {
  367                 critical_enter();
  368                 vfp_store(&pcb->pcb_vfpstate, false);
  369                 critical_exit();
  370         } else
  371                 MPASS(TD_IS_SUSPENDED(td));
  372         memcpy(vfp->mcv_reg, pcb->pcb_vfpstate.reg,
  373             sizeof(vfp->mcv_reg));
  374         vfp->mcv_fpscr = pcb->pcb_vfpstate.fpscr;
  375 }
  376 
  377 /*
  378  * Set machine VFP context.
  379  */
  380 void
  381 set_vfpcontext(struct thread *td, mcontext_vfp_t *vfp)
  382 {
  383         struct pcb *pcb;
  384 
  385         pcb = td->td_pcb;
  386         if (td == curthread) {
  387                 critical_enter();
  388                 vfp_discard(td);
  389                 critical_exit();
  390         } else
  391                 MPASS(TD_IS_SUSPENDED(td));
  392         memcpy(pcb->pcb_vfpstate.reg, vfp->mcv_reg,
  393             sizeof(pcb->pcb_vfpstate.reg));
  394         pcb->pcb_vfpstate.fpscr = vfp->mcv_fpscr;
  395 }
  396 #endif
  397 
  398 int
  399 arm_get_vfpstate(struct thread *td, void *args)
  400 {
  401         int rv;
  402         struct arm_get_vfpstate_args ua;
  403         mcontext_vfp_t  mcontext_vfp;
  404 
  405         rv = copyin(args, &ua, sizeof(ua));
  406         if (rv != 0)
  407                 return (rv);
  408         if (ua.mc_vfp_size != sizeof(mcontext_vfp_t))
  409                 return (EINVAL);
  410 #ifdef VFP
  411         get_vfpcontext(td, &mcontext_vfp);
  412 #else
  413         bzero(&mcontext_vfp, sizeof(mcontext_vfp));
  414 #endif
  415 
  416         rv = copyout(&mcontext_vfp, ua.mc_vfp,  sizeof(mcontext_vfp));
  417         if (rv != 0)
  418                 return (rv);
  419         return (0);
  420 }
  421 
  422 /*
  423  * Get machine context.
  424  */
  425 int
  426 get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
  427 {
  428         struct trapframe *tf = td->td_frame;
  429         __greg_t *gr = mcp->__gregs;
  430 
  431         if (clear_ret & GET_MC_CLEAR_RET) {
  432                 gr[_REG_R0] = 0;
  433                 gr[_REG_CPSR] = tf->tf_spsr & ~PSR_C;
  434         } else {
  435                 gr[_REG_R0]   = tf->tf_r0;
  436                 gr[_REG_CPSR] = tf->tf_spsr;
  437         }
  438         gr[_REG_R1]   = tf->tf_r1;
  439         gr[_REG_R2]   = tf->tf_r2;
  440         gr[_REG_R3]   = tf->tf_r3;
  441         gr[_REG_R4]   = tf->tf_r4;
  442         gr[_REG_R5]   = tf->tf_r5;
  443         gr[_REG_R6]   = tf->tf_r6;
  444         gr[_REG_R7]   = tf->tf_r7;
  445         gr[_REG_R8]   = tf->tf_r8;
  446         gr[_REG_R9]   = tf->tf_r9;
  447         gr[_REG_R10]  = tf->tf_r10;
  448         gr[_REG_R11]  = tf->tf_r11;
  449         gr[_REG_R12]  = tf->tf_r12;
  450         gr[_REG_SP]   = tf->tf_usr_sp;
  451         gr[_REG_LR]   = tf->tf_usr_lr;
  452         gr[_REG_PC]   = tf->tf_pc;
  453 
  454         mcp->mc_vfp_size = 0;
  455         mcp->mc_vfp_ptr = NULL;
  456         memset(&mcp->mc_spare, 0, sizeof(mcp->mc_spare));
  457 
  458         return (0);
  459 }
  460 
  461 /*
  462  * Set machine context.
  463  *
  464  * However, we don't set any but the user modifiable flags, and we won't
  465  * touch the cs selector.
  466  */
  467 int
  468 set_mcontext(struct thread *td, mcontext_t *mcp)
  469 {
  470         mcontext_vfp_t mc_vfp, *vfp;
  471         struct trapframe *tf = td->td_frame;
  472         const __greg_t *gr = mcp->__gregs;
  473         int spsr;
  474 
  475         /*
  476          * Make sure the processor mode has not been tampered with and
  477          * interrupts have not been disabled.
  478          */
  479         spsr = gr[_REG_CPSR];
  480         if ((spsr & PSR_MODE) != PSR_USR32_MODE ||
  481             (spsr & (PSR_I | PSR_F)) != 0)
  482                 return (EINVAL);
  483 
  484 #ifdef WITNESS
  485         if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_size != sizeof(mc_vfp)) {
  486                 printf("%s: %s: Malformed mc_vfp_size: %d (0x%08X)\n",
  487                     td->td_proc->p_comm, __func__,
  488                     mcp->mc_vfp_size, mcp->mc_vfp_size);
  489         } else if (mcp->mc_vfp_size != 0 && mcp->mc_vfp_ptr == NULL) {
  490                 printf("%s: %s: c_vfp_size != 0 but mc_vfp_ptr == NULL\n",
  491                     td->td_proc->p_comm, __func__);
  492         }
  493 #endif
  494 
  495         if (mcp->mc_vfp_size == sizeof(mc_vfp) && mcp->mc_vfp_ptr != NULL) {
  496                 if (copyin(mcp->mc_vfp_ptr, &mc_vfp, sizeof(mc_vfp)) != 0)
  497                         return (EFAULT);
  498                 vfp = &mc_vfp;
  499         } else {
  500                 vfp = NULL;
  501         }
  502 
  503         tf->tf_r0 = gr[_REG_R0];
  504         tf->tf_r1 = gr[_REG_R1];
  505         tf->tf_r2 = gr[_REG_R2];
  506         tf->tf_r3 = gr[_REG_R3];
  507         tf->tf_r4 = gr[_REG_R4];
  508         tf->tf_r5 = gr[_REG_R5];
  509         tf->tf_r6 = gr[_REG_R6];
  510         tf->tf_r7 = gr[_REG_R7];
  511         tf->tf_r8 = gr[_REG_R8];
  512         tf->tf_r9 = gr[_REG_R9];
  513         tf->tf_r10 = gr[_REG_R10];
  514         tf->tf_r11 = gr[_REG_R11];
  515         tf->tf_r12 = gr[_REG_R12];
  516         tf->tf_usr_sp = gr[_REG_SP];
  517         tf->tf_usr_lr = gr[_REG_LR];
  518         tf->tf_pc = gr[_REG_PC];
  519         tf->tf_spsr = gr[_REG_CPSR];
  520 #ifdef VFP
  521         if (vfp != NULL)
  522                 set_vfpcontext(td, vfp);
  523 #endif
  524         return (0);
  525 }
  526 
  527 void
  528 sendsig(catcher, ksi, mask)
  529         sig_t catcher;
  530         ksiginfo_t *ksi;
  531         sigset_t *mask;
  532 {
  533         struct thread *td;
  534         struct proc *p;
  535         struct trapframe *tf;
  536         struct sigframe *fp, frame;
  537         struct sigacts *psp;
  538         struct sysentvec *sysent;
  539         int onstack;
  540         int sig;
  541         int code;
  542 
  543         td = curthread;
  544         p = td->td_proc;
  545         PROC_LOCK_ASSERT(p, MA_OWNED);
  546         sig = ksi->ksi_signo;
  547         code = ksi->ksi_code;
  548         psp = p->p_sigacts;
  549         mtx_assert(&psp->ps_mtx, MA_OWNED);
  550         tf = td->td_frame;
  551         onstack = sigonstack(tf->tf_usr_sp);
  552 
  553         CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
  554             catcher, sig);
  555 
  556         /* Allocate and validate space for the signal handler context. */
  557         if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) &&
  558             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  559                 fp = (struct sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  560                     td->td_sigstk.ss_size);
  561 #if defined(COMPAT_43)
  562                 td->td_sigstk.ss_flags |= SS_ONSTACK;
  563 #endif
  564         } else
  565                 fp = (struct sigframe *)td->td_frame->tf_usr_sp;
  566 
  567         /* make room on the stack */
  568         fp--;
  569 
  570         /* make the stack aligned */
  571         fp = (struct sigframe *)STACKALIGN(fp);
  572         /* Populate the siginfo frame. */
  573         bzero(&frame, sizeof(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 = td->td_sigstk;
  586         frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ?
  587             (onstack ? SS_ONSTACK : 0) : SS_DISABLE;
  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 error;
  644 
  645         if (uap == NULL)
  646                 return (EFAULT);
  647         if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
  648                 return (EFAULT);
  649         /* Restore register context. */
  650         error = set_mcontext(td, &uc.uc_mcontext);
  651         if (error != 0)
  652                 return (error);
  653 
  654         /* Restore signal mask. */
  655         kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
  656 
  657         return (EJUSTRETURN);
  658 }
  659 
  660 /*
  661  * Construct a PCB from a trapframe. This is called from kdb_trap() where
  662  * we want to start a backtrace from the function that caused us to enter
  663  * the debugger. We have the context in the trapframe, but base the trace
  664  * on the PCB. The PCB doesn't have to be perfect, as long as it contains
  665  * enough for a backtrace.
  666  */
  667 void
  668 makectx(struct trapframe *tf, struct pcb *pcb)
  669 {
  670         pcb->pcb_regs.sf_r4 = tf->tf_r4;
  671         pcb->pcb_regs.sf_r5 = tf->tf_r5;
  672         pcb->pcb_regs.sf_r6 = tf->tf_r6;
  673         pcb->pcb_regs.sf_r7 = tf->tf_r7;
  674         pcb->pcb_regs.sf_r8 = tf->tf_r8;
  675         pcb->pcb_regs.sf_r9 = tf->tf_r9;
  676         pcb->pcb_regs.sf_r10 = tf->tf_r10;
  677         pcb->pcb_regs.sf_r11 = tf->tf_r11;
  678         pcb->pcb_regs.sf_r12 = tf->tf_r12;
  679         pcb->pcb_regs.sf_pc = tf->tf_pc;
  680         pcb->pcb_regs.sf_lr = tf->tf_usr_lr;
  681         pcb->pcb_regs.sf_sp = tf->tf_usr_sp;
  682 }
  683 
  684 void
  685 pcpu0_init(void)
  686 {
  687         set_curthread(&thread0);
  688         pcpu_init(pcpup, 0, sizeof(struct pcpu));
  689         pcpup->pc_mpidr = cp15_mpidr_get() & 0xFFFFFF;
  690         PCPU_SET(curthread, &thread0);
  691 }
  692 
  693 /*
  694  * Initialize proc0
  695  */
  696 void
  697 init_proc0(vm_offset_t kstack)
  698 {
  699         proc_linkup0(&proc0, &thread0);
  700         thread0.td_kstack = kstack;
  701         thread0.td_kstack_pages = kstack_pages;
  702         thread0.td_pcb = (struct pcb *)(thread0.td_kstack +
  703             thread0.td_kstack_pages * PAGE_SIZE) - 1;
  704         thread0.td_pcb->pcb_flags = 0;
  705         thread0.td_pcb->pcb_vfpcpu = -1;
  706         thread0.td_pcb->pcb_vfpstate.fpscr = VFPSCR_DN;
  707         thread0.td_frame = &proc0_tf;
  708         pcpup->pc_curpcb = thread0.td_pcb;
  709 }
  710 
  711 void
  712 set_stackptrs(int cpu)
  713 {
  714 
  715         set_stackptr(PSR_IRQ32_MODE,
  716             irqstack + ((IRQ_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
  717         set_stackptr(PSR_ABT32_MODE,
  718             abtstack + ((ABT_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
  719         set_stackptr(PSR_UND32_MODE,
  720             undstack + ((UND_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
  721 }
  722 
  723 static void
  724 arm_kdb_init(void)
  725 {
  726 
  727         kdb_init();
  728 #ifdef KDB
  729         if (boothowto & RB_KDB)
  730                 kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  731 #endif
  732 }
  733 
  734 #ifdef FDT
  735 void *
  736 initarm(struct arm_boot_params *abp)
  737 {
  738         struct mem_region mem_regions[FDT_MEM_REGIONS];
  739         vm_paddr_t lastaddr;
  740         vm_offset_t dtbp, kernelstack, dpcpu;
  741         char *env;
  742         void *kmdp;
  743         int err_devmap, mem_regions_sz;
  744         phandle_t root;
  745         char dts_version[255];
  746 #ifdef EFI
  747         struct efi_map_header *efihdr;
  748 #endif
  749 
  750         /* get last allocated physical address */
  751         arm_physmem_kernaddr = abp->abp_physaddr;
  752         lastaddr = parse_boot_param(abp) - KERNVIRTADDR + arm_physmem_kernaddr;
  753 
  754         set_cpufuncs();
  755         cpuinfo_init();
  756 
  757         /*
  758          * Find the dtb passed in by the boot loader.
  759          */
  760         kmdp = preload_search_by_type("elf kernel");
  761         dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
  762 #if defined(FDT_DTB_STATIC)
  763         /*
  764          * In case the device tree blob was not retrieved (from metadata) try
  765          * to use the statically embedded one.
  766          */
  767         if (dtbp == (vm_offset_t)NULL)
  768                 dtbp = (vm_offset_t)&fdt_static_dtb;
  769 #endif
  770 
  771         if (OF_install(OFW_FDT, 0) == FALSE)
  772                 panic("Cannot install FDT");
  773 
  774         if (OF_init((void *)dtbp) != 0)
  775                 panic("OF_init failed with the found device tree");
  776 
  777 #if defined(LINUX_BOOT_ABI)
  778         arm_parse_fdt_bootargs();
  779 #endif
  780 
  781 #ifdef EFI
  782         efihdr = (struct efi_map_header *)preload_search_info(kmdp,
  783             MODINFO_METADATA | MODINFOMD_EFI_MAP);
  784         if (efihdr != NULL) {
  785                 arm_add_efi_map_entries(efihdr, mem_regions, &mem_regions_sz);
  786         } else
  787 #endif
  788         {
  789                 /* Grab physical memory regions information from device tree. */
  790                 if (fdt_get_mem_regions(mem_regions, &mem_regions_sz,NULL) != 0)
  791                         panic("Cannot get physical memory regions");
  792         }
  793         physmem_hardware_regions(mem_regions, mem_regions_sz);
  794 
  795         /* Grab reserved memory regions information from device tree. */
  796         if (fdt_get_reserved_regions(mem_regions, &mem_regions_sz) == 0)
  797                 physmem_exclude_regions(mem_regions, mem_regions_sz,
  798                     EXFLAG_NODUMP | EXFLAG_NOALLOC);
  799 
  800         /*
  801          * Set TEX remapping registers.
  802          * Setup kernel page tables and switch to kernel L1 page table.
  803          */
  804         pmap_set_tex();
  805         pmap_bootstrap_prepare(lastaddr);
  806 
  807         /*
  808          * If EARLY_PRINTF support is enabled, we need to re-establish the
  809          * mapping after pmap_bootstrap_prepare() switches to new page tables.
  810          * Note that we can only do the remapping if the VA is outside the
  811          * kernel, now that we have real virtual (not VA=PA) mappings in effect.
  812          * Early printf does not work between the time pmap_set_tex() does
  813          * cp15_prrr_set() and this code remaps the VA.
  814          */
  815 #if defined(EARLY_PRINTF) && defined(SOCDEV_PA) && defined(SOCDEV_VA) && SOCDEV_VA < KERNBASE
  816         pmap_preboot_map_attr(SOCDEV_PA, SOCDEV_VA, 1024 * 1024, 
  817             VM_PROT_READ | VM_PROT_WRITE, VM_MEMATTR_DEVICE);
  818 #endif
  819 
  820         /*
  821          * Now that proper page tables are installed, call cpu_setup() to enable
  822          * instruction and data caches and other chip-specific features.
  823          */
  824         cpu_setup();
  825 
  826         /* Platform-specific initialisation */
  827         platform_probe_and_attach();
  828         pcpu0_init();
  829 
  830         /* Do basic tuning, hz etc */
  831         init_param1();
  832 
  833         /*
  834          * Allocate a page for the system page mapped to 0xffff0000
  835          * This page will just contain the system vectors and can be
  836          * shared by all processes.
  837          */
  838         systempage = pmap_preboot_get_pages(1);
  839 
  840         /* Map the vector page. */
  841         pmap_preboot_map_pages(systempage, ARM_VECTORS_HIGH,  1);
  842         if (virtual_end >= ARM_VECTORS_HIGH)
  843                 virtual_end = ARM_VECTORS_HIGH - 1;
  844 
  845         /* Allocate dynamic per-cpu area. */
  846         dpcpu = pmap_preboot_get_vpages(DPCPU_SIZE / PAGE_SIZE);
  847         dpcpu_init((void *)dpcpu, 0);
  848 
  849         /* Allocate stacks for all modes */
  850         irqstack    = pmap_preboot_get_vpages(IRQ_STACK_SIZE * MAXCPU);
  851         abtstack    = pmap_preboot_get_vpages(ABT_STACK_SIZE * MAXCPU);
  852         undstack    = pmap_preboot_get_vpages(UND_STACK_SIZE * MAXCPU );
  853         kernelstack = pmap_preboot_get_vpages(kstack_pages);
  854 
  855         /* Allocate message buffer. */
  856         msgbufp = (void *)pmap_preboot_get_vpages(
  857             round_page(msgbufsize) / PAGE_SIZE);
  858 
  859         /*
  860          * Pages were allocated during the secondary bootstrap for the
  861          * stacks for different CPU modes.
  862          * We must now set the r13 registers in the different CPU modes to
  863          * point to these stacks.
  864          * Since the ARM stacks use STMFD etc. we must set r13 to the top end
  865          * of the stack memory.
  866          */
  867         set_stackptrs(0);
  868         mutex_init();
  869 
  870         /* Establish static device mappings. */
  871         err_devmap = platform_devmap_init();
  872         devmap_bootstrap(0, NULL);
  873         vm_max_kernel_address = platform_lastaddr();
  874 
  875         /*
  876          * Only after the SOC registers block is mapped we can perform device
  877          * tree fixups, as they may attempt to read parameters from hardware.
  878          */
  879         OF_interpret("perform-fixup", 0);
  880         platform_gpio_init();
  881         cninit();
  882 
  883         /*
  884          * If we made a mapping for EARLY_PRINTF after pmap_bootstrap_prepare(),
  885          * undo it now that the normal console printf works.
  886          */
  887 #if defined(EARLY_PRINTF) && defined(SOCDEV_PA) && defined(SOCDEV_VA) && SOCDEV_VA < KERNBASE
  888         pmap_kremove(SOCDEV_VA);
  889 #endif
  890 
  891         debugf("initarm: console initialized\n");
  892         debugf(" arg1 kmdp = 0x%08x\n", (uint32_t)kmdp);
  893         debugf(" boothowto = 0x%08x\n", boothowto);
  894         debugf(" dtbp = 0x%08x\n", (uint32_t)dtbp);
  895         debugf(" lastaddr1: 0x%08x\n", lastaddr);
  896         arm_print_kenv();
  897 
  898         env = kern_getenv("kernelname");
  899         if (env != NULL)
  900                 strlcpy(kernelname, env, sizeof(kernelname));
  901 
  902         if (err_devmap != 0)
  903                 printf("WARNING: could not fully configure devmap, error=%d\n",
  904                     err_devmap);
  905 
  906         platform_late_init();
  907 
  908         root = OF_finddevice("/");
  909         if (OF_getprop(root, "freebsd,dts-version", dts_version, sizeof(dts_version)) > 0) {
  910                 if (strcmp(LINUX_DTS_VERSION, dts_version) != 0)
  911                         printf("WARNING: DTB version is %s while kernel expects %s, "
  912                             "please update the DTB in the ESP\n",
  913                             dts_version,
  914                             LINUX_DTS_VERSION);
  915         } else {
  916                 printf("WARNING: Cannot find freebsd,dts-version property, "
  917                     "cannot check DTB compliance\n");
  918         }
  919 
  920         /*
  921          * We must now clean the cache again....
  922          * Cleaning may be done by reading new data to displace any
  923          * dirty data in the cache. This will have happened in cpu_setttb()
  924          * but since we are boot strapping the addresses used for the read
  925          * may have just been remapped and thus the cache could be out
  926          * of sync. A re-clean after the switch will cure this.
  927          * After booting there are no gross relocations of the kernel thus
  928          * this problem will not occur after initarm().
  929          */
  930         /* Set stack for exception handlers */
  931         undefined_init();
  932         init_proc0(kernelstack);
  933         arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
  934         enable_interrupts(PSR_A);
  935         pmap_bootstrap(0);
  936 
  937         /* Exclude the kernel (and all the things we allocated which immediately
  938          * follow the kernel) from the VM allocation pool but not from crash
  939          * dumps.  virtual_avail is a global variable which tracks the kva we've
  940          * "allocated" while setting up pmaps.
  941          *
  942          * Prepare the list of physical memory available to the vm subsystem.
  943          */
  944         physmem_exclude_region(abp->abp_physaddr,
  945                 pmap_preboot_get_pages(0) - abp->abp_physaddr, EXFLAG_NOALLOC);
  946         physmem_init_kernel_globals();
  947 
  948         init_param2(physmem);
  949         /* Init message buffer. */
  950         msgbufinit(msgbufp, msgbufsize);
  951         dbg_monitor_init();
  952         arm_kdb_init();
  953         /* Apply possible BP hardening. */
  954         cpuinfo_init_bp_hardening();
  955         return ((void *)STACKALIGN(thread0.td_pcb));
  956 
  957 }
  958 #endif /* FDT */

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