The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/vm_machdep.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 1982, 1986 The Regents of the University of California.
    5  * Copyright (c) 1989, 1990 William Jolitz
    6  * Copyright (c) 1994 John Dyson
    7  * All rights reserved.
    8  *
    9  * This code is derived from software contributed to Berkeley by
   10  * the Systems Programming Group of the University of Utah Computer
   11  * Science Department, and William Jolitz.
   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 the University of
   24  *      California, Berkeley and its contributors.
   25  * 4. Neither the name of the University nor the names of its contributors
   26  *    may be used to endorse or promote products derived from this software
   27  *    without specific prior written permission.
   28  *
   29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   35  * OR 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  *      from: @(#)vm_machdep.c  7.3 (Berkeley) 5/13/91
   42  *      Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
   43  */
   44 
   45 #include <sys/cdefs.h>
   46 __FBSDID("$FreeBSD$");
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/kernel.h>
   51 #include <sys/malloc.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/proc.h>
   54 #include <sys/socketvar.h>
   55 #include <sys/syscall.h>
   56 #include <sys/sysctl.h>
   57 #include <sys/sysent.h>
   58 #include <sys/unistd.h>
   59 
   60 #include <machine/cpu.h>
   61 #include <machine/frame.h>
   62 #include <machine/pcb.h>
   63 #include <machine/sysarch.h>
   64 #include <sys/lock.h>
   65 #include <sys/mutex.h>
   66 
   67 #include <vm/vm.h>
   68 #include <vm/pmap.h>
   69 #include <vm/vm_extern.h>
   70 #include <vm/vm_kern.h>
   71 #include <vm/vm_page.h>
   72 #include <vm/vm_map.h>
   73 #include <vm/vm_param.h>
   74 #include <vm/vm_pageout.h>
   75 #include <vm/uma.h>
   76 #include <vm/uma_int.h>
   77 
   78 #include <machine/md_var.h>
   79 #include <machine/vfp.h>
   80 
   81 /*
   82  * struct switchframe and trapframe must both be a multiple of 8
   83  * for correct stack alignment.
   84  */
   85 _Static_assert((sizeof(struct switchframe) % 8) == 0, "Bad alignment");
   86 _Static_assert((sizeof(struct trapframe) % 8) == 0, "Bad alignment");
   87 
   88 uint32_t initial_fpscr = VFPSCR_DN | VFPSCR_FZ;
   89 
   90 /*
   91  * Finish a fork operation, with process p2 nearly set up.
   92  * Copy and update the pcb, set up the stack so that the child
   93  * ready to run and return to user mode.
   94  */
   95 void
   96 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
   97 {
   98         struct pcb *pcb2;
   99         struct trapframe *tf;
  100         struct mdproc *mdp2;
  101 
  102         if ((flags & RFPROC) == 0)
  103                 return;
  104 
  105         /* Point the pcb to the top of the stack */
  106         pcb2 = (struct pcb *)
  107             (td2->td_kstack + td2->td_kstack_pages * PAGE_SIZE) - 1;
  108 #ifdef VFP
  109         /* Store actual state of VFP */
  110         if (curthread == td1) {
  111                 critical_enter();
  112                 vfp_store(&td1->td_pcb->pcb_vfpstate, false);
  113                 critical_exit();
  114         }
  115 #endif
  116         td2->td_pcb = pcb2;
  117 
  118         /* Clone td1's pcb */
  119         bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
  120 
  121         /* Point to mdproc and then copy over td1's contents */
  122         mdp2 = &p2->p_md;
  123         bcopy(&td1->td_proc->p_md, mdp2, sizeof(*mdp2));
  124 
  125         /* Point the frame to the stack in front of pcb and copy td1's frame */
  126         td2->td_frame = (struct trapframe *)pcb2 - 1;
  127         *td2->td_frame = *td1->td_frame;
  128 
  129         /*
  130          * Create a new fresh stack for the new process.
  131          * Copy the trap frame for the return to user mode as if from a
  132          * syscall.  This copies most of the user mode register values.
  133          */
  134         pmap_set_pcb_pagedir(vmspace_pmap(p2->p_vmspace), pcb2);
  135         pcb2->pcb_regs.sf_r4 = (register_t)fork_return;
  136         pcb2->pcb_regs.sf_r5 = (register_t)td2;
  137         pcb2->pcb_regs.sf_lr = (register_t)fork_trampoline;
  138         pcb2->pcb_regs.sf_sp = STACKALIGN(td2->td_frame);
  139         pcb2->pcb_regs.sf_tpidrurw = (register_t)get_tls();
  140 
  141         pcb2->pcb_vfpcpu = -1;
  142         pcb2->pcb_vfpstate.fpscr = initial_fpscr;
  143 
  144         tf = td2->td_frame;
  145         tf->tf_spsr &= ~PSR_C;
  146         tf->tf_r0 = 0;
  147         tf->tf_r1 = 0;
  148 
  149         /* Setup to release spin count in fork_exit(). */
  150         td2->td_md.md_spinlock_count = 1;
  151         td2->td_md.md_saved_cspr = PSR_SVC32_MODE;
  152 }
  153 
  154 void
  155 cpu_thread_swapin(struct thread *td)
  156 {
  157 }
  158 
  159 void
  160 cpu_thread_swapout(struct thread *td)
  161 {
  162 }
  163 
  164 void
  165 cpu_set_syscall_retval(struct thread *td, int error)
  166 {
  167         struct trapframe *frame;
  168 
  169         frame = td->td_frame;
  170         switch (error) {
  171         case 0:
  172                 frame->tf_r0 = td->td_retval[0];
  173                 frame->tf_r1 = td->td_retval[1];
  174                 frame->tf_spsr &= ~PSR_C;   /* carry bit */
  175                 break;
  176         case ERESTART:
  177                 /*
  178                  * Reconstruct the pc to point at the swi.
  179                  */
  180 #if __ARM_ARCH >= 7
  181                 if ((frame->tf_spsr & PSR_T) != 0)
  182                         frame->tf_pc -= THUMB_INSN_SIZE;
  183                 else
  184 #endif
  185                         frame->tf_pc -= INSN_SIZE;
  186                 break;
  187         case EJUSTRETURN:
  188                 /* nothing to do */
  189                 break;
  190         default:
  191                 frame->tf_r0 = error;
  192                 frame->tf_spsr |= PSR_C;    /* carry bit */
  193                 break;
  194         }
  195 }
  196 
  197 /*
  198  * Initialize machine state, mostly pcb and trap frame for a new
  199  * thread, about to return to userspace.  Put enough state in the new
  200  * thread's PCB to get it to go back to the fork_return(), which
  201  * finalizes the thread state and handles peculiarities of the first
  202  * return to userspace for the new thread.
  203  */
  204 void
  205 cpu_copy_thread(struct thread *td, struct thread *td0)
  206 {
  207 
  208         bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
  209         bcopy(td0->td_pcb, td->td_pcb, sizeof(struct pcb));
  210 
  211         td->td_pcb->pcb_regs.sf_r4 = (register_t)fork_return;
  212         td->td_pcb->pcb_regs.sf_r5 = (register_t)td;
  213         td->td_pcb->pcb_regs.sf_lr = (register_t)fork_trampoline;
  214         td->td_pcb->pcb_regs.sf_sp = STACKALIGN(td->td_frame);
  215 
  216         td->td_frame->tf_spsr &= ~PSR_C;
  217         td->td_frame->tf_r0 = 0;
  218 
  219         /* Setup to release spin count in fork_exit(). */
  220         td->td_md.md_spinlock_count = 1;
  221         td->td_md.md_saved_cspr = PSR_SVC32_MODE;
  222 }
  223 
  224 /*
  225  * Set that machine state for performing an upcall that starts
  226  * the entry function with the given argument.
  227  */
  228 void
  229 cpu_set_upcall(struct thread *td, void (*entry)(void *), void *arg,
  230         stack_t *stack)
  231 {
  232         struct trapframe *tf = td->td_frame;
  233 
  234         tf->tf_usr_sp = STACKALIGN((int)stack->ss_sp + stack->ss_size);
  235         tf->tf_pc = (int)entry;
  236         tf->tf_r0 = (int)arg;
  237         tf->tf_spsr = PSR_USR32_MODE;
  238 }
  239 
  240 int
  241 cpu_set_user_tls(struct thread *td, void *tls_base)
  242 {
  243 
  244         td->td_pcb->pcb_regs.sf_tpidrurw = (register_t)tls_base;
  245         if (td == curthread)
  246                 set_tls(tls_base);
  247         return (0);
  248 }
  249 
  250 void
  251 cpu_thread_exit(struct thread *td)
  252 {
  253 }
  254 
  255 void
  256 cpu_thread_alloc(struct thread *td)
  257 {
  258         td->td_pcb = (struct pcb *)(td->td_kstack + td->td_kstack_pages *
  259             PAGE_SIZE) - 1;
  260         /*
  261          * Ensure td_frame is aligned to an 8 byte boundary as it will be
  262          * placed into the stack pointer which must be 8 byte aligned in
  263          * the ARM EABI.
  264          */
  265         td->td_frame = (struct trapframe *)((caddr_t)td->td_pcb) - 1;
  266 }
  267 
  268 void
  269 cpu_thread_free(struct thread *td)
  270 {
  271 }
  272 
  273 void
  274 cpu_thread_clean(struct thread *td)
  275 {
  276 }
  277 
  278 /*
  279  * Intercept the return address from a freshly forked process that has NOT
  280  * been scheduled yet.
  281  *
  282  * This is needed to make kernel threads stay in kernel mode.
  283  */
  284 void
  285 cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg)
  286 {
  287         td->td_pcb->pcb_regs.sf_r4 = (register_t)func;  /* function */
  288         td->td_pcb->pcb_regs.sf_r5 = (register_t)arg;   /* first arg */
  289 }
  290 
  291 /*
  292  * Software interrupt handler for queued VM system processing.
  293  */
  294 void
  295 swi_vm(void *dummy)
  296 {
  297 
  298         if (busdma_swi_pending)
  299                 busdma_swi();
  300 }
  301 
  302 void
  303 cpu_exit(struct thread *td)
  304 {
  305 }
  306 
  307 bool
  308 cpu_exec_vmspace_reuse(struct proc *p __unused, vm_map_t map __unused)
  309 {
  310 
  311         return (true);
  312 }
  313 
  314 int
  315 cpu_procctl(struct thread *td __unused, int idtype __unused, id_t id __unused,
  316     int com __unused, void *data __unused)
  317 {
  318 
  319         return (EINVAL);
  320 }

Cache object: cf9a3161f464a6bf6a7740e20d2b97b6


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.