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


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

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    1 /*-
    2  * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
    3  * All rights reserved.
    4  *
    5  * Portions of this software were developed by SRI International and the
    6  * University of Cambridge Computer Laboratory under DARPA/AFRL contract
    7  * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
    8  *
    9  * Portions of this software were developed by the University of Cambridge
   10  * Computer Laboratory as part of the CTSRD Project, with support from the
   11  * UK Higher Education Innovation Fund (HEIF).
   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  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/11.2/sys/riscv/riscv/vm_machdep.c 301961 2016-06-16 12:05:44Z kib $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/limits.h>
   41 #include <sys/proc.h>
   42 #include <sys/sf_buf.h>
   43 #include <sys/signal.h>
   44 #include <sys/unistd.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/vm_page.h>
   48 #include <vm/vm_map.h>
   49 #include <vm/uma.h>
   50 #include <vm/uma_int.h>
   51 
   52 #include <machine/riscvreg.h>
   53 #include <machine/cpu.h>
   54 #include <machine/pcb.h>
   55 #include <machine/frame.h>
   56 
   57 /*
   58  * Finish a fork operation, with process p2 nearly set up.
   59  * Copy and update the pcb, set up the stack so that the child
   60  * ready to run and return to user mode.
   61  */
   62 void
   63 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
   64 {
   65         struct pcb *pcb2;
   66         struct trapframe *tf;
   67 
   68         if ((flags & RFPROC) == 0)
   69                 return;
   70 
   71         pcb2 = (struct pcb *)(td2->td_kstack +
   72             td2->td_kstack_pages * PAGE_SIZE) - 1;
   73 
   74         td2->td_pcb = pcb2;
   75         bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
   76 
   77         td2->td_pcb->pcb_l1addr =
   78             vtophys(vmspace_pmap(td2->td_proc->p_vmspace)->pm_l1);
   79 
   80         tf = (struct trapframe *)STACKALIGN((struct trapframe *)pcb2 - 1);
   81         bcopy(td1->td_frame, tf, sizeof(*tf));
   82 
   83         /* Clear syscall error flag */
   84         tf->tf_t[0] = 0;
   85 
   86         /* Arguments for child */
   87         tf->tf_a[0] = 0;
   88         tf->tf_a[1] = 0;
   89         tf->tf_sstatus = SSTATUS_PIE;
   90 
   91         td2->td_frame = tf;
   92 
   93         /* Set the return value registers for fork() */
   94         td2->td_pcb->pcb_s[0] = (uintptr_t)fork_return;
   95         td2->td_pcb->pcb_s[1] = (uintptr_t)td2;
   96         td2->td_pcb->pcb_ra = (uintptr_t)fork_trampoline;
   97         td2->td_pcb->pcb_sp = (uintptr_t)td2->td_frame;
   98 
   99         /* Setup to release spin count in fork_exit(). */
  100         td2->td_md.md_spinlock_count = 1;
  101         td2->td_md.md_saved_sstatus_ie = 1;
  102 }
  103 
  104 void
  105 cpu_reset(void)
  106 {
  107 
  108         printf("cpu_reset");
  109         while(1)
  110                 __asm volatile("wfi" ::: "memory");
  111 }
  112 
  113 void
  114 cpu_thread_swapin(struct thread *td)
  115 {
  116 }
  117 
  118 void
  119 cpu_thread_swapout(struct thread *td)
  120 {
  121 }
  122 
  123 void
  124 cpu_set_syscall_retval(struct thread *td, int error)
  125 {
  126         struct trapframe *frame;
  127 
  128         frame = td->td_frame;
  129 
  130         switch (error) {
  131         case 0:
  132                 frame->tf_a[0] = td->td_retval[0];
  133                 frame->tf_a[1] = td->td_retval[1];
  134                 frame->tf_t[0] = 0;             /* syscall succeeded */
  135                 break;
  136         case ERESTART:
  137                 frame->tf_sepc -= 4;            /* prev instruction */
  138                 break;
  139         case EJUSTRETURN:
  140                 break;
  141         default:
  142                 frame->tf_a[0] = error;
  143                 frame->tf_t[0] = 1;             /* syscall error */
  144                 break;
  145         }
  146 }
  147 
  148 /*
  149  * Initialize machine state, mostly pcb and trap frame for a new
  150  * thread, about to return to userspace.  Put enough state in the new
  151  * thread's PCB to get it to go back to the fork_return(), which
  152  * finalizes the thread state and handles peculiarities of the first
  153  * return to userspace for the new thread.
  154  */
  155 void
  156 cpu_copy_thread(struct thread *td, struct thread *td0)
  157 {
  158 
  159         bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
  160         bcopy(td0->td_pcb, td->td_pcb, sizeof(struct pcb));
  161 
  162         td->td_pcb->pcb_s[0] = (uintptr_t)fork_return;
  163         td->td_pcb->pcb_s[1] = (uintptr_t)td;
  164         td->td_pcb->pcb_ra = (uintptr_t)fork_trampoline;
  165         td->td_pcb->pcb_sp = (uintptr_t)td->td_frame;
  166 
  167         /* Setup to release spin count in fork_exit(). */
  168         td->td_md.md_spinlock_count = 1;
  169         td->td_md.md_saved_sstatus_ie = 1;
  170 }
  171 
  172 /*
  173  * Set that machine state for performing an upcall that starts
  174  * the entry function with the given argument.
  175  */
  176 void
  177 cpu_set_upcall(struct thread *td, void (*entry)(void *), void *arg,
  178         stack_t *stack)
  179 {
  180         struct trapframe *tf = td->td_frame;
  181 
  182         tf->tf_sp = STACKALIGN((uintptr_t)stack->ss_sp + stack->ss_size);
  183         tf->tf_sepc = (register_t)entry;
  184         tf->tf_a[0] = (register_t)arg;
  185 }
  186 
  187 int
  188 cpu_set_user_tls(struct thread *td, void *tls_base)
  189 {
  190         struct pcb *pcb;
  191 
  192         if ((uintptr_t)tls_base >= VM_MAXUSER_ADDRESS)
  193                 return (EINVAL);
  194 
  195         pcb = td->td_pcb;
  196         pcb->pcb_tp = (register_t)tls_base;
  197 
  198         return (0);
  199 }
  200 
  201 void
  202 cpu_thread_exit(struct thread *td)
  203 {
  204 }
  205 
  206 void
  207 cpu_thread_alloc(struct thread *td)
  208 {
  209 
  210         td->td_pcb = (struct pcb *)(td->td_kstack +
  211             td->td_kstack_pages * PAGE_SIZE) - 1;
  212         td->td_frame = (struct trapframe *)STACKALIGN(
  213             (caddr_t)td->td_pcb - 8 - sizeof(struct trapframe));
  214 }
  215 
  216 void
  217 cpu_thread_free(struct thread *td)
  218 {
  219 }
  220 
  221 void
  222 cpu_thread_clean(struct thread *td)
  223 {
  224 }
  225 
  226 /*
  227  * Intercept the return address from a freshly forked process that has NOT
  228  * been scheduled yet.
  229  *
  230  * This is needed to make kernel threads stay in kernel mode.
  231  */
  232 void
  233 cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg)
  234 {
  235 
  236         td->td_pcb->pcb_s[0] = (uintptr_t)func;
  237         td->td_pcb->pcb_s[1] = (uintptr_t)arg;
  238         td->td_pcb->pcb_ra = (uintptr_t)fork_trampoline;
  239         td->td_pcb->pcb_sp = (uintptr_t)td->td_frame;
  240 }
  241 
  242 void
  243 cpu_exit(struct thread *td)
  244 {
  245 }
  246 
  247 void
  248 swi_vm(void *v)
  249 {
  250 
  251         /* Nothing to do here - busdma bounce buffers are not implemented. */
  252 }

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