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/compat/cloudabi/cloudabi_vdso.c

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    1 /*-
    2  * Copyright (c) 2016 Nuxi, https://nuxi.nl/
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/11.2/sys/compat/cloudabi/cloudabi_vdso.c 307144 2016-10-12 12:17:41Z ed $");
   28 
   29 #include <sys/types.h>
   30 #include <sys/lock.h>
   31 #include <sys/sysent.h>
   32 #include <sys/rwlock.h>
   33 
   34 #include <vm/vm.h>
   35 #include <vm/pmap.h>
   36 #include <vm/vm_extern.h>
   37 #include <vm/vm_object.h>
   38 #include <vm/vm_page.h>
   39 #include <vm/vm_pager.h>
   40 
   41 #include <compat/cloudabi/cloudabi_util.h>
   42 
   43 void
   44 cloudabi_vdso_init(struct sysentvec *sv, char *begin, char *end)
   45 {
   46         vm_page_t m;
   47         vm_object_t obj;
   48         vm_offset_t addr;
   49         size_t i, pages, pages_length, vdso_length;
   50 
   51         /* Determine the number of pages needed to store the vDSO. */
   52         vdso_length = end - begin;
   53         pages = howmany(vdso_length, PAGE_SIZE);
   54         pages_length = pages * PAGE_SIZE;
   55 
   56         /* Allocate a VM object and fill it with the vDSO. */
   57         obj = vm_pager_allocate(OBJT_PHYS, 0, pages_length,
   58             VM_PROT_DEFAULT, 0, NULL);
   59         addr = kva_alloc(PAGE_SIZE);
   60         for (i = 0; i < pages; ++i) {
   61                 VM_OBJECT_WLOCK(obj);
   62                 m = vm_page_grab(obj, i, VM_ALLOC_NOBUSY | VM_ALLOC_ZERO);
   63                 m->valid = VM_PAGE_BITS_ALL;
   64                 VM_OBJECT_WUNLOCK(obj);
   65 
   66                 pmap_qenter(addr, &m, 1);
   67                 memcpy((void *)addr, begin + i * PAGE_SIZE,
   68                     MIN(vdso_length - i * PAGE_SIZE, PAGE_SIZE));
   69                 pmap_qremove(addr, 1);
   70         }
   71         kva_free(addr, PAGE_SIZE);
   72 
   73         /*
   74          * Place the vDSO at the top of the address space. The user
   75          * stack can start right below it.
   76          */
   77         sv->sv_shared_page_base = sv->sv_maxuser - pages_length;
   78         sv->sv_shared_page_len = pages_length;
   79         sv->sv_shared_page_obj = obj;
   80         sv->sv_usrstack = sv->sv_shared_page_base;
   81 }
   82 
   83 void
   84 cloudabi_vdso_destroy(struct sysentvec *sv)
   85 {
   86 
   87         vm_object_deallocate(sv->sv_shared_page_obj);
   88 }

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