sys/kern/kern_fkvm.c

   1 /*-
   2  * Copyright (c) 2008 The FreeBSD Project
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 #include <sys/param.h>
  29 #include <sys/systm.h>
  30 #include <sys/kernel.h>
  31 #include <vm/vm.h>
  32 #include <vm/pmap.h>
  33 #include <vm/vm_extern.h>
  34 #include <vm/vm_map.h>
  35 #include <vm/vm_object.h>
  36 #include <vm/vm_param.h>
  37 #include <machine/_inttypes.h>
  38 #include <machine/specialreg.h>
  39
  40 struct vmspace *sp = NULL;
  41 vm_object_t obj = NULL;
  42
  43 static u_int64_t
  44 fkvm_make_vm_map(void)
  45 {
  46         int rc;
  47
  48         sp = vmspace_alloc(0, 0xffffffffffffffff);
  49         if (sp == NULL) {
  50                 printf("vmspace_alloc failed\n");
  51                 goto fail;
  52         }
  53
  54         obj = vm_object_allocate(OBJT_DEFAULT, 0xffffffffffffffff >> PAGE_SHIFT);
  55
  56         vm_object_reference(obj);
  57         rc = vm_map_insert(&sp->vm_map,
  58                            obj,
  59                            0, 0, 0xffffffffffffffff >> PAGE_SHIFT,
  60                            VM_PROT_ALL, VM_PROT_ALL,
  61                            0);
  62         if (rc != KERN_SUCCESS) {
  63                 printf("vm_map_insert failed: %d\n", rc);
  64                 vm_object_deallocate(obj);
  65                 goto fail;
  66         }
  67
  68         return vtophys(vmspace_pmap(sp)->pm_pml4);
  69
  70 fail:
  71         if (obj != NULL) {
  72                 vm_object_deallocate(obj);
  73                 obj = NULL;
  74         }
  75         if (sp != NULL) {
  76                 vmspace_free(sp);
  77                 sp = NULL;
  78         }
  79         return 0;
  80 }
  81
  82
  83 static void
  84 fkvm_load(void *unused)
  85 {
  86         u_int64_t       ncr3;
  87         u_int64_t       efer;
  88
  89         printf("fkvm_load\n");
  90
  91         /* TODO: check for the presense of extensions */
  92         efer = rdmsr(MSR_EFER);
  93         printf("EFER = %" PRIx64 "\n", efer);
  94         wrmsr(MSR_EFER, efer | EFER_SVME);
  95         efer = rdmsr(MSR_EFER);
  96         printf("new EFER = %" PRIx64 "\n", efer);
  97
  98         ncr3 = fkvm_make_vm_map();
  99         printf("ncr3: %" PRIx64 "\n", ncr3);
 100 }
 101 SYSINIT(fkvm, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, fkvm_load, NULL);
 102
 103 static void
 104 fkvm_unload(void *unused)
 105 {
 106         printf("fkvm_unload\n");
 107         /* TODO */
 108 }
 109 SYSUNINIT(fkvm, SI_SUB_PSEUDO, SI_ORDER_MIDDLE, fkvm_unload, NULL);