1 /*- 2 * Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com) 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 unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/kernel.h> 32 #include <sys/systm.h> 33 #include <sys/sysctl.h> 34 35 #include <vm/vm.h> 36 #include <vm/pmap.h> 37 #include <vm/vm_extern.h> 38 39 #include "npt.h" 40 41 SYSCTL_DECL(_hw_vmm); 42 SYSCTL_NODE(_hw_vmm, OID_AUTO, npt, CTLFLAG_RW, NULL, NULL); 43 44 static int npt_flags; 45 SYSCTL_INT(_hw_vmm_npt, OID_AUTO, pmap_flags, CTLFLAG_RD, 46 &npt_flags, 0, NULL); 47 48 #define NPT_IPIMASK 0xFF 49 50 /* 51 * AMD nested page table init. 52 */ 53 int 54 svm_npt_init(int ipinum) 55 { 56 int enable_superpage = 1; 57 58 npt_flags = ipinum & NPT_IPIMASK; 59 TUNABLE_INT_FETCH("hw.vmm.npt.enable_superpage", &enable_superpage); 60 if (enable_superpage) 61 npt_flags |= PMAP_PDE_SUPERPAGE; 62 63 return (0); 64 } 65 66 static int 67 npt_pinit(pmap_t pmap) 68 { 69 70 return (pmap_pinit_type(pmap, PT_RVI, npt_flags)); 71 } 72 73 struct vmspace * 74 svm_npt_alloc(vm_offset_t min, vm_offset_t max) 75 { 76 77 return (vmspace_alloc(min, max, npt_pinit)); 78 } 79 80 void 81 svm_npt_free(struct vmspace *vmspace) 82 { 83 84 vmspace_free(vmspace); 85 } 86