1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 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 | CTLFLAG_MPSAFE, NULL, 43 NULL); 44 45 static int npt_flags; 46 SYSCTL_INT(_hw_vmm_npt, OID_AUTO, pmap_flags, CTLFLAG_RD, 47 &npt_flags, 0, NULL); 48 49 #define NPT_IPIMASK 0xFF 50 51 /* 52 * AMD nested page table init. 53 */ 54 int 55 svm_npt_init(int ipinum) 56 { 57 int enable_superpage = 1; 58 59 npt_flags = ipinum & NPT_IPIMASK; 60 TUNABLE_INT_FETCH("hw.vmm.npt.enable_superpage", &enable_superpage); 61 if (enable_superpage) 62 npt_flags |= PMAP_PDE_SUPERPAGE; 63 64 return (0); 65 } 66 67 static int 68 npt_pinit(pmap_t pmap) 69 { 70 71 return (pmap_pinit_type(pmap, PT_RVI, npt_flags)); 72 } 73 74 struct vmspace * 75 svm_npt_alloc(vm_offset_t min, vm_offset_t max) 76 { 77 78 return (vmspace_alloc(min, max, npt_pinit)); 79 } 80 81 void 82 svm_npt_free(struct vmspace *vmspace) 83 { 84 85 vmspace_free(vmspace); 86 } 87