1 /* $NetBSD: xen_pmap.c,v 1.2 2011/02/01 21:18:56 chuck Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Manuel Bouyer. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following 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 28 /* 29 * Copyright (c) 2006 Mathieu Ropert <mro@adviseo.fr> 30 * 31 * Permission to use, copy, modify, and distribute this software for any 32 * purpose with or without fee is hereby granted, provided that the above 33 * copyright notice and this permission notice appear in all copies. 34 * 35 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 36 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 37 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 38 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 39 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 40 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 41 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 42 */ 43 44 /* 45 * Copyright (c) 1997 Charles D. Cranor and Washington University. 46 * All rights reserved. 47 * 48 * Redistribution and use in source and binary forms, with or without 49 * modification, are permitted provided that the following conditions 50 * are met: 51 * 1. Redistributions of source code must retain the above copyright 52 * notice, this list of conditions and the following disclaimer. 53 * 2. Redistributions in binary form must reproduce the above copyright 54 * notice, this list of conditions and the following disclaimer in the 55 * documentation and/or other materials provided with the distribution. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 58 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 59 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 60 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 61 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 62 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 63 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 64 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 65 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 66 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 67 */ 68 69 /* 70 * Copyright 2001 (c) Wasabi Systems, Inc. 71 * All rights reserved. 72 * 73 * Written by Frank van der Linden for Wasabi Systems, Inc. 74 * 75 * Redistribution and use in source and binary forms, with or without 76 * modification, are permitted provided that the following conditions 77 * are met: 78 * 1. Redistributions of source code must retain the above copyright 79 * notice, this list of conditions and the following disclaimer. 80 * 2. Redistributions in binary form must reproduce the above copyright 81 * notice, this list of conditions and the following disclaimer in the 82 * documentation and/or other materials provided with the distribution. 83 * 3. All advertising materials mentioning features or use of this software 84 * must display the following acknowledgement: 85 * This product includes software developed for the NetBSD Project by 86 * Wasabi Systems, Inc. 87 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 88 * or promote products derived from this software without specific prior 89 * written permission. 90 * 91 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 92 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 93 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 95 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 96 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 97 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 98 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 99 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 100 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 101 * POSSIBILITY OF SUCH DAMAGE. 102 */ 103 104 #include <sys/cdefs.h> 105 __KERNEL_RCSID(0, "$NetBSD: xen_pmap.c,v 1.2 2011/02/01 21:18:56 chuck Exp $"); 106 107 #include "opt_user_ldt.h" 108 #include "opt_lockdebug.h" 109 #include "opt_multiprocessor.h" 110 #include "opt_xen.h" 111 #if !defined(__x86_64__) 112 #include "opt_kstack_dr0.h" 113 #endif /* !defined(__x86_64__) */ 114 115 #include <sys/param.h> 116 #include <sys/systm.h> 117 #include <sys/proc.h> 118 #include <sys/pool.h> 119 #include <sys/kernel.h> 120 #include <sys/atomic.h> 121 #include <sys/cpu.h> 122 #include <sys/intr.h> 123 #include <sys/xcall.h> 124 125 #include <uvm/uvm.h> 126 127 #include <dev/isa/isareg.h> 128 129 #include <machine/specialreg.h> 130 #include <machine/gdt.h> 131 #include <machine/isa_machdep.h> 132 #include <machine/cpuvar.h> 133 134 #include <x86/pmap.h> 135 #include <x86/pmap_pv.h> 136 137 #include <x86/i82489reg.h> 138 #include <x86/i82489var.h> 139 140 #ifdef XEN 141 #include <xen/xen3-public/xen.h> 142 #include <xen/hypervisor.h> 143 #endif 144 145 /* flag to be used for kernel mappings: PG_u on Xen/amd64, 0 otherwise */ 146 #if defined(XEN) && defined(__x86_64__) 147 #define PG_k PG_u 148 #else 149 #define PG_k 0 150 #endif 151 152 extern paddr_t pmap_pa_start; /* PA of first physical page for this domain */ 153 extern paddr_t pmap_pa_end; /* PA of last physical page for this domain */ 154 155 int 156 pmap_enter(struct pmap *pmap, vaddr_t va, paddr_t pa, vm_prot_t prot, u_int flags) 157 { 158 paddr_t ma; 159 160 if (__predict_false(pa < pmap_pa_start || pmap_pa_end <= pa)) { 161 ma = pa; /* XXX hack */ 162 } else { 163 ma = xpmap_ptom(pa); 164 } 165 166 return pmap_enter_ma(pmap, va, ma, pa, prot, flags, DOMID_SELF); 167 } 168 169 /* 170 * pmap_kenter_ma: enter a kernel mapping without R/M (pv_entry) tracking 171 * 172 * => no need to lock anything, assume va is already allocated 173 * => should be faster than normal pmap enter function 174 * => we expect a MACHINE address 175 */ 176 177 void 178 pmap_kenter_ma(vaddr_t va, paddr_t ma, vm_prot_t prot, u_int flags) 179 { 180 pt_entry_t *pte, opte, npte; 181 182 if (va < VM_MIN_KERNEL_ADDRESS) 183 pte = vtopte(va); 184 else 185 pte = kvtopte(va); 186 187 npte = ma | ((prot & VM_PROT_WRITE) ? PG_RW : PG_RO) | 188 PG_V | PG_k; 189 if (flags & PMAP_NOCACHE) 190 npte |= PG_N; 191 192 if ((cpu_feature[2] & CPUID_NOX) && !(prot & VM_PROT_EXECUTE)) 193 npte |= PG_NX; 194 195 opte = pmap_pte_testset (pte, npte); /* zap! */ 196 197 if (pmap_valid_entry(opte)) { 198 #if defined(MULTIPROCESSOR) 199 kpreempt_disable(); 200 pmap_tlb_shootdown(pmap_kernel(), va, 0, opte); 201 kpreempt_enable(); 202 #else 203 /* Don't bother deferring in the single CPU case. */ 204 pmap_update_pg(va); 205 #endif 206 } 207 } 208 209 /* 210 * pmap_extract_ma: extract a MA for the given VA 211 */ 212 213 bool 214 pmap_extract_ma(struct pmap *pmap, vaddr_t va, paddr_t *pap) 215 { 216 pt_entry_t *ptes, pte; 217 pd_entry_t pde; 218 pd_entry_t * const *pdes; 219 struct pmap *pmap2; 220 221 kpreempt_disable(); 222 pmap_map_ptes(pmap, &pmap2, &ptes, &pdes); 223 if (!pmap_pdes_valid(va, pdes, &pde)) { 224 pmap_unmap_ptes(pmap, pmap2); 225 kpreempt_enable(); 226 return false; 227 } 228 229 pte = ptes[pl1_i(va)]; 230 pmap_unmap_ptes(pmap, pmap2); 231 kpreempt_enable(); 232 233 if (__predict_true((pte & PG_V) != 0)) { 234 if (pap != NULL) 235 *pap = (pte & PG_FRAME) | (va & (NBPD_L1 - 1)); 236 return true; 237 } 238 239 return false; 240 } 241