1 /*- 2 * Copyright (c) 2004 Marcel Moolenaar 3 * Copyright (c) 2001 Doug Rabson 4 * Copyright (c) 2016 The FreeBSD Foundation 5 * Copyright (c) 2017 Andrew Turner 6 * All rights reserved. 7 * 8 * Portions of this software were developed by Konstantin Belousov 9 * under sponsorship from the FreeBSD Foundation. 10 * 11 * This software was developed by SRI International and the University of 12 * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 13 * ("CTSRD"), as part of the DARPA CRASH research programme. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/efi.h> 39 #include <sys/kernel.h> 40 #include <sys/linker.h> 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <sys/proc.h> 44 #include <sys/rwlock.h> 45 #include <sys/systm.h> 46 #include <sys/vmmeter.h> 47 48 #include <machine/pte.h> 49 #include <machine/vmparam.h> 50 51 #include <vm/vm.h> 52 #include <vm/pmap.h> 53 #include <vm/vm_extern.h> 54 #include <vm/vm_map.h> 55 #include <vm/vm_object.h> 56 #include <vm/vm_page.h> 57 #include <vm/vm_pager.h> 58 59 static vm_object_t obj_1t1_pt; 60 static vm_pindex_t efi_1t1_idx; 61 static pd_entry_t *efi_l0; 62 static uint64_t efi_ttbr0; 63 64 void 65 efi_destroy_1t1_map(void) 66 { 67 vm_page_t m; 68 69 if (obj_1t1_pt != NULL) { 70 VM_OBJECT_RLOCK(obj_1t1_pt); 71 TAILQ_FOREACH(m, &obj_1t1_pt->memq, listq) 72 m->ref_count = VPRC_OBJREF; 73 vm_wire_sub(obj_1t1_pt->resident_page_count); 74 VM_OBJECT_RUNLOCK(obj_1t1_pt); 75 vm_object_deallocate(obj_1t1_pt); 76 } 77 78 obj_1t1_pt = NULL; 79 efi_1t1_idx = 0; 80 efi_l0 = NULL; 81 efi_ttbr0 = 0; 82 } 83 84 static vm_page_t 85 efi_1t1_page(void) 86 { 87 88 return (vm_page_grab(obj_1t1_pt, efi_1t1_idx++, VM_ALLOC_NOBUSY | 89 VM_ALLOC_WIRED | VM_ALLOC_ZERO)); 90 } 91 92 static pt_entry_t * 93 efi_1t1_l3(vm_offset_t va) 94 { 95 pd_entry_t *l0, *l1, *l2; 96 pt_entry_t *l3; 97 vm_pindex_t l0_idx, l1_idx, l2_idx; 98 vm_page_t m; 99 vm_paddr_t mphys; 100 101 l0_idx = pmap_l0_index(va); 102 l0 = &efi_l0[l0_idx]; 103 if (*l0 == 0) { 104 m = efi_1t1_page(); 105 mphys = VM_PAGE_TO_PHYS(m); 106 *l0 = PHYS_TO_PTE(mphys) | L0_TABLE; 107 } else { 108 mphys = PTE_TO_PHYS(*l0); 109 } 110 111 l1 = (pd_entry_t *)PHYS_TO_DMAP(mphys); 112 l1_idx = pmap_l1_index(va); 113 l1 += l1_idx; 114 if (*l1 == 0) { 115 m = efi_1t1_page(); 116 mphys = VM_PAGE_TO_PHYS(m); 117 *l1 = PHYS_TO_PTE(mphys) | L1_TABLE; 118 } else { 119 mphys = PTE_TO_PHYS(*l1); 120 } 121 122 l2 = (pd_entry_t *)PHYS_TO_DMAP(mphys); 123 l2_idx = pmap_l2_index(va); 124 l2 += l2_idx; 125 if (*l2 == 0) { 126 m = efi_1t1_page(); 127 mphys = VM_PAGE_TO_PHYS(m); 128 *l2 = PHYS_TO_PTE(mphys) | L2_TABLE; 129 } else { 130 mphys = PTE_TO_PHYS(*l2); 131 } 132 133 l3 = (pt_entry_t *)PHYS_TO_DMAP(mphys); 134 l3 += pmap_l3_index(va); 135 KASSERT(*l3 == 0, ("%s: Already mapped: va %#jx *pt %#jx", __func__, 136 va, *l3)); 137 138 return (l3); 139 } 140 141 /* 142 * Map a physical address from EFI runtime space into KVA space. Returns 0 to 143 * indicate a failed mapping so that the caller may handle error. 144 */ 145 vm_offset_t 146 efi_phys_to_kva(vm_paddr_t paddr) 147 { 148 if (PHYS_IN_DMAP(paddr)) 149 return (PHYS_TO_DMAP(paddr)); 150 151 /* TODO: Map memory not in the DMAP */ 152 153 return (0); 154 } 155 156 /* 157 * Create the 1:1 virtual to physical map for EFI 158 */ 159 bool 160 efi_create_1t1_map(struct efi_md *map, int ndesc, int descsz) 161 { 162 struct efi_md *p; 163 pt_entry_t *l3, l3_attr; 164 vm_offset_t va; 165 vm_page_t efi_l0_page; 166 uint64_t idx; 167 int i, mode; 168 169 obj_1t1_pt = vm_pager_allocate(OBJT_PHYS, NULL, L0_ENTRIES + 170 L0_ENTRIES * Ln_ENTRIES + L0_ENTRIES * Ln_ENTRIES * Ln_ENTRIES + 171 L0_ENTRIES * Ln_ENTRIES * Ln_ENTRIES * Ln_ENTRIES, 172 VM_PROT_ALL, 0, NULL); 173 VM_OBJECT_WLOCK(obj_1t1_pt); 174 efi_l0_page = efi_1t1_page(); 175 VM_OBJECT_WUNLOCK(obj_1t1_pt); 176 efi_l0 = (pd_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(efi_l0_page)); 177 efi_ttbr0 = ASID_TO_OPERAND(ASID_RESERVED_FOR_EFI) | 178 VM_PAGE_TO_PHYS(efi_l0_page); 179 180 for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p, 181 descsz)) { 182 if ((p->md_attr & EFI_MD_ATTR_RT) == 0) 183 continue; 184 if (p->md_virt != 0 && p->md_virt != p->md_phys) { 185 if (bootverbose) 186 printf("EFI Runtime entry %d is mapped\n", i); 187 goto fail; 188 } 189 if ((p->md_phys & EFI_PAGE_MASK) != 0) { 190 if (bootverbose) 191 printf("EFI Runtime entry %d is not aligned\n", 192 i); 193 goto fail; 194 } 195 if (p->md_phys + p->md_pages * EFI_PAGE_SIZE < p->md_phys || 196 p->md_phys + p->md_pages * EFI_PAGE_SIZE >= 197 VM_MAXUSER_ADDRESS) { 198 printf("EFI Runtime entry %d is not in mappable for RT:" 199 "base %#016jx %#jx pages\n", 200 i, (uintmax_t)p->md_phys, 201 (uintmax_t)p->md_pages); 202 goto fail; 203 } 204 if ((p->md_attr & EFI_MD_ATTR_WB) != 0) 205 mode = VM_MEMATTR_WRITE_BACK; 206 else if ((p->md_attr & EFI_MD_ATTR_WT) != 0) 207 mode = VM_MEMATTR_WRITE_THROUGH; 208 else if ((p->md_attr & EFI_MD_ATTR_WC) != 0) 209 mode = VM_MEMATTR_WRITE_COMBINING; 210 else 211 mode = VM_MEMATTR_DEVICE; 212 213 if (bootverbose) { 214 printf("MAP %lx mode %x pages %lu\n", 215 p->md_phys, mode, p->md_pages); 216 } 217 218 l3_attr = ATTR_AF | pmap_sh_attr | ATTR_S1_IDX(mode) | 219 ATTR_S1_AP(ATTR_S1_AP_RW) | ATTR_S1_nG | L3_PAGE; 220 if (mode == VM_MEMATTR_DEVICE || p->md_attr & EFI_MD_ATTR_XP) 221 l3_attr |= ATTR_S1_XN; 222 223 VM_OBJECT_WLOCK(obj_1t1_pt); 224 for (va = p->md_phys, idx = 0; idx < p->md_pages; 225 idx += (PAGE_SIZE / EFI_PAGE_SIZE), va += PAGE_SIZE) { 226 l3 = efi_1t1_l3(va); 227 *l3 = va | l3_attr; 228 } 229 VM_OBJECT_WUNLOCK(obj_1t1_pt); 230 } 231 232 return (true); 233 fail: 234 efi_destroy_1t1_map(); 235 return (false); 236 } 237 238 int 239 efi_arch_enter(void) 240 { 241 242 CRITICAL_ASSERT(curthread); 243 curthread->td_md.md_efirt_dis_pf = vm_fault_disable_pagefaults(); 244 245 /* 246 * Temporarily switch to EFI's page table. However, we leave curpmap 247 * unchanged in order to prevent its ASID from being reclaimed before 248 * we switch back to its page table in efi_arch_leave(). 249 */ 250 set_ttbr0(efi_ttbr0); 251 if (PCPU_GET(bcast_tlbi_workaround) != 0) 252 invalidate_local_icache(); 253 254 return (0); 255 } 256 257 void 258 efi_arch_leave(void) 259 { 260 261 /* 262 * Restore the pcpu pointer. Some UEFI implementations trash it and 263 * we don't store it before calling into them. To fix this we need 264 * to restore it after returning to the kernel context. As reading 265 * curpmap will access x18 we need to restore it before loading 266 * the pmap pointer. 267 */ 268 __asm __volatile( 269 "mrs x18, tpidr_el1 \n" 270 ); 271 set_ttbr0(pmap_to_ttbr0(PCPU_GET(curpmap))); 272 if (PCPU_GET(bcast_tlbi_workaround) != 0) 273 invalidate_local_icache(); 274 vm_fault_enable_pagefaults(curthread->td_md.md_efirt_dis_pf); 275 } 276 277