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_map.h> 54 #include <vm/vm_object.h> 55 #include <vm/vm_page.h> 56 #include <vm/vm_pager.h> 57 58 static vm_object_t obj_1t1_pt; 59 static vm_pindex_t efi_1t1_idx; 60 static pd_entry_t *efi_l0; 61 static uint64_t efi_ttbr0; 62 63 void 64 efi_destroy_1t1_map(void) 65 { 66 vm_page_t m; 67 68 if (obj_1t1_pt != NULL) { 69 VM_OBJECT_RLOCK(obj_1t1_pt); 70 TAILQ_FOREACH(m, &obj_1t1_pt->memq, listq) 71 m->ref_count = VPRC_OBJREF; 72 vm_wire_sub(obj_1t1_pt->resident_page_count); 73 VM_OBJECT_RUNLOCK(obj_1t1_pt); 74 vm_object_deallocate(obj_1t1_pt); 75 } 76 77 obj_1t1_pt = NULL; 78 efi_1t1_idx = 0; 79 efi_l0 = NULL; 80 efi_ttbr0 = 0; 81 } 82 83 static vm_page_t 84 efi_1t1_page(void) 85 { 86 87 return (vm_page_grab(obj_1t1_pt, efi_1t1_idx++, VM_ALLOC_NOBUSY | 88 VM_ALLOC_WIRED | VM_ALLOC_ZERO)); 89 } 90 91 static pt_entry_t * 92 efi_1t1_l3(vm_offset_t va) 93 { 94 pd_entry_t *l0, *l1, *l2; 95 pt_entry_t *l3; 96 vm_pindex_t l0_idx, l1_idx, l2_idx; 97 vm_page_t m; 98 vm_paddr_t mphys; 99 100 l0_idx = pmap_l0_index(va); 101 l0 = &efi_l0[l0_idx]; 102 if (*l0 == 0) { 103 m = efi_1t1_page(); 104 mphys = VM_PAGE_TO_PHYS(m); 105 *l0 = PHYS_TO_PTE(mphys) | L0_TABLE; 106 } else { 107 mphys = PTE_TO_PHYS(*l0); 108 } 109 110 l1 = (pd_entry_t *)PHYS_TO_DMAP(mphys); 111 l1_idx = pmap_l1_index(va); 112 l1 += l1_idx; 113 if (*l1 == 0) { 114 m = efi_1t1_page(); 115 mphys = VM_PAGE_TO_PHYS(m); 116 *l1 = PHYS_TO_PTE(mphys) | L1_TABLE; 117 } else { 118 mphys = PTE_TO_PHYS(*l1); 119 } 120 121 l2 = (pd_entry_t *)PHYS_TO_DMAP(mphys); 122 l2_idx = pmap_l2_index(va); 123 l2 += l2_idx; 124 if (*l2 == 0) { 125 m = efi_1t1_page(); 126 mphys = VM_PAGE_TO_PHYS(m); 127 *l2 = PHYS_TO_PTE(mphys) | L2_TABLE; 128 } else { 129 mphys = PTE_TO_PHYS(*l2); 130 } 131 132 l3 = (pt_entry_t *)PHYS_TO_DMAP(mphys); 133 l3 += pmap_l3_index(va); 134 KASSERT(*l3 == 0, ("%s: Already mapped: va %#jx *pt %#jx", __func__, 135 va, *l3)); 136 137 return (l3); 138 } 139 140 /* 141 * Map a physical address from EFI runtime space into KVA space. Returns 0 to 142 * indicate a failed mapping so that the caller may handle error. 143 */ 144 vm_offset_t 145 efi_phys_to_kva(vm_paddr_t paddr) 146 { 147 vm_offset_t vaddr; 148 149 if (PHYS_IN_DMAP(paddr)) { 150 vaddr = PHYS_TO_DMAP(paddr); 151 if (pmap_klookup(vaddr, NULL)) 152 return (vaddr); 153 } 154 155 /* TODO: Map memory not in the DMAP */ 156 157 return (0); 158 } 159 160 /* 161 * Create the 1:1 virtual to physical map for EFI 162 */ 163 bool 164 efi_create_1t1_map(struct efi_md *map, int ndesc, int descsz) 165 { 166 struct efi_md *p; 167 pt_entry_t *l3, l3_attr; 168 vm_offset_t va; 169 vm_page_t efi_l0_page; 170 uint64_t idx; 171 int i, mode; 172 173 obj_1t1_pt = vm_pager_allocate(OBJT_PHYS, NULL, L0_ENTRIES + 174 L0_ENTRIES * Ln_ENTRIES + L0_ENTRIES * Ln_ENTRIES * Ln_ENTRIES + 175 L0_ENTRIES * Ln_ENTRIES * Ln_ENTRIES * Ln_ENTRIES, 176 VM_PROT_ALL, 0, NULL); 177 VM_OBJECT_WLOCK(obj_1t1_pt); 178 efi_l0_page = efi_1t1_page(); 179 VM_OBJECT_WUNLOCK(obj_1t1_pt); 180 efi_l0 = (pd_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(efi_l0_page)); 181 efi_ttbr0 = ASID_TO_OPERAND(ASID_RESERVED_FOR_EFI) | 182 VM_PAGE_TO_PHYS(efi_l0_page); 183 184 for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p, 185 descsz)) { 186 if ((p->md_attr & EFI_MD_ATTR_RT) == 0) 187 continue; 188 if (p->md_virt != 0 && p->md_virt != p->md_phys) { 189 if (bootverbose) 190 printf("EFI Runtime entry %d is mapped\n", i); 191 goto fail; 192 } 193 if ((p->md_phys & EFI_PAGE_MASK) != 0) { 194 if (bootverbose) 195 printf("EFI Runtime entry %d is not aligned\n", 196 i); 197 goto fail; 198 } 199 if (p->md_phys + p->md_pages * EFI_PAGE_SIZE < p->md_phys || 200 p->md_phys + p->md_pages * EFI_PAGE_SIZE >= 201 VM_MAXUSER_ADDRESS) { 202 printf("EFI Runtime entry %d is not in mappable for RT:" 203 "base %#016jx %#jx pages\n", 204 i, (uintmax_t)p->md_phys, 205 (uintmax_t)p->md_pages); 206 goto fail; 207 } 208 if ((p->md_attr & EFI_MD_ATTR_WB) != 0) 209 mode = VM_MEMATTR_WRITE_BACK; 210 else if ((p->md_attr & EFI_MD_ATTR_WT) != 0) 211 mode = VM_MEMATTR_WRITE_THROUGH; 212 else if ((p->md_attr & EFI_MD_ATTR_WC) != 0) 213 mode = VM_MEMATTR_WRITE_COMBINING; 214 else 215 mode = VM_MEMATTR_DEVICE; 216 217 if (bootverbose) { 218 printf("MAP %lx mode %x pages %lu\n", 219 p->md_phys, mode, p->md_pages); 220 } 221 222 l3_attr = ATTR_DEFAULT | ATTR_S1_IDX(mode) | 223 ATTR_S1_AP(ATTR_S1_AP_RW) | ATTR_S1_nG | L3_PAGE; 224 if (mode == VM_MEMATTR_DEVICE || p->md_attr & EFI_MD_ATTR_XP) 225 l3_attr |= ATTR_S1_XN; 226 227 VM_OBJECT_WLOCK(obj_1t1_pt); 228 for (va = p->md_phys, idx = 0; idx < p->md_pages; 229 idx += (PAGE_SIZE / EFI_PAGE_SIZE), va += PAGE_SIZE) { 230 l3 = efi_1t1_l3(va); 231 *l3 = va | l3_attr; 232 } 233 VM_OBJECT_WUNLOCK(obj_1t1_pt); 234 } 235 236 return (true); 237 fail: 238 efi_destroy_1t1_map(); 239 return (false); 240 } 241 242 int 243 efi_arch_enter(void) 244 { 245 246 CRITICAL_ASSERT(curthread); 247 248 /* 249 * Temporarily switch to EFI's page table. However, we leave curpmap 250 * unchanged in order to prevent its ASID from being reclaimed before 251 * we switch back to its page table in efi_arch_leave(). 252 */ 253 set_ttbr0(efi_ttbr0); 254 if (PCPU_GET(bcast_tlbi_workaround) != 0) 255 invalidate_local_icache(); 256 257 return (0); 258 } 259 260 void 261 efi_arch_leave(void) 262 { 263 264 /* 265 * Restore the pcpu pointer. Some UEFI implementations trash it and 266 * we don't store it before calling into them. To fix this we need 267 * to restore it after returning to the kernel context. As reading 268 * curpmap will access x18 we need to restore it before loading 269 * the pmap pointer. 270 */ 271 __asm __volatile( 272 "mrs x18, tpidr_el1 \n" 273 ); 274 set_ttbr0(pmap_to_ttbr0(PCPU_GET(curpmap))); 275 if (PCPU_GET(bcast_tlbi_workaround) != 0) 276 invalidate_local_icache(); 277 } 278 279 int 280 efi_rt_arch_call(struct efirt_callinfo *ec) 281 { 282 283 panic("not implemented"); 284 } 285