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/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/efi.h> 42 #include <sys/kernel.h> 43 #include <sys/linker.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/proc.h> 47 #include <sys/rwlock.h> 48 #include <sys/systm.h> 49 #include <sys/vmmeter.h> 50 51 #include <machine/metadata.h> 52 #include <machine/pcb.h> 53 #include <machine/pte.h> 54 #include <machine/vfp.h> 55 #include <machine/vmparam.h> 56 57 #include <vm/vm.h> 58 #include <vm/pmap.h> 59 #include <vm/vm_map.h> 60 #include <vm/vm_object.h> 61 #include <vm/vm_page.h> 62 #include <vm/vm_pager.h> 63 64 static vm_object_t obj_1t1_pt; 65 static vm_pindex_t efi_1t1_idx; 66 static pd_entry_t *efi_l0; 67 static uint64_t efi_ttbr0; 68 69 void 70 efi_destroy_1t1_map(void) 71 { 72 vm_page_t m; 73 74 if (obj_1t1_pt != NULL) { 75 VM_OBJECT_RLOCK(obj_1t1_pt); 76 TAILQ_FOREACH(m, &obj_1t1_pt->memq, listq) 77 m->ref_count = VPRC_OBJREF; 78 vm_wire_sub(obj_1t1_pt->resident_page_count); 79 VM_OBJECT_RUNLOCK(obj_1t1_pt); 80 vm_object_deallocate(obj_1t1_pt); 81 } 82 83 obj_1t1_pt = NULL; 84 efi_1t1_idx = 0; 85 efi_l0 = NULL; 86 efi_ttbr0 = 0; 87 } 88 89 static vm_page_t 90 efi_1t1_page(void) 91 { 92 93 return (vm_page_grab(obj_1t1_pt, efi_1t1_idx++, VM_ALLOC_NOBUSY | 94 VM_ALLOC_WIRED | VM_ALLOC_ZERO)); 95 } 96 97 static pt_entry_t * 98 efi_1t1_l3(vm_offset_t va) 99 { 100 pd_entry_t *l0, *l1, *l2; 101 pt_entry_t *l3; 102 vm_pindex_t l0_idx, l1_idx, l2_idx; 103 vm_page_t m; 104 vm_paddr_t mphys; 105 106 l0_idx = pmap_l0_index(va); 107 l0 = &efi_l0[l0_idx]; 108 if (*l0 == 0) { 109 m = efi_1t1_page(); 110 mphys = VM_PAGE_TO_PHYS(m); 111 *l0 = mphys | L0_TABLE; 112 } else { 113 mphys = *l0 & ~ATTR_MASK; 114 } 115 116 l1 = (pd_entry_t *)PHYS_TO_DMAP(mphys); 117 l1_idx = pmap_l1_index(va); 118 l1 += l1_idx; 119 if (*l1 == 0) { 120 m = efi_1t1_page(); 121 mphys = VM_PAGE_TO_PHYS(m); 122 *l1 = mphys | L1_TABLE; 123 } else { 124 mphys = *l1 & ~ATTR_MASK; 125 } 126 127 l2 = (pd_entry_t *)PHYS_TO_DMAP(mphys); 128 l2_idx = pmap_l2_index(va); 129 l2 += l2_idx; 130 if (*l2 == 0) { 131 m = efi_1t1_page(); 132 mphys = VM_PAGE_TO_PHYS(m); 133 *l2 = mphys | L2_TABLE; 134 } else { 135 mphys = *l2 & ~ATTR_MASK; 136 } 137 138 l3 = (pt_entry_t *)PHYS_TO_DMAP(mphys); 139 l3 += pmap_l3_index(va); 140 KASSERT(*l3 == 0, ("%s: Already mapped: va %#jx *pt %#jx", __func__, 141 va, *l3)); 142 143 return (l3); 144 } 145 146 /* 147 * Map a physical address from EFI runtime space into KVA space. Returns 0 to 148 * indicate a failed mapping so that the caller may handle error. 149 */ 150 vm_offset_t 151 efi_phys_to_kva(vm_paddr_t paddr) 152 { 153 154 if (!PHYS_IN_DMAP(paddr)) 155 return (0); 156 return (PHYS_TO_DMAP(paddr)); 157 } 158 159 /* 160 * Create the 1:1 virtual to physical map for EFI 161 */ 162 bool 163 efi_create_1t1_map(struct efi_md *map, int ndesc, int descsz) 164 { 165 struct efi_md *p; 166 pt_entry_t *l3, l3_attr; 167 vm_offset_t va; 168 vm_page_t efi_l0_page; 169 uint64_t idx; 170 int i, mode; 171 172 obj_1t1_pt = vm_pager_allocate(OBJT_PHYS, NULL, L0_ENTRIES + 173 L0_ENTRIES * Ln_ENTRIES + L0_ENTRIES * Ln_ENTRIES * Ln_ENTRIES + 174 L0_ENTRIES * Ln_ENTRIES * Ln_ENTRIES * Ln_ENTRIES, 175 VM_PROT_ALL, 0, NULL); 176 VM_OBJECT_WLOCK(obj_1t1_pt); 177 efi_l0_page = efi_1t1_page(); 178 VM_OBJECT_WUNLOCK(obj_1t1_pt); 179 efi_l0 = (pd_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(efi_l0_page)); 180 efi_ttbr0 = ASID_TO_OPERAND(ASID_RESERVED_FOR_EFI) | 181 VM_PAGE_TO_PHYS(efi_l0_page); 182 183 for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p, 184 descsz)) { 185 if ((p->md_attr & EFI_MD_ATTR_RT) == 0) 186 continue; 187 if (p->md_virt != 0 && p->md_virt != p->md_phys) { 188 if (bootverbose) 189 printf("EFI Runtime entry %d is mapped\n", i); 190 goto fail; 191 } 192 if ((p->md_phys & EFI_PAGE_MASK) != 0) { 193 if (bootverbose) 194 printf("EFI Runtime entry %d is not aligned\n", 195 i); 196 goto fail; 197 } 198 if (p->md_phys + p->md_pages * EFI_PAGE_SIZE < p->md_phys || 199 p->md_phys + p->md_pages * EFI_PAGE_SIZE >= 200 VM_MAXUSER_ADDRESS) { 201 printf("EFI Runtime entry %d is not in mappable for RT:" 202 "base %#016jx %#jx pages\n", 203 i, (uintmax_t)p->md_phys, 204 (uintmax_t)p->md_pages); 205 goto fail; 206 } 207 if ((p->md_attr & EFI_MD_ATTR_WB) != 0) 208 mode = VM_MEMATTR_WRITE_BACK; 209 else if ((p->md_attr & EFI_MD_ATTR_WT) != 0) 210 mode = VM_MEMATTR_WRITE_THROUGH; 211 else if ((p->md_attr & EFI_MD_ATTR_WC) != 0) 212 mode = VM_MEMATTR_WRITE_COMBINING; 213 else 214 mode = VM_MEMATTR_DEVICE; 215 216 printf("MAP %lx mode %x pages %lu\n", p->md_phys, mode, p->md_pages); 217 218 l3_attr = ATTR_DEFAULT | 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; idx++, 225 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); 243 244 /* 245 * Temporarily switch to EFI's page table. However, we leave curpmap 246 * unchanged in order to prevent its ASID from being reclaimed before 247 * we switch back to its page table in efi_arch_leave(). 248 */ 249 set_ttbr0(efi_ttbr0); 250 if (PCPU_GET(bcast_tlbi_workaround) != 0) 251 invalidate_local_icache(); 252 253 return (0); 254 } 255 256 void 257 efi_arch_leave(void) 258 { 259 260 /* 261 * Restore the pcpu pointer. Some UEFI implementations trash it and 262 * we don't store it before calling into them. To fix this we need 263 * to restore it after returning to the kernel context. As reading 264 * curpmap will access x18 we need to restore it before loading 265 * the pmap pointer. 266 */ 267 __asm __volatile( 268 "mrs x18, tpidr_el1 \n" 269 ); 270 set_ttbr0(pmap_to_ttbr0(PCPU_GET(curpmap))); 271 if (PCPU_GET(bcast_tlbi_workaround) != 0) 272 invalidate_local_icache(); 273 } 274 275 int 276 efi_rt_arch_call(struct efirt_callinfo *ec) 277 { 278 279 panic("not implemented"); 280 } 281