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
efi_destroy_1t1_map(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
efi_1t1_page(void)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 *
efi_1t1_l3(vm_offset_t va)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
efi_phys_to_kva(vm_paddr_t paddr)145 efi_phys_to_kva(vm_paddr_t paddr)
146 {
147 if (PHYS_IN_DMAP(paddr))
148 return (PHYS_TO_DMAP(paddr));
149
150 /* TODO: Map memory not in the DMAP */
151
152 return (0);
153 }
154
155 /*
156 * Create the 1:1 virtual to physical map for EFI
157 */
158 bool
efi_create_1t1_map(struct efi_md * map,int ndesc,int descsz)159 efi_create_1t1_map(struct efi_md *map, int ndesc, int descsz)
160 {
161 struct efi_md *p;
162 pt_entry_t *l3, l3_attr;
163 vm_offset_t va;
164 vm_page_t efi_l0_page;
165 uint64_t idx;
166 int i, mode;
167
168 obj_1t1_pt = vm_pager_allocate(OBJT_PHYS, NULL, L0_ENTRIES +
169 L0_ENTRIES * Ln_ENTRIES + L0_ENTRIES * Ln_ENTRIES * Ln_ENTRIES +
170 L0_ENTRIES * Ln_ENTRIES * Ln_ENTRIES * Ln_ENTRIES,
171 VM_PROT_ALL, 0, NULL);
172 VM_OBJECT_WLOCK(obj_1t1_pt);
173 efi_l0_page = efi_1t1_page();
174 VM_OBJECT_WUNLOCK(obj_1t1_pt);
175 efi_l0 = (pd_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(efi_l0_page));
176 efi_ttbr0 = ASID_TO_OPERAND(ASID_RESERVED_FOR_EFI) |
177 VM_PAGE_TO_PHYS(efi_l0_page);
178
179 for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p,
180 descsz)) {
181 if ((p->md_attr & EFI_MD_ATTR_RT) == 0)
182 continue;
183 if (p->md_virt != 0 && p->md_virt != p->md_phys) {
184 if (bootverbose)
185 printf("EFI Runtime entry %d is mapped\n", i);
186 goto fail;
187 }
188 if ((p->md_phys & EFI_PAGE_MASK) != 0) {
189 if (bootverbose)
190 printf("EFI Runtime entry %d is not aligned\n",
191 i);
192 goto fail;
193 }
194 if (p->md_phys + p->md_pages * EFI_PAGE_SIZE < p->md_phys ||
195 p->md_phys + p->md_pages * EFI_PAGE_SIZE >=
196 VM_MAXUSER_ADDRESS) {
197 printf("EFI Runtime entry %d is not in mappable for RT:"
198 "base %#016jx %#jx pages\n",
199 i, (uintmax_t)p->md_phys,
200 (uintmax_t)p->md_pages);
201 goto fail;
202 }
203 if ((p->md_attr & EFI_MD_ATTR_WB) != 0)
204 mode = VM_MEMATTR_WRITE_BACK;
205 else if ((p->md_attr & EFI_MD_ATTR_WT) != 0)
206 mode = VM_MEMATTR_WRITE_THROUGH;
207 else if ((p->md_attr & EFI_MD_ATTR_WC) != 0)
208 mode = VM_MEMATTR_WRITE_COMBINING;
209 else
210 mode = VM_MEMATTR_DEVICE;
211
212 if (bootverbose) {
213 printf("MAP %lx mode %x pages %lu\n",
214 p->md_phys, mode, p->md_pages);
215 }
216
217 l3_attr = ATTR_DEFAULT | ATTR_S1_IDX(mode) |
218 ATTR_S1_AP(ATTR_S1_AP_RW) | ATTR_S1_nG | L3_PAGE;
219 if (mode == VM_MEMATTR_DEVICE || p->md_attr & EFI_MD_ATTR_XP)
220 l3_attr |= ATTR_S1_XN;
221
222 VM_OBJECT_WLOCK(obj_1t1_pt);
223 for (va = p->md_phys, idx = 0; idx < p->md_pages;
224 idx += (PAGE_SIZE / EFI_PAGE_SIZE), va += PAGE_SIZE) {
225 l3 = efi_1t1_l3(va);
226 *l3 = va | l3_attr;
227 }
228 VM_OBJECT_WUNLOCK(obj_1t1_pt);
229 }
230
231 return (true);
232 fail:
233 efi_destroy_1t1_map();
234 return (false);
235 }
236
237 int
efi_arch_enter(void)238 efi_arch_enter(void)
239 {
240
241 CRITICAL_ASSERT(curthread);
242
243 /*
244 * Temporarily switch to EFI's page table. However, we leave curpmap
245 * unchanged in order to prevent its ASID from being reclaimed before
246 * we switch back to its page table in efi_arch_leave().
247 */
248 set_ttbr0(efi_ttbr0);
249 if (PCPU_GET(bcast_tlbi_workaround) != 0)
250 invalidate_local_icache();
251
252 return (0);
253 }
254
255 void
efi_arch_leave(void)256 efi_arch_leave(void)
257 {
258
259 /*
260 * Restore the pcpu pointer. Some UEFI implementations trash it and
261 * we don't store it before calling into them. To fix this we need
262 * to restore it after returning to the kernel context. As reading
263 * curpmap will access x18 we need to restore it before loading
264 * the pmap pointer.
265 */
266 __asm __volatile(
267 "mrs x18, tpidr_el1 \n"
268 );
269 set_ttbr0(pmap_to_ttbr0(PCPU_GET(curpmap)));
270 if (PCPU_GET(bcast_tlbi_workaround) != 0)
271 invalidate_local_icache();
272 }
273
274 int
efi_rt_arch_call(struct efirt_callinfo * ec)275 efi_rt_arch_call(struct efirt_callinfo *ec)
276 {
277
278 panic("not implemented");
279 }
280