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
efi_destroy_1t1_map(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
efi_1t1_page(void)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 *
efi_1t1_l3(vm_offset_t va)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
efi_phys_to_kva(vm_paddr_t paddr)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
efi_create_1t1_map(struct efi_md * map,int ndesc,int descsz)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 != NULL && (uint64_t)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
efi_arch_enter(void)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
efi_arch_leave(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
efi_rt_arch_call(struct efirt_callinfo * ec)276 efi_rt_arch_call(struct efirt_callinfo *ec)
277 {
278
279 panic("not implemented");
280 }
281