2 * Copyright (c) 2004 Marcel Moolenaar
3 * Copyright (c) 2001 Doug Rabson
4 * Copyright (c) 2016 The FreeBSD Foundation
7 * Portions of this software were developed by Konstantin Belousov
8 * under sponsorship from the FreeBSD Foundation.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
37 #include <sys/kernel.h>
38 #include <sys/linker.h>
40 #include <sys/module.h>
41 #include <sys/mutex.h>
42 #include <sys/clock.h>
44 #include <sys/rwlock.h>
45 #include <sys/sched.h>
46 #include <sys/sysctl.h>
47 #include <sys/systm.h>
48 #include <sys/vmmeter.h>
50 #include <machine/fpu.h>
51 #include <machine/efi.h>
52 #include <machine/metadata.h>
53 #include <machine/md_var.h>
54 #include <machine/smp.h>
55 #include <machine/vmparam.h>
58 #include <vm/vm_extern.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>
64 static pml4_entry_t *efi_pml4;
65 static vm_object_t obj_1t1_pt;
66 static vm_page_t efi_pml4_page;
67 static vm_pindex_t efi_1t1_idx;
70 efi_destroy_1t1_map(void)
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);
89 * Map a physical address from EFI runtime space into KVA space. Returns 0 to
90 * indicate a failed mapping so that the caller may handle error.
93 efi_phys_to_kva(vm_paddr_t paddr)
96 if (paddr >= dmaplimit)
98 return (PHYS_TO_DMAP(paddr));
105 return (vm_page_grab(obj_1t1_pt, efi_1t1_idx++, VM_ALLOC_NOBUSY |
106 VM_ALLOC_WIRED | VM_ALLOC_ZERO));
110 efi_1t1_pte(vm_offset_t va)
117 vm_pindex_t pml4_idx, pdp_idx, pd_idx;
120 pml4_idx = pmap_pml4e_index(va);
121 pml4e = &efi_pml4[pml4_idx];
124 mphys = VM_PAGE_TO_PHYS(m);
125 *pml4e = mphys | X86_PG_RW | X86_PG_V;
127 mphys = *pml4e & ~PAGE_MASK;
130 pdpe = (pdp_entry_t *)PHYS_TO_DMAP(mphys);
131 pdp_idx = pmap_pdpe_index(va);
135 mphys = VM_PAGE_TO_PHYS(m);
136 *pdpe = mphys | X86_PG_RW | X86_PG_V;
138 mphys = *pdpe & ~PAGE_MASK;
141 pde = (pd_entry_t *)PHYS_TO_DMAP(mphys);
142 pd_idx = pmap_pde_index(va);
146 mphys = VM_PAGE_TO_PHYS(m);
147 *pde = mphys | X86_PG_RW | X86_PG_V;
149 mphys = *pde & ~PAGE_MASK;
152 pte = (pt_entry_t *)PHYS_TO_DMAP(mphys);
153 pte += pmap_pte_index(va);
154 KASSERT(*pte == 0, ("va %#jx *pt %#jx", va, *pte));
160 efi_create_1t1_map(struct efi_md *map, int ndesc, int descsz)
168 obj_1t1_pt = vm_pager_allocate(OBJT_PHYS, NULL, ptoa(1 +
169 NPML4EPG + NPML4EPG * NPDPEPG + NPML4EPG * NPDPEPG * NPDEPG),
170 VM_PROT_ALL, 0, NULL);
172 VM_OBJECT_WLOCK(obj_1t1_pt);
173 efi_pml4_page = efi_1t1_page();
174 VM_OBJECT_WUNLOCK(obj_1t1_pt);
175 efi_pml4 = (pml4_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(efi_pml4_page));
176 pmap_pinit_pml4(efi_pml4_page);
178 for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p,
180 if ((p->md_attr & EFI_MD_ATTR_RT) == 0)
182 if (p->md_virt != NULL && (uint64_t)p->md_virt != p->md_phys) {
184 printf("EFI Runtime entry %d is mapped\n", i);
187 if ((p->md_phys & EFI_PAGE_MASK) != 0) {
189 printf("EFI Runtime entry %d is not aligned\n",
193 if (p->md_phys + p->md_pages * EFI_PAGE_SIZE < p->md_phys ||
194 p->md_phys + p->md_pages * EFI_PAGE_SIZE >=
195 VM_MAXUSER_ADDRESS) {
196 printf("EFI Runtime entry %d is not in mappable for RT:"
197 "base %#016jx %#jx pages\n",
198 i, (uintmax_t)p->md_phys,
199 (uintmax_t)p->md_pages);
202 if ((p->md_attr & EFI_MD_ATTR_WB) != 0)
203 mode = VM_MEMATTR_WRITE_BACK;
204 else if ((p->md_attr & EFI_MD_ATTR_WT) != 0)
205 mode = VM_MEMATTR_WRITE_THROUGH;
206 else if ((p->md_attr & EFI_MD_ATTR_WC) != 0)
207 mode = VM_MEMATTR_WRITE_COMBINING;
208 else if ((p->md_attr & EFI_MD_ATTR_WP) != 0)
209 mode = VM_MEMATTR_WRITE_PROTECTED;
210 else if ((p->md_attr & EFI_MD_ATTR_UC) != 0)
211 mode = VM_MEMATTR_UNCACHEABLE;
214 printf("EFI Runtime entry %d mapping "
215 "attributes unsupported\n", i);
216 mode = VM_MEMATTR_UNCACHEABLE;
218 bits = pmap_cache_bits(kernel_pmap, mode, FALSE) | X86_PG_RW |
220 VM_OBJECT_WLOCK(obj_1t1_pt);
221 for (va = p->md_phys, idx = 0; idx < p->md_pages; idx++,
223 pte = efi_1t1_pte(va);
224 pte_store(pte, va | bits);
226 VM_OBJECT_WUNLOCK(obj_1t1_pt);
232 efi_destroy_1t1_map();
237 * Create an environment for the EFI runtime code call. The most
238 * important part is creating the required 1:1 physical->virtual
239 * mappings for the runtime segments. To do that, we manually create
240 * page table which unmap userspace but gives correct kernel mapping.
241 * The 1:1 mappings for runtime segments usually occupy low 4G of the
242 * physical address map.
244 * The 1:1 mappings were chosen over the SetVirtualAddressMap() EFI RT
245 * service, because there are some BIOSes which fail to correctly
246 * relocate itself on the call, requiring both 1:1 and virtual
247 * mapping. As result, we must provide 1:1 mapping anyway, so no
248 * reason to bother with the virtual map, and no need to add a
249 * complexity into loader.
251 * The fpu_kern_enter() call allows firmware to use FPU, as mandated
252 * by the specification. In particular, CR0.TS bit is cleared. Also
253 * it enters critical section, giving us neccessary protection against
256 * There is no need to disable interrupts around the change of %cr3,
257 * the kernel mappings are correct, while we only grabbed the
258 * userspace portion of VA. Interrupts handlers must not access
259 * userspace. Having interrupts enabled fixes the issue with
260 * firmware/SMM long operation, which would negatively affect IPIs,
261 * esp. TLB shootdown requests.
268 curpmap = PCPU_GET(curpmap);
269 PMAP_LOCK_ASSERT(curpmap, MA_OWNED);
270 curthread->td_md.md_efirt_dis_pf = vm_fault_disable_pagefaults();
273 * IPI TLB shootdown handler invltlb_pcid_handler() reloads
274 * %cr3 from the curpmap->pm_cr3, which would disable runtime
275 * segments mappings. Block the handler's action by setting
276 * curpmap to impossible value. See also comment in
277 * pmap.c:pmap_activate_sw().
279 if (pmap_pcid_enabled && !invpcid_works)
280 PCPU_SET(curpmap, NULL);
282 load_cr3(VM_PAGE_TO_PHYS(efi_pml4_page) | (pmap_pcid_enabled ?
283 curpmap->pm_pcids[PCPU_GET(cpuid)].pm_pcid : 0));
285 * If PCID is enabled, the clear CR3_PCID_SAVE bit in the loaded %cr3
286 * causes TLB invalidation.
288 if (!pmap_pcid_enabled)
298 curpmap = &curproc->p_vmspace->vm_pmap;
299 if (pmap_pcid_enabled && !invpcid_works)
300 PCPU_SET(curpmap, curpmap);
301 load_cr3(curpmap->pm_cr3 | (pmap_pcid_enabled ?
302 curpmap->pm_pcids[PCPU_GET(cpuid)].pm_pcid : 0));
303 if (!pmap_pcid_enabled)
305 vm_fault_enable_pagefaults(curthread->td_md.md_efirt_dis_pf);
308 /* XXX debug stuff */
310 efi_time_sysctl_handler(SYSCTL_HANDLER_ARGS)
316 error = sysctl_handle_int(oidp, &val, 0, req);
317 if (error != 0 || req->newptr == NULL)
319 error = efi_get_time(&tm);
321 uprintf("EFI reports: Year %d Month %d Day %d Hour %d Min %d "
322 "Sec %d\n", tm.tm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
323 tm.tm_min, tm.tm_sec);
328 SYSCTL_PROC(_debug, OID_AUTO, efi_time,
329 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 0,
330 efi_time_sysctl_handler, "I",