efirt_machdep.c

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    1 /*-
    2  * Copyright (c) 2004 Marcel Moolenaar
    3  * Copyright (c) 2001 Doug Rabson
    4  * Copyright (c) 2016 The FreeBSD Foundation
    5  * All rights reserved.
    6  *
    7  * Portions of this software were developed by Konstantin Belousov
    8  * under sponsorship from the FreeBSD Foundation.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   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.
   18  *
   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
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include <sys/param.h>
   36 #include <sys/efi.h>
   37 #include <sys/kernel.h>
   38 #include <sys/linker.h>
   39 #include <sys/lock.h>
   40 #include <sys/module.h>
   41 #include <sys/mutex.h>
   42 #include <sys/clock.h>
   43 #include <sys/proc.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>
   49 #include <isa/rtc.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>
   56 #include <vm/vm.h>
   57 #include <vm/pmap.h>
   58 #include <vm/vm_map.h>
   59 #include <vm/vm_object.h>
   60 #include <vm/vm_page.h>
   61 #include <vm/vm_pager.h>
   62 
   63 static pml4_entry_t *efi_pml4;
   64 static vm_object_t obj_1t1_pt;
   65 static vm_page_t efi_pml4_page;
   66 static vm_pindex_t efi_1t1_idx;
   67 
   68 void
   69 efi_destroy_1t1_map(void)
   70 {
   71         vm_page_t m;
   72 
   73         if (obj_1t1_pt != NULL) {
   74                 VM_OBJECT_RLOCK(obj_1t1_pt);
   75                 TAILQ_FOREACH(m, &obj_1t1_pt->memq, listq)
   76                         m->wire_count = 0;
   77                 atomic_subtract_int(&vm_cnt.v_wire_count,
   78                     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_pml4 = NULL;
   85         efi_pml4_page = NULL;
   86 }
   87 
   88 /*
   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.
   91  */
   92 vm_offset_t
   93 efi_phys_to_kva(vm_paddr_t paddr)
   94 {
   95 
   96         if (paddr >= dmaplimit)
   97                 return (0);
   98         return (PHYS_TO_DMAP(paddr));
   99 }
  100 
  101 static vm_page_t
  102 efi_1t1_page(void)
  103 {
  104 
  105         return (vm_page_grab(obj_1t1_pt, efi_1t1_idx++, VM_ALLOC_NOBUSY |
  106             VM_ALLOC_WIRED | VM_ALLOC_ZERO));
  107 }
  108 
  109 static pt_entry_t *
  110 efi_1t1_pte(vm_offset_t va)
  111 {
  112         pml4_entry_t *pml4e;
  113         pdp_entry_t *pdpe;
  114         pd_entry_t *pde;
  115         pt_entry_t *pte;
  116         vm_page_t m;
  117         vm_pindex_t pml4_idx, pdp_idx, pd_idx;
  118         vm_paddr_t mphys;
  119 
  120         pml4_idx = pmap_pml4e_index(va);
  121         pml4e = &efi_pml4[pml4_idx];
  122         if (*pml4e == 0) {
  123                 m = efi_1t1_page();
  124                 mphys =  VM_PAGE_TO_PHYS(m);
  125                 *pml4e = mphys | X86_PG_RW | X86_PG_V;
  126         } else {
  127                 mphys = *pml4e & ~PAGE_MASK;
  128         }
  129 
  130         pdpe = (pdp_entry_t *)PHYS_TO_DMAP(mphys);
  131         pdp_idx = pmap_pdpe_index(va);
  132         pdpe += pdp_idx;
  133         if (*pdpe == 0) {
  134                 m = efi_1t1_page();
  135                 mphys =  VM_PAGE_TO_PHYS(m);
  136                 *pdpe = mphys | X86_PG_RW | X86_PG_V;
  137         } else {
  138                 mphys = *pdpe & ~PAGE_MASK;
  139         }
  140 
  141         pde = (pd_entry_t *)PHYS_TO_DMAP(mphys);
  142         pd_idx = pmap_pde_index(va);
  143         pde += pd_idx;
  144         if (*pde == 0) {
  145                 m = efi_1t1_page();
  146                 mphys = VM_PAGE_TO_PHYS(m);
  147                 *pde = mphys | X86_PG_RW | X86_PG_V;
  148         } else {
  149                 mphys = *pde & ~PAGE_MASK;
  150         }
  151 
  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));
  155 
  156         return (pte);
  157 }
  158 
  159 bool
  160 efi_create_1t1_map(struct efi_md *map, int ndesc, int descsz)
  161 {
  162         struct efi_md *p;
  163         pt_entry_t *pte;
  164         vm_offset_t va;
  165         uint64_t idx;
  166         int bits, i, mode;
  167 
  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);
  171         efi_1t1_idx = 0;
  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);
  177 
  178         for (i = 0, p = map; i < ndesc; i++, p = efi_next_descriptor(p,
  179             descsz)) {
  180                 if ((p->md_attr & EFI_MD_ATTR_RT) == 0)
  181                         continue;
  182                 if (p->md_virt != NULL && (uint64_t)p->md_virt != p->md_phys) {
  183                         if (bootverbose)
  184                                 printf("EFI Runtime entry %d is mapped\n", i);
  185                         goto fail;
  186                 }
  187                 if ((p->md_phys & EFI_PAGE_MASK) != 0) {
  188                         if (bootverbose)
  189                                 printf("EFI Runtime entry %d is not aligned\n",
  190                                     i);
  191                         goto fail;
  192                 }
  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);
  200                         goto fail;
  201                 }
  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;
  212                 else {
  213                         if (bootverbose)
  214                                 printf("EFI Runtime entry %d mapping "
  215                                     "attributes unsupported\n", i);
  216                         mode = VM_MEMATTR_UNCACHEABLE;
  217                 }
  218                 bits = pmap_cache_bits(kernel_pmap, mode, FALSE) | X86_PG_RW |
  219                     X86_PG_V;
  220                 VM_OBJECT_WLOCK(obj_1t1_pt);
  221                 for (va = p->md_phys, idx = 0; idx < p->md_pages; idx++,
  222                     va += PAGE_SIZE) {
  223                         pte = efi_1t1_pte(va);
  224                         pte_store(pte, va | bits);
  225                 }
  226                 VM_OBJECT_WUNLOCK(obj_1t1_pt);
  227         }
  228 
  229         return (true);
  230 
  231 fail:
  232         efi_destroy_1t1_map();
  233         return (false);
  234 }
  235 
  236 /*
  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.
  243  *
  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.
  250  *
  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
  254  * context switch.
  255  *
  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.
  262  */
  263 int
  264 efi_arch_enter(void)
  265 {
  266         pmap_t curpmap;
  267 
  268         curpmap = PCPU_GET(curpmap);
  269         PMAP_LOCK_ASSERT(curpmap, MA_OWNED);
  270 
  271         /*
  272          * IPI TLB shootdown handler invltlb_pcid_handler() reloads
  273          * %cr3 from the curpmap->pm_cr3, which would disable runtime
  274          * segments mappings.  Block the handler's action by setting
  275          * curpmap to impossible value.  See also comment in
  276          * pmap.c:pmap_activate_sw().
  277          */
  278         if (pmap_pcid_enabled && !invpcid_works)
  279                 PCPU_SET(curpmap, NULL);
  280 
  281         load_cr3(VM_PAGE_TO_PHYS(efi_pml4_page) | (pmap_pcid_enabled ?
  282             curpmap->pm_pcids[PCPU_GET(cpuid)].pm_pcid : 0));
  283         /*
  284          * If PCID is enabled, the clear CR3_PCID_SAVE bit in the loaded %cr3
  285          * causes TLB invalidation.
  286          */
  287         if (!pmap_pcid_enabled)
  288                 invltlb();
  289         return (0);
  290 }
  291 
  292 void
  293 efi_arch_leave(void)
  294 {
  295         pmap_t curpmap;
  296 
  297         curpmap = &curproc->p_vmspace->vm_pmap;
  298         if (pmap_pcid_enabled && !invpcid_works)
  299                 PCPU_SET(curpmap, curpmap);
  300         load_cr3(curpmap->pm_cr3 | (pmap_pcid_enabled ?
  301             curpmap->pm_pcids[PCPU_GET(cpuid)].pm_pcid : 0));
  302         if (!pmap_pcid_enabled)
  303                 invltlb();
  304 }
  305 
  306 /* XXX debug stuff */
  307 static int
  308 efi_time_sysctl_handler(SYSCTL_HANDLER_ARGS)
  309 {
  310         struct efi_tm tm;
  311         int error, val;
  312 
  313         val = 0;
  314         error = sysctl_handle_int(oidp, &val, 0, req);
  315         if (error != 0 || req->newptr == NULL)
  316                 return (error);
  317         error = efi_get_time(&tm);
  318         if (error == 0) {
  319                 uprintf("EFI reports: Year %d Month %d Day %d Hour %d Min %d "
  320                     "Sec %d\n", tm.tm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
  321                     tm.tm_min, tm.tm_sec);
  322         }
  323         return (error);
  324 }
  325 
  326 SYSCTL_PROC(_debug, OID_AUTO, efi_time, CTLTYPE_INT | CTLFLAG_RW, NULL, 0,
  327     efi_time_sysctl_handler, "I", "");
Cache object: bf711461c3e4a3b7d329188640e5679a
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FreeBSD/Linux Kernel Cross Reference sys/amd64/amd64/efirt_machdep.c

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sys/amd64/amd64/efirt_machdep.c
