The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/acpica/acpi_machdep.c

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    1 /*-
    2  * Copyright (c) 2001 Mitsuru IWASAKI
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/10.3/sys/i386/acpica/acpi_machdep.c 246855 2013-02-15 22:43:08Z jkim $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/bus.h>
   32 #include <sys/kernel.h>
   33 #include <sys/module.h>
   34 #include <sys/sysctl.h>
   35 
   36 #include <vm/vm.h>
   37 #include <vm/pmap.h>
   38 
   39 #include <contrib/dev/acpica/include/acpi.h>
   40 #include <contrib/dev/acpica/include/accommon.h>
   41 #include <contrib/dev/acpica/include/actables.h>
   42 
   43 #include <dev/acpica/acpivar.h>
   44 
   45 #include <machine/nexusvar.h>
   46 
   47 uint32_t acpi_resume_beep;
   48 TUNABLE_INT("debug.acpi.resume_beep", &acpi_resume_beep);
   49 SYSCTL_UINT(_debug_acpi, OID_AUTO, resume_beep, CTLFLAG_RW, &acpi_resume_beep,
   50     0, "Beep the PC speaker when resuming");
   51 
   52 uint32_t acpi_reset_video;
   53 TUNABLE_INT("hw.acpi.reset_video", &acpi_reset_video);
   54 
   55 static int intr_model = ACPI_INTR_PIC;
   56 
   57 int
   58 acpi_machdep_init(device_t dev)
   59 {
   60         struct acpi_softc *sc;
   61 
   62         sc = device_get_softc(dev);
   63 
   64         acpi_apm_init(sc);
   65         acpi_install_wakeup_handler(sc);
   66 
   67         if (intr_model == ACPI_INTR_PIC)
   68                 BUS_CONFIG_INTR(dev, AcpiGbl_FADT.SciInterrupt,
   69                     INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
   70         else
   71                 acpi_SetIntrModel(intr_model);
   72 
   73         SYSCTL_ADD_UINT(&sc->acpi_sysctl_ctx,
   74             SYSCTL_CHILDREN(sc->acpi_sysctl_tree), OID_AUTO,
   75             "reset_video", CTLFLAG_RW, &acpi_reset_video, 0,
   76             "Call the VESA reset BIOS vector on the resume path");
   77 
   78         return (0);
   79 }
   80 
   81 void
   82 acpi_SetDefaultIntrModel(int model)
   83 {
   84 
   85         intr_model = model;
   86 }
   87 
   88 /* Check BIOS date.  If 1998 or older, disable ACPI. */
   89 int
   90 acpi_machdep_quirks(int *quirks)
   91 {
   92         char *va;
   93         int year;
   94 
   95         /* BIOS address 0xffff5 contains the date in the format mm/dd/yy. */
   96         va = pmap_mapbios(0xffff0, 16);
   97         sscanf(va + 11, "%2d", &year);
   98         pmap_unmapbios((vm_offset_t)va, 16);
   99 
  100         /* 
  101          * Date must be >= 1/1/1999 or we don't trust ACPI.  Note that this
  102          * check must be changed by my 114th birthday.
  103          */
  104         if (year > 90 && year < 99)
  105                 *quirks = ACPI_Q_BROKEN;
  106 
  107         return (0);
  108 }
  109 
  110 void
  111 acpi_cpu_c1()
  112 {
  113 
  114         __asm __volatile("sti; hlt");
  115 }
  116 
  117 /*
  118  * Support for mapping ACPI tables during early boot.  This abuses the
  119  * crashdump map because the kernel cannot allocate KVA in
  120  * pmap_mapbios() when this is used.  This makes the following
  121  * assumptions about how we use this KVA: pages 0 and 1 are used to
  122  * map in the header of each table found via the RSDT or XSDT and
  123  * pages 2 to n are used to map in the RSDT or XSDT.  This has to use
  124  * 2 pages for the table headers in case a header spans a page
  125  * boundary.
  126  *
  127  * XXX: We don't ensure the table fits in the available address space
  128  * in the crashdump map.
  129  */
  130 
  131 /*
  132  * Map some memory using the crashdump map.  'offset' is an offset in
  133  * pages into the crashdump map to use for the start of the mapping.
  134  */
  135 static void *
  136 table_map(vm_paddr_t pa, int offset, vm_offset_t length)
  137 {
  138         vm_offset_t va, off;
  139         void *data;
  140 
  141         off = pa & PAGE_MASK;
  142         length = round_page(length + off);
  143         pa = pa & PG_FRAME;
  144         va = (vm_offset_t)pmap_kenter_temporary(pa, offset) +
  145             (offset * PAGE_SIZE);
  146         data = (void *)(va + off);
  147         length -= PAGE_SIZE;
  148         while (length > 0) {
  149                 va += PAGE_SIZE;
  150                 pa += PAGE_SIZE;
  151                 length -= PAGE_SIZE;
  152                 pmap_kenter(va, pa);
  153                 invlpg(va);
  154         }
  155         return (data);
  156 }
  157 
  158 /* Unmap memory previously mapped with table_map(). */
  159 static void
  160 table_unmap(void *data, vm_offset_t length)
  161 {
  162         vm_offset_t va, off;
  163 
  164         va = (vm_offset_t)data;
  165         off = va & PAGE_MASK;
  166         length = round_page(length + off);
  167         va &= ~PAGE_MASK;
  168         while (length > 0) {
  169                 pmap_kremove(va);
  170                 invlpg(va);
  171                 va += PAGE_SIZE;
  172                 length -= PAGE_SIZE;
  173         }
  174 }
  175 
  176 /*
  177  * Map a table at a given offset into the crashdump map.  It first
  178  * maps the header to determine the table length and then maps the
  179  * entire table.
  180  */
  181 static void *
  182 map_table(vm_paddr_t pa, int offset, const char *sig)
  183 {
  184         ACPI_TABLE_HEADER *header;
  185         vm_offset_t length;
  186         void *table;
  187 
  188         header = table_map(pa, offset, sizeof(ACPI_TABLE_HEADER));
  189         if (strncmp(header->Signature, sig, ACPI_NAME_SIZE) != 0) {
  190                 table_unmap(header, sizeof(ACPI_TABLE_HEADER));
  191                 return (NULL);
  192         }
  193         length = header->Length;
  194         table_unmap(header, sizeof(ACPI_TABLE_HEADER));
  195         table = table_map(pa, offset, length);
  196         if (ACPI_FAILURE(AcpiTbChecksum(table, length))) {
  197                 if (bootverbose)
  198                         printf("ACPI: Failed checksum for table %s\n", sig);
  199 #if (ACPI_CHECKSUM_ABORT)
  200                 table_unmap(table, length);
  201                 return (NULL);
  202 #endif
  203         }
  204         return (table);
  205 }
  206 
  207 /*
  208  * See if a given ACPI table is the requested table.  Returns the
  209  * length of the able if it matches or zero on failure.
  210  */
  211 static int
  212 probe_table(vm_paddr_t address, const char *sig)
  213 {
  214         ACPI_TABLE_HEADER *table;
  215 
  216         table = table_map(address, 0, sizeof(ACPI_TABLE_HEADER));
  217         if (table == NULL) {
  218                 if (bootverbose)
  219                         printf("ACPI: Failed to map table at 0x%jx\n",
  220                             (uintmax_t)address);
  221                 return (0);
  222         }
  223         if (bootverbose)
  224                 printf("Table '%.4s' at 0x%jx\n", table->Signature,
  225                     (uintmax_t)address);
  226 
  227         if (strncmp(table->Signature, sig, ACPI_NAME_SIZE) != 0) {
  228                 table_unmap(table, sizeof(ACPI_TABLE_HEADER));
  229                 return (0);
  230         }
  231         table_unmap(table, sizeof(ACPI_TABLE_HEADER));
  232         return (1);
  233 }
  234 
  235 /*
  236  * Try to map a table at a given physical address previously returned
  237  * by acpi_find_table().
  238  */
  239 void *
  240 acpi_map_table(vm_paddr_t pa, const char *sig)
  241 {
  242 
  243         return (map_table(pa, 0, sig));
  244 }
  245 
  246 /* Unmap a table previously mapped via acpi_map_table(). */
  247 void
  248 acpi_unmap_table(void *table)
  249 {
  250         ACPI_TABLE_HEADER *header;
  251 
  252         header = (ACPI_TABLE_HEADER *)table;
  253         table_unmap(table, header->Length);
  254 }
  255 
  256 /*
  257  * Return the physical address of the requested table or zero if one
  258  * is not found.
  259  */
  260 vm_paddr_t
  261 acpi_find_table(const char *sig)
  262 {
  263         ACPI_PHYSICAL_ADDRESS rsdp_ptr;
  264         ACPI_TABLE_RSDP *rsdp;
  265         ACPI_TABLE_RSDT *rsdt;
  266         ACPI_TABLE_XSDT *xsdt;
  267         ACPI_TABLE_HEADER *table;
  268         vm_paddr_t addr;
  269         int i, count;
  270 
  271         if (resource_disabled("acpi", 0))
  272                 return (0);
  273 
  274         /*
  275          * Map in the RSDP.  Since ACPI uses AcpiOsMapMemory() which in turn
  276          * calls pmap_mapbios() to find the RSDP, we assume that we can use
  277          * pmap_mapbios() to map the RSDP.
  278          */
  279         if ((rsdp_ptr = AcpiOsGetRootPointer()) == 0)
  280                 return (0);
  281         rsdp = pmap_mapbios(rsdp_ptr, sizeof(ACPI_TABLE_RSDP));
  282         if (rsdp == NULL) {
  283                 if (bootverbose)
  284                         printf("ACPI: Failed to map RSDP\n");
  285                 return (0);
  286         }
  287 
  288         /*
  289          * For ACPI >= 2.0, use the XSDT if it is available.
  290          * Otherwise, use the RSDT.  We map the XSDT or RSDT at page 2
  291          * in the crashdump area.  Pages 0 and 1 are used to map in the
  292          * headers of candidate ACPI tables.
  293          */
  294         addr = 0;
  295         if (rsdp->Revision >= 2 && rsdp->XsdtPhysicalAddress != 0) {
  296                 /*
  297                  * AcpiOsGetRootPointer only verifies the checksum for
  298                  * the version 1.0 portion of the RSDP.  Version 2.0 has
  299                  * an additional checksum that we verify first.
  300                  */
  301                 if (AcpiTbChecksum((UINT8 *)rsdp, ACPI_RSDP_XCHECKSUM_LENGTH)) {
  302                         if (bootverbose)
  303                                 printf("ACPI: RSDP failed extended checksum\n");
  304                         return (0);
  305                 }
  306                 xsdt = map_table(rsdp->XsdtPhysicalAddress, 2, ACPI_SIG_XSDT);
  307                 if (xsdt == NULL) {
  308                         if (bootverbose)
  309                                 printf("ACPI: Failed to map XSDT\n");
  310                         return (0);
  311                 }
  312                 count = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
  313                     sizeof(UINT64);
  314                 for (i = 0; i < count; i++)
  315                         if (probe_table(xsdt->TableOffsetEntry[i], sig)) {
  316                                 addr = xsdt->TableOffsetEntry[i];
  317                                 break;
  318                         }
  319                 acpi_unmap_table(xsdt);
  320         } else {
  321                 rsdt = map_table(rsdp->RsdtPhysicalAddress, 2, ACPI_SIG_RSDT);
  322                 if (rsdt == NULL) {
  323                         if (bootverbose)
  324                                 printf("ACPI: Failed to map RSDT\n");
  325                         return (0);
  326                 }
  327                 count = (rsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
  328                     sizeof(UINT32);
  329                 for (i = 0; i < count; i++)
  330                         if (probe_table(rsdt->TableOffsetEntry[i], sig)) {
  331                                 addr = rsdt->TableOffsetEntry[i];
  332                                 break;
  333                         }
  334                 acpi_unmap_table(rsdt);
  335         }
  336         pmap_unmapbios((vm_offset_t)rsdp, sizeof(ACPI_TABLE_RSDP));
  337         if (addr == 0) {
  338                 if (bootverbose)
  339                         printf("ACPI: No %s table found\n", sig);
  340                 return (0);
  341         }
  342         if (bootverbose)
  343                 printf("%s: Found table at 0x%jx\n", sig, (uintmax_t)addr);
  344 
  345         /*
  346          * Verify that we can map the full table and that its checksum is
  347          * correct, etc.
  348          */
  349         table = map_table(addr, 0, sig);
  350         if (table == NULL)
  351                 return (0);
  352         acpi_unmap_table(table);
  353 
  354         return (addr);
  355 }
  356 
  357 /*
  358  * ACPI nexus(4) driver.
  359  */
  360 static int
  361 nexus_acpi_probe(device_t dev)
  362 {
  363         int error;
  364 
  365         error = acpi_identify();
  366         if (error)
  367                 return (error);
  368 
  369         return (BUS_PROBE_DEFAULT);
  370 }
  371 
  372 static int
  373 nexus_acpi_attach(device_t dev)
  374 {
  375 
  376         nexus_init_resources();
  377         bus_generic_probe(dev);
  378         if (BUS_ADD_CHILD(dev, 10, "acpi", 0) == NULL)
  379                 panic("failed to add acpi0 device");
  380 
  381         return (bus_generic_attach(dev));
  382 }
  383 
  384 static device_method_t nexus_acpi_methods[] = {
  385         /* Device interface */
  386         DEVMETHOD(device_probe,         nexus_acpi_probe),
  387         DEVMETHOD(device_attach,        nexus_acpi_attach),
  388 
  389         { 0, 0 }
  390 };
  391 
  392 DEFINE_CLASS_1(nexus, nexus_acpi_driver, nexus_acpi_methods, 1, nexus_driver);
  393 static devclass_t nexus_devclass;
  394 
  395 DRIVER_MODULE(nexus_acpi, root, nexus_acpi_driver, nexus_devclass, 0, 0);

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