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/11.1/sys/i386/acpica/acpi_machdep.c 282678 2015-05-09 12:28:48Z kib $");
   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 SYSCTL_UINT(_debug_acpi, OID_AUTO, resume_beep, CTLFLAG_RWTUN, &acpi_resume_beep,
   49     0, "Beep the PC speaker when resuming");
   50 
   51 uint32_t acpi_reset_video;
   52 TUNABLE_INT("hw.acpi.reset_video", &acpi_reset_video);
   53 
   54 static int intr_model = ACPI_INTR_PIC;
   55 
   56 int
   57 acpi_machdep_init(device_t dev)
   58 {
   59         struct acpi_softc *sc;
   60 
   61         sc = device_get_softc(dev);
   62 
   63         acpi_apm_init(sc);
   64         acpi_install_wakeup_handler(sc);
   65 
   66         if (intr_model == ACPI_INTR_PIC)
   67                 BUS_CONFIG_INTR(dev, AcpiGbl_FADT.SciInterrupt,
   68                     INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
   69         else
   70                 acpi_SetIntrModel(intr_model);
   71 
   72         SYSCTL_ADD_UINT(&sc->acpi_sysctl_ctx,
   73             SYSCTL_CHILDREN(sc->acpi_sysctl_tree), OID_AUTO,
   74             "reset_video", CTLFLAG_RW, &acpi_reset_video, 0,
   75             "Call the VESA reset BIOS vector on the resume path");
   76 
   77         return (0);
   78 }
   79 
   80 void
   81 acpi_SetDefaultIntrModel(int model)
   82 {
   83 
   84         intr_model = model;
   85 }
   86 
   87 /* Check BIOS date.  If 1998 or older, disable ACPI. */
   88 int
   89 acpi_machdep_quirks(int *quirks)
   90 {
   91         char *va;
   92         int year;
   93 
   94         /* BIOS address 0xffff5 contains the date in the format mm/dd/yy. */
   95         va = pmap_mapbios(0xffff0, 16);
   96         sscanf(va + 11, "%2d", &year);
   97         pmap_unmapbios((vm_offset_t)va, 16);
   98 
   99         /* 
  100          * Date must be >= 1/1/1999 or we don't trust ACPI.  Note that this
  101          * check must be changed by my 114th birthday.
  102          */
  103         if (year > 90 && year < 99)
  104                 *quirks = ACPI_Q_BROKEN;
  105 
  106         return (0);
  107 }
  108 
  109 /*
  110  * Support for mapping ACPI tables during early boot.  This abuses the
  111  * crashdump map because the kernel cannot allocate KVA in
  112  * pmap_mapbios() when this is used.  This makes the following
  113  * assumptions about how we use this KVA: pages 0 and 1 are used to
  114  * map in the header of each table found via the RSDT or XSDT and
  115  * pages 2 to n are used to map in the RSDT or XSDT.  This has to use
  116  * 2 pages for the table headers in case a header spans a page
  117  * boundary.
  118  *
  119  * XXX: We don't ensure the table fits in the available address space
  120  * in the crashdump map.
  121  */
  122 
  123 /*
  124  * Map some memory using the crashdump map.  'offset' is an offset in
  125  * pages into the crashdump map to use for the start of the mapping.
  126  */
  127 static void *
  128 table_map(vm_paddr_t pa, int offset, vm_offset_t length)
  129 {
  130         vm_offset_t va, off;
  131         void *data;
  132 
  133         off = pa & PAGE_MASK;
  134         length = round_page(length + off);
  135         pa = pa & PG_FRAME;
  136         va = (vm_offset_t)pmap_kenter_temporary(pa, offset) +
  137             (offset * PAGE_SIZE);
  138         data = (void *)(va + off);
  139         length -= PAGE_SIZE;
  140         while (length > 0) {
  141                 va += PAGE_SIZE;
  142                 pa += PAGE_SIZE;
  143                 length -= PAGE_SIZE;
  144                 pmap_kenter(va, pa);
  145                 invlpg(va);
  146         }
  147         return (data);
  148 }
  149 
  150 /* Unmap memory previously mapped with table_map(). */
  151 static void
  152 table_unmap(void *data, vm_offset_t length)
  153 {
  154         vm_offset_t va, off;
  155 
  156         va = (vm_offset_t)data;
  157         off = va & PAGE_MASK;
  158         length = round_page(length + off);
  159         va &= ~PAGE_MASK;
  160         while (length > 0) {
  161                 pmap_kremove(va);
  162                 invlpg(va);
  163                 va += PAGE_SIZE;
  164                 length -= PAGE_SIZE;
  165         }
  166 }
  167 
  168 /*
  169  * Map a table at a given offset into the crashdump map.  It first
  170  * maps the header to determine the table length and then maps the
  171  * entire table.
  172  */
  173 static void *
  174 map_table(vm_paddr_t pa, int offset, const char *sig)
  175 {
  176         ACPI_TABLE_HEADER *header;
  177         vm_offset_t length;
  178         void *table;
  179 
  180         header = table_map(pa, offset, sizeof(ACPI_TABLE_HEADER));
  181         if (strncmp(header->Signature, sig, ACPI_NAME_SIZE) != 0) {
  182                 table_unmap(header, sizeof(ACPI_TABLE_HEADER));
  183                 return (NULL);
  184         }
  185         length = header->Length;
  186         table_unmap(header, sizeof(ACPI_TABLE_HEADER));
  187         table = table_map(pa, offset, length);
  188         if (ACPI_FAILURE(AcpiTbChecksum(table, length))) {
  189                 if (bootverbose)
  190                         printf("ACPI: Failed checksum for table %s\n", sig);
  191 #if (ACPI_CHECKSUM_ABORT)
  192                 table_unmap(table, length);
  193                 return (NULL);
  194 #endif
  195         }
  196         return (table);
  197 }
  198 
  199 /*
  200  * See if a given ACPI table is the requested table.  Returns the
  201  * length of the able if it matches or zero on failure.
  202  */
  203 static int
  204 probe_table(vm_paddr_t address, const char *sig)
  205 {
  206         ACPI_TABLE_HEADER *table;
  207 
  208         table = table_map(address, 0, sizeof(ACPI_TABLE_HEADER));
  209         if (table == NULL) {
  210                 if (bootverbose)
  211                         printf("ACPI: Failed to map table at 0x%jx\n",
  212                             (uintmax_t)address);
  213                 return (0);
  214         }
  215         if (bootverbose)
  216                 printf("Table '%.4s' at 0x%jx\n", table->Signature,
  217                     (uintmax_t)address);
  218 
  219         if (strncmp(table->Signature, sig, ACPI_NAME_SIZE) != 0) {
  220                 table_unmap(table, sizeof(ACPI_TABLE_HEADER));
  221                 return (0);
  222         }
  223         table_unmap(table, sizeof(ACPI_TABLE_HEADER));
  224         return (1);
  225 }
  226 
  227 /*
  228  * Try to map a table at a given physical address previously returned
  229  * by acpi_find_table().
  230  */
  231 void *
  232 acpi_map_table(vm_paddr_t pa, const char *sig)
  233 {
  234 
  235         return (map_table(pa, 0, sig));
  236 }
  237 
  238 /* Unmap a table previously mapped via acpi_map_table(). */
  239 void
  240 acpi_unmap_table(void *table)
  241 {
  242         ACPI_TABLE_HEADER *header;
  243 
  244         header = (ACPI_TABLE_HEADER *)table;
  245         table_unmap(table, header->Length);
  246 }
  247 
  248 /*
  249  * Return the physical address of the requested table or zero if one
  250  * is not found.
  251  */
  252 vm_paddr_t
  253 acpi_find_table(const char *sig)
  254 {
  255         ACPI_PHYSICAL_ADDRESS rsdp_ptr;
  256         ACPI_TABLE_RSDP *rsdp;
  257         ACPI_TABLE_RSDT *rsdt;
  258         ACPI_TABLE_XSDT *xsdt;
  259         ACPI_TABLE_HEADER *table;
  260         vm_paddr_t addr;
  261         int i, count;
  262 
  263         if (resource_disabled("acpi", 0))
  264                 return (0);
  265 
  266         /*
  267          * Map in the RSDP.  Since ACPI uses AcpiOsMapMemory() which in turn
  268          * calls pmap_mapbios() to find the RSDP, we assume that we can use
  269          * pmap_mapbios() to map the RSDP.
  270          */
  271         if ((rsdp_ptr = AcpiOsGetRootPointer()) == 0)
  272                 return (0);
  273         rsdp = pmap_mapbios(rsdp_ptr, sizeof(ACPI_TABLE_RSDP));
  274         if (rsdp == NULL) {
  275                 if (bootverbose)
  276                         printf("ACPI: Failed to map RSDP\n");
  277                 return (0);
  278         }
  279 
  280         /*
  281          * For ACPI >= 2.0, use the XSDT if it is available.
  282          * Otherwise, use the RSDT.  We map the XSDT or RSDT at page 2
  283          * in the crashdump area.  Pages 0 and 1 are used to map in the
  284          * headers of candidate ACPI tables.
  285          */
  286         addr = 0;
  287         if (rsdp->Revision >= 2 && rsdp->XsdtPhysicalAddress != 0) {
  288                 /*
  289                  * AcpiOsGetRootPointer only verifies the checksum for
  290                  * the version 1.0 portion of the RSDP.  Version 2.0 has
  291                  * an additional checksum that we verify first.
  292                  */
  293                 if (AcpiTbChecksum((UINT8 *)rsdp, ACPI_RSDP_XCHECKSUM_LENGTH)) {
  294                         if (bootverbose)
  295                                 printf("ACPI: RSDP failed extended checksum\n");
  296                         return (0);
  297                 }
  298                 xsdt = map_table(rsdp->XsdtPhysicalAddress, 2, ACPI_SIG_XSDT);
  299                 if (xsdt == NULL) {
  300                         if (bootverbose)
  301                                 printf("ACPI: Failed to map XSDT\n");
  302                         return (0);
  303                 }
  304                 count = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
  305                     sizeof(UINT64);
  306                 for (i = 0; i < count; i++)
  307                         if (probe_table(xsdt->TableOffsetEntry[i], sig)) {
  308                                 addr = xsdt->TableOffsetEntry[i];
  309                                 break;
  310                         }
  311                 acpi_unmap_table(xsdt);
  312         } else {
  313                 rsdt = map_table(rsdp->RsdtPhysicalAddress, 2, ACPI_SIG_RSDT);
  314                 if (rsdt == NULL) {
  315                         if (bootverbose)
  316                                 printf("ACPI: Failed to map RSDT\n");
  317                         return (0);
  318                 }
  319                 count = (rsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
  320                     sizeof(UINT32);
  321                 for (i = 0; i < count; i++)
  322                         if (probe_table(rsdt->TableOffsetEntry[i], sig)) {
  323                                 addr = rsdt->TableOffsetEntry[i];
  324                                 break;
  325                         }
  326                 acpi_unmap_table(rsdt);
  327         }
  328         pmap_unmapbios((vm_offset_t)rsdp, sizeof(ACPI_TABLE_RSDP));
  329         if (addr == 0) {
  330                 if (bootverbose)
  331                         printf("ACPI: No %s table found\n", sig);
  332                 return (0);
  333         }
  334         if (bootverbose)
  335                 printf("%s: Found table at 0x%jx\n", sig, (uintmax_t)addr);
  336 
  337         /*
  338          * Verify that we can map the full table and that its checksum is
  339          * correct, etc.
  340          */
  341         table = map_table(addr, 0, sig);
  342         if (table == NULL)
  343                 return (0);
  344         acpi_unmap_table(table);
  345 
  346         return (addr);
  347 }
  348 
  349 /*
  350  * ACPI nexus(4) driver.
  351  */
  352 static int
  353 nexus_acpi_probe(device_t dev)
  354 {
  355         int error;
  356 
  357         error = acpi_identify();
  358         if (error)
  359                 return (error);
  360 
  361         return (BUS_PROBE_DEFAULT);
  362 }
  363 
  364 static int
  365 nexus_acpi_attach(device_t dev)
  366 {
  367 
  368         nexus_init_resources();
  369         bus_generic_probe(dev);
  370         if (BUS_ADD_CHILD(dev, 10, "acpi", 0) == NULL)
  371                 panic("failed to add acpi0 device");
  372 
  373         return (bus_generic_attach(dev));
  374 }
  375 
  376 static device_method_t nexus_acpi_methods[] = {
  377         /* Device interface */
  378         DEVMETHOD(device_probe,         nexus_acpi_probe),
  379         DEVMETHOD(device_attach,        nexus_acpi_attach),
  380 
  381         { 0, 0 }
  382 };
  383 
  384 DEFINE_CLASS_1(nexus, nexus_acpi_driver, nexus_acpi_methods, 1, nexus_driver);
  385 static devclass_t nexus_devclass;
  386 
  387 DRIVER_MODULE(nexus_acpi, root, nexus_acpi_driver, nexus_devclass, 0, 0);

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