FreeBSD/Linux Kernel Cross Reference
sys/i386/acpica/acpi_machdep.c

     /*-
      * Copyright (c) 2001 Mitsuru IWASAKI
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/sysctl.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    
    #include <contrib/dev/acpica/include/acpi.h>
    #include <contrib/dev/acpica/include/accommon.h>
    #include <contrib/dev/acpica/include/actables.h>
    
    #include <dev/acpica/acpivar.h>
    
    #include <machine/nexusvar.h>
    
    uint32_t acpi_resume_beep;
    TUNABLE_INT("debug.acpi.resume_beep", &acpi_resume_beep);
    SYSCTL_UINT(_debug_acpi, OID_AUTO, resume_beep, CTLFLAG_RW, &acpi_resume_beep,
        0, "Beep the PC speaker when resuming");
    
    uint32_t acpi_reset_video;
    TUNABLE_INT("hw.acpi.reset_video", &acpi_reset_video);
    
    static int intr_model = ACPI_INTR_PIC;
    
    int
    acpi_machdep_init(device_t dev)
    {
            struct acpi_softc *sc;
    
            sc = device_get_softc(dev);
    
            acpi_apm_init(sc);
            acpi_install_wakeup_handler(sc);
    
            if (intr_model == ACPI_INTR_PIC)
                    BUS_CONFIG_INTR(dev, AcpiGbl_FADT.SciInterrupt,
                        INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
            else
                    acpi_SetIntrModel(intr_model);
    
            SYSCTL_ADD_UINT(&sc->acpi_sysctl_ctx,
                SYSCTL_CHILDREN(sc->acpi_sysctl_tree), OID_AUTO,
                "reset_video", CTLFLAG_RW, &acpi_reset_video, 0,
                "Call the VESA reset BIOS vector on the resume path");
    
            return (0);
    }
    
    void
    acpi_SetDefaultIntrModel(int model)
    {
    
            intr_model = model;
    }
    
    /* Check BIOS date.  If 1998 or older, disable ACPI. */
    int
    acpi_machdep_quirks(int *quirks)
    {
            char *va;
            int year;
    
            /* BIOS address 0xffff5 contains the date in the format mm/dd/yy. */
            va = pmap_mapbios(0xffff0, 16);
            sscanf(va + 11, "%2d", &year);
            pmap_unmapbios((vm_offset_t)va, 16);
    
           /* 
            * Date must be >= 1/1/1999 or we don't trust ACPI.  Note that this
            * check must be changed by my 114th birthday.
            */
           if (year > 90 && year < 99)
                   *quirks = ACPI_Q_BROKEN;
   
           return (0);
   }
   
   void
   acpi_cpu_c1()
   {
   
           __asm __volatile("sti; hlt");
   }
   
   /*
    * Support for mapping ACPI tables during early boot.  This abuses the
    * crashdump map because the kernel cannot allocate KVA in
    * pmap_mapbios() when this is used.  This makes the following
    * assumptions about how we use this KVA: pages 0 and 1 are used to
    * map in the header of each table found via the RSDT or XSDT and
    * pages 2 to n are used to map in the RSDT or XSDT.  This has to use
    * 2 pages for the table headers in case a header spans a page
    * boundary.
    *
    * XXX: We don't ensure the table fits in the available address space
    * in the crashdump map.
    */
   
   /*
    * Map some memory using the crashdump map.  'offset' is an offset in
    * pages into the crashdump map to use for the start of the mapping.
    */
   static void *
   table_map(vm_paddr_t pa, int offset, vm_offset_t length)
   {
           vm_offset_t va, off;
           void *data;
   
           off = pa & PAGE_MASK;
           length = round_page(length + off);
           pa = pa & PG_FRAME;
           va = (vm_offset_t)pmap_kenter_temporary(pa, offset) +
               (offset * PAGE_SIZE);
           data = (void *)(va + off);
           length -= PAGE_SIZE;
           while (length > 0) {
                   va += PAGE_SIZE;
                   pa += PAGE_SIZE;
                   length -= PAGE_SIZE;
                   pmap_kenter(va, pa);
                   invlpg(va);
           }
           return (data);
   }
   
   /* Unmap memory previously mapped with table_map(). */
   static void
   table_unmap(void *data, vm_offset_t length)
   {
           vm_offset_t va, off;
   
           va = (vm_offset_t)data;
           off = va & PAGE_MASK;
           length = round_page(length + off);
           va &= ~PAGE_MASK;
           while (length > 0) {
                   pmap_kremove(va);
                   invlpg(va);
                   va += PAGE_SIZE;
                   length -= PAGE_SIZE;
           }
   }
   
   /*
    * Map a table at a given offset into the crashdump map.  It first
    * maps the header to determine the table length and then maps the
    * entire table.
    */
   static void *
   map_table(vm_paddr_t pa, int offset, const char *sig)
   {
           ACPI_TABLE_HEADER *header;
           vm_offset_t length;
           void *table;
   
           header = table_map(pa, offset, sizeof(ACPI_TABLE_HEADER));
           if (strncmp(header->Signature, sig, ACPI_NAME_SIZE) != 0) {
                   table_unmap(header, sizeof(ACPI_TABLE_HEADER));
                   return (NULL);
           }
           length = header->Length;
           table_unmap(header, sizeof(ACPI_TABLE_HEADER));
           table = table_map(pa, offset, length);
           if (ACPI_FAILURE(AcpiTbChecksum(table, length))) {
                   if (bootverbose)
                           printf("ACPI: Failed checksum for table %s\n", sig);
   #if (ACPI_CHECKSUM_ABORT)
                   table_unmap(table, length);
                   return (NULL);
   #endif
           }
           return (table);
   }
   
   /*
    * See if a given ACPI table is the requested table.  Returns the
    * length of the able if it matches or zero on failure.
    */
   static int
   probe_table(vm_paddr_t address, const char *sig)
   {
           ACPI_TABLE_HEADER *table;
   
           table = table_map(address, 0, sizeof(ACPI_TABLE_HEADER));
           if (table == NULL) {
                   if (bootverbose)
                           printf("ACPI: Failed to map table at 0x%jx\n",
                               (uintmax_t)address);
                   return (0);
           }
           if (bootverbose)
                   printf("Table '%.4s' at 0x%jx\n", table->Signature,
                       (uintmax_t)address);
   
           if (strncmp(table->Signature, sig, ACPI_NAME_SIZE) != 0) {
                   table_unmap(table, sizeof(ACPI_TABLE_HEADER));
                   return (0);
           }
           table_unmap(table, sizeof(ACPI_TABLE_HEADER));
           return (1);
   }
   
   /*
    * Try to map a table at a given physical address previously returned
    * by acpi_find_table().
    */
   void *
   acpi_map_table(vm_paddr_t pa, const char *sig)
   {
   
           return (map_table(pa, 0, sig));
   }
   
   /* Unmap a table previously mapped via acpi_map_table(). */
   void
   acpi_unmap_table(void *table)
   {
           ACPI_TABLE_HEADER *header;
   
           header = (ACPI_TABLE_HEADER *)table;
           table_unmap(table, header->Length);
   }
   
   /*
    * Return the physical address of the requested table or zero if one
    * is not found.
    */
   vm_paddr_t
   acpi_find_table(const char *sig)
   {
           ACPI_PHYSICAL_ADDRESS rsdp_ptr;
           ACPI_TABLE_RSDP *rsdp;
           ACPI_TABLE_RSDT *rsdt;
           ACPI_TABLE_XSDT *xsdt;
           ACPI_TABLE_HEADER *table;
           vm_paddr_t addr;
           int i, count;
   
           if (resource_disabled("acpi", 0))
                   return (0);
   
           /*
            * Map in the RSDP.  Since ACPI uses AcpiOsMapMemory() which in turn
            * calls pmap_mapbios() to find the RSDP, we assume that we can use
            * pmap_mapbios() to map the RSDP.
            */
           if ((rsdp_ptr = AcpiOsGetRootPointer()) == 0)
                   return (0);
           rsdp = pmap_mapbios(rsdp_ptr, sizeof(ACPI_TABLE_RSDP));
           if (rsdp == NULL) {
                   if (bootverbose)
                           printf("ACPI: Failed to map RSDP\n");
                   return (0);
           }
   
           /*
            * For ACPI >= 2.0, use the XSDT if it is available.
            * Otherwise, use the RSDT.  We map the XSDT or RSDT at page 2
            * in the crashdump area.  Pages 0 and 1 are used to map in the
            * headers of candidate ACPI tables.
            */
           addr = 0;
           if (rsdp->Revision >= 2 && rsdp->XsdtPhysicalAddress != 0) {
                   /*
                    * AcpiOsGetRootPointer only verifies the checksum for
                    * the version 1.0 portion of the RSDP.  Version 2.0 has
                    * an additional checksum that we verify first.
                    */
                   if (AcpiTbChecksum((UINT8 *)rsdp, ACPI_RSDP_XCHECKSUM_LENGTH)) {
                           if (bootverbose)
                                   printf("ACPI: RSDP failed extended checksum\n");
                           return (0);
                   }
                   xsdt = map_table(rsdp->XsdtPhysicalAddress, 2, ACPI_SIG_XSDT);
                   if (xsdt == NULL) {
                           if (bootverbose)
                                   printf("ACPI: Failed to map XSDT\n");
                           return (0);
                   }
                   count = (xsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
                       sizeof(UINT64);
                   for (i = 0; i < count; i++)
                           if (probe_table(xsdt->TableOffsetEntry[i], sig)) {
                                   addr = xsdt->TableOffsetEntry[i];
                                   break;
                           }
                   acpi_unmap_table(xsdt);
           } else {
                   rsdt = map_table(rsdp->RsdtPhysicalAddress, 2, ACPI_SIG_RSDT);
                   if (rsdt == NULL) {
                           if (bootverbose)
                                   printf("ACPI: Failed to map RSDT\n");
                           return (0);
                   }
                   count = (rsdt->Header.Length - sizeof(ACPI_TABLE_HEADER)) /
                       sizeof(UINT32);
                   for (i = 0; i < count; i++)
                           if (probe_table(rsdt->TableOffsetEntry[i], sig)) {
                                   addr = rsdt->TableOffsetEntry[i];
                                   break;
                           }
                   acpi_unmap_table(rsdt);
           }
           pmap_unmapbios((vm_offset_t)rsdp, sizeof(ACPI_TABLE_RSDP));
           if (addr == 0) {
                   if (bootverbose)
                           printf("ACPI: No %s table found\n", sig);
                   return (0);
           }
           if (bootverbose)
                   printf("%s: Found table at 0x%jx\n", sig, (uintmax_t)addr);
   
           /*
            * Verify that we can map the full table and that its checksum is
            * correct, etc.
            */
           table = map_table(addr, 0, sig);
           if (table == NULL)
                   return (0);
           acpi_unmap_table(table);
   
           return (addr);
   }
   
   /*
    * ACPI nexus(4) driver.
    */
   static int
   nexus_acpi_probe(device_t dev)
   {
           int error;
   
           error = acpi_identify();
           if (error)
                   return (error);
   
           return (BUS_PROBE_DEFAULT);
   }
   
   static int
   nexus_acpi_attach(device_t dev)
   {
   
           nexus_init_resources();
           bus_generic_probe(dev);
           if (BUS_ADD_CHILD(dev, 10, "acpi", 0) == NULL)
                   panic("failed to add acpi0 device");
   
           return (bus_generic_attach(dev));
   }
   
   static device_method_t nexus_acpi_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         nexus_acpi_probe),
           DEVMETHOD(device_attach,        nexus_acpi_attach),
   
           { 0, 0 }
   };
   
   DEFINE_CLASS_1(nexus, nexus_acpi_driver, nexus_acpi_methods, 1, nexus_driver);
   static devclass_t nexus_devclass;
   
   DRIVER_MODULE(nexus_acpi, root, nexus_acpi_driver, nexus_devclass, 0, 0);

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