FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/Osd/OsdHardware.c

     /*-
      * Copyright (c) 2000, 2001 Michael Smith
      * Copyright (c) 2000 BSDi
      * 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.
     */
    
    /*
     * 6.7 : Hardware Abstraction
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <contrib/dev/acpica/acpi.h>
    
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <machine/bus.h>
    #include <machine/pci_cfgreg.h>
    #include <dev/acpica/acpivar.h>
    #include <dev/pci/pcireg.h>
    
    /*
     * ACPICA's rather gung-ho approach to hardware resource ownership is a little
     * troublesome insofar as there is no easy way for us to know in advance
     * exactly which I/O resources it's going to want to use.
     *
     * In order to deal with this, we ignore resource ownership entirely, and simply
     * use the native I/O space accessor functionality.  This is Evil, but it works.
     *
     * XXX use an intermediate #define for the tag/handle
     */
    
    #ifdef __i386__
    #define ACPI_BUS_SPACE_IO       I386_BUS_SPACE_IO
    #define ACPI_BUS_HANDLE         0
    #endif
    #ifdef __ia64__
    #define ACPI_BUS_SPACE_IO       IA64_BUS_SPACE_IO
    #define ACPI_BUS_HANDLE         0
    #endif
    #ifdef __amd64__
    #define ACPI_BUS_SPACE_IO       AMD64_BUS_SPACE_IO
    #define ACPI_BUS_HANDLE         0
    #endif
    
    /*
     * Some BIOS vendors use AML to read/write directly to IO space.  This
     * can cause a problem if such accesses interfere with the OS's access to
     * the same ports.  Windows XP and newer systems block accesses to certain
     * IO ports.  We print a message or block accesses based on a tunable.
     */
    static int illegal_bios_ports[] = {
            0x000, 0x00f,   /* DMA controller 1 */
            0x020, 0x021,   /* PIC */
            0x040, 0x043,   /* Timer 1 */
            0x048, 0x04b,   /* Timer 2 failsafe */
            0x070, 0x071,   /* CMOS and RTC */
            0x074, 0x076,   /* Extended CMOS */
            0x081, 0x083,   /* DMA1 page registers */
            0x087, 0x087,   /* DMA1 ch0 low page */
            0x089, 0x08b,   /* DMA2 ch2 (0x89), ch3 low page (0x8a, 0x8b) */
            0x08f, 0x091,   /* DMA2 low page refresh (0x8f) */
                            /* Arb ctrl port, card select feedback (0x90, 0x91) */
            0x093, 0x094,   /* System board setup */
            0x096, 0x097,   /* POS channel select */
            0x0a0, 0x0a1,   /* PIC (cascaded) */
            0x0c0, 0x0df,   /* ISA DMA */
            0x4d0, 0x4d1,   /* PIC ELCR (edge/level control) */
            0xcf8, 0xcff,   /* PCI config space. Microsoft adds 0xd00 also but
                               that seems incorrect. */
            -1, -1
    };
    
    /* Block accesses to bad IO port addresses or just print a warning. */
    static int block_bad_io;
    TUNABLE_INT("debug.acpi.block_bad_io", &block_bad_io);
    
   /*
    * Look up bad ports in our table.  Returns 0 if ok, 1 if marked bad but
    * access is still allowed, or -1 to deny access.
    */
   static int
   acpi_os_check_port(UINT32 addr, UINT32 width)
   {
           int error, *port;
   
           error = 0;
           for (port = illegal_bios_ports; *port != -1; port += 2) {
                   if ((addr >= port[0] && addr <= port[1]) ||
                       (addr < port[0] && addr + (width / 8) > port[0])) {
                           if (block_bad_io)
                               error = -1;
                           else
                               error = 1;
                           break;
                   }
           }
   
           return (error);
   }
   
   ACPI_STATUS
   AcpiOsReadPort(ACPI_IO_ADDRESS InPort, UINT32 *Value, UINT32 Width)
   {
       int error;
   
       error = acpi_os_check_port(InPort, Width);
       if (error != 0) {
           if (bootverbose)
                   printf("acpi: bad read from port 0x%03x (%d)\n",
                           (int)InPort, Width);
           if (error == -1)
               return (AE_BAD_PARAMETER);
       }
   
       switch (Width) {
       case 8:
           *(u_int8_t *)Value = bus_space_read_1(ACPI_BUS_SPACE_IO,
               ACPI_BUS_HANDLE, InPort);
           break;
       case 16:
           *(u_int16_t *)Value = bus_space_read_2(ACPI_BUS_SPACE_IO,
               ACPI_BUS_HANDLE, InPort);
           break;
       case 32:
           *(u_int32_t *)Value = bus_space_read_4(ACPI_BUS_SPACE_IO,
               ACPI_BUS_HANDLE, InPort);
           break;
       default:
           /* debug trap goes here */
           break;
       }
   
       return (AE_OK);
   }
   
   ACPI_STATUS
   AcpiOsWritePort(ACPI_IO_ADDRESS OutPort, UINT32 Value, UINT32 Width)
   {
       int error;
   
       error = acpi_os_check_port(OutPort, Width);
       if (error != 0) {
           if (bootverbose)
                   printf("acpi: bad write to port 0x%03x (%d), val %#x\n",
                           (int)OutPort, Width, Value);
           if (error == -1)
               return (AE_BAD_PARAMETER);
       }
   
       switch (Width) {
       case 8:
           bus_space_write_1(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value);
           break;
       case 16:
           bus_space_write_2(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value);
           break;
       case 32:
           bus_space_write_4(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value);
           break;
       default:
           /* debug trap goes here */
           break;
       }
   
       return (AE_OK);
   }
   
   ACPI_STATUS
   AcpiOsReadPciConfiguration(ACPI_PCI_ID *PciId, UINT32 Register, void *Value,
       UINT32 Width)
   {
       u_int32_t   byte_width = Width / 8;
       u_int32_t   val;
   
       if (!pci_cfgregopen())
           return (AE_NOT_EXIST);
   
       val = pci_cfgregread(PciId->Bus, PciId->Device, PciId->Function, Register,
           byte_width);
       switch (Width) {
       case 8:
           *(u_int8_t *)Value = val & 0xff;
           break;
       case 16:
           *(u_int16_t *)Value = val & 0xffff;
           break;
       case 32:
           *(u_int32_t *)Value = val;
           break;
       default:
           /* debug trap goes here */
           break;
       }
   
       return (AE_OK);
   }
   
   
   ACPI_STATUS
   AcpiOsWritePciConfiguration (ACPI_PCI_ID *PciId, UINT32 Register,
       ACPI_INTEGER Value, UINT32 Width)
   {
       u_int32_t   byte_width = Width / 8;
   
       if (!pci_cfgregopen())
           return (AE_NOT_EXIST);
   
       pci_cfgregwrite(PciId->Bus, PciId->Device, PciId->Function, Register,
           Value, byte_width);
   
       return (AE_OK);
   }
   
   /*
    * Depth-first recursive case for finding the bus, given the slot/function.
    */
   static int
   acpi_bus_number(ACPI_HANDLE root, ACPI_HANDLE curr, ACPI_PCI_ID *PciId)
   {
       ACPI_HANDLE parent;
       ACPI_STATUS status;
       ACPI_OBJECT_TYPE type;
       UINT32 adr;
       int bus, slot, func, class, subclass, header;
   
       /* Try to get the _BBN object of the root, otherwise assume it is 0. */
       bus = 0;
       if (root == curr) {
           status = acpi_GetInteger(root, "_BBN", &bus);
           if (ACPI_FAILURE(status) && bootverbose)
               printf("acpi_bus_number: root bus has no _BBN, assuming 0\n");
           return (bus);
       }
       status = AcpiGetParent(curr, &parent);
       if (ACPI_FAILURE(status))
           return (bus);
   
       /* First, recurse up the tree until we find the host bus. */
       bus = acpi_bus_number(root, parent, PciId);
   
       /* Validate parent bus device type. */
       if (ACPI_FAILURE(AcpiGetType(parent, &type)) || type != ACPI_TYPE_DEVICE) {
           printf("acpi_bus_number: not a device, type %d\n", type);
           return (bus);
       }
   
       /* Get the parent's slot and function. */
       status = acpi_GetInteger(parent, "_ADR", &adr);
       if (ACPI_FAILURE(status))
           return (bus);
       slot = ACPI_HIWORD(adr);
       func = ACPI_LOWORD(adr);
   
       /* Is this a PCI-PCI or Cardbus-PCI bridge? */
       class = pci_cfgregread(bus, slot, func, PCIR_CLASS, 1);
       if (class != PCIC_BRIDGE)
           return (bus);
       subclass = pci_cfgregread(bus, slot, func, PCIR_SUBCLASS, 1);
   
       /* Find the header type, masking off the multifunction bit. */
       header = pci_cfgregread(bus, slot, func, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE;
       if (header == PCIM_HDRTYPE_BRIDGE && subclass == PCIS_BRIDGE_PCI)
           bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_1, 1);
       else if (header == PCIM_HDRTYPE_CARDBUS && subclass == PCIS_BRIDGE_CARDBUS)
           bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_2, 1);
       return (bus);
   }
   
   /*
    * Find the bus number for a device
    *
    * rhandle: handle for the root bus
    * chandle: handle for the device
    * PciId: pointer to device slot and function, we fill out bus
    */
   void
   AcpiOsDerivePciId(ACPI_HANDLE rhandle, ACPI_HANDLE chandle, ACPI_PCI_ID **PciId)
   {
       ACPI_HANDLE parent;
       ACPI_STATUS status;
       int bus;
   
       if (pci_cfgregopen() == 0)
           panic("AcpiOsDerivePciId unable to initialize pci bus");
   
       /* Try to read _BBN for bus number if we're at the root */
       bus = 0;
       if (rhandle == chandle) {
           status = acpi_GetInteger(rhandle, "_BBN", &bus);
           if (ACPI_FAILURE(status) && bootverbose)
               printf("AcpiOsDerivePciId: root bus has no _BBN, assuming 0\n");
       }
   
       /*
        * Get the parent handle and call the recursive case.  It is not
        * clear why we seem to be getting a chandle that points to a child
        * of the desired slot/function but passing in the parent handle
        * here works.
        */
       if (ACPI_SUCCESS(AcpiGetParent(chandle, &parent)))
           bus = acpi_bus_number(rhandle, parent, *PciId);
       (*PciId)->Bus = bus;
       if (bootverbose) {
           printf("AcpiOsDerivePciId: %s -> bus %d dev %d func %d\n",
               acpi_name(chandle), (*PciId)->Bus, (*PciId)->Device,
               (*PciId)->Function);
       }
   }

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