Logo Search packages:      
Sourcecode: linux version File versions  Download package

osl.c

/*
 *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
 *
 *  Copyright (C) 2000       Andrew Henroid
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/kmod.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/workqueue.h>
#include <linux/nmi.h>
#include <linux/acpi.h>
#include <acpi/acpi.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/processor.h>
#include <asm/uaccess.h>

#include <linux/efi.h>

#define _COMPONENT            ACPI_OS_SERVICES
ACPI_MODULE_NAME("osl");
#define PREFIX          "ACPI: "
struct acpi_os_dpc {
      acpi_osd_exec_callback function;
      void *context;
      struct work_struct work;
};

#ifdef CONFIG_ACPI_CUSTOM_DSDT
#include CONFIG_ACPI_CUSTOM_DSDT_FILE
#endif

#ifdef ENABLE_DEBUGGER
#include <linux/kdb.h>

/* stuff for debugger support */
int acpi_in_debugger;
EXPORT_SYMBOL(acpi_in_debugger);

extern char line_buf[80];
#endif                        /*ENABLE_DEBUGGER */

static unsigned int acpi_irq_irq;
static acpi_osd_handler acpi_irq_handler;
static void *acpi_irq_context;
static struct workqueue_struct *kacpid_wq;
static struct workqueue_struct *kacpi_notify_wq;

#define     OSI_STRING_LENGTH_MAX 64      /* arbitrary */
static char osi_additional_string[OSI_STRING_LENGTH_MAX];

/*
 * "Ode to _OSI(Linux)"
 *
 * osi_linux -- Control response to BIOS _OSI(Linux) query.
 *
 * As Linux evolves, the features that it supports change.
 * So an OSI string such as "Linux" is not specific enough
 * to be useful across multiple versions of Linux.  It
 * doesn't identify any particular feature, interface,
 * or even any particular version of Linux...
 *
 * Unfortunately, Linux-2.6.22 and earlier responded "yes"
 * to a BIOS _OSI(Linux) query.  When
 * a reference mobile BIOS started using it, its use
 * started to spread to many vendor platforms.
 * As it is not supportable, we need to halt that spread.
 *
 * Today, most BIOS references to _OSI(Linux) are noise --
 * they have no functional effect and are just dead code
 * carried over from the reference BIOS.
 *
 * The next most common case is that _OSI(Linux) harms Linux,
 * usually by causing the BIOS to follow paths that are
 * not tested during Windows validation.
 *
 * Finally, there is a short list of platforms
 * where OSI(Linux) benefits Linux.
 *
 * In Linux-2.6.23, OSI(Linux) is first disabled by default.
 * DMI is used to disable the dmesg warning about OSI(Linux)
 * on platforms where it is known to have no effect.
 * But a dmesg warning remains for systems where
 * we do not know if OSI(Linux) is good or bad for the system.
 * DMI is also used to enable OSI(Linux) for the machines
 * that are known to need it.
 *
 * BIOS writers should NOT query _OSI(Linux) on future systems.
 * It will be ignored by default, and to get Linux to
 * not ignore it will require a kernel source update to
 * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
 */
#define OSI_LINUX_ENABLE 0

static struct osi_linux {
      unsigned int      enable:1;
      unsigned int      dmi:1;
      unsigned int      cmdline:1;
      unsigned int      known:1;
} osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0};

static void __init acpi_request_region (struct acpi_generic_address *addr,
      unsigned int length, char *desc)
{
      struct resource *res;

      if (!addr->address || !length)
            return;

      if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
            res = request_region(addr->address, length, desc);
      else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
            res = request_mem_region(addr->address, length, desc);
}

static int __init acpi_reserve_resources(void)
{
      acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
            "ACPI PM1a_EVT_BLK");

      acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
            "ACPI PM1b_EVT_BLK");

      acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
            "ACPI PM1a_CNT_BLK");

      acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
            "ACPI PM1b_CNT_BLK");

      if (acpi_gbl_FADT.pm_timer_length == 4)
            acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");

      acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
            "ACPI PM2_CNT_BLK");

      /* Length of GPE blocks must be a non-negative multiple of 2 */

      if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
            acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
                         acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");

      if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
            acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
                         acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");

      return 0;
}
device_initcall(acpi_reserve_resources);

acpi_status __init acpi_os_initialize(void)
{
      return AE_OK;
}

acpi_status acpi_os_initialize1(void)
{
      /*
       * Initialize PCI configuration space access, as we'll need to access
       * it while walking the namespace (bus 0 and root bridges w/ _BBNs).
       */
      if (!raw_pci_ops) {
            printk(KERN_ERR PREFIX
                   "Access to PCI configuration space unavailable\n");
            return AE_NULL_ENTRY;
      }
      kacpid_wq = create_singlethread_workqueue("kacpid");
      kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
      BUG_ON(!kacpid_wq);
      BUG_ON(!kacpi_notify_wq);
      return AE_OK;
}

acpi_status acpi_os_terminate(void)
{
      if (acpi_irq_handler) {
            acpi_os_remove_interrupt_handler(acpi_irq_irq,
                                     acpi_irq_handler);
      }

      destroy_workqueue(kacpid_wq);
      destroy_workqueue(kacpi_notify_wq);

      return AE_OK;
}

void acpi_os_printf(const char *fmt, ...)
{
      va_list args;
      va_start(args, fmt);
      acpi_os_vprintf(fmt, args);
      va_end(args);
}

EXPORT_SYMBOL(acpi_os_printf);

void acpi_os_vprintf(const char *fmt, va_list args)
{
      static char buffer[512];

      vsprintf(buffer, fmt, args);

#ifdef ENABLE_DEBUGGER
      if (acpi_in_debugger) {
            kdb_printf("%s", buffer);
      } else {
            printk("%s", buffer);
      }
#else
      printk("%s", buffer);
#endif
}

acpi_physical_address __init acpi_os_get_root_pointer(void)
{
      if (efi_enabled) {
            if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
                  return efi.acpi20;
            else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
                  return efi.acpi;
            else {
                  printk(KERN_ERR PREFIX
                         "System description tables not found\n");
                  return 0;
            }
      } else
            return acpi_find_rsdp();
}

void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
{
      if (phys > ULONG_MAX) {
            printk(KERN_ERR PREFIX "Cannot map memory that high\n");
            return NULL;
      }
      if (acpi_gbl_permanent_mmap)
            /*
            * ioremap checks to ensure this is in reserved space
            */
            return ioremap((unsigned long)phys, size);
      else
            return __acpi_map_table((unsigned long)phys, size);
}
EXPORT_SYMBOL_GPL(acpi_os_map_memory);

void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
{
      if (acpi_gbl_permanent_mmap) {
            iounmap(virt);
      }
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);

#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
{
      if (!phys || !virt)
            return AE_BAD_PARAMETER;

      *phys = virt_to_phys(virt);

      return AE_OK;
}
#endif

#define ACPI_MAX_OVERRIDE_LEN 100

static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];

acpi_status
acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
                      acpi_string * new_val)
{
      if (!init_val || !new_val)
            return AE_BAD_PARAMETER;

      *new_val = NULL;
      if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
            printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
                   acpi_os_name);
            *new_val = acpi_os_name;
      }

      return AE_OK;
}

acpi_status
acpi_os_table_override(struct acpi_table_header * existing_table,
                   struct acpi_table_header ** new_table)
{
      if (!existing_table || !new_table)
            return AE_BAD_PARAMETER;

#ifdef CONFIG_ACPI_CUSTOM_DSDT
      if (strncmp(existing_table->signature, "DSDT", 4) == 0)
            *new_table = (struct acpi_table_header *)AmlCode;
      else
            *new_table = NULL;
#else
      *new_table = NULL;
#endif
      return AE_OK;
}

static irqreturn_t acpi_irq(int irq, void *dev_id)
{
      return (*acpi_irq_handler) (acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
}

acpi_status
acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
                          void *context)
{
      unsigned int irq;

      /*
       * Ignore the GSI from the core, and use the value in our copy of the
       * FADT. It may not be the same if an interrupt source override exists
       * for the SCI.
       */
      gsi = acpi_gbl_FADT.sci_interrupt;
      if (acpi_gsi_to_irq(gsi, &irq) < 0) {
            printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
                   gsi);
            return AE_OK;
      }

      acpi_irq_handler = handler;
      acpi_irq_context = context;
      if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
            printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
            return AE_NOT_ACQUIRED;
      }
      acpi_irq_irq = irq;

      return AE_OK;
}

acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
{
      if (irq) {
            free_irq(irq, acpi_irq);
            acpi_irq_handler = NULL;
            acpi_irq_irq = 0;
      }

      return AE_OK;
}

/*
 * Running in interpreter thread context, safe to sleep
 */

void acpi_os_sleep(acpi_integer ms)
{
      schedule_timeout_interruptible(msecs_to_jiffies(ms));
}

EXPORT_SYMBOL(acpi_os_sleep);

void acpi_os_stall(u32 us)
{
      while (us) {
            u32 delay = 1000;

            if (delay > us)
                  delay = us;
            udelay(delay);
            touch_nmi_watchdog();
            us -= delay;
      }
}

EXPORT_SYMBOL(acpi_os_stall);

/*
 * Support ACPI 3.0 AML Timer operand
 * Returns 64-bit free-running, monotonically increasing timer
 * with 100ns granularity
 */
u64 acpi_os_get_timer(void)
{
      static u64 t;

#ifdef      CONFIG_HPET
      /* TBD: use HPET if available */
#endif

#ifdef      CONFIG_X86_PM_TIMER
      /* TBD: default to PM timer if HPET was not available */
#endif
      if (!t)
            printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");

      return ++t;
}

acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
{
      u32 dummy;

      if (!value)
            value = &dummy;

      *value = 0;
      if (width <= 8) {
            *(u8 *) value = inb(port);
      } else if (width <= 16) {
            *(u16 *) value = inw(port);
      } else if (width <= 32) {
            *(u32 *) value = inl(port);
      } else {
            BUG();
      }

      return AE_OK;
}

EXPORT_SYMBOL(acpi_os_read_port);

acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
{
      if (width <= 8) {
            outb(value, port);
      } else if (width <= 16) {
            outw(value, port);
      } else if (width <= 32) {
            outl(value, port);
      } else {
            BUG();
      }

      return AE_OK;
}

EXPORT_SYMBOL(acpi_os_write_port);

acpi_status
acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
{
      u32 dummy;
      void __iomem *virt_addr;

      virt_addr = ioremap(phys_addr, width);
      if (!value)
            value = &dummy;

      switch (width) {
      case 8:
            *(u8 *) value = readb(virt_addr);
            break;
      case 16:
            *(u16 *) value = readw(virt_addr);
            break;
      case 32:
            *(u32 *) value = readl(virt_addr);
            break;
      default:
            BUG();
      }

      iounmap(virt_addr);

      return AE_OK;
}

acpi_status
acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
{
      void __iomem *virt_addr;

      virt_addr = ioremap(phys_addr, width);

      switch (width) {
      case 8:
            writeb(value, virt_addr);
            break;
      case 16:
            writew(value, virt_addr);
            break;
      case 32:
            writel(value, virt_addr);
            break;
      default:
            BUG();
      }

      iounmap(virt_addr);

      return AE_OK;
}

acpi_status
acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
                         void *value, u32 width)
{
      int result, size;

      if (!value)
            return AE_BAD_PARAMETER;

      switch (width) {
      case 8:
            size = 1;
            break;
      case 16:
            size = 2;
            break;
      case 32:
            size = 4;
            break;
      default:
            return AE_ERROR;
      }

      BUG_ON(!raw_pci_ops);

      result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
                           PCI_DEVFN(pci_id->device, pci_id->function),
                           reg, size, value);

      return (result ? AE_ERROR : AE_OK);
}

EXPORT_SYMBOL(acpi_os_read_pci_configuration);

acpi_status
acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
                        acpi_integer value, u32 width)
{
      int result, size;

      switch (width) {
      case 8:
            size = 1;
            break;
      case 16:
            size = 2;
            break;
      case 32:
            size = 4;
            break;
      default:
            return AE_ERROR;
      }

      BUG_ON(!raw_pci_ops);

      result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
                            PCI_DEVFN(pci_id->device, pci_id->function),
                            reg, size, value);

      return (result ? AE_ERROR : AE_OK);
}

/* TODO: Change code to take advantage of driver model more */
static void acpi_os_derive_pci_id_2(acpi_handle rhandle,    /* upper bound  */
                            acpi_handle chandle,      /* current node */
                            struct acpi_pci_id **id,
                            int *is_bridge, u8 * bus_number)
{
      acpi_handle handle;
      struct acpi_pci_id *pci_id = *id;
      acpi_status status;
      unsigned long temp;
      acpi_object_type type;
      u8 tu8;

      acpi_get_parent(chandle, &handle);
      if (handle != rhandle) {
            acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
                              bus_number);

            status = acpi_get_type(handle, &type);
            if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
                  return;

            status =
                acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
                                &temp);
            if (ACPI_SUCCESS(status)) {
                  pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
                  pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));

                  if (*is_bridge)
                        pci_id->bus = *bus_number;

                  /* any nicer way to get bus number of bridge ? */
                  status =
                      acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
                                             8);
                  if (ACPI_SUCCESS(status)
                      && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
                        status =
                            acpi_os_read_pci_configuration(pci_id, 0x18,
                                                   &tu8, 8);
                        if (!ACPI_SUCCESS(status)) {
                              /* Certainly broken...  FIX ME */
                              return;
                        }
                        *is_bridge = 1;
                        pci_id->bus = tu8;
                        status =
                            acpi_os_read_pci_configuration(pci_id, 0x19,
                                                   &tu8, 8);
                        if (ACPI_SUCCESS(status)) {
                              *bus_number = tu8;
                        }
                  } else
                        *is_bridge = 0;
            }
      }
}

void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound  */
                     acpi_handle chandle, /* current node */
                     struct acpi_pci_id **id)
{
      int is_bridge = 1;
      u8 bus_number = (*id)->bus;

      acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
}

static void acpi_os_execute_deferred(struct work_struct *work)
{
      struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
      if (!dpc) {
            printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
            return;
      }

      dpc->function(dpc->context);
      kfree(dpc);

      /* Yield cpu to notify thread */
      cond_resched();

      return;
}

static void acpi_os_execute_notify(struct work_struct *work)
{
      struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);

      if (!dpc) {
            printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
            return;
      }

      dpc->function(dpc->context);

      kfree(dpc);

      return;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_execute
 *
 * PARAMETERS:  Type               - Type of the callback
 *              Function           - Function to be executed
 *              Context            - Function parameters
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Depending on type, either queues function for deferred execution or
 *              immediately executes function on a separate thread.
 *
 ******************************************************************************/

acpi_status acpi_os_execute(acpi_execute_type type,
                      acpi_osd_exec_callback function, void *context)
{
      acpi_status status = AE_OK;
      struct acpi_os_dpc *dpc;

      ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                    "Scheduling function [%p(%p)] for deferred execution.\n",
                    function, context));

      if (!function)
            return AE_BAD_PARAMETER;

      /*
       * Allocate/initialize DPC structure.  Note that this memory will be
       * freed by the callee.  The kernel handles the work_struct list  in a
       * way that allows us to also free its memory inside the callee.
       * Because we may want to schedule several tasks with different
       * parameters we can't use the approach some kernel code uses of
       * having a static work_struct.
       */

      dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
      if (!dpc)
            return_ACPI_STATUS(AE_NO_MEMORY);

      dpc->function = function;
      dpc->context = context;

      if (type == OSL_NOTIFY_HANDLER) {
            INIT_WORK(&dpc->work, acpi_os_execute_notify);
            if (!queue_work(kacpi_notify_wq, &dpc->work)) {
                  status = AE_ERROR;
                  kfree(dpc);
            }
      } else {
            INIT_WORK(&dpc->work, acpi_os_execute_deferred);
            if (!queue_work(kacpid_wq, &dpc->work)) {
                  ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                          "Call to queue_work() failed.\n"));
                  status = AE_ERROR;
                  kfree(dpc);
            }
      }
      return_ACPI_STATUS(status);
}

EXPORT_SYMBOL(acpi_os_execute);

void acpi_os_wait_events_complete(void *context)
{
      flush_workqueue(kacpid_wq);
}

EXPORT_SYMBOL(acpi_os_wait_events_complete);

/*
 * Allocate the memory for a spinlock and initialize it.
 */
acpi_status acpi_os_create_lock(acpi_spinlock * handle)
{
      spin_lock_init(*handle);

      return AE_OK;
}

/*
 * Deallocate the memory for a spinlock.
 */
void acpi_os_delete_lock(acpi_spinlock handle)
{
      return;
}

acpi_status
acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
{
      struct semaphore *sem = NULL;


      sem = acpi_os_allocate(sizeof(struct semaphore));
      if (!sem)
            return AE_NO_MEMORY;
      memset(sem, 0, sizeof(struct semaphore));

      sema_init(sem, initial_units);

      *handle = (acpi_handle *) sem;

      ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
                    *handle, initial_units));

      return AE_OK;
}

EXPORT_SYMBOL(acpi_os_create_semaphore);

/*
 * TODO: A better way to delete semaphores?  Linux doesn't have a
 * 'delete_semaphore()' function -- may result in an invalid
 * pointer dereference for non-synchronized consumers.      Should
 * we at least check for blocked threads and signal/cancel them?
 */

acpi_status acpi_os_delete_semaphore(acpi_handle handle)
{
      struct semaphore *sem = (struct semaphore *)handle;


      if (!sem)
            return AE_BAD_PARAMETER;

      ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));

      kfree(sem);
      sem = NULL;

      return AE_OK;
}

EXPORT_SYMBOL(acpi_os_delete_semaphore);

/*
 * TODO: The kernel doesn't have a 'down_timeout' function -- had to
 * improvise.  The process is to sleep for one scheduler quantum
 * until the semaphore becomes available.  Downside is that this
 * may result in starvation for timeout-based waits when there's
 * lots of semaphore activity.
 *
 * TODO: Support for units > 1?
 */
acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
{
      acpi_status status = AE_OK;
      struct semaphore *sem = (struct semaphore *)handle;
      int ret = 0;


      if (!sem || (units < 1))
            return AE_BAD_PARAMETER;

      if (units > 1)
            return AE_SUPPORT;

      ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
                    handle, units, timeout));

      /*
       * This can be called during resume with interrupts off.
       * Like boot-time, we should be single threaded and will
       * always get the lock if we try -- timeout or not.
       * If this doesn't succeed, then we will oops courtesy of
       * might_sleep() in down().
       */
      if (!down_trylock(sem))
            return AE_OK;

      switch (timeout) {
            /*
             * No Wait:
             * --------
             * A zero timeout value indicates that we shouldn't wait - just
             * acquire the semaphore if available otherwise return AE_TIME
             * (a.k.a. 'would block').
             */
      case 0:
            if (down_trylock(sem))
                  status = AE_TIME;
            break;

            /*
             * Wait Indefinitely:
             * ------------------
             */
      case ACPI_WAIT_FOREVER:
            down(sem);
            break;

            /*
             * Wait w/ Timeout:
             * ----------------
             */
      default:
            // TODO: A better timeout algorithm?
            {
                  int i = 0;
                  static const int quantum_ms = 1000 / HZ;

                  ret = down_trylock(sem);
                  for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
                        schedule_timeout_interruptible(1);
                        ret = down_trylock(sem);
                  }

                  if (ret != 0)
                        status = AE_TIME;
            }
            break;
      }

      if (ACPI_FAILURE(status)) {
            ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
                          "Failed to acquire semaphore[%p|%d|%d], %s",
                          handle, units, timeout,
                          acpi_format_exception(status)));
      } else {
            ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
                          "Acquired semaphore[%p|%d|%d]", handle,
                          units, timeout));
      }

      return status;
}

EXPORT_SYMBOL(acpi_os_wait_semaphore);

/*
 * TODO: Support for units > 1?
 */
acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
{
      struct semaphore *sem = (struct semaphore *)handle;


      if (!sem || (units < 1))
            return AE_BAD_PARAMETER;

      if (units > 1)
            return AE_SUPPORT;

      ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
                    units));

      up(sem);

      return AE_OK;
}

EXPORT_SYMBOL(acpi_os_signal_semaphore);

#ifdef ACPI_FUTURE_USAGE
u32 acpi_os_get_line(char *buffer)
{

#ifdef ENABLE_DEBUGGER
      if (acpi_in_debugger) {
            u32 chars;

            kdb_read(buffer, sizeof(line_buf));

            /* remove the CR kdb includes */
            chars = strlen(buffer) - 1;
            buffer[chars] = '\0';
      }
#endif

      return 0;
}
#endif                        /*  ACPI_FUTURE_USAGE  */

acpi_status acpi_os_signal(u32 function, void *info)
{
      switch (function) {
      case ACPI_SIGNAL_FATAL:
            printk(KERN_ERR PREFIX "Fatal opcode executed\n");
            break;
      case ACPI_SIGNAL_BREAKPOINT:
            /*
             * AML Breakpoint
             * ACPI spec. says to treat it as a NOP unless
             * you are debugging.  So if/when we integrate
             * AML debugger into the kernel debugger its
             * hook will go here.  But until then it is
             * not useful to print anything on breakpoints.
             */
            break;
      default:
            break;
      }

      return AE_OK;
}

EXPORT_SYMBOL(acpi_os_signal);

static int __init acpi_os_name_setup(char *str)
{
      char *p = acpi_os_name;
      int count = ACPI_MAX_OVERRIDE_LEN - 1;

      if (!str || !*str)
            return 0;

      for (; count-- && str && *str; str++) {
            if (isalnum(*str) || *str == ' ' || *str == ':')
                  *p++ = *str;
            else if (*str == '\'' || *str == '"')
                  continue;
            else
                  break;
      }
      *p = 0;

      return 1;

}

__setup("acpi_os_name=", acpi_os_name_setup);

static void __init set_osi_linux(unsigned int enable)
{
      if (osi_linux.enable != enable) {
            osi_linux.enable = enable;
            printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
                  enable ? "Add": "Delet");
      }
      return;
}

static void __init acpi_cmdline_osi_linux(unsigned int enable)
{
      osi_linux.cmdline = 1;  /* cmdline set the default */
      set_osi_linux(enable);

      return;
}

void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
{
      osi_linux.dmi = 1;      /* DMI knows that this box asks OSI(Linux) */

      printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);

      if (enable == -1)
            return;

      osi_linux.known = 1;    /* DMI knows which OSI(Linux) default needed */

      set_osi_linux(enable);

      return;
}

/*
 * Modify the list of "OS Interfaces" reported to BIOS via _OSI
 *
 * empty string disables _OSI
 * string starting with '!' disables that string
 * otherwise string is added to list, augmenting built-in strings
 */
static int __init acpi_osi_setup(char *str)
{
      if (str == NULL || *str == '\0') {
            printk(KERN_INFO PREFIX "_OSI method disabled\n");
            acpi_gbl_create_osi_method = FALSE;
      } else if (!strcmp("!Linux", str)) {
            acpi_cmdline_osi_linux(0);    /* !enable */
      } else if (*str == '!') {
            if (acpi_osi_invalidate(++str) == AE_OK)
                  printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
      } else if (!strcmp("Linux", str)) {
            acpi_cmdline_osi_linux(1);    /* enable */
      } else if (*osi_additional_string == '\0') {
            strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
            printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
      }

      return 1;
}

__setup("acpi_osi=", acpi_osi_setup);

/* enable serialization to combat AE_ALREADY_EXISTS errors */
static int __init acpi_serialize_setup(char *str)
{
      printk(KERN_INFO PREFIX "serialize enabled\n");

      acpi_gbl_all_methods_serialized = TRUE;

      return 1;
}

__setup("acpi_serialize", acpi_serialize_setup);

/*
 * Wake and Run-Time GPES are expected to be separate.
 * We disable wake-GPEs at run-time to prevent spurious
 * interrupts.
 *
 * However, if a system exists that shares Wake and
 * Run-time events on the same GPE this flag is available
 * to tell Linux to keep the wake-time GPEs enabled at run-time.
 */
static int __init acpi_wake_gpes_always_on_setup(char *str)
{
      printk(KERN_INFO PREFIX "wake GPEs not disabled\n");

      acpi_gbl_leave_wake_gpes_disabled = FALSE;

      return 1;
}

__setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_setup);

/*
 * Acquire a spinlock.
 *
 * handle is a pointer to the spinlock_t.
 */

acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
{
      acpi_cpu_flags flags;
      spin_lock_irqsave(lockp, flags);
      return flags;
}

/*
 * Release a spinlock. See above.
 */

void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
{
      spin_unlock_irqrestore(lockp, flags);
}

#ifndef ACPI_USE_LOCAL_CACHE

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_create_cache
 *
 * PARAMETERS:  name      - Ascii name for the cache
 *              size      - Size of each cached object
 *              depth     - Maximum depth of the cache (in objects) <ignored>
 *              cache     - Where the new cache object is returned
 *
 * RETURN:      status
 *
 * DESCRIPTION: Create a cache object
 *
 ******************************************************************************/

acpi_status
acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
{
      *cache = kmem_cache_create(name, size, 0, 0, NULL);
      if (*cache == NULL)
            return AE_ERROR;
      else
            return AE_OK;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_purge_cache
 *
 * PARAMETERS:  Cache           - Handle to cache object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Free all objects within the requested cache.
 *
 ******************************************************************************/

acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
{
      kmem_cache_shrink(cache);
      return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_delete_cache
 *
 * PARAMETERS:  Cache           - Handle to cache object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Free all objects within the requested cache and delete the
 *              cache object.
 *
 ******************************************************************************/

acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
{
      kmem_cache_destroy(cache);
      return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_os_release_object
 *
 * PARAMETERS:  Cache       - Handle to cache object
 *              Object      - The object to be released
 *
 * RETURN:      None
 *
 * DESCRIPTION: Release an object to the specified cache.  If cache is full,
 *              the object is deleted.
 *
 ******************************************************************************/

acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
{
      kmem_cache_free(cache, object);
      return (AE_OK);
}

/**
 *    acpi_dmi_dump - dump DMI slots needed for blacklist entry
 *
 *    Returns 0 on success
 */
static int acpi_dmi_dump(void)
{

      if (!dmi_available)
            return -1;

      printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
            dmi_get_system_info(DMI_SYS_VENDOR));
      printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
            dmi_get_system_info(DMI_PRODUCT_NAME));
      printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
            dmi_get_system_info(DMI_PRODUCT_VERSION));
      printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
            dmi_get_system_info(DMI_BOARD_NAME));
      printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
            dmi_get_system_info(DMI_BIOS_VENDOR));
      printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
            dmi_get_system_info(DMI_BIOS_DATE));

      return 0;
}


/******************************************************************************
 *
 * FUNCTION:    acpi_os_validate_interface
 *
 * PARAMETERS:  interface           - Requested interface to be validated
 *
 * RETURN:      AE_OK if interface is supported, AE_SUPPORT otherwise
 *
 * DESCRIPTION: Match an interface string to the interfaces supported by the
 *              host. Strings originate from an AML call to the _OSI method.
 *
 *****************************************************************************/

acpi_status
acpi_os_validate_interface (char *interface)
{
      if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
            return AE_OK;
      if (!strcmp("Linux", interface)) {

            printk(KERN_NOTICE PREFIX
                  "BIOS _OSI(Linux) query %s%s\n",
                  osi_linux.enable ? "honored" : "ignored",
                  osi_linux.cmdline ? " via cmdline" :
                  osi_linux.dmi ? " via DMI" : "");

            if (!osi_linux.dmi) {
                  if (acpi_dmi_dump())
                        printk(KERN_NOTICE PREFIX
                              "[please extract dmidecode output]\n");
                  printk(KERN_NOTICE PREFIX
                        "Please send DMI info above to "
                        "linux-acpi@vger.kernel.org\n");
            }
            if (!osi_linux.known && !osi_linux.cmdline) {
                  printk(KERN_NOTICE PREFIX
                        "If \"acpi_osi=%sLinux\" works better, "
                        "please notify linux-acpi@vger.kernel.org\n",
                        osi_linux.enable ? "!" : "");
            }

            if (osi_linux.enable)
                  return AE_OK;
      }
      return AE_SUPPORT;
}

/******************************************************************************
 *
 * FUNCTION:    acpi_os_validate_address
 *
 * PARAMETERS:  space_id             - ACPI space ID
 *              address             - Physical address
 *              length              - Address length
 *
 * RETURN:      AE_OK if address/length is valid for the space_id. Otherwise,
 *              should return AE_AML_ILLEGAL_ADDRESS.
 *
 * DESCRIPTION: Validate a system address via the host OS. Used to validate
 *              the addresses accessed by AML operation regions.
 *
 *****************************************************************************/

acpi_status
acpi_os_validate_address (
    u8                   space_id,
    acpi_physical_address   address,
    acpi_size               length)
{

    return AE_OK;
}

#endif

Generated by  Doxygen 1.6.0   Back to index