1 files changed, 1162 insertions, 0 deletions

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
new file mode 100644
index 000000000000..5a9128de6226
--- /dev/null
+++ b/drivers/acpi/osl.c
@@ -0,0 +1,1162 @@
+/*
+ *  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/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/pci.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+#include <linux/kmod.h>
+#include <linux/delay.h>
+#include <linux/workqueue.h>
+#include <linux/nmi.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;
+};
+
+#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;
+
+acpi_status
+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).
+         */
+#ifdef CONFIG_ACPI_PCI
+        if (!raw_pci_ops) {
+                printk(KERN_ERR PREFIX "Access to PCI configuration space unavailable\n");
+                return AE_NULL_ENTRY;
+        }
+#endif
+        kacpid_wq = create_singlethread_workqueue("kacpid");
+        BUG_ON(!kacpid_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);
+
+        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
+}
+
+void *
+acpi_os_allocate(acpi_size size)
+{
+        return kmalloc(size, GFP_KERNEL);
+}
+
+void
+acpi_os_free(void *ptr)
+{
+        kfree(ptr);
+}
+EXPORT_SYMBOL(acpi_os_free);
+
+acpi_status
+acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
+{
+        if (efi_enabled) {
+                addr->pointer_type = ACPI_PHYSICAL_POINTER;
+                if (efi.acpi20)
+                        addr->pointer.physical =
+                                (acpi_physical_address) virt_to_phys(efi.acpi20);
+                else if (efi.acpi)
+                        addr->pointer.physical =
+                                (acpi_physical_address) virt_to_phys(efi.acpi);
+                else {
+                        printk(KERN_ERR PREFIX "System description tables not found\n");
+                        return AE_NOT_FOUND;
+                }
+        } else {
+                if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
+                        printk(KERN_ERR PREFIX "System description tables not found\n");
+                        return AE_NOT_FOUND;
+                }
+        }
+
+        return AE_OK;
+}
+
+acpi_status
+acpi_os_map_memory(acpi_physical_address phys, acpi_size size, void __iomem **virt)
+{
+        if (efi_enabled) {
+                if (EFI_MEMORY_WB & efi_mem_attributes(phys)) {
+                        *virt = (void __iomem *) phys_to_virt(phys);
+                } else {
+                        *virt = ioremap(phys, size);
+                }
+        } else {
+                if (phys > ULONG_MAX) {
+                        printk(KERN_ERR PREFIX "Cannot map memory that high\n");
+                        return AE_BAD_PARAMETER;
+                }
+                /*
+                 * ioremap checks to ensure this is in reserved space
+                 */
+                *virt = ioremap((unsigned long) phys, size);
+        }
+
+        if (!*virt)
+                return AE_NO_MEMORY;
+
+        return AE_OK;
+}
+
+void
+acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
+{
+        iounmap(virt);
+}
+
+#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, struct pt_regs *regs)
+{
+        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_fadt.sci_int;
+        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, SA_SHIRQ, "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)
+{
+        current->state = TASK_INTERRUPTIBLE;
+        schedule_timeout(((signed long) ms * HZ) / 1000);
+}
+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;
+
+        switch (width)
+        {
+        case 8:
+                *(u8*)  value = inb(port);
+                break;
+        case 16:
+                *(u16*) value = inw(port);
+                break;
+        case 32:
+                *(u32*) value = inl(port);
+                break;
+        default:
+                BUG();
+        }
+
+        return AE_OK;
+}
+EXPORT_SYMBOL(acpi_os_read_port);
+
+acpi_status
+acpi_os_write_port(
+        acpi_io_address port,
+        u32             value,
+        u32             width)
+{
+        switch (width)
+        {
+        case 8:
+                outb(value, port);
+                break;
+        case 16:
+                outw(value, port);
+                break;
+        case 32:
+                outl(value, port);
+                break;
+        default:
+                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;
+        int                     iomem = 0;
+
+        if (efi_enabled) {
+                if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
+                        /* HACK ALERT! We can use readb/w/l on real memory too.. */
+                        virt_addr = (void __iomem *) phys_to_virt(phys_addr);
+                } else {
+                        iomem = 1;
+                        virt_addr = ioremap(phys_addr, width);
+                }
+        } else
+                virt_addr = (void __iomem *) phys_to_virt(phys_addr);
+        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();
+        }
+
+        if (efi_enabled) {
+                if (iomem)
+                        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;
+        int                     iomem = 0;
+
+        if (efi_enabled) {
+                if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
+                        /* HACK ALERT! We can use writeb/w/l on real memory too */
+                        virt_addr = (void __iomem *) phys_to_virt(phys_addr);
+                } else {
+                        iomem = 1;
+                        virt_addr = ioremap(phys_addr, width);
+                }
+        } else
+                virt_addr = (void __iomem *) phys_to_virt(phys_addr);
+
+        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();
+        }
+
+        if (iomem)
+                iounmap(virt_addr);
+
+        return AE_OK;
+}
+
+#ifdef CONFIG_ACPI_PCI
+
+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);
+}
+
+#else /*!CONFIG_ACPI_PCI*/
+
+acpi_status
+acpi_os_write_pci_configuration (
+        struct acpi_pci_id      *pci_id,
+        u32                     reg,
+        acpi_integer            value,
+        u32                     width)
+{
+        return AE_SUPPORT;
+}
+
+acpi_status
+acpi_os_read_pci_configuration (
+        struct acpi_pci_id      *pci_id,
+        u32                     reg,
+        void                    *value,
+        u32                     width)
+{
+        return AE_SUPPORT;
+}
+
+void
+acpi_os_derive_pci_id (
+        acpi_handle             rhandle,        /* upper bound  */
+        acpi_handle             chandle,        /* current node */
+        struct acpi_pci_id      **id)
+{
+}
+
+#endif /*CONFIG_ACPI_PCI*/
+
+static void
+acpi_os_execute_deferred (
+        void *context)
+{
+        struct acpi_os_dpc      *dpc = NULL;
+
+        ACPI_FUNCTION_TRACE ("os_execute_deferred");
+
+        dpc = (struct acpi_os_dpc *) context;
+        if (!dpc) {
+                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
+                return_VOID;
+        }
+
+        dpc->function(dpc->context);
+
+        kfree(dpc);
+
+        return_VOID;
+}
+
+acpi_status
+acpi_os_queue_for_execution(
+        u32                     priority,
+        acpi_osd_exec_callback  function,
+        void                    *context)
+{
+        acpi_status             status = AE_OK;
+        struct acpi_os_dpc      *dpc;
+        struct work_struct      *task;
+
+        ACPI_FUNCTION_TRACE ("os_queue_for_execution");
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Scheduling function [%p(%p)] for deferred execution.\n", function, context));
+
+        if (!function)
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+
+        /*
+         * Allocate/initialize DPC structure.  Note that this memory will be
+         * freed by the callee.  The kernel handles the tq_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 tq_struct.
+         * We can save time and code by allocating the DPC and tq_structs
+         * from the same memory.
+         */
+
+        dpc = kmalloc(sizeof(struct acpi_os_dpc)+sizeof(struct work_struct), GFP_ATOMIC);
+        if (!dpc)
+                return_ACPI_STATUS (AE_NO_MEMORY);
+
+        dpc->function = function;
+        dpc->context = context;
+
+        task = (void *)(dpc+1);
+        INIT_WORK(task, acpi_os_execute_deferred, (void*)dpc);
+
+        if (!queue_work(kacpid_wq, task)) {
+                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Call to queue_work() failed.\n"));
+                kfree(dpc);
+                status = AE_ERROR;
+        }
+
+        return_ACPI_STATUS (status);
+}
+EXPORT_SYMBOL(acpi_os_queue_for_execution);
+
+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_handle     *out_handle)
+{
+        spinlock_t *lock_ptr;
+
+        ACPI_FUNCTION_TRACE ("os_create_lock");
+
+        lock_ptr = acpi_os_allocate(sizeof(spinlock_t));
+
+        spin_lock_init(lock_ptr);
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Creating spinlock[%p].\n", lock_ptr));
+
+        *out_handle = lock_ptr;
+
+        return_ACPI_STATUS (AE_OK);
+}
+
+
+/*
+ * Deallocate the memory for a spinlock.
+ */
+void
+acpi_os_delete_lock (
+        acpi_handle     handle)
+{
+        ACPI_FUNCTION_TRACE ("os_create_lock");
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Deleting spinlock[%p].\n", handle));
+
+        acpi_os_free(handle);
+
+        return_VOID;
+}
+
+/*
+ * Acquire a spinlock.
+ *
+ * handle is a pointer to the spinlock_t.
+ * flags is *not* the result of save_flags - it is an ACPI-specific flag variable
+ *   that indicates whether we are at interrupt level.
+ */
+void
+acpi_os_acquire_lock (
+        acpi_handle     handle,
+        u32             flags)
+{
+        ACPI_FUNCTION_TRACE ("os_acquire_lock");
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Acquiring spinlock[%p] from %s level\n", handle,
+                ((flags & ACPI_NOT_ISR) ? "non-interrupt" : "interrupt")));
+
+        if (flags & ACPI_NOT_ISR)
+                ACPI_DISABLE_IRQS();
+
+        spin_lock((spinlock_t *)handle);
+
+        return_VOID;
+}
+
+
+/*
+ * Release a spinlock. See above.
+ */
+void
+acpi_os_release_lock (
+        acpi_handle     handle,
+        u32             flags)
+{
+        ACPI_FUNCTION_TRACE ("os_release_lock");
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Releasing spinlock[%p] from %s level\n", handle,
+                ((flags & ACPI_NOT_ISR) ? "non-interrupt" : "interrupt")));
+
+        spin_unlock((spinlock_t *)handle);
+
+        if (flags & ACPI_NOT_ISR)
+                ACPI_ENABLE_IRQS();
+
+        return_VOID;
+}
+
+
+acpi_status
+acpi_os_create_semaphore(
+        u32             max_units,
+        u32             initial_units,
+        acpi_handle     *handle)
+{
+        struct semaphore        *sem = NULL;
+
+        ACPI_FUNCTION_TRACE ("os_create_semaphore");
+
+        sem = acpi_os_allocate(sizeof(struct semaphore));
+        if (!sem)
+                return_ACPI_STATUS (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_ACPI_STATUS (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;
+
+        ACPI_FUNCTION_TRACE ("os_delete_semaphore");
+
+        if (!sem)
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
+
+        acpi_os_free(sem); sem =  NULL;
+
+        return_ACPI_STATUS (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;
+
+        ACPI_FUNCTION_TRACE ("os_wait_semaphore");
+
+        if (!sem || (units < 1))
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+
+        if (units > 1)
+                return_ACPI_STATUS (AE_SUPPORT);
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", handle, units, timeout));
+
+        if (in_atomic())
+                timeout = 0;
+
+        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) {
+                                current->state = TASK_INTERRUPTIBLE;
+                                schedule_timeout(1);
+                                ret = down_trylock(sem);
+                        }
+        
+                        if (ret != 0)
+                                status = AE_TIME;
+                }
+                break;
+        }
+
+        if (ACPI_FAILURE(status)) {
+                ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Failed to acquire semaphore[%p|%d|%d], %s\n", 
+                        handle, units, timeout, acpi_format_exception(status)));
+        }
+        else {
+                ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Acquired semaphore[%p|%d|%d]\n", handle, units, timeout));
+        }
+
+        return_ACPI_STATUS (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;
+
+        ACPI_FUNCTION_TRACE ("os_signal_semaphore");
+
+        if (!sem || (units < 1))
+                return_ACPI_STATUS (AE_BAD_PARAMETER);
+
+        if (units > 1)
+                return_ACPI_STATUS (AE_SUPPORT);
+
+        ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle, units));
+
+        up(sem);
+
+        return_ACPI_STATUS (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  */
+
+/* Assumes no unreadable holes inbetween */
+u8
+acpi_os_readable(void *ptr, acpi_size len)
+{
+#if defined(__i386__) || defined(__x86_64__) 
+        char tmp;
+        return !__get_user(tmp, (char __user *)ptr) && !__get_user(tmp, (char __user *)ptr + len - 1);
+#endif
+        return 1;
+}
+
+#ifdef ACPI_FUTURE_USAGE
+u8
+acpi_os_writable(void *ptr, acpi_size len)
+{
+        /* could do dummy write (racy) or a kernel page table lookup.
+           The later may be difficult at early boot when kmap doesn't work yet. */
+        return 1;
+}
+#endif
+
+u32
+acpi_os_get_thread_id (void)
+{
+        if (!in_atomic())
+                return current->pid;
+
+        return 0;
+}
+
+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);
+
+/*
+ * _OSI control
+ * empty string disables _OSI
+ * TBD additional string adds to _OSI
+ */
+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
+        {
+                /* TBD */
+                printk(KERN_ERR PREFIX "_OSI additional string ignored -- %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);
+
+/*
+ * max_cstate is defined in the base kernel so modules can
+ * change it w/o depending on the state of the processor module.
+ */
+unsigned int max_cstate = ACPI_PROCESSOR_MAX_POWER;
+
+
+EXPORT_SYMBOL(max_cstate);