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Diffstat (limited to 'drivers/acpi/osl.c')
| -rw-r--r-- | drivers/acpi/osl.c | 1162 |
1 files changed, 1162 insertions, 0 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c new file mode 100644 index 0000000..5a9128d --- /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); |
