os.c
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上传日期:2013-04-10
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文件大小:17k
- /******************************************************************************
- *
- * Module Name: os.c - Linux OSL functions
- * $Revision: 49 $
- *
- *****************************************************************************/
- /*
- * os.c - OS-dependent functions
- *
- * Copyright (C) 2000 Andrew Henroid
- * Copyright (C) 2001 Andrew Grover
- *
- * 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
- */
- /* Changes
- *
- * Christopher Liebman <liebman@sponsera.com> 2001-5-15
- * - Fixed improper kernel_thread parameters
- */
- #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 <asm/io.h>
- #include <acpi.h>
- #ifdef CONFIG_ACPI_EFI
- #include <linux/efi.h>
- #endif
- #ifdef _IA64
- #include <asm/hw_irq.h>
- #endif
- #define _COMPONENT ACPI_OS_SERVICES
- MODULE_NAME ("os")
- typedef struct
- {
- OSD_EXECUTION_CALLBACK function;
- void *context;
- } ACPI_OS_DPC;
- /*****************************************************************************
- * Debugger Stuff
- *****************************************************************************/
- #ifdef ENABLE_DEBUGGER
- #include <linux/kdb.h>
- /* stuff for debugger support */
- int acpi_in_debugger = 0;
- extern NATIVE_CHAR line_buf[80];
- #endif
- /*****************************************************************************
- * Globals
- *****************************************************************************/
- static int acpi_irq_irq = 0;
- static OSD_HANDLER acpi_irq_handler = NULL;
- static void *acpi_irq_context = NULL;
- /******************************************************************************
- * Functions
- *****************************************************************************/
- acpi_status
- acpi_os_initialize(void)
- {
- return AE_OK;
- }
- acpi_status
- acpi_os_terminate(void)
- {
- if (acpi_irq_handler) {
- acpi_os_remove_interrupt_handler(acpi_irq_irq,
- acpi_irq_handler);
- }
- return AE_OK;
- }
- s32
- acpi_os_printf(const NATIVE_CHAR *fmt,...)
- {
- s32 size;
- va_list args;
- va_start(args, fmt);
- size = acpi_os_vprintf(fmt, args);
- va_end(args);
- return size;
- }
- s32
- acpi_os_vprintf(const NATIVE_CHAR *fmt, va_list args)
- {
- static char buffer[512];
- int size = vsprintf(buffer, fmt, args);
- #ifdef ENABLE_DEBUGGER
- if (acpi_in_debugger) {
- kdb_printf("%s", buffer);
- } else {
- printk("%s", buffer);
- }
- #else
- printk("%s", buffer);
- #endif
- return size;
- }
- void *
- acpi_os_allocate(u32 size)
- {
- return kmalloc(size, GFP_KERNEL);
- }
- void *
- acpi_os_callocate(u32 size)
- {
- void *ptr = acpi_os_allocate(size);
- if (ptr)
- memset(ptr, 0, size);
- return ptr;
- }
- void
- acpi_os_free(void *ptr)
- {
- kfree(ptr);
- }
- acpi_status
- acpi_os_get_root_pointer(u32 flags, ACPI_PHYSICAL_ADDRESS *phys_addr)
- {
- #ifndef CONFIG_ACPI_EFI
- if (ACPI_FAILURE(acpi_find_root_pointer(flags, phys_addr))) {
- printk(KERN_ERR "ACPI: System description tables not foundn");
- return AE_ERROR;
- }
- #else /*CONFIG_ACPI_EFI*/
- if (efi.acpi20)
- *phys_addr = (ACPI_PHYSICAL_ADDRESS) efi.acpi20;
- else if (efi.acpi)
- *phys_addr = (ACPI_PHYSICAL_ADDRESS) efi.acpi;
- else {
- printk(KERN_ERR "ACPI: System description tables not foundn");
- *phys_addr = NULL;
- return AE_ERROR;
- }
- #endif /*CONFIG_ACPI_EFI*/
- return AE_OK;
- }
- acpi_status
- acpi_os_map_memory(ACPI_PHYSICAL_ADDRESS phys, u32 size, void **virt)
- {
- if (phys > ULONG_MAX) {
- printk(KERN_ERR "ACPI: Cannot map memory that highn");
- return AE_ERROR;
- }
- *virt = ioremap((unsigned long) phys, size);
- if (!*virt)
- return AE_ERROR;
- return AE_OK;
- }
- void
- acpi_os_unmap_memory(void *virt, u32 size)
- {
- iounmap(virt);
- }
- 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;
- }
- static void
- acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
- {
- (*acpi_irq_handler)(acpi_irq_context);
- }
- acpi_status
- acpi_os_install_interrupt_handler(u32 irq, OSD_HANDLER handler, void *context)
- {
- #ifdef _IA64
- irq = isa_irq_to_vector(irq);
- #endif /*_IA64*/
- acpi_irq_irq = irq;
- acpi_irq_handler = handler;
- acpi_irq_context = context;
- if (request_irq(irq,
- acpi_irq,
- SA_SHIRQ,
- "acpi",
- acpi_irq)) {
- printk(KERN_ERR "ACPI: SCI (IRQ%d) allocation failedn", irq);
- return AE_ERROR;
- }
- return AE_OK;
- }
- acpi_status
- acpi_os_remove_interrupt_handler(u32 irq, OSD_HANDLER handler)
- {
- if (acpi_irq_handler) {
- #ifdef _IA64
- irq = isa_irq_to_vector(irq);
- #endif /*_IA64*/
- free_irq(irq, acpi_irq);
- acpi_irq_handler = NULL;
- }
- return AE_OK;
- }
- /*
- * Running in interpreter thread context, safe to sleep
- */
- void
- acpi_os_sleep(u32 sec, u32 ms)
- {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(HZ * sec + (ms * HZ) / 1000);
- }
- void
- acpi_os_stall(u32 us)
- {
- if (us > 10000) {
- mdelay(us / 1000);
- }
- else {
- udelay(us);
- }
- }
- acpi_status
- acpi_os_read_port(
- ACPI_IO_ADDRESS port,
- void *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;
- }
- acpi_status
- acpi_os_write_port(
- ACPI_IO_ADDRESS port,
- NATIVE_UINT 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;
- }
- acpi_status
- acpi_os_read_memory(
- ACPI_PHYSICAL_ADDRESS phys_addr,
- void *value,
- u32 width)
- {
- u32 dummy;
- if (!value)
- value = &dummy;
- switch (width)
- {
- case 8:
- *(u8*) value = *(u8*) phys_to_virt(phys_addr);
- break;
- case 16:
- *(u16*) value = *(u16*) phys_to_virt(phys_addr);
- break;
- case 32:
- *(u32*) value = *(u32*) phys_to_virt(phys_addr);
- break;
- default:
- BUG();
- }
- return AE_OK;
- }
- acpi_status
- acpi_os_write_memory(
- ACPI_PHYSICAL_ADDRESS phys_addr,
- NATIVE_UINT value,
- u32 width)
- {
- switch (width)
- {
- case 8:
- *(u8*) phys_to_virt(phys_addr) = value;
- break;
- case 16:
- *(u16*) phys_to_virt(phys_addr) = value;
- break;
- case 32:
- *(u32*) phys_to_virt(phys_addr) = value;
- break;
- default:
- BUG();
- }
- return AE_OK;
- }
- #ifdef CONFIG_ACPI_PCI
- /* Architecture-dependent low-level PCI configuration access functions. */
- extern int (*pci_config_read)(int seg, int bus, int dev, int fn, int reg, int len, u32 *val);
- extern int (*pci_config_write)(int seg, int bus, int dev, int fn, int reg, int len, u32 val);
- acpi_status
- acpi_os_read_pci_configuration (
- acpi_pci_id *pci_id,
- u32 reg,
- void *value,
- u32 width)
- {
- int result = 0;
- if (!value)
- return AE_ERROR;
- switch (width)
- {
- case 8:
- result = pci_config_read(pci_id->segment, pci_id->bus,
- pci_id->device, pci_id->function, reg, 1, value);
- break;
- case 16:
- result = pci_config_read(pci_id->segment, pci_id->bus,
- pci_id->device, pci_id->function, reg, 2, value);
- break;
- case 32:
- result = pci_config_read(pci_id->segment, pci_id->bus,
- pci_id->device, pci_id->function, reg, 4, value);
- break;
- default:
- BUG();
- }
- return (result ? AE_ERROR : AE_OK);
- }
- ACPI_STATUS
- acpi_os_write_pci_configuration (
- acpi_pci_id *pci_id,
- u32 reg,
- NATIVE_UINT value,
- u32 width)
- {
- int result = 0;
- switch (width)
- {
- case 8:
- result = pci_config_write(pci_id->segment, pci_id->bus,
- pci_id->device, pci_id->function, reg, 1, value);
- break;
- case 16:
- result = pci_config_write(pci_id->segment, pci_id->bus,
- pci_id->device, pci_id->function, reg, 2, value);
- break;
- case 32:
- result = pci_config_write(pci_id->segment, pci_id->bus,
- pci_id->device, pci_id->function, reg, 4, value);
- break;
- default:
- BUG();
- }
- return (result ? AE_ERROR : AE_OK);
- }
- #else /*CONFIG_ACPI_PCI*/
- acpi_status
- acpi_os_read_pci_configuration (
- acpi_pci_id *pci_id,
- u32 reg,
- void *value,
- u32 width)
- {
- int devfn = PCI_DEVFN(pci_id->device, pci_id->function);
- struct pci_dev *dev = pci_find_slot(pci_id->bus, devfn);
- if (!value || !dev)
- return AE_ERROR;
- switch (width)
- {
- case 8:
- if (pci_read_config_byte(dev, reg, (u8*) value))
- return AE_ERROR;
- break;
- case 16:
- if (pci_read_config_word(dev, reg, (u16*) value))
- return AE_ERROR;
- break;
- case 32:
- if (pci_read_config_dword(dev, reg, (u32*) value))
- return AE_ERROR;
- break;
- default:
- BUG();
- }
- return AE_OK;
- }
- acpi_status
- acpi_os_write_pci_configuration (
- acpi_pci_id *pci_id,
- u32 reg,
- NATIVE_UINT value,
- u32 width)
- {
- int devfn = PCI_DEVFN(pci_id->device, pci_id->function);
- struct pci_dev *dev = pci_find_slot(pci_id->bus, devfn);
- if (!dev)
- return AE_ERROR;
- switch (width)
- {
- case 8:
- if (pci_write_config_byte(dev, reg, value))
- return AE_ERROR;
- break;
- case 16:
- if (pci_write_config_word(dev, reg, value))
- return AE_ERROR;
- break;
- case 32:
- if (pci_write_config_dword(dev, reg, value))
- return AE_ERROR;
- break;
- default:
- BUG();
- }
- return AE_OK;
- }
- #endif /*CONFIG_ACPI_PCI*/
- acpi_status
- acpi_os_load_module (
- char *module_name)
- {
- PROC_NAME("acpi_os_load_module");
- if (!module_name)
- return AE_BAD_PARAMETER;
- if (0 > request_module(module_name)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Unable to load module [%s].n", module_name));
- return AE_ERROR;
- }
- return AE_OK;
- }
- acpi_status
- acpi_os_unload_module (
- char *module_name)
- {
- if (!module_name)
- return AE_BAD_PARAMETER;
- /* TODO: How on Linux? */
- /* this is done automatically for all modules with
- use_count = 0, I think. see: MOD_INC_USE_COUNT -ASG */
- return AE_OK;
- }
- /*
- * See acpi_os_queue_for_execution()
- */
- static int
- acpi_os_queue_exec (
- void *context)
- {
- ACPI_OS_DPC *dpc = (ACPI_OS_DPC*)context;
- PROC_NAME("acpi_os_queue_exec");
- daemonize();
- strcpy(current->comm, "kacpidpc");
-
- if (!dpc || !dpc->function)
- return AE_BAD_PARAMETER;
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Executing function [%p(%p)].n", dpc->function, dpc->context));
- dpc->function(dpc->context);
- kfree(dpc);
- return 1;
- }
- static void
- acpi_os_schedule_exec (
- void *context)
- {
- ACPI_OS_DPC *dpc = NULL;
- int thread_pid = -1;
- PROC_NAME("acpi_os_schedule_exec");
- dpc = (ACPI_OS_DPC*)context;
- if (!dpc) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid (NULL) context.n"));
- return;
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Creating new thread to run function [%p(%p)].n", dpc->function, dpc->context));
- thread_pid = kernel_thread(acpi_os_queue_exec, dpc,
- (CLONE_FS | CLONE_FILES | SIGCHLD));
- if (thread_pid < 0) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Call to kernel_thread() failed.n"));
- acpi_os_free(dpc);
- }
- }
- acpi_status
- acpi_os_queue_for_execution(
- u32 priority,
- OSD_EXECUTION_CALLBACK function,
- void *context)
- {
- acpi_status status = AE_OK;
- ACPI_OS_DPC *dpc = NULL;
- PROC_NAME("acpi_os_queue_for_execution");
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Scheduling function [%p(%p)] for deferred execution.n", function, context));
- if (!function)
- return AE_BAD_PARAMETER;
- /*
- * Queue via DPC:
- * --------------
- * Note that we have to use two different processes for queuing DPCs:
- * Interrupt-Level: Use schedule_task; can't spawn a new thread.
- * Kernel-Level: Spawn a new kernel thread, as schedule_task has
- * its limitations (e.g. single-threaded model), and
- * all other task queues run at interrupt-level.
- */
- switch (priority) {
- case OSD_PRIORITY_GPE:
- {
- static struct tq_struct task;
- /*
- * Allocate/initialize DPC structure. Note that this memory will be
- * freed by the callee.
- */
- dpc = kmalloc(sizeof(ACPI_OS_DPC), GFP_ATOMIC);
- if (!dpc)
- return AE_NO_MEMORY;
- dpc->function = function;
- dpc->context = context;
- memset(&task, 0, sizeof(struct tq_struct));
- task.routine = acpi_os_schedule_exec;
- task.data = (void*)dpc;
- if (schedule_task(&task) < 0) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Call to schedule_task() failed.n"));
- status = AE_ERROR;
- }
- }
- break;
- default:
- /*
- * Allocate/initialize DPC structure. Note that this memory will be
- * freed by the callee.
- */
- dpc = kmalloc(sizeof(ACPI_OS_DPC), GFP_KERNEL);
- if (!dpc)
- return AE_NO_MEMORY;
- dpc->function = function;
- dpc->context = context;
- acpi_os_schedule_exec(dpc);
- break;
- }
- return status;
- }
- acpi_status
- acpi_os_create_semaphore(
- u32 max_units,
- u32 initial_units,
- acpi_handle *handle)
- {
- struct semaphore *sem = NULL;
- PROC_NAME("acpi_os_create_semaphore");
- sem = acpi_os_callocate(sizeof(struct semaphore));
- if (!sem)
- return AE_NO_MEMORY;
- sema_init(sem, initial_units);
- *handle = (acpi_handle*)sem;
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Creating semaphore[%p|%d].n", *handle, initial_units));
- return AE_OK;
- }
- /*
- * 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;
- PROC_NAME("acpi_os_delete_semaphore");
- if (!sem)
- return AE_BAD_PARAMETER;
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Deleting semaphore[%p].n", handle));
- acpi_os_free(sem); sem = NULL;
- return AE_OK;
- }
- /*
- * 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,
- u32 timeout)
- {
- acpi_status status = AE_OK;
- struct semaphore *sem = (struct semaphore*)handle;
- int ret = 0;
- PROC_NAME("acpi_os_wait_semaphore");
- if (!sem || (units < 1))
- return AE_BAD_PARAMETER;
- if (units > 1)
- return AE_SUPPORT;
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Waiting for semaphore[%p|%d|%d]n", handle, units, timeout));
- 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 WAIT_FOREVER:
- ret = down_interruptible(sem);
- if (ret < 0)
- status = AE_ERROR;
- 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_INFO, "Failed to acquire semaphore[%p|%d|%d]n", handle, units, timeout));
- }
- else {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Acquired semaphore[%p|%d|%d]n", handle, units, timeout));
- }
- return status;
- }
- /*
- * TODO: Support for units > 1?
- */
- acpi_status
- acpi_os_signal_semaphore(
- acpi_handle handle,
- u32 units)
- {
- struct semaphore *sem = (struct semaphore *) handle;
- PROC_NAME("acpi_os_signal_semaphore");
- if (!sem || (units < 1))
- return AE_BAD_PARAMETER;
- if (units > 1)
- return AE_SUPPORT;
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Signaling semaphore[%p|%d]n", handle, units));
- up(sem);
- return AE_OK;
- }
- u32
- acpi_os_get_line(NATIVE_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] = ' ';
- }
- #endif
- return 0;
- }
- /*
- * We just have to assume we're dealing with valid memory
- */
- BOOLEAN
- acpi_os_readable(void *ptr, u32 len)
- {
- return 1;
- }
- BOOLEAN
- acpi_os_writable(void *ptr, u32 len)
- {
- return 1;
- }
- u32
- acpi_os_get_thread_id (void)
- {
- if (!in_interrupt())
- return current->pid;
- return 0;
- }
- acpi_status
- acpi_os_signal (
- u32 function,
- void *info)
- {
- switch (function)
- {
- case ACPI_SIGNAL_FATAL:
- printk(KERN_ERR "ACPI: Fatal opcode executedn");
- break;
- case ACPI_SIGNAL_BREAKPOINT:
- {
- char *bp_info = (char*) info;
- printk(KERN_ERR "ACPI breakpoint: %sn", bp_info);
- }
- default:
- break;
- }
- return AE_OK;
- }
- acpi_status
- acpi_os_breakpoint(NATIVE_CHAR *msg)
- {
- acpi_os_printf("breakpoint: %s", msg);
-
- return AE_OK;
- }