1178 lines
24 KiB
C
1178 lines
24 KiB
C
/*
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* acpi_osl.c - OS-dependent functions ($Revision: 83 $)
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*
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* Copyright (C) 2000 Andrew Henroid
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/pci.h>
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#include <linux/smp_lock.h>
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#include <linux/interrupt.h>
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#include <linux/kmod.h>
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#include <linux/delay.h>
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#include <linux/workqueue.h>
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#include <linux/nmi.h>
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#include <acpi/acpi.h>
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#include <asm/io.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/processor.h>
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#include <asm/uaccess.h>
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#include <linux/efi.h>
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#define _COMPONENT ACPI_OS_SERVICES
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ACPI_MODULE_NAME ("osl")
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#define PREFIX "ACPI: "
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struct acpi_os_dpc
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{
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acpi_osd_exec_callback function;
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void *context;
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};
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#ifdef CONFIG_ACPI_CUSTOM_DSDT
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#include CONFIG_ACPI_CUSTOM_DSDT_FILE
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#endif
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#ifdef ENABLE_DEBUGGER
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#include <linux/kdb.h>
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/* stuff for debugger support */
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int acpi_in_debugger;
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EXPORT_SYMBOL(acpi_in_debugger);
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extern char line_buf[80];
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#endif /*ENABLE_DEBUGGER*/
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int acpi_specific_hotkey_enabled = TRUE;
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EXPORT_SYMBOL(acpi_specific_hotkey_enabled);
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static unsigned int acpi_irq_irq;
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static acpi_osd_handler acpi_irq_handler;
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static void *acpi_irq_context;
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static struct workqueue_struct *kacpid_wq;
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acpi_status
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acpi_os_initialize(void)
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{
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return AE_OK;
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}
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acpi_status
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acpi_os_initialize1(void)
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{
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/*
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* Initialize PCI configuration space access, as we'll need to access
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* it while walking the namespace (bus 0 and root bridges w/ _BBNs).
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*/
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#ifdef CONFIG_ACPI_PCI
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if (!raw_pci_ops) {
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printk(KERN_ERR PREFIX "Access to PCI configuration space unavailable\n");
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return AE_NULL_ENTRY;
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}
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#endif
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kacpid_wq = create_singlethread_workqueue("kacpid");
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BUG_ON(!kacpid_wq);
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return AE_OK;
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}
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acpi_status
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acpi_os_terminate(void)
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{
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if (acpi_irq_handler) {
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acpi_os_remove_interrupt_handler(acpi_irq_irq,
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acpi_irq_handler);
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}
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destroy_workqueue(kacpid_wq);
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return AE_OK;
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}
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void
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acpi_os_printf(const char *fmt,...)
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{
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va_list args;
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va_start(args, fmt);
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acpi_os_vprintf(fmt, args);
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va_end(args);
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}
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EXPORT_SYMBOL(acpi_os_printf);
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void
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acpi_os_vprintf(const char *fmt, va_list args)
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{
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static char buffer[512];
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vsprintf(buffer, fmt, args);
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#ifdef ENABLE_DEBUGGER
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if (acpi_in_debugger) {
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kdb_printf("%s", buffer);
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} else {
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printk("%s", buffer);
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}
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#else
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printk("%s", buffer);
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#endif
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}
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extern int acpi_in_resume;
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void *
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acpi_os_allocate(acpi_size size)
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{
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if (acpi_in_resume)
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return kmalloc(size, GFP_ATOMIC);
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else
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return kmalloc(size, GFP_KERNEL);
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}
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void
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acpi_os_free(void *ptr)
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{
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kfree(ptr);
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}
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EXPORT_SYMBOL(acpi_os_free);
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acpi_status
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acpi_os_get_root_pointer(u32 flags, struct acpi_pointer *addr)
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{
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if (efi_enabled) {
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addr->pointer_type = ACPI_PHYSICAL_POINTER;
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if (efi.acpi20)
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addr->pointer.physical =
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(acpi_physical_address) virt_to_phys(efi.acpi20);
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else if (efi.acpi)
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addr->pointer.physical =
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(acpi_physical_address) virt_to_phys(efi.acpi);
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else {
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printk(KERN_ERR PREFIX "System description tables not found\n");
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return AE_NOT_FOUND;
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}
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} else {
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if (ACPI_FAILURE(acpi_find_root_pointer(flags, addr))) {
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printk(KERN_ERR PREFIX "System description tables not found\n");
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return AE_NOT_FOUND;
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}
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}
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return AE_OK;
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}
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acpi_status
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acpi_os_map_memory(acpi_physical_address phys, acpi_size size, void __iomem **virt)
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{
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if (efi_enabled) {
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if (EFI_MEMORY_WB & efi_mem_attributes(phys)) {
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*virt = (void __iomem *) phys_to_virt(phys);
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} else {
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*virt = ioremap(phys, size);
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}
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} else {
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if (phys > ULONG_MAX) {
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printk(KERN_ERR PREFIX "Cannot map memory that high\n");
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return AE_BAD_PARAMETER;
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}
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/*
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* ioremap checks to ensure this is in reserved space
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*/
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*virt = ioremap((unsigned long) phys, size);
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}
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if (!*virt)
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return AE_NO_MEMORY;
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return AE_OK;
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}
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void
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acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
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{
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iounmap(virt);
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}
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#ifdef ACPI_FUTURE_USAGE
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acpi_status
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acpi_os_get_physical_address(void *virt, acpi_physical_address *phys)
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{
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if(!phys || !virt)
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return AE_BAD_PARAMETER;
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*phys = virt_to_phys(virt);
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return AE_OK;
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}
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#endif
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#define ACPI_MAX_OVERRIDE_LEN 100
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static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
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acpi_status
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acpi_os_predefined_override (const struct acpi_predefined_names *init_val,
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acpi_string *new_val)
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{
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if (!init_val || !new_val)
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return AE_BAD_PARAMETER;
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*new_val = NULL;
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if (!memcmp (init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
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printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
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acpi_os_name);
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*new_val = acpi_os_name;
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}
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return AE_OK;
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}
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acpi_status
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acpi_os_table_override (struct acpi_table_header *existing_table,
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struct acpi_table_header **new_table)
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{
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if (!existing_table || !new_table)
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return AE_BAD_PARAMETER;
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#ifdef CONFIG_ACPI_CUSTOM_DSDT
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if (strncmp(existing_table->signature, "DSDT", 4) == 0)
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*new_table = (struct acpi_table_header*)AmlCode;
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else
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*new_table = NULL;
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#else
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*new_table = NULL;
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#endif
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return AE_OK;
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}
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static irqreturn_t
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acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
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{
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return (*acpi_irq_handler)(acpi_irq_context) ? IRQ_HANDLED : IRQ_NONE;
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}
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acpi_status
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acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler, void *context)
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{
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unsigned int irq;
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/*
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* Ignore the GSI from the core, and use the value in our copy of the
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* FADT. It may not be the same if an interrupt source override exists
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* for the SCI.
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*/
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gsi = acpi_fadt.sci_int;
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if (acpi_gsi_to_irq(gsi, &irq) < 0) {
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printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
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gsi);
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return AE_OK;
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}
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acpi_irq_handler = handler;
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acpi_irq_context = context;
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if (request_irq(irq, acpi_irq, SA_SHIRQ, "acpi", acpi_irq)) {
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printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
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return AE_NOT_ACQUIRED;
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}
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acpi_irq_irq = irq;
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return AE_OK;
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}
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acpi_status
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acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
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{
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if (irq) {
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free_irq(irq, acpi_irq);
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acpi_irq_handler = NULL;
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acpi_irq_irq = 0;
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}
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return AE_OK;
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}
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/*
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* Running in interpreter thread context, safe to sleep
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*/
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void
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acpi_os_sleep(acpi_integer ms)
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{
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current->state = TASK_INTERRUPTIBLE;
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schedule_timeout(((signed long) ms * HZ) / 1000);
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}
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EXPORT_SYMBOL(acpi_os_sleep);
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void
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acpi_os_stall(u32 us)
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{
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while (us) {
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u32 delay = 1000;
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if (delay > us)
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delay = us;
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udelay(delay);
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touch_nmi_watchdog();
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us -= delay;
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}
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}
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EXPORT_SYMBOL(acpi_os_stall);
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/*
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* Support ACPI 3.0 AML Timer operand
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* Returns 64-bit free-running, monotonically increasing timer
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* with 100ns granularity
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*/
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u64
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acpi_os_get_timer (void)
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{
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static u64 t;
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#ifdef CONFIG_HPET
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/* TBD: use HPET if available */
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#endif
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#ifdef CONFIG_X86_PM_TIMER
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/* TBD: default to PM timer if HPET was not available */
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#endif
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if (!t)
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printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
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return ++t;
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}
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acpi_status
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acpi_os_read_port(
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acpi_io_address port,
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u32 *value,
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u32 width)
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{
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u32 dummy;
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if (!value)
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value = &dummy;
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switch (width)
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{
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case 8:
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*(u8*) value = inb(port);
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break;
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case 16:
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*(u16*) value = inw(port);
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break;
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case 32:
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*(u32*) value = inl(port);
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break;
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default:
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BUG();
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}
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return AE_OK;
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}
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EXPORT_SYMBOL(acpi_os_read_port);
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acpi_status
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acpi_os_write_port(
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acpi_io_address port,
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u32 value,
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u32 width)
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{
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switch (width)
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{
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case 8:
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outb(value, port);
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break;
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case 16:
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outw(value, port);
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break;
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case 32:
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outl(value, port);
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break;
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default:
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BUG();
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}
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return AE_OK;
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}
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EXPORT_SYMBOL(acpi_os_write_port);
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acpi_status
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acpi_os_read_memory(
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acpi_physical_address phys_addr,
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u32 *value,
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u32 width)
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{
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u32 dummy;
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void __iomem *virt_addr;
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int iomem = 0;
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if (efi_enabled) {
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if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
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/* HACK ALERT! We can use readb/w/l on real memory too.. */
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virt_addr = (void __iomem *) phys_to_virt(phys_addr);
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} else {
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iomem = 1;
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virt_addr = ioremap(phys_addr, width);
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}
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} else
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virt_addr = (void __iomem *) phys_to_virt(phys_addr);
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if (!value)
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value = &dummy;
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switch (width) {
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case 8:
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*(u8*) value = readb(virt_addr);
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break;
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case 16:
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*(u16*) value = readw(virt_addr);
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break;
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case 32:
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*(u32*) value = readl(virt_addr);
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break;
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default:
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BUG();
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}
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if (efi_enabled) {
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if (iomem)
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iounmap(virt_addr);
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}
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return AE_OK;
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}
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acpi_status
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acpi_os_write_memory(
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acpi_physical_address phys_addr,
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u32 value,
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u32 width)
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{
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void __iomem *virt_addr;
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int iomem = 0;
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if (efi_enabled) {
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if (EFI_MEMORY_WB & efi_mem_attributes(phys_addr)) {
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/* HACK ALERT! We can use writeb/w/l on real memory too */
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virt_addr = (void __iomem *) phys_to_virt(phys_addr);
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} else {
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iomem = 1;
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virt_addr = ioremap(phys_addr, width);
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}
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} else
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virt_addr = (void __iomem *) phys_to_virt(phys_addr);
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switch (width) {
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case 8:
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writeb(value, virt_addr);
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break;
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case 16:
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writew(value, virt_addr);
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break;
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case 32:
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writel(value, virt_addr);
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break;
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default:
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BUG();
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}
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if (iomem)
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iounmap(virt_addr);
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return AE_OK;
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}
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#ifdef CONFIG_ACPI_PCI
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acpi_status
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acpi_os_read_pci_configuration (struct acpi_pci_id *pci_id, u32 reg, void *value, u32 width)
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{
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int result, size;
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if (!value)
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return AE_BAD_PARAMETER;
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switch (width) {
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case 8:
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size = 1;
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break;
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case 16:
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size = 2;
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break;
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case 32:
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size = 4;
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break;
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default:
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return AE_ERROR;
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}
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BUG_ON(!raw_pci_ops);
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result = raw_pci_ops->read(pci_id->segment, pci_id->bus,
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PCI_DEVFN(pci_id->device, pci_id->function),
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reg, size, value);
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return (result ? AE_ERROR : AE_OK);
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}
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EXPORT_SYMBOL(acpi_os_read_pci_configuration);
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acpi_status
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acpi_os_write_pci_configuration (struct acpi_pci_id *pci_id, u32 reg, acpi_integer value, u32 width)
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{
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int result, size;
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switch (width) {
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case 8:
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size = 1;
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break;
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case 16:
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size = 2;
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break;
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case 32:
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size = 4;
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break;
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default:
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return AE_ERROR;
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}
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BUG_ON(!raw_pci_ops);
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result = raw_pci_ops->write(pci_id->segment, pci_id->bus,
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PCI_DEVFN(pci_id->device, pci_id->function),
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reg, size, value);
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return (result ? AE_ERROR : AE_OK);
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}
|
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|
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/* TODO: Change code to take advantage of driver model more */
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static void
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acpi_os_derive_pci_id_2 (
|
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acpi_handle rhandle, /* upper bound */
|
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acpi_handle chandle, /* current node */
|
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struct acpi_pci_id **id,
|
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int *is_bridge,
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u8 *bus_number)
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|
{
|
|
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);
|
|
|
|
int __init
|
|
acpi_hotkey_setup(char *str)
|
|
{
|
|
acpi_specific_hotkey_enabled = FALSE;
|
|
return 1;
|
|
}
|
|
|
|
__setup("acpi_generic_hotkey", acpi_hotkey_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);
|