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osl.c
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/*
* acpi_osl.c - OS-dependent functions ($Revision: 83 $)
*
* Copyright (C) 2000 Andrew Henroid
* Copyright (C) 2001, 2002 Andy Grover <[email protected]>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
* Copyright (c) 2008 Intel Corporation
* Author: Matthew Wilcox <[email protected]>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/kmod.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/nmi.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/jiffies.h>
#include <linux/semaphore.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include "internal.h"
#define _COMPONENT ACPI_OS_SERVICES
ACPI_MODULE_NAME("osl");
struct acpi_os_dpc {
acpi_osd_exec_callback function;
void *context;
struct work_struct work;
};
#ifdef CONFIG_ACPI_CUSTOM_DSDT
#include CONFIG_ACPI_CUSTOM_DSDT_FILE
#endif
#ifdef ENABLE_DEBUGGER
#include <linux/kdb.h>
/* stuff for debugger support */
int acpi_in_debugger;
EXPORT_SYMBOL(acpi_in_debugger);
#endif /*ENABLE_DEBUGGER */
static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
u32 pm1b_ctrl);
static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
u32 val_b);
static acpi_osd_handler acpi_irq_handler;
static void *acpi_irq_context;
static struct workqueue_struct *kacpid_wq;
static struct workqueue_struct *kacpi_notify_wq;
static struct workqueue_struct *kacpi_hotplug_wq;
static bool acpi_os_initialized;
unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
/*
* This list of permanent mappings is for memory that may be accessed from
* interrupt context, where we can't do the ioremap().
*/
struct acpi_ioremap {
struct list_head list;
void __iomem *virt;
acpi_physical_address phys;
acpi_size size;
unsigned long refcount;
};
static LIST_HEAD(acpi_ioremaps);
static DEFINE_MUTEX(acpi_ioremap_lock);
static void __init acpi_osi_setup_late(void);
/*
* The story of _OSI(Linux)
*
* From pre-history through Linux-2.6.22,
* Linux responded TRUE upon a BIOS OSI(Linux) query.
*
* Unfortunately, reference BIOS writers got wind of this
* and put OSI(Linux) in their example code, quickly exposing
* this string as ill-conceived and opening the door to
* an un-bounded number of BIOS incompatibilities.
*
* For example, OSI(Linux) was used on resume to re-POST a
* video card on one system, because Linux at that time
* could not do a speedy restore in its native driver.
* But then upon gaining quick native restore capability,
* Linux has no way to tell the BIOS to skip the time-consuming
* POST -- putting Linux at a permanent performance disadvantage.
* On another system, the BIOS writer used OSI(Linux)
* to infer native OS support for IPMI! On other systems,
* OSI(Linux) simply got in the way of Linux claiming to
* be compatible with other operating systems, exposing
* BIOS issues such as skipped device initialization.
*
* So "Linux" turned out to be a really poor chose of
* OSI string, and from Linux-2.6.23 onward we respond FALSE.
*
* BIOS writers should NOT query _OSI(Linux) on future systems.
* Linux will complain on the console when it sees it, and return FALSE.
* To get Linux to return TRUE for your system will require
* a kernel source update to add a DMI entry,
* or boot with "acpi_osi=Linux"
*/
static struct osi_linux {
unsigned int enable:1;
unsigned int dmi:1;
unsigned int cmdline:1;
unsigned int default_disabling:1;
} osi_linux = {0, 0, 0, 0};
static u32 acpi_osi_handler(acpi_string interface, u32 supported)
{
if (!strcmp("Linux", interface)) {
printk_once(KERN_NOTICE FW_BUG PREFIX
"BIOS _OSI(Linux) query %s%s\n",
osi_linux.enable ? "honored" : "ignored",
osi_linux.cmdline ? " via cmdline" :
osi_linux.dmi ? " via DMI" : "");
}
if (!strcmp("Darwin", interface)) {
/*
* Apple firmware will behave poorly if it receives positive
* answers to "Darwin" and any other OS. Respond positively
* to Darwin and then disable all other vendor strings.
*/
acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
supported = ACPI_UINT32_MAX;
}
return supported;
}
static void __init acpi_request_region (struct acpi_generic_address *gas,
unsigned int length, char *desc)
{
u64 addr;
/* Handle possible alignment issues */
memcpy(&addr, &gas->address, sizeof(addr));
if (!addr || !length)
return;
/* Resources are never freed */
if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
request_region(addr, length, desc);
else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
request_mem_region(addr, length, desc);
}
static int __init acpi_reserve_resources(void)
{
acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
"ACPI PM1a_EVT_BLK");
acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
"ACPI PM1b_EVT_BLK");
acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
"ACPI PM1a_CNT_BLK");
acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
"ACPI PM1b_CNT_BLK");
if (acpi_gbl_FADT.pm_timer_length == 4)
acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
"ACPI PM2_CNT_BLK");
/* Length of GPE blocks must be a non-negative multiple of 2 */
if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
return 0;
}
fs_initcall_sync(acpi_reserve_resources);
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(KERN_CONT "%s", buffer);
}
#else
if (acpi_debugger_write_log(buffer) < 0)
printk(KERN_CONT "%s", buffer);
#endif
}
#ifdef CONFIG_KEXEC
static unsigned long acpi_rsdp;
static int __init setup_acpi_rsdp(char *arg)
{
if (kstrtoul(arg, 16, &acpi_rsdp))
return -EINVAL;
return 0;
}
early_param("acpi_rsdp", setup_acpi_rsdp);
#endif
acpi_physical_address __init acpi_os_get_root_pointer(void)
{
#ifdef CONFIG_KEXEC
if (acpi_rsdp)
return acpi_rsdp;
#endif
if (efi_enabled(EFI_CONFIG_TABLES)) {
if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
return efi.acpi20;
else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
return efi.acpi;
else {
printk(KERN_ERR PREFIX
"System description tables not found\n");
return 0;
}
} else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
acpi_physical_address pa = 0;
acpi_find_root_pointer(&pa);
return pa;
}
return 0;
}
/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
static struct acpi_ioremap *
acpi_map_lookup(acpi_physical_address phys, acpi_size size)
{
struct acpi_ioremap *map;
list_for_each_entry_rcu(map, &acpi_ioremaps, list)
if (map->phys <= phys &&
phys + size <= map->phys + map->size)
return map;
return NULL;
}
/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
static void __iomem *
acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
{
struct acpi_ioremap *map;
map = acpi_map_lookup(phys, size);
if (map)
return map->virt + (phys - map->phys);
return NULL;
}
void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
{
struct acpi_ioremap *map;
void __iomem *virt = NULL;
mutex_lock(&acpi_ioremap_lock);
map = acpi_map_lookup(phys, size);
if (map) {
virt = map->virt + (phys - map->phys);
map->refcount++;
}
mutex_unlock(&acpi_ioremap_lock);
return virt;
}
EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
static struct acpi_ioremap *
acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
{
struct acpi_ioremap *map;
list_for_each_entry_rcu(map, &acpi_ioremaps, list)
if (map->virt <= virt &&
virt + size <= map->virt + map->size)
return map;
return NULL;
}
#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
/* ioremap will take care of cache attributes */
#define should_use_kmap(pfn) 0
#else
#define should_use_kmap(pfn) page_is_ram(pfn)
#endif
static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
{
unsigned long pfn;
pfn = pg_off >> PAGE_SHIFT;
if (should_use_kmap(pfn)) {
if (pg_sz > PAGE_SIZE)
return NULL;
return (void __iomem __force *)kmap(pfn_to_page(pfn));
} else
return acpi_os_ioremap(pg_off, pg_sz);
}
static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
{
unsigned long pfn;
pfn = pg_off >> PAGE_SHIFT;
if (should_use_kmap(pfn))
kunmap(pfn_to_page(pfn));
else
iounmap(vaddr);
}
/**
* acpi_os_map_iomem - Get a virtual address for a given physical address range.
* @phys: Start of the physical address range to map.
* @size: Size of the physical address range to map.
*
* Look up the given physical address range in the list of existing ACPI memory
* mappings. If found, get a reference to it and return a pointer to it (its
* virtual address). If not found, map it, add it to that list and return a
* pointer to it.
*
* During early init (when acpi_gbl_permanent_mmap has not been set yet) this
* routine simply calls __acpi_map_table() to get the job done.
*/
void __iomem *__init_refok
acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
{
struct acpi_ioremap *map;
void __iomem *virt;
acpi_physical_address pg_off;
acpi_size pg_sz;
if (phys > ULONG_MAX) {
printk(KERN_ERR PREFIX "Cannot map memory that high\n");
return NULL;
}
if (!acpi_gbl_permanent_mmap)
return __acpi_map_table((unsigned long)phys, size);
mutex_lock(&acpi_ioremap_lock);
/* Check if there's a suitable mapping already. */
map = acpi_map_lookup(phys, size);
if (map) {
map->refcount++;
goto out;
}
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (!map) {
mutex_unlock(&acpi_ioremap_lock);
return NULL;
}
pg_off = round_down(phys, PAGE_SIZE);
pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
virt = acpi_map(pg_off, pg_sz);
if (!virt) {
mutex_unlock(&acpi_ioremap_lock);
kfree(map);
return NULL;
}
INIT_LIST_HEAD(&map->list);
map->virt = virt;
map->phys = pg_off;
map->size = pg_sz;
map->refcount = 1;
list_add_tail_rcu(&map->list, &acpi_ioremaps);
out:
mutex_unlock(&acpi_ioremap_lock);
return map->virt + (phys - map->phys);
}
EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
void *__init_refok
acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
{
return (void *)acpi_os_map_iomem(phys, size);
}
EXPORT_SYMBOL_GPL(acpi_os_map_memory);
static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
{
if (!--map->refcount)
list_del_rcu(&map->list);
}
static void acpi_os_map_cleanup(struct acpi_ioremap *map)
{
if (!map->refcount) {
synchronize_rcu_expedited();
acpi_unmap(map->phys, map->virt);
kfree(map);
}
}
/**
* acpi_os_unmap_iomem - Drop a memory mapping reference.
* @virt: Start of the address range to drop a reference to.
* @size: Size of the address range to drop a reference to.
*
* Look up the given virtual address range in the list of existing ACPI memory
* mappings, drop a reference to it and unmap it if there are no more active
* references to it.
*
* During early init (when acpi_gbl_permanent_mmap has not been set yet) this
* routine simply calls __acpi_unmap_table() to get the job done. Since
* __acpi_unmap_table() is an __init function, the __ref annotation is needed
* here.
*/
void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
{
struct acpi_ioremap *map;
if (!acpi_gbl_permanent_mmap) {
__acpi_unmap_table(virt, size);
return;
}
mutex_lock(&acpi_ioremap_lock);
map = acpi_map_lookup_virt(virt, size);
if (!map) {
mutex_unlock(&acpi_ioremap_lock);
WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
return;
}
acpi_os_drop_map_ref(map);
mutex_unlock(&acpi_ioremap_lock);
acpi_os_map_cleanup(map);
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
{
return acpi_os_unmap_iomem((void __iomem *)virt, size);
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
{
if (!acpi_gbl_permanent_mmap)
__acpi_unmap_table(virt, size);
}
int acpi_os_map_generic_address(struct acpi_generic_address *gas)
{
u64 addr;
void __iomem *virt;
if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
return 0;
/* Handle possible alignment issues */
memcpy(&addr, &gas->address, sizeof(addr));
if (!addr || !gas->bit_width)
return -EINVAL;
virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
if (!virt)
return -EIO;
return 0;
}
EXPORT_SYMBOL(acpi_os_map_generic_address);
void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
{
u64 addr;
struct acpi_ioremap *map;
if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
return;
/* Handle possible alignment issues */
memcpy(&addr, &gas->address, sizeof(addr));
if (!addr || !gas->bit_width)
return;
mutex_lock(&acpi_ioremap_lock);
map = acpi_map_lookup(addr, gas->bit_width / 8);
if (!map) {
mutex_unlock(&acpi_ioremap_lock);
return;
}
acpi_os_drop_map_ref(map);
mutex_unlock(&acpi_ioremap_lock);
acpi_os_map_cleanup(map);
}
EXPORT_SYMBOL(acpi_os_unmap_generic_address);
#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
#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
static bool acpi_rev_override;
int __init acpi_rev_override_setup(char *str)
{
acpi_rev_override = true;
return 1;
}
__setup("acpi_rev_override", acpi_rev_override_setup);
#else
#define acpi_rev_override false
#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,
char **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;
}
if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
*new_val = (char *)5;
}
return AE_OK;
}
#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
#include <linux/earlycpio.h>
#include <linux/memblock.h>
static u64 acpi_tables_addr;
static int all_tables_size;
/* Copied from acpica/tbutils.c:acpi_tb_checksum() */
static u8 __init acpi_table_checksum(u8 *buffer, u32 length)
{
u8 sum = 0;
u8 *end = buffer + length;
while (buffer < end)
sum = (u8) (sum + *(buffer++));
return sum;
}
/* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
static const char * const table_sigs[] = {
ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, NULL };
#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
#define ACPI_OVERRIDE_TABLES 64
static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
void __init acpi_initrd_override(void *data, size_t size)
{
int sig, no, table_nr = 0, total_offset = 0;
long offset = 0;
struct acpi_table_header *table;
char cpio_path[32] = "kernel/firmware/acpi/";
struct cpio_data file;
if (data == NULL || size == 0)
return;
for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) {
file = find_cpio_data(cpio_path, data, size, &offset);
if (!file.data)
break;
data += offset;
size -= offset;
if (file.size < sizeof(struct acpi_table_header)) {
pr_err("ACPI OVERRIDE: Table smaller than ACPI header [%s%s]\n",
cpio_path, file.name);
continue;
}
table = file.data;
for (sig = 0; table_sigs[sig]; sig++)
if (!memcmp(table->signature, table_sigs[sig], 4))
break;
if (!table_sigs[sig]) {
pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
cpio_path, file.name);
continue;
}
if (file.size != table->length) {
pr_err("ACPI OVERRIDE: File length does not match table length [%s%s]\n",
cpio_path, file.name);
continue;
}
if (acpi_table_checksum(file.data, table->length)) {
pr_err("ACPI OVERRIDE: Bad table checksum [%s%s]\n",
cpio_path, file.name);
continue;
}
pr_info("%4.4s ACPI table found in initrd [%s%s][0x%x]\n",
table->signature, cpio_path, file.name, table->length);
all_tables_size += table->length;
acpi_initrd_files[table_nr].data = file.data;
acpi_initrd_files[table_nr].size = file.size;
table_nr++;
}
if (table_nr == 0)
return;
acpi_tables_addr =
memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
all_tables_size, PAGE_SIZE);
if (!acpi_tables_addr) {
WARN_ON(1);
return;
}
/*
* Only calling e820_add_reserve does not work and the
* tables are invalid (memory got used) later.
* memblock_reserve works as expected and the tables won't get modified.
* But it's not enough on X86 because ioremap will
* complain later (used by acpi_os_map_memory) that the pages
* that should get mapped are not marked "reserved".
* Both memblock_reserve and e820_add_region (via arch_reserve_mem_area)
* works fine.
*/
memblock_reserve(acpi_tables_addr, all_tables_size);
arch_reserve_mem_area(acpi_tables_addr, all_tables_size);
/*
* early_ioremap only can remap 256k one time. If we map all
* tables one time, we will hit the limit. Need to map chunks
* one by one during copying the same as that in relocate_initrd().
*/
for (no = 0; no < table_nr; no++) {
unsigned char *src_p = acpi_initrd_files[no].data;
phys_addr_t size = acpi_initrd_files[no].size;
phys_addr_t dest_addr = acpi_tables_addr + total_offset;
phys_addr_t slop, clen;
char *dest_p;
total_offset += size;
while (size) {
slop = dest_addr & ~PAGE_MASK;
clen = size;
if (clen > MAP_CHUNK_SIZE - slop)
clen = MAP_CHUNK_SIZE - slop;
dest_p = early_ioremap(dest_addr & PAGE_MASK,
clen + slop);
memcpy(dest_p + slop, src_p, clen);
early_iounmap(dest_p, clen + slop);
src_p += clen;
dest_addr += clen;
size -= clen;
}
}
}
#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
static void acpi_table_taint(struct acpi_table_header *table)
{
pr_warn(PREFIX
"Override [%4.4s-%8.8s], this is unsafe: tainting kernel\n",
table->signature, table->oem_table_id);
add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
}
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;
*new_table = NULL;
#ifdef CONFIG_ACPI_CUSTOM_DSDT
if (strncmp(existing_table->signature, "DSDT", 4) == 0)
*new_table = (struct acpi_table_header *)AmlCode;
#endif
if (*new_table != NULL)
acpi_table_taint(existing_table);
return AE_OK;
}
acpi_status
acpi_os_physical_table_override(struct acpi_table_header *existing_table,
acpi_physical_address *address,
u32 *table_length)
{
#ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
*table_length = 0;
*address = 0;
return AE_OK;
#else
int table_offset = 0;
struct acpi_table_header *table;
*table_length = 0;
*address = 0;
if (!acpi_tables_addr)
return AE_OK;
do {
if (table_offset + ACPI_HEADER_SIZE > all_tables_size) {
WARN_ON(1);
return AE_OK;
}
table = acpi_os_map_memory(acpi_tables_addr + table_offset,
ACPI_HEADER_SIZE);
if (table_offset + table->length > all_tables_size) {
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
WARN_ON(1);
return AE_OK;
}
table_offset += table->length;
if (memcmp(existing_table->signature, table->signature, 4)) {
acpi_os_unmap_memory(table,
ACPI_HEADER_SIZE);
continue;
}
/* Only override tables with matching oem id */
if (memcmp(table->oem_table_id, existing_table->oem_table_id,
ACPI_OEM_TABLE_ID_SIZE)) {
acpi_os_unmap_memory(table,
ACPI_HEADER_SIZE);
continue;
}
table_offset -= table->length;
*table_length = table->length;
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
*address = acpi_tables_addr + table_offset;
break;
} while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
if (*address != 0)
acpi_table_taint(existing_table);
return AE_OK;
#endif
}
static irqreturn_t acpi_irq(int irq, void *dev_id)
{
u32 handled;
handled = (*acpi_irq_handler) (acpi_irq_context);
if (handled) {
acpi_irq_handled++;
return IRQ_HANDLED;
} else {
acpi_irq_not_handled++;
return IRQ_NONE;
}
}
acpi_status
acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
void *context)
{
unsigned int irq;
acpi_irq_stats_init();
/*
* ACPI interrupts different from the SCI in our copy of the FADT are
* not supported.
*/
if (gsi != acpi_gbl_FADT.sci_interrupt)
return AE_BAD_PARAMETER;
if (acpi_irq_handler)
return AE_ALREADY_ACQUIRED;
if (acpi_gsi_to_irq(gsi, &irq) < 0) {
printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
gsi);
return AE_OK;
}
acpi_irq_handler = handler;
acpi_irq_context = context;
if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
acpi_irq_handler = NULL;
return AE_NOT_ACQUIRED;
}
acpi_sci_irq = irq;
return AE_OK;
}
acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
{
if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
return AE_BAD_PARAMETER;
free_irq(acpi_sci_irq, acpi_irq);
acpi_irq_handler = NULL;
acpi_sci_irq = INVALID_ACPI_IRQ;
return AE_OK;
}
/*
* Running in interpreter thread context, safe to sleep
*/
void acpi_os_sleep(u64 ms)
{
msleep(ms);
}
void acpi_os_stall(u32 us)
{
while (us) {
u32 delay = 1000;
if (delay > us)
delay = us;
udelay(delay);
touch_nmi_watchdog();
us -= delay;
}
}
/*
* Support ACPI 3.0 AML Timer operand
* Returns 64-bit free-running, monotonically increasing timer
* with 100ns granularity
*/
u64 acpi_os_get_timer(void)
{
u64 time_ns = ktime_to_ns(ktime_get());
do_div(time_ns, 100);
return time_ns;
}
acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
{
u32 dummy;
if (!value)
value = &dummy;
*value = 0;
if (width <= 8) {
*(u8 *) value = inb(port);
} else if (width <= 16) {
*(u16 *) value = inw(port);
} else if (width <= 32) {
*(u32 *) value = inl(port);
} else {
BUG();
}
return AE_OK;
}
EXPORT_SYMBOL(acpi_os_read_port);
acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
{
if (width <= 8) {
outb(value, port);
} else if (width <= 16) {
outw(value, port);
} else if (width <= 32) {
outl(value, port);
} else {
BUG();
}
return AE_OK;
}
EXPORT_SYMBOL(acpi_os_write_port);
acpi_status
acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
{
void __iomem *virt_addr;
unsigned int size = width / 8;
bool unmap = false;
u64 dummy;
rcu_read_lock();
virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
if (!virt_addr) {
rcu_read_unlock();
virt_addr = acpi_os_ioremap(phys_addr, size);
if (!virt_addr)
return AE_BAD_ADDRESS;
unmap = true;
}
if (!value)
value = &dummy;
switch (width) {
case 8: