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path: root/drivers/acpi/osl.c
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Diffstat (limited to 'drivers/acpi/osl.c')
-rw-r--r--drivers/acpi/osl.c174
1 files changed, 109 insertions, 65 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 67da6fb72..f03677588 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -135,7 +135,7 @@ static struct osi_linux {
unsigned int enable:1;
unsigned int dmi:1;
unsigned int cmdline:1;
- unsigned int default_disabling:1;
+ u8 default_disabling;
} osi_linux = {0, 0, 0, 0};
static u32 acpi_osi_handler(acpi_string interface, u32 supported)
@@ -602,6 +602,14 @@ acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
return AE_OK;
}
+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);
+}
+
#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
#include <linux/earlycpio.h>
#include <linux/memblock.h>
@@ -636,6 +644,7 @@ static const char * const table_sigs[] = {
#define ACPI_OVERRIDE_TABLES 64
static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES];
+static DECLARE_BITMAP(acpi_initrd_installed, ACPI_OVERRIDE_TABLES);
#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
@@ -746,96 +755,125 @@ void __init acpi_initrd_override(void *data, size_t size)
}
}
}
-#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
-static void acpi_table_taint(struct acpi_table_header *table)
+acpi_status
+acpi_os_physical_table_override(struct acpi_table_header *existing_table,
+ acpi_physical_address *address, u32 *length)
{
- 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);
-}
+ int table_offset = 0;
+ int table_index = 0;
+ struct acpi_table_header *table;
+ u32 table_length;
+ *length = 0;
+ *address = 0;
+ if (!acpi_tables_addr)
+ return AE_OK;
-acpi_status
-acpi_os_table_override(struct acpi_table_header * existing_table,
- struct acpi_table_header ** new_table)
-{
- if (!existing_table || !new_table)
- return AE_BAD_PARAMETER;
+ while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
+ 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;
+ }
- *new_table = NULL;
+ table_length = table->length;
-#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)
+ /* Only override tables matched */
+ if (test_bit(table_index, acpi_initrd_installed) ||
+ memcmp(existing_table->signature, table->signature, 4) ||
+ memcmp(table->oem_table_id, existing_table->oem_table_id,
+ ACPI_OEM_TABLE_ID_SIZE)) {
+ acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
+ goto next_table;
+ }
+
+ *length = table_length;
+ *address = acpi_tables_addr + table_offset;
acpi_table_taint(existing_table);
+ acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
+ set_bit(table_index, acpi_initrd_installed);
+ break;
+
+next_table:
+ table_offset += table_length;
+ table_index++;
+ }
return AE_OK;
}
-acpi_status
-acpi_os_physical_table_override(struct acpi_table_header *existing_table,
- acpi_physical_address *address,
- u32 *table_length)
+void __init acpi_initrd_initialize_tables(void)
{
-#ifndef CONFIG_ACPI_INITRD_TABLE_OVERRIDE
- *table_length = 0;
- *address = 0;
- return AE_OK;
-#else
int table_offset = 0;
+ int table_index = 0;
+ u32 table_length;
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;
- }
+ return;
+ while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
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;
+ return;
}
- table_offset += table->length;
+ table_length = 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;
+ /* Skip RSDT/XSDT which should only be used for override */
+ if (test_bit(table_index, acpi_initrd_installed) ||
+ ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) ||
+ ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) {
+ acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
+ goto next_table;
}
- table_offset -= table->length;
- *table_length = table->length;
+ acpi_table_taint(table);
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
- *address = acpi_tables_addr + table_offset;
- break;
- } while (table_offset + ACPI_HEADER_SIZE < all_tables_size);
+ acpi_install_table(acpi_tables_addr + table_offset, TRUE);
+ set_bit(table_index, acpi_initrd_installed);
+next_table:
+ table_offset += table_length;
+ table_index++;
+ }
+}
+#else
+acpi_status
+acpi_os_physical_table_override(struct acpi_table_header *existing_table,
+ acpi_physical_address *address,
+ u32 *table_length)
+{
+ *table_length = 0;
+ *address = 0;
+ return AE_OK;
+}
+
+void __init acpi_initrd_initialize_tables(void)
+{
+}
+#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
- if (*address != 0)
+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;
-#endif
}
static irqreturn_t acpi_irq(int irq, void *dev_id)
@@ -1713,10 +1751,13 @@ void __init acpi_osi_setup(char *str)
if (*str == '!') {
str++;
if (*str == '\0') {
- osi_linux.default_disabling = 1;
+ /* Do not override acpi_osi=!* */
+ if (!osi_linux.default_disabling)
+ osi_linux.default_disabling =
+ ACPI_DISABLE_ALL_VENDOR_STRINGS;
return;
} else if (*str == '*') {
- acpi_update_interfaces(ACPI_DISABLE_ALL_STRINGS);
+ osi_linux.default_disabling = ACPI_DISABLE_ALL_STRINGS;
for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
osi = &osi_setup_entries[i];
osi->enable = false;
@@ -1789,10 +1830,13 @@ static void __init acpi_osi_setup_late(void)
acpi_status status;
if (osi_linux.default_disabling) {
- status = acpi_update_interfaces(ACPI_DISABLE_ALL_VENDOR_STRINGS);
+ status = acpi_update_interfaces(osi_linux.default_disabling);
if (ACPI_SUCCESS(status))
- printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors\n");
+ printk(KERN_INFO PREFIX "Disabled all _OSI OS vendors%s\n",
+ osi_linux.default_disabling ==
+ ACPI_DISABLE_ALL_STRINGS ?
+ " and feature groups" : "");
}
for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-05 00:43:08 +0000