diff options
Diffstat (limited to 'include/acpi')
| -rw-r--r-- | include/acpi/actbl.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/acpi/actbl.h b/include/acpi/actbl.h index d92543f3bbfd..bdc55c0da19c 100644 --- a/include/acpi/actbl.h +++ b/include/acpi/actbl.h @@ -374,6 +374,20 @@ struct acpi_table_desc { u16 validation_count; }; +/* + * Maximum value of the validation_count field in struct acpi_table_desc. + * When reached, validation_count cannot be changed any more and the table will + * be permanently regarded as validated. + * + * This is to prevent situations in which unbalanced table get/put operations + * may cause premature table unmapping in the OS to happen. + * + * The maximum validation count can be defined to any value, but should be + * greater than the maximum number of OS early stage mapping slots to avoid + * leaking early stage table mappings to the late stage. + */ +#define ACPI_MAX_TABLE_VALIDATIONS ACPI_UINT16_MAX + /* Masks for Flags field above */ #define ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL (0) /* Virtual address, external maintained */ |