diff options
| author | Bob Moore <robert.moore@intel.com> | 2012-12-19 05:38:18 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-01-10 12:36:19 +0100 |
| commit | 2f3faaba5922d3763f3e9398a2b00dc7239e2d27 (patch) | |
| tree | 5b39a3fe111590f0820504a5a2f9192d7f7aa40d /drivers/acpi/acpica | |
| parent | 1f06c92110b4512beffc98656286fdc60ed00a85 (diff) | |
ACPICA: Add macros to extract flag bits from resource descriptors.
Improves readability and maintainability of the code. Fixes a
problem with the UART serial bus descriptor for the number of
data bits flags (was incorrectly 2 bits, should be 3).
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica')
| -rw-r--r-- | drivers/acpi/acpica/acmacros.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/acmacros.h b/drivers/acpi/acpica/acmacros.h index 5efad99f2169..1fa91f1d8994 100644 --- a/drivers/acpi/acpica/acmacros.h +++ b/drivers/acpi/acpica/acmacros.h @@ -293,6 +293,20 @@ #define ACPI_16BIT_MASK 0x0000FFFF #define ACPI_24BIT_MASK 0x00FFFFFF +/* Macros to extract flag bits from position zero */ + +#define ACPI_GET_1BIT_FLAG(value) ((value) & ACPI_1BIT_MASK) +#define ACPI_GET_2BIT_FLAG(value) ((value) & ACPI_2BIT_MASK) +#define ACPI_GET_3BIT_FLAG(value) ((value) & ACPI_3BIT_MASK) +#define ACPI_GET_4BIT_FLAG(value) ((value) & ACPI_4BIT_MASK) + +/* Macros to extract flag bits from position one and above */ + +#define ACPI_EXTRACT_1BIT_FLAG(field, position) (ACPI_GET_1BIT_FLAG ((field) >> position)) +#define ACPI_EXTRACT_2BIT_FLAG(field, position) (ACPI_GET_2BIT_FLAG ((field) >> position)) +#define ACPI_EXTRACT_3BIT_FLAG(field, position) (ACPI_GET_3BIT_FLAG ((field) >> position)) +#define ACPI_EXTRACT_4BIT_FLAG(field, position) (ACPI_GET_4BIT_FLAG ((field) >> position)) + /* * An object of type struct acpi_namespace_node can appear in some contexts * where a pointer to an object of type union acpi_operand_object can also |