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Commit 2f3faaba authored by Bob Moore's avatar Bob Moore Committed by Rafael J. Wysocki
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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: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLv Zheng <lv.zheng@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 1f06c921

drivers/acpi/acpica/acmacros.h

+14 −0
Original line number Diff line number Diff line
@@ -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