On Wed, 27 Feb 2019 18:02:36 +0100, Jani Nikula <[email protected]>
wrote:
@@ -116,6 +116,34 @@
* #define GEN8_BAR _MMIO(0xb888)
*/
+/**
+ * REG_BIT() - Prepare a u32 bit value
+ * @__n: 0-based bit number
+ *
+ * Local wrapper for BIT() to force u32, with compile time checks.
+ *
+ * @return: Value with bit @__n set.
+ */
+#define REG_BIT(__n) \
+ ((u32)(BIT(__n) + \
+ BUILD_BUG_ON_ZERO(__builtin_constant_p(__n) && \
+ ((__n) < 0 || (__n) > 31))))
Maybe to simplify the code we can define this macro using macro below:
#define REG_BIT(__n) REG_GENMASK(__n, __n)
+
+/**
+ * REG_GENMASK() - Prepare a continuous u32 bitmask
+ * @__high: 0-based high bit
+ * @__low: 0-based low bit
+ *
+ * Local wrapper for GENMASK() to force u32, with compile time checks.
+ *
+ * @return: Continuous bitmask from @__high to @__low, inclusive.
+ */
+#define REG_GENMASK(__high, __low) \
+ ((u32)(GENMASK(__high, __low) + \
+ BUILD_BUG_ON_ZERO(__builtin_constant_p(__high) && \
+ __builtin_constant_p(__low) && \
+ ((__low) < 0 || (__high) > 31 || (__low) >
(__high)))))
+
nit: Since we are defining new set of macros, do we really have to follow
naming of the underlying macros? maybe we can can have clear new names:
REG_BIT(n)
REG_BITS(hi,low)
Thanks,
Michal
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