* @nr: the bit to set
* @addr: the address to start counting from
*/
-static inline void set_bit(int nr, volatile unsigned long *addr)
+static inline void set_bit(int nr, unsigned long *addr)
{
unsigned long mask = BIT_MASK(nr);
- unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+ unsigned long *p = addr + BIT_WORD(nr);
*p |= mask;
}
* @nr: Bit to clear
* @addr: Address to start counting from
*/
-static inline void clear_bit(int nr, volatile unsigned long *addr)
+static inline void clear_bit(int nr, unsigned long *addr)
{
unsigned long mask = BIT_MASK(nr);
- unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+ unsigned long *p = addr + BIT_WORD(nr);
*p &= ~mask;
}
* @nr: Bit to change
* @addr: Address to start counting from
*/
-static inline void change_bit(int nr, volatile unsigned long *addr)
+static inline void change_bit(int nr, unsigned long *addr)
{
unsigned long mask = BIT_MASK(nr);
- unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+ unsigned long *p = addr + BIT_WORD(nr);
*p ^= mask;
}
* @nr: Bit to set
* @addr: Address to count from
*/
-static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
+static inline int test_and_set_bit(int nr, unsigned long *addr)
{
unsigned long mask = BIT_MASK(nr);
- unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+ unsigned long *p = addr + BIT_WORD(nr);
unsigned long old = *p;
*p = old | mask;
* @nr: Bit to clear
* @addr: Address to count from
*/
-static inline int test_and_clear_bit(int nr, volatile unsigned long *addr)
+static inline int test_and_clear_bit(int nr, unsigned long *addr)
{
unsigned long mask = BIT_MASK(nr);
- unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+ unsigned long *p = addr + BIT_WORD(nr);
unsigned long old = *p;
*p = old & ~mask;
* @nr: Bit to change
* @addr: Address to count from
*/
-static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
+static inline int test_and_change_bit(int nr, unsigned long *addr)
{
unsigned long mask = BIT_MASK(nr);
- unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
+ unsigned long *p = addr + BIT_WORD(nr);
unsigned long old = *p;
*p = old ^ mask;
* @nr: bit number to test
* @addr: Address to start counting from
*/
-static inline int test_bit(int nr, const volatile unsigned long *addr)
+static inline int test_bit(int nr, const unsigned long *addr)
{
return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
}
return count;
}
+/**
+ * extract32:
+ * @value: the value to extract the bit field from
+ * @start: the lowest bit in the bit field (numbered from 0)
+ * @length: the length of the bit field
+ *
+ * Extract from the 32 bit input @value the bit field specified by the
+ * @start and @length parameters, and return it. The bit field must
+ * lie entirely within the 32 bit word. It is valid to request that
+ * all 32 bits are returned (ie @length 32 and @start 0).
+ *
+ * Returns: the value of the bit field extracted from the input value.
+ */
+static inline uint32_t extract32(uint32_t value, int start, int length)
+{
+ assert(start >= 0 && length > 0 && length <= 32 - start);
+ return (value >> start) & (~0U >> (32 - length));
+}
+
+/**
+ * extract64:
+ * @value: the value to extract the bit field from
+ * @start: the lowest bit in the bit field (numbered from 0)
+ * @length: the length of the bit field
+ *
+ * Extract from the 64 bit input @value the bit field specified by the
+ * @start and @length parameters, and return it. The bit field must
+ * lie entirely within the 64 bit word. It is valid to request that
+ * all 64 bits are returned (ie @length 64 and @start 0).
+ *
+ * Returns: the value of the bit field extracted from the input value.
+ */
+static inline uint64_t extract64(uint64_t value, int start, int length)
+{
+ assert(start >= 0 && length > 0 && length <= 64 - start);
+ return (value >> start) & (~0ULL >> (64 - length));
+}
+
+/**
+ * deposit32:
+ * @value: initial value to insert bit field into
+ * @start: the lowest bit in the bit field (numbered from 0)
+ * @length: the length of the bit field
+ * @fieldval: the value to insert into the bit field
+ *
+ * Deposit @fieldval into the 32 bit @value at the bit field specified
+ * by the @start and @length parameters, and return the modified
+ * @value. Bits of @value outside the bit field are not modified.
+ * Bits of @fieldval above the least significant @length bits are
+ * ignored. The bit field must lie entirely within the 32 bit word.
+ * It is valid to request that all 32 bits are modified (ie @length
+ * 32 and @start 0).
+ *
+ * Returns: the modified @value.
+ */
+static inline uint32_t deposit32(uint32_t value, int start, int length,
+ uint32_t fieldval)
+{
+ uint32_t mask;
+ assert(start >= 0 && length > 0 && length <= 32 - start);
+ mask = (~0U >> (32 - length)) << start;
+ return (value & ~mask) | ((fieldval << start) & mask);
+}
+
+/**
+ * deposit64:
+ * @value: initial value to insert bit field into
+ * @start: the lowest bit in the bit field (numbered from 0)
+ * @length: the length of the bit field
+ * @fieldval: the value to insert into the bit field
+ *
+ * Deposit @fieldval into the 64 bit @value at the bit field specified
+ * by the @start and @length parameters, and return the modified
+ * @value. Bits of @value outside the bit field are not modified.
+ * Bits of @fieldval above the least significant @length bits are
+ * ignored. The bit field must lie entirely within the 64 bit word.
+ * It is valid to request that all 64 bits are modified (ie @length
+ * 64 and @start 0).
+ *
+ * Returns: the modified @value.
+ */
+static inline uint64_t deposit64(uint64_t value, int start, int length,
+ uint64_t fieldval)
+{
+ uint64_t mask;
+ assert(start >= 0 && length > 0 && length <= 64 - start);
+ mask = (~0ULL >> (64 - length)) << start;
+ return (value & ~mask) | ((fieldval << start) & mask);
+}
+
#endif