#include <linux/config.h>
#include <linux/compiler.h>
#include <linux/types.h>
+#include <asm/bug.h>
#include <asm/byteorder.h> /* sigh ... */
#include <asm/cpu-features.h>
#define SZLONG_MASK 31UL
#define __LL "ll "
#define __SC "sc "
-#define __SET_MIPS ".set mips2 "
#define cpu_to_lelongp(x) cpu_to_le32p((__u32 *) (x))
#elif (_MIPS_SZLONG == 64)
#define SZLONG_LOG 6
#define SZLONG_MASK 63UL
#define __LL "lld "
#define __SC "scd "
-#define __SET_MIPS ".set mips3 "
#define cpu_to_lelongp(x) cpu_to_le64p((__u64 *) (x))
#endif
if (cpu_has_llsc && R10000_LLSC_WAR) {
__asm__ __volatile__(
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # set_bit \n"
" or %0, %2 \n"
" " __SC "%0, %1 \n"
: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
} else if (cpu_has_llsc) {
__asm__ __volatile__(
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # set_bit \n"
" or %0, %2 \n"
" " __SC "%0, %1 \n"
if (cpu_has_llsc && R10000_LLSC_WAR) {
__asm__ __volatile__(
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # clear_bit \n"
" and %0, %2 \n"
" " __SC "%0, %1 \n"
: "ir" (~(1UL << (nr & SZLONG_MASK))), "m" (*m));
} else if (cpu_has_llsc) {
__asm__ __volatile__(
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # clear_bit \n"
" and %0, %2 \n"
" " __SC "%0, %1 \n"
unsigned long temp;
__asm__ __volatile__(
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # change_bit \n"
" xor %0, %2 \n"
" " __SC "%0, %1 \n"
unsigned long temp;
__asm__ __volatile__(
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # change_bit \n"
" xor %0, %2 \n"
" " __SC "%0, %1 \n"
unsigned long temp, res;
__asm__ __volatile__(
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # test_and_set_bit \n"
" or %2, %0, %3 \n"
" " __SC "%2, %1 \n"
__asm__ __volatile__(
" .set push \n"
" .set noreorder \n"
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # test_and_set_bit \n"
" or %2, %0, %3 \n"
" " __SC "%2, %1 \n"
unsigned long temp, res;
__asm__ __volatile__(
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # test_and_clear_bit \n"
" or %2, %0, %3 \n"
" xor %2, %3 \n"
__asm__ __volatile__(
" .set push \n"
" .set noreorder \n"
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # test_and_clear_bit \n"
" or %2, %0, %3 \n"
" xor %2, %3 \n"
unsigned long temp, res;
__asm__ __volatile__(
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # test_and_change_bit \n"
" xor %2, %0, %3 \n"
" " __SC "%2, %1 \n"
__asm__ __volatile__(
" .set push \n"
" .set noreorder \n"
- " " __SET_MIPS " \n"
+ " .set mips3 \n"
"1: " __LL "%0, %1 # test_and_change_bit \n"
" xor %2, %0, %3 \n"
" " __SC "\t%2, %1 \n"
}
/*
- * ffz - find first zero in word.
+ * Return the bit position (0..63) of the most significant 1 bit in a word
+ * Returns -1 if no 1 bit exists
+ */
+static inline int __ilog2(unsigned long x)
+{
+ int lz;
+
+ if (sizeof(x) == 4) {
+ __asm__ (
+ " .set push \n"
+ " .set mips32 \n"
+ " clz %0, %1 \n"
+ " .set pop \n"
+ : "=r" (lz)
+ : "r" (x));
+
+ return 31 - lz;
+ }
+
+ BUG_ON(sizeof(x) != 8);
+
+ __asm__ (
+ " .set push \n"
+ " .set mips64 \n"
+ " dclz %0, %1 \n"
+ " .set pop \n"
+ : "=r" (lz)
+ : "r" (x));
+
+ return 63 - lz;
+}
+
+/*
+ * __ffs - find first bit in word.
* @word: The word to search
*
- * Undefined if no zero exists, so code should check against ~0UL first.
+ * Returns 0..SZLONG-1
+ * Undefined if no bit exists, so code should check against 0 first.
*/
-static inline unsigned long ffz(unsigned long word)
+static inline unsigned long __ffs(unsigned long word)
{
+#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
+ return __ilog2(word & -word);
+#else
int b = 0, s;
- word = ~word;
#ifdef CONFIG_32BIT
s = 16; if (word << 16 != 0) s = 0; b += s; word >>= s;
s = 8; if (word << 24 != 0) s = 0; b += s; word >>= s;
s = 4; if (word << 28 != 0) s = 0; b += s; word >>= s;
s = 2; if (word << 30 != 0) s = 0; b += s; word >>= s;
s = 1; if (word << 31 != 0) s = 0; b += s;
+
+ return b;
#endif
#ifdef CONFIG_64BIT
s = 32; if (word << 32 != 0) s = 0; b += s; word >>= s;
s = 4; if (word << 60 != 0) s = 0; b += s; word >>= s;
s = 2; if (word << 62 != 0) s = 0; b += s; word >>= s;
s = 1; if (word << 63 != 0) s = 0; b += s;
-#endif
return b;
+#endif
+#endif
}
/*
- * __ffs - find first bit in word.
+ * ffs - find first bit set.
* @word: The word to search
*
- * Undefined if no bit exists, so code should check against 0 first.
+ * Returns 1..SZLONG
+ * Returns 0 if no bit exists
*/
-static inline unsigned long __ffs(unsigned long word)
+
+static inline unsigned long ffs(unsigned long word)
{
- return ffz(~word);
+ if (!word)
+ return 0;
+
+ return __ffs(word) + 1;
}
/*
- * fls: find last bit set.
+ * ffz - find first zero in word.
+ * @word: The word to search
+ *
+ * Undefined if no zero exists, so code should check against ~0UL first.
*/
+static inline unsigned long ffz(unsigned long word)
+{
+ return __ffs (~word);
+}
-#define fls(x) generic_fls(x)
+/*
+ * fls - find last bit set.
+ * @word: The word to search
+ *
+ * Returns 1..SZLONG
+ * Returns 0 if no bit exists
+ */
+static inline unsigned long fls(unsigned long word)
+{
+#ifdef CONFIG_32BIT
+#ifdef CONFIG_CPU_MIPS32
+ __asm__ ("clz %0, %1" : "=r" (word) : "r" (word));
+
+ return 32 - word;
+#else
+ {
+ int r = 32, s;
+
+ if (word == 0)
+ return 0;
+
+ s = 16; if ((word & 0xffff0000)) s = 0; r -= s; word <<= s;
+ s = 8; if ((word & 0xff000000)) s = 0; r -= s; word <<= s;
+ s = 4; if ((word & 0xf0000000)) s = 0; r -= s; word <<= s;
+ s = 2; if ((word & 0xc0000000)) s = 0; r -= s; word <<= s;
+ s = 1; if ((word & 0x80000000)) s = 0; r -= s;
+
+ return r;
+ }
+#endif
+#endif /* CONFIG_32BIT */
+
+#ifdef CONFIG_64BIT
+#ifdef CONFIG_CPU_MIPS64
+
+ __asm__ ("dclz %0, %1" : "=r" (word) : "r" (word));
+
+ return 64 - word;
+#else
+ {
+ int r = 64, s;
+
+ if (word == 0)
+ return 0;
+
+ s = 32; if ((word & 0xffffffff00000000UL)) s = 0; r -= s; word <<= s;
+ s = 16; if ((word & 0xffff000000000000UL)) s = 0; r -= s; word <<= s;
+ s = 8; if ((word & 0xff00000000000000UL)) s = 0; r -= s; word <<= s;
+ s = 4; if ((word & 0xf000000000000000UL)) s = 0; r -= s; word <<= s;
+ s = 2; if ((word & 0xc000000000000000UL)) s = 0; r -= s; word <<= s;
+ s = 1; if ((word & 0x8000000000000000UL)) s = 0; r -= s;
+
+ return r;
+ }
+#endif
+#endif /* CONFIG_64BIT */
+}
+
+#define fls64(x) generic_fls64(x)
/*
* find_next_zero_bit - find the first zero bit in a memory region
#endif
}
-/*
- * ffs - find first bit set
- * @x: the word to search
- *
- * This is defined the same way as
- * the libc and compiler builtin ffs routines, therefore
- * differs in spirit from the above ffz (man ffs).
- */
-
-#define ffs(x) generic_ffs(x)
-
/*
* hweightN - returns the hamming weight of a N-bit word
* @x: the word to weigh
projects / powerpc.git / blobdiff