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authorJan Glauber <jang@linux.vnet.ibm.com>2012-11-29 13:01:15 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-11-30 15:40:48 +0100
commite56e4e87e370a0f121450d52337969aa1be21ff7 (patch)
tree9d1c94149a13454dc1f4b9c7cb2b1de680625ec5 /arch/s390
parenta755a45dd928e05a4fb980d31d4a0dbc49adc562 (diff)
s390/bitops: find leftmost bit instruction support
The flogr instruction scans a bitmap starting from the leftmost bit. Implement support for these bitops. This could be useful to scan bitmaps like an interrupt vector set by the hardware starting at the leftmost bit. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/bitops.h81
1 files changed, 81 insertions, 0 deletions
diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h
index 6f573890fb28..15422933c60b 100644
--- a/arch/s390/include/asm/bitops.h
+++ b/arch/s390/include/asm/bitops.h
@@ -640,6 +640,87 @@ static inline unsigned long find_first_bit(const unsigned long * addr,
}
#define find_first_bit find_first_bit
+/*
+ * Big endian variant whichs starts bit counting from left using
+ * the flogr (find leftmost one) instruction.
+ */
+static inline unsigned long __flo_word(unsigned long nr, unsigned long val)
+{
+ register unsigned long bit asm("2") = val;
+ register unsigned long out asm("3");
+
+ asm volatile (
+ " .insn rre,0xb9830000,%[bit],%[bit]\n"
+ : [bit] "+d" (bit), [out] "=d" (out) : : "cc");
+ return nr + bit;
+}
+
+/*
+ * 64 bit special left bitops format:
+ * order in memory:
+ * 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
+ * 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
+ * 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f
+ * 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f
+ * after that follows the next long with bit numbers
+ * 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f
+ * 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f
+ * 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f
+ * 70 71 72 73 74 75 76 77 78 79 7a 7b 7c 7d 7e 7f
+ * The reason for this bit ordering is the fact that
+ * the hardware sets bits in a bitmap starting at bit 0
+ * and we don't want to scan the bitmap from the 'wrong
+ * end'.
+ */
+static inline unsigned long find_first_bit_left(const unsigned long *addr,
+ unsigned long size)
+{
+ unsigned long bytes, bits;
+
+ if (!size)
+ return 0;
+ bytes = __ffs_word_loop(addr, size);
+ bits = __flo_word(bytes * 8, __load_ulong_be(addr, bytes));
+ return (bits < size) ? bits : size;
+}
+
+static inline int find_next_bit_left(const unsigned long *addr,
+ unsigned long size,
+ unsigned long offset)
+{
+ const unsigned long *p;
+ unsigned long bit, set;
+
+ if (offset >= size)
+ return size;
+ bit = offset & (__BITOPS_WORDSIZE - 1);
+ offset -= bit;
+ size -= offset;
+ p = addr + offset / __BITOPS_WORDSIZE;
+ if (bit) {
+ set = __flo_word(0, *p & (~0UL << bit));
+ if (set >= size)
+ return size + offset;
+ if (set < __BITOPS_WORDSIZE)
+ return set + offset;
+ offset += __BITOPS_WORDSIZE;
+ size -= __BITOPS_WORDSIZE;
+ p++;
+ }
+ return offset + find_first_bit_left(p, size);
+}
+
+#define for_each_set_bit_left(bit, addr, size) \
+ for ((bit) = find_first_bit_left((addr), (size)); \
+ (bit) < (size); \
+ (bit) = find_next_bit_left((addr), (size), (bit) + 1))
+
+/* same as for_each_set_bit() but use bit as value to start with */
+#define for_each_set_bit_left_cont(bit, addr, size) \
+ for ((bit) = find_next_bit_left((addr), (size), (bit)); \
+ (bit) < (size); \
+ (bit) = find_next_bit_left((addr), (size), (bit) + 1))
+
/**
* find_next_zero_bit - find the first zero bit in a memory region
* @addr: The address to base the search on