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authorMikael Starvik <mikael.starvik@axis.com>2005-07-27 11:44:44 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-27 16:26:01 -0700
commit51533b615e605d86154ec1b4e585c8ca1b0b15b7 (patch)
tree4a6d7d8494d2017632d83624fb71b36031e0e7e5 /include/asm-cris/arch-v32/bitops.h
parent5d01e6ce785884a5db5792cd2e5bb36fa82fe23c (diff)
[PATCH] CRIS update: new subarchitecture v32
New CRIS sub architecture named v32. From: Dave Jones <davej@redhat.com> Fix swapped kmalloc args Signed-off-by: Mikael Starvik <starvik@axis.com> Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-cris/arch-v32/bitops.h')
-rw-r--r--include/asm-cris/arch-v32/bitops.h64
1 files changed, 64 insertions, 0 deletions
diff --git a/include/asm-cris/arch-v32/bitops.h b/include/asm-cris/arch-v32/bitops.h
new file mode 100644
index 00000000000..e40a58d3b86
--- /dev/null
+++ b/include/asm-cris/arch-v32/bitops.h
@@ -0,0 +1,64 @@
+#ifndef _ASM_CRIS_ARCH_BITOPS_H
+#define _ASM_CRIS_ARCH_BITOPS_H
+
+/*
+ * Helper functions for the core of the ff[sz] functions. They compute the
+ * number of leading zeroes of a bits-in-byte, byte-in-word and
+ * word-in-dword-swapped number. They differ in that the first function also
+ * inverts all bits in the input.
+ */
+
+extern inline unsigned long
+cris_swapnwbrlz(unsigned long w)
+{
+ unsigned long res;
+
+ __asm__ __volatile__ ("swapnwbr %0\n\t"
+ "lz %0,%0"
+ : "=r" (res) : "0" (w));
+
+ return res;
+}
+
+extern inline unsigned long
+cris_swapwbrlz(unsigned long w)
+{
+ unsigned long res;
+
+ __asm__ __volatile__ ("swapwbr %0\n\t"
+ "lz %0,%0"
+ : "=r" (res) : "0" (w));
+
+ return res;
+}
+
+/*
+ * Find First Zero in word. Undefined if no zero exist, so the caller should
+ * check against ~0 first.
+ */
+extern inline unsigned long
+ffz(unsigned long w)
+{
+ return cris_swapnwbrlz(w);
+}
+
+/*
+ * Find First Set bit in word. Undefined if no 1 exist, so the caller
+ * should check against 0 first.
+ */
+extern inline unsigned long
+__ffs(unsigned long w)
+{
+ return cris_swapnwbrlz(~w);
+}
+
+/*
+ * Find First Bit that is set.
+ */
+extern inline unsigned long
+kernel_ffs(unsigned long w)
+{
+ return w ? cris_swapwbrlz (w) + 1 : 0;
+}
+
+#endif /* _ASM_CRIS_ARCH_BITOPS_H */