[LIBFS] IA64 & PPC aren't making use of this right now, but it's silly to

have the build fail for some trivial x86 specific assembly.  I snagged the
appropriate bitops for ia64 and ppc (untested) and tossed in an
unoptimized option as well in case we want to make use of it.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/tools/libfsimage/ext2fs/fsys_ext2fs.c b/tools/libfsimage/ext2fs/fsys_ext2fs.c
index d6c305238e..c4e4c863bd 100644
--- a/tools/libfsimage/ext2fs/fsys_ext2fs.c
+++ b/tools/libfsimage/ext2fs/fsys_ext2fs.c
@@ -232,6 +232,7 @@ struct ext2_dir_entry
 #define S_ISREG(m)      (((m) & S_IFMT) == S_IFREG)
 #define S_ISDIR(m)      (((m) & S_IFMT) == S_IFDIR)
 
+#if defined(__i386__) || defined(__x86_64__)
 /* include/asm-i386/bitops.h */
 /*
  * ffz = Find First Zero in word. Undefined if no zero exists,
@@ -251,6 +252,66 @@ ffz (unsigned long word)
   return word;
 }
 
+#elif defined(__ia64__)
+
+typedef unsigned long __u64;
+
+#if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+# define ia64_popcnt(x) __builtin_popcountl(x)
+#else
+# define ia64_popcnt(x)                                     \
+  ({                                                        \
+    __u64 ia64_intri_res;                                   \
+    asm ("popcnt %0=%1" : "=r" (ia64_intri_res) : "r" (x)); \
+    ia64_intri_res;                                         \
+  })
+#endif
+
+static __inline__ unsigned long
+ffz (unsigned long word)
+{
+  unsigned long result;
+
+  result = ia64_popcnt(word & (~word - 1));
+  return result;
+}
+
+#elif defined(__powerpc__)
+
+static __inline__ int
+__ilog2(unsigned long x)
+{
+  int lz;
+
+  asm (PPC_CNTLZL "%0,%1" : "=r" (lz) : "r" (x));
+  return BITS_PER_LONG - 1 - lz;
+}
+
+static __inline__ unsigned long
+ffz (unsigned long word)
+{
+  if ((word = ~word) == 0)
+    return BITS_PER_LONG;
+  return __ilog2(word & -word);
+}
+
+#else /* Unoptimized */
+
+static __inline__ unsigned long
+ffz (unsigned long word)
+{
+  unsigned long result;
+
+  result = 0;
+  while(word & 1)
+    {
+      result++;
+      word >>= 1;
+    }
+  return result;
+}
+#endif
+
 /* check filesystem types and read superblock into memory buffer */
 int
 ext2fs_mount (fsi_file_t *ffi)