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authorDavid Gibson <david@gibson.dropbear.id.au>2005-11-01 01:28:10 -0500
committerPaul Mackerras <paulus@samba.org>2005-11-01 05:49:02 -0500
commita0e60b2033b30a6bb8479629001cf98e58e4079a (patch)
tree6386eeca340a25c4ae1876f2f9663f94628c8cc3 /include/asm-ppc64/mmu_context.h
parent031ef0a72aa8f7ee63ae9f307c1bcff92b3ccc2c (diff)
[PATCH] powerpc: Merge bitops.h
Here's a revised version. This re-introduces the set_bits() function from ppc64, which I removed because I thought it was unused (it exists on no other arch). In fact it is used in the powermac interrupt code (but not on pSeries). - We use LARXL/STCXL macros to generate the right (32 or 64 bit) instructions, similar to LDL/STL from ppc_asm.h, used in fpu.S - ppc32 previously used a full "sync" barrier at the end of test_and_*_bit(), whereas ppc64 used an "isync". The merged version uses "isync", since I believe that's sufficient. - The ppc64 versions of then minix_*() bitmap functions have changed semantics. Previously on ppc64, these functions were big-endian (that is bit 0 was the LSB in the first 64-bit, big-endian word). On ppc32 (and x86, for that matter, they were little-endian. As far as I can tell, the big-endian usage was simply wrong - I guess no-one ever tried to use minixfs on ppc64. - On ppc32 find_next_bit() and find_next_zero_bit() are no longer inline (they were already out-of-line on ppc64). - For ppc64, sched_find_first_bit() has moved from mmu_context.h to the merged bitops. What it was doing in mmu_context.h in the first place, I have no idea. - The fls() function is now implemented using the cntlzw instruction on ppc64, instead of generic_fls(), as it already was on ppc32. - For ARCH=ppc, this patch requires adding arch/powerpc/lib to the arch/ppc/Makefile. This in turn requires some changes to arch/powerpc/lib/Makefile which didn't correctly handle ARCH=ppc. Built and running on G5. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include/asm-ppc64/mmu_context.h')
-rw-r--r--include/asm-ppc64/mmu_context.h15
1 files changed, 0 insertions, 15 deletions
diff --git a/include/asm-ppc64/mmu_context.h b/include/asm-ppc64/mmu_context.h
index 77a743402db4..820dd729b895 100644
--- a/include/asm-ppc64/mmu_context.h
+++ b/include/asm-ppc64/mmu_context.h
@@ -16,21 +16,6 @@
16 * 2 of the License, or (at your option) any later version. 16 * 2 of the License, or (at your option) any later version.
17 */ 17 */
18 18
19/*
20 * Every architecture must define this function. It's the fastest
21 * way of searching a 140-bit bitmap where the first 100 bits are
22 * unlikely to be set. It's guaranteed that at least one of the 140
23 * bits is cleared.
24 */
25static inline int sched_find_first_bit(unsigned long *b)
26{
27 if (unlikely(b[0]))
28 return __ffs(b[0]);
29 if (unlikely(b[1]))
30 return __ffs(b[1]) + 64;
31 return __ffs(b[2]) + 128;
32}
33
34static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) 19static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
35{ 20{
36} 21}