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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2005-10-12 14:22:50 +1000
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-12 08:24:47 -0700
commitd8e998c58a870770905495a1d45ebf7285b5b1c5 (patch)
tree828a1633c667c0769feec6451aa450bbfb911a10 /arch/ppc/kernel
parentcbd27b8ced4b1888c93f69b4dd108a69ac4d733f (diff)
[PATCH] ppc32: Tell userland about lack of standard TB
Glibc is about to get some new high precision timer stuff that relies on the standard timebase of the PPC architecture. However, some (rare & old) CPUs do not have such timebase and it is a bit annoying to have your stuff just crash because you are running on the wrong CPU... This exposes to userland a CPU feature bit that tells that the current processor doesn't have a standard timebase. It's negative logic so that glibc will still "just work" on older kernels (it will just be unhappy on those old CPUs but that doesn't really matter as distro tend to update glibc & kernel at the same time). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ppc/kernel')
-rw-r--r--arch/ppc/kernel/cputable.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/ppc/kernel/cputable.c b/arch/ppc/kernel/cputable.c
index 546e1ea4caf..6b76cf58d9e 100644
--- a/arch/ppc/kernel/cputable.c
+++ b/arch/ppc/kernel/cputable.c
@@ -91,7 +91,7 @@ struct cpu_spec cpu_specs[] = {
.cpu_features = CPU_FTR_COMMON | CPU_FTR_601 |
CPU_FTR_HPTE_TABLE,
.cpu_user_features = COMMON_PPC | PPC_FEATURE_601_INSTR |
- PPC_FEATURE_UNIFIED_CACHE,
+ PPC_FEATURE_UNIFIED_CACHE | PPC_FEATURE_NO_TB,
.icache_bsize = 32,
.dcache_bsize = 32,
.cpu_setup = __setup_cpu_601
@@ -745,7 +745,8 @@ struct cpu_spec cpu_specs[] = {
.cpu_name = "403GCX",
.cpu_features = CPU_FTR_SPLIT_ID_CACHE |
CPU_FTR_USE_TB,
- .cpu_user_features = PPC_FEATURE_32 | PPC_FEATURE_HAS_MMU,
+ .cpu_user_features = PPC_FEATURE_32 |
+ PPC_FEATURE_HAS_MMU | PPC_FEATURE_NO_TB,
.icache_bsize = 16,
.dcache_bsize = 16,
},