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authorDavid S. Miller <davem@davemloft.net>2011-07-29 09:42:07 -0700
committerDavid S. Miller <davem@davemloft.net>2011-08-02 21:28:50 -0700
commitef7c4d4675d2a9206f913f26ca1a5cd41bff9d41 (patch)
tree88839b80e603ba395882df98b8a8c8f8385337b1 /arch/sparc/kernel/setup_64.c
parente95ade083939dcb4b0c51c1a2c8504ea9ef3d6ef (diff)
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sparc: Use popc if possible for hweight routines.
Just like powerpc, we code patch at boot time. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/setup_64.c')
-rw-r--r--arch/sparc/kernel/setup_64.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 242dbb3f31d2..26d114187e10 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -272,6 +272,30 @@ void __init sun4v_patch(void)
sun4v_hvapi_init();
}
+static void __init popc_patch(void)
+{
+ struct popc_3insn_patch_entry *p3;
+
+ p3 = &__popc_3insn_patch;
+ while (p3 < &__popc_3insn_patch_end) {
+ unsigned long addr = p3->addr;
+
+ *(unsigned int *) (addr + 0) = p3->insns[0];
+ wmb();
+ __asm__ __volatile__("flush %0" : : "r" (addr + 0));
+
+ *(unsigned int *) (addr + 4) = p3->insns[1];
+ wmb();
+ __asm__ __volatile__("flush %0" : : "r" (addr + 4));
+
+ *(unsigned int *) (addr + 8) = p3->insns[2];
+ wmb();
+ __asm__ __volatile__("flush %0" : : "r" (addr + 4));
+
+ p3++;
+ }
+}
+
#ifdef CONFIG_SMP
void __init boot_cpu_id_too_large(int cpu)
{
@@ -424,6 +448,9 @@ static void __init init_sparc64_elf_hwcap(void)
sparc64_elf_hwcap = cap | mdesc_caps;
report_hwcaps(sparc64_elf_hwcap);
+
+ if (sparc64_elf_hwcap & AV_SPARC_POPC)
+ popc_patch();
}
void __init setup_arch(char **cmdline_p)