From ef7c4d4675d2a9206f913f26ca1a5cd41bff9d41 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 29 Jul 2011 09:42:07 -0700 Subject: sparc: Use popc if possible for hweight routines. Just like powerpc, we code patch at boot time. Signed-off-by: David S. Miller --- arch/sparc/kernel/setup_64.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'arch/sparc/kernel/setup_64.c') 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) -- cgit v1.2.1