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sparc: Use popc if possible for hweight routines.

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Just like powerpc, we code patch at boot time.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2011-07-29 09:42:07 -07:00
parent e95ade0839
commit ef7c4d4675
7 changed files with 102 additions and 40 deletions
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27
arch/sparc/kernel/setup_64.c
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@@ -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)