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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
sparc64: Define SPARC default __fls function
__fls will now require a boot time patching on T4 and above.
Redefining it under arch/sparc/lib.
Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
authored by
Vijay Kumar
and committed by
David S. Miller
be52bbe3
41413a60
+63
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arch/sparc/include/asm/bitops_64.h
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arch/sparc/include/asm/bitops_64.h
···
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void change_bit(unsigned long nr, volatile unsigned long *addr);
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int fls(unsigned int word);
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int __fls(unsigned long word);
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#include <asm-generic/bitops/non-atomic.h>
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#include <asm-generic/bitops/__fls.h>
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#include <asm-generic/bitops/fls64.h>
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#ifdef __KERNEL__
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arch/sparc/lib/Makefile
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arch/sparc/lib/Makefile
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lib-$(CONFIG_SPARC32) += muldi3.o bitext.o cmpdi2.o
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lib-$(CONFIG_SPARC64) += multi3.o
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lib-$(CONFIG_SPARC64) += fls.o
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lib-$(CONFIG_SPARC64) += fls64.o
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lib-$(CONFIG_SPARC64) += copy_page.o clear_page.o bzero.o
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lib-$(CONFIG_SPARC64) += csum_copy.o csum_copy_from_user.o csum_copy_to_user.o
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arch/sparc/lib/fls64.S
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arch/sparc/lib/fls64.S
···
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/* fls64.S: SPARC default __fls definition.
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*
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* SPARC default __fls definition, which follows the same algorithm as
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* in generic __fls(). This function will be boot time patched on T4
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* and onward.
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*/
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#include <linux/linkage.h>
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#include <asm/export.h>
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.text
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.register %g2, #scratch
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.register %g3, #scratch
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ENTRY(__fls)
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mov -1, %g2
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sllx %g2, 32, %g2
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and %o0, %g2, %g2
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brnz,pt %g2, 1f
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mov 63, %g1
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sllx %o0, 32, %o0
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mov 31, %g1
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1:
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mov -1, %g2
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sllx %g2, 48, %g2
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and %o0, %g2, %g2
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brnz,pt %g2, 2f
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mov -1, %g2
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sllx %o0, 16, %o0
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add %g1, -16, %g1
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2:
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mov -1, %g2
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sllx %g2, 56, %g2
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and %o0, %g2, %g2
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brnz,pt %g2, 3f
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mov -1, %g2
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sllx %o0, 8, %o0
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add %g1, -8, %g1
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3:
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sllx %g2, 60, %g2
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and %o0, %g2, %g2
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brnz,pt %g2, 4f
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mov -1, %g2
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sllx %o0, 4, %o0
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add %g1, -4, %g1
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4:
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sllx %g2, 62, %g2
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and %o0, %g2, %g2
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brnz,pt %g2, 5f
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mov -1, %g3
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sllx %o0, 2, %o0
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add %g1, -2, %g1
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5:
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mov 0, %g2
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sllx %g3, 63, %g3
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and %o0, %g3, %o0
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movre %o0, 1, %g2
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sub %g1, %g2, %g1
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jmp %o7+8
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sra %g1, 0, %o0
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ENDPROC(__fls)
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EXPORT_SYMBOL(__fls)