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Commit be52bbe3 authored by Vijay Kumar's avatar Vijay Kumar Committed by David S. Miller
Browse files

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: default avatarVijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 41413a60

arch/sparc/include/asm/bitops_64.h

+1 −1
Original line number Diff line number Diff line
@@ -23,10 +23,10 @@ void clear_bit(unsigned long nr, volatile unsigned long *addr); 
void change_bit(unsigned long nr, volatile unsigned long *addr);



int fls(unsigned int word);

int __fls(unsigned long word);



#include <asm-generic/bitops/non-atomic.h>



#include <asm-generic/bitops/__fls.h>

#include <asm-generic/bitops/fls64.h>



#ifdef __KERNEL__

arch/sparc/lib/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ lib-$(CONFIG_SPARC32) += lshrdi3.o ashldi3.o 
lib-$(CONFIG_SPARC32) += muldi3.o bitext.o cmpdi2.o

lib-$(CONFIG_SPARC64) += multi3.o

lib-$(CONFIG_SPARC64) += fls.o

lib-$(CONFIG_SPARC64) += fls64.o



lib-$(CONFIG_SPARC64) += copy_page.o clear_page.o bzero.o

lib-$(CONFIG_SPARC64) += csum_copy.o csum_copy_from_user.o csum_copy_to_user.o

arch/sparc/lib/fls64.S

0 → 100644
+61 −0
Original line number Diff line number Diff line 
/* fls64.S: SPARC default __fls definition.

 *

 * SPARC default __fls definition, which follows the same algorithm as

 * in generic __fls(). This function will be boot time patched on T4

 * and onward.

 */



#include <linux/linkage.h>

#include <asm/export.h>



	.text

	.register	%g2, #scratch

	.register	%g3, #scratch

ENTRY(__fls)

	mov	-1, %g2

	sllx	%g2, 32, %g2

	and	%o0, %g2, %g2

	brnz,pt	%g2, 1f

	 mov	63, %g1

	sllx	%o0, 32, %o0

	mov	31, %g1

1:

	mov	-1, %g2

	sllx	%g2, 48, %g2

	and	%o0, %g2, %g2

	brnz,pt	%g2, 2f

	 mov	-1, %g2

	sllx	%o0, 16, %o0

	add	%g1, -16, %g1

2:

	mov	-1, %g2

	sllx	%g2, 56, %g2

	and	%o0, %g2, %g2

	brnz,pt	%g2, 3f

	 mov	-1, %g2

	sllx	%o0, 8, %o0

	add	%g1, -8, %g1

3:

	sllx	%g2, 60, %g2

	and	%o0, %g2, %g2

	brnz,pt	%g2, 4f

	 mov	-1, %g2

	sllx	%o0, 4, %o0

	add	%g1, -4, %g1

4:

	sllx	%g2, 62, %g2

	and	%o0, %g2, %g2

	brnz,pt	%g2, 5f

	 mov	-1, %g3

	sllx	%o0, 2, %o0

	add	%g1, -2, %g1

5:

	mov	0, %g2

	sllx	%g3, 63, %g3

	and	%o0, %g3, %o0

	movre	%o0, 1, %g2

	sub	%g1, %g2, %g1

	jmp	%o7+8

	 sra	%g1, 0, %o0

ENDPROC(__fls)

EXPORT_SYMBOL(__fls)