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Commit e37925eb authored by Hans-Christian Egtvedt's avatar Hans-Christian Egtvedt Committed by Haavard Skinnemoen
Browse files

avr32: add generic_find_next_le_bit bit function 



This patch implements the generic_find_next_le_bit bit function for AVR32
architecture. This is used by EXT4 file system.

Signed-off-by: default avatarHans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Signed-off-by: default avatarHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
parent 1b771c12

arch/avr32/kernel/avr32_ksyms.c

+1 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ EXPORT_SYMBOL(find_first_zero_bit); 
EXPORT_SYMBOL(find_next_zero_bit);

EXPORT_SYMBOL(find_first_bit);

EXPORT_SYMBOL(find_next_bit);

EXPORT_SYMBOL(generic_find_next_le_bit);

EXPORT_SYMBOL(generic_find_next_zero_le_bit);



/* I/O primitives (lib/io-*.S) */

arch/avr32/lib/findbit.S

+30 −0
Original line number Diff line number Diff line
@@ -123,6 +123,36 @@ ENTRY(find_next_bit) 
	brgt	1b

	retal	r11



ENTRY(generic_find_next_le_bit)

	lsr	r8, r10, 5

	sub	r9, r11, r10

	retle	r11



	lsl	r8, 2

	add	r12, r8

	andl	r10, 31, COH

	breq	1f



	/* offset is not word-aligned. Handle the first (32 - r10) bits */

	ldswp.w	r8, r12[0]

	sub	r12, -4

	lsr	r8, r8, r10

	brne	.L_found



	/* r9 = r9 - (32 - r10) = r9 + r10 - 32 */

	add	r9, r10

	sub	r9, 32

	retle	r11



	/* Main loop. offset must be word-aligned */

1:	ldswp.w	r8, r12[0]

	cp.w	r8, 0

	brne	.L_found

	sub	r12, -4

	sub	r9, 32

	brgt	1b

	retal	r11



ENTRY(generic_find_next_zero_le_bit)

	lsr	r8, r10, 5

	sub	r9, r11, r10