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kernel/linux-imx6_3.14.28/arch/avr32/lib/findbit.S 3.15 KB
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  /*
   * Copyright (C) 2006 Atmel Corporation
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  #include <linux/linkage.h>
  
  	.text
  	/*
  	 * unsigned long find_first_zero_bit(const unsigned long *addr,
  	 *				     unsigned long size)
  	 */
  ENTRY(find_first_zero_bit)
  	cp.w	r11, 0
  	reteq	r11
  	mov	r9, r11
  1:	ld.w	r8, r12[0]
  	com	r8
  	brne	.L_found
  	sub	r12, -4
  	sub	r9, 32
  	brgt	1b
  	retal	r11
  
  	/*
  	 * unsigned long find_next_zero_bit(const unsigned long *addr,
  	 *				    unsigned long size,
  	 *				    unsigned long offset)
  	 */
  ENTRY(find_next_zero_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 */
  	ld.w	r8, r12[0]
  	com	r8
  	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:	ld.w	r8, r12[0]
  	com	r8
  	brne	.L_found
  	sub	r12, -4
  	sub	r9, 32
  	brgt	1b
  	retal	r11
  
  	/* Common return path for when a bit is actually found. */
  .L_found:
  	brev	r8
  	clz	r10, r8
  	rsub	r9, r11
  	add	r10, r9
  
  	/* XXX: If we don't have to return exactly "size" when the bit
  	   is not found, we may drop this "min" thing */
  	min	r12, r11, r10
  	retal	r12
  
  	/*
  	 * unsigned long find_first_bit(const unsigned long *addr,
  	 *				unsigned long size)
  	 */
  ENTRY(find_first_bit)
  	cp.w	r11, 0
  	reteq	r11
  	mov	r9, r11
  1:	ld.w	r8, r12[0]
  	cp.w	r8, 0
  	brne	.L_found
  	sub	r12, -4
  	sub	r9, 32
  	brgt	1b
  	retal	r11
  
  	/*
  	 * unsigned long find_next_bit(const unsigned long *addr,
  	 *			       unsigned long size,
  	 *			       unsigned long offset)
  	 */
  ENTRY(find_next_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 */
  	ld.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:	ld.w	r8, r12[0]
  	cp.w	r8, 0
  	brne	.L_found
  	sub	r12, -4
  	sub	r9, 32
  	brgt	1b
  	retal	r11
  
  ENTRY(find_next_bit_le)
  	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(find_next_zero_bit_le)
  	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
  	com	r8
  	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]
  	com	r8
  	brne	.L_found
  	sub	r12, -4
  	sub	r9, 32
  	brgt	1b
  	retal	r11