Eric Lee / smarc-fsl-linux-kernel

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arch/arm64/lib/bitops.S 1.92 KB
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81f7e3824   Eric Lee   Initial Release, ... 
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  /*
   * Based on arch/arm/lib/bitops.h
   *
   * Copyright (C) 2013 ARM Ltd.
   *
   * 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.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #include <linux/linkage.h>
  #include <asm/assembler.h>
  #include <asm/lse.h>
  
  /*
   * x0: bits 5:0  bit offset
   *     bits 31:6 word offset
   * x1: address
   */
  	.macro	bitop, name, llsc, lse
  ENTRY(	
  ame	)
  	and	w3, w0, #63		// Get bit offset
  	eor	w0, w0, w3		// Clear low bits
  	mov	x2, #1
  	add	x1, x1, x0, lsr #3	// Get word offset
  alt_lse "	prfm	pstl1strm, [x1]",	"nop"
  	lsl	x3, x2, x3		// Create mask
  
  alt_lse	"1:	ldxr	x2, [x1]",		"\lse	x3, [x1]"
  alt_lse	"	\llsc	x2, x2, x3",		"nop"
  alt_lse	"	stxr	w0, x2, [x1]",		"nop"
  alt_lse	"	cbnz	w0, 1b",		"nop"
  
  	ret
  ENDPROC(
  ame	)
  	.endm
  
  	.macro	testop, name, llsc, lse
  ENTRY(	
  ame	)
  	and	w3, w0, #63		// Get bit offset
  	eor	w0, w0, w3		// Clear low bits
  	mov	x2, #1
  	add	x1, x1, x0, lsr #3	// Get word offset
  alt_lse "	prfm	pstl1strm, [x1]",	"nop"
  	lsl	x4, x2, x3		// Create mask
  
  alt_lse	"1:	ldxr	x2, [x1]",		"\lse	x4, x2, [x1]"
  	lsr	x0, x2, x3
  alt_lse	"	\llsc	x2, x2, x4",		"nop"
  alt_lse	"	stlxr	w5, x2, [x1]",		"nop"
  alt_lse	"	cbnz	w5, 1b",		"nop"
  alt_lse	"	dmb	ish",			"nop"
  
  	and	x0, x0, #1
  	ret
  ENDPROC(
  ame	)
  	.endm
  
  /*
   * Atomic bit operations.
   */
  	bitop	change_bit, eor, steor
  	bitop	clear_bit, bic, stclr
  	bitop	set_bit, orr, stset
  
  	testop	test_and_change_bit, eor, ldeoral
  	testop	test_and_clear_bit, bic, ldclral
  	testop	test_and_set_bit, orr, ldsetal