root/arch/arm64/lib/clear_page.S

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   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 ARM Ltd.
   4  */
   5 
   6 #include <linux/linkage.h>
   7 #include <linux/const.h>
   8 #include <asm/assembler.h>
   9 #include <asm/page.h>
  10 
  11 /*
  12  * Clear page @dest
  13  *
  14  * Parameters:
  15  *      x0 - dest
  16  */
  17 ENTRY(clear_page)
  18         mrs     x1, dczid_el0
  19         and     w1, w1, #0xf
  20         mov     x2, #4
  21         lsl     x1, x2, x1
  22 
  23 1:      dc      zva, x0
  24         add     x0, x0, x1
  25         tst     x0, #(PAGE_SIZE - 1)
  26         b.ne    1b
  27         ret
  28 ENDPROC(clear_page)
  29 EXPORT_SYMBOL(clear_page)
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