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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * Copyright (C) 2012 ARM Ltd.
| */
|
| #include <linux/linkage.h>
| #include <linux/const.h>
| #include <asm/assembler.h>
| #include <asm/page.h>
|
| /*
| * Clear page @dest
| *
| * Parameters:
| * x0 - dest
| */
| SYM_FUNC_START_PI(clear_page)
| mrs x1, dczid_el0
| tbnz x1, #4, 2f /* Branch if DC ZVA is prohibited */
| and w1, w1, #0xf
| mov x2, #4
| lsl x1, x2, x1
|
| 1: dc zva, x0
| add x0, x0, x1
| tst x0, #(PAGE_SIZE - 1)
| b.ne 1b
| ret
|
| 2: stnp xzr, xzr, [x0]
| stnp xzr, xzr, [x0, #16]
| stnp xzr, xzr, [x0, #32]
| stnp xzr, xzr, [x0, #48]
| add x0, x0, #64
| tst x0, #(PAGE_SIZE - 1)
| b.ne 2b
| ret
| SYM_FUNC_END_PI(clear_page)
| EXPORT_SYMBOL(clear_page)
|
|
