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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2020 ARM Ltd.
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/page.h>
#include <asm/sysreg.h>
.arch armv8.5-a+memtag
/*
* multitag_transfer_size - set \reg to the block size that is accessed by the
* LDGM/STGM instructions.
*/
.macro multitag_transfer_size, reg, tmp
mrs_s \reg, SYS_GMID_EL1
ubfx \reg, \reg, #SYS_GMID_EL1_BS_SHIFT, #SYS_GMID_EL1_BS_SIZE
mov \tmp, #4
lsl \reg, \tmp, \reg
.endm
/*
* Clear the tags in a page
* x0 - address of the page to be cleared
*/
SYM_FUNC_START(mte_clear_page_tags)
multitag_transfer_size x1, x2
1: stgm xzr, [x0]
add x0, x0, x1
tst x0, #(PAGE_SIZE - 1)
b.ne 1b
ret
SYM_FUNC_END(mte_clear_page_tags)
/*
* Copy the tags from the source page to the destination one
* x0 - address of the destination page
* x1 - address of the source page
*/
SYM_FUNC_START(mte_copy_page_tags)
mov x2, x0
mov x3, x1
multitag_transfer_size x5, x6
1: ldgm x4, [x3]
stgm x4, [x2]
add x2, x2, x5
add x3, x3, x5
tst x2, #(PAGE_SIZE - 1)
b.ne 1b
ret
SYM_FUNC_END(mte_copy_page_tags)
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