projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 34bfeea4 CM |
1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* | |
| 3 | * Copyright (C) 2020 ARM Ltd. | |
| 4 | */ | |
| 5 | #include <linux/linkage.h> | |
| 6 | ||
| 7 | #include <asm/assembler.h> | |
| 8 | #include <asm/sysreg.h> | |
| 9 | ||
| 10 | .arch armv8.5-a+memtag | |
| 11 | ||
| 12 | /* | |
| 13 | * multitag_transfer_size - set \reg to the block size that is accessed by the | |
| 14 | * LDGM/STGM instructions. | |
| 15 | */ | |
| 16 | .macro multitag_transfer_size, reg, tmp | |
| 17 | mrs_s \reg, SYS_GMID_EL1 | |
| 18 | ubfx \reg, \reg, #SYS_GMID_EL1_BS_SHIFT, #SYS_GMID_EL1_BS_SIZE | |
| 19 | mov \tmp, #4 | |
| 20 | lsl \reg, \tmp, \reg | |
| 21 | .endm | |
| 22 | ||
| 23 | /* | |
| 24 | * Clear the tags in a page | |
| 25 | * x0 - address of the page to be cleared | |
| 26 | */ | |
| 27 | SYM_FUNC_START(mte_clear_page_tags) | |
| 28 | multitag_transfer_size x1, x2 | |
| 29 | 1: stgm xzr, [x0] | |
| 30 | add x0, x0, x1 | |
| 31 | tst x0, #(PAGE_SIZE - 1) | |
| 32 | b.ne 1b | |
| 33 | ret | |
| 34 | SYM_FUNC_END(mte_clear_page_tags) |