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arm64/mte: Add support for arm64 mte
For details, please refer to the kernel's introduction to this at "https://docs.kernel.org/arch/arm64/memory-tagging-extension.html" and Android's introduction to this at "https://source.android.com/docs/security/test/memory-safety/arm-mte" Of course, there is also the following detailed principle introduction https://developer.arm.com/-/media/Arm%20Developer%20Community/PDF/Arm_Memory_Tagging_Extension_Whitepaper.pdf The modification of this patch is only to merge the simplest MTE function support. In the future, the MTE function will be integrated into the kernel to a greater extent, for example, hardware MTE Kasan will be supported in the future. Signed-off-by: wangmingrong1 <[email protected]>
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/**************************************************************************** | ||
* arch/arm64/src/common/arm64_mte.c | ||
* | ||
* Licensed to the Apache Software Foundation (ASF) under one or more | ||
* contributor license agreements. See the NOTICE file distributed with | ||
* this work for additional information regarding copyright ownership. The | ||
* ASF licenses this file to you under the Apache License, Version 2.0 (the | ||
* "License"); you may not use this file except in compliance with the | ||
* License. You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
* License for the specific language governing permissions and limitations | ||
* under the License. | ||
* | ||
****************************************************************************/ | ||
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/**************************************************************************** | ||
* Included Files | ||
****************************************************************************/ | ||
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#include <nuttx/config.h> | ||
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#include <assert.h> | ||
#include <stdint.h> | ||
#include <stdio.h> | ||
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#include "arm64_arch.h" | ||
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/**************************************************************************** | ||
* Pre-processor Definitions | ||
****************************************************************************/ | ||
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#define GCR_EL1_VAL 0x10001 | ||
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/**************************************************************************** | ||
* Private Functions | ||
****************************************************************************/ | ||
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static int arm64_mte_is_support(void) | ||
{ | ||
int supported; | ||
__asm__ volatile ( | ||
"mrs %0, ID_AA64PFR1_EL1\n" | ||
"ubfx %0, %0, #8, #3\n" | ||
: "=r" (supported) | ||
: | ||
: "memory" | ||
); | ||
return supported != 0; | ||
} | ||
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/**************************************************************************** | ||
* Public Functions | ||
****************************************************************************/ | ||
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void arm64_enable_mte(void) | ||
{ | ||
uint64_t val; | ||
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if (!arm64_mte_is_support()) | ||
{ | ||
return; | ||
} | ||
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/* CnP must be enabled only after the MAIR_EL1 register has been set | ||
* up. Inconsistent MAIR_EL1 between CPUs sharing the same TLB may | ||
* lead to the wrong memory type being used for a brief window during | ||
* CPU power-up. | ||
* | ||
* CnP is not a boot feature so MTE gets enabled before CnP, but let's | ||
* make sure that is the case. | ||
*/ | ||
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assert(!(read_sysreg(ttbr0_el1) & TTBR_CNP_BIT)); | ||
assert(!(read_sysreg(ttbr1_el1) & TTBR_CNP_BIT)); | ||
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val = read_sysreg(sctlr_el1); | ||
val |= SCTLR_ATA_BIT | SCTLR_TCF1_BIT; | ||
write_sysreg(val, sctlr_el1); | ||
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write_sysreg(GCR_EL1_VAL, gcr_el1); | ||
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/* If GCR_EL1.RRND=1 is implemented the same way as RRND=0, then | ||
* RGSR_EL1.SEED must be non-zero for IRG to produce | ||
* pseudorandom numbers. As RGSR_EL1 is UNKNOWN out of reset, we | ||
* must initialize it. | ||
*/ | ||
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val = (read_sysreg(CNTVCT_EL0) & RGSR_EL1_SEED_MASK) << | ||
RGSR_EL1_SEED_SHIFT; | ||
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if (0 == val) | ||
{ | ||
val = 1 << RGSR_EL1_SEED_SHIFT; | ||
} | ||
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write_sysreg(val, rgsr_el1); | ||
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/* clear any pending tag check faults in TFSR*_EL1 */ | ||
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write_sysreg(0, tfsr_el1); | ||
write_sysreg(0, tfsre0_el1); | ||
} |
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