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Kernel/riscv64: Implement RISC-V SmapDisabler

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Sönke Holz 2023-10-22 11:17:53 +02:00 • committed by Andrew Kaster
parent cb1b0c4101
commit b6ac2ed34d
1 changed files with 23 additions and 0 deletions
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23
Kernel/Arch/riscv64/SmapDisabler.cpp Normal file
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/*
* Copyright (c) 2023, Sönke Holz <sholz8530@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Arch/SmapDisabler.h>
#include <Kernel/Arch/riscv64/CSR.h>
namespace Kernel {
SmapDisabler::SmapDisabler()
: m_flags(RISCV64::CSR::read_and_set_bits(RISCV64::CSR::Address::SSTATUS, 1 << to_underlying(RISCV64::CSR::SSTATUS::Offset::SUM)))
{
}
SmapDisabler::~SmapDisabler()
{
if ((m_flags & (1 << to_underlying(RISCV64::CSR::SSTATUS::Offset::SUM))) == 0)
RISCV64::CSR::clear_bits(RISCV64::CSR::Address::SSTATUS, 1 << to_underlying(RISCV64::CSR::SSTATUS::Offset::SUM));
}
}