Atmosphere/libraries/libmesosphere/include/mesosphere/kern_k_page_buffer.hpp

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/*
* Copyright (c) Atmosphère-NX
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*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <mesosphere/kern_slab_helpers.hpp>
#include <mesosphere/kern_k_memory_layout.hpp>
namespace ams::kern {
class KPageBuffer : public KSlabAllocated<KPageBuffer> {
private:
alignas(PageSize) u8 m_buffer[PageSize];
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public:
KPageBuffer() {
std::memset(m_buffer, 0, sizeof(m_buffer));
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}
ALWAYS_INLINE KPhysicalAddress GetPhysicalAddress() const {
return KMemoryLayout::GetLinearPhysicalAddress(KVirtualAddress(this));
}
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static ALWAYS_INLINE KPageBuffer *FromPhysicalAddress(KPhysicalAddress phys_addr) {
const KVirtualAddress virt_addr = KMemoryLayout::GetLinearVirtualAddress(phys_addr);
MESOSPHERE_ASSERT(util::IsAligned(GetInteger(phys_addr), PageSize));
MESOSPHERE_ASSERT(util::IsAligned(GetInteger(virt_addr), PageSize));
return GetPointer<KPageBuffer>(virt_addr);
}
};
static_assert(sizeof(KPageBuffer) == PageSize);
static_assert(alignof(KPageBuffer) == PageSize);
}