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Atmosphere/libraries/libmesosphere/source/kern_k_thread_local_page.cpp

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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/>.
*/
#include <mesosphere.hpp>
namespace ams::kern {
Result KThreadLocalPage::Initialize(KProcess *process) {
MESOSPHERE_ASSERT_THIS();
/* Set that this process owns us. */
m_owner = process;
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/* Allocate a new page. */
KPageBuffer *page_buf = KPageBuffer::Allocate();
R_UNLESS(page_buf != nullptr, svc::ResultOutOfMemory());
ON_RESULT_FAILURE { KPageBuffer::Free(page_buf); };
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/* Map the address in. */
R_RETURN(m_owner->GetPageTable().MapPages(std::addressof(m_virt_addr), 1, PageSize, page_buf->GetPhysicalAddress(), KMemoryState_ThreadLocal, KMemoryPermission_UserReadWrite));
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}
Result KThreadLocalPage::Finalize() {
MESOSPHERE_ASSERT_THIS();
/* Get the physical address of the page. */
KPhysicalAddress phys_addr = Null<KPhysicalAddress>;
MESOSPHERE_ABORT_UNLESS(m_owner->GetPageTable().GetPhysicalAddress(std::addressof(phys_addr), this->GetAddress()));
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/* Unmap the page. */
R_TRY(m_owner->GetPageTable().UnmapPages(this->GetAddress(), 1, KMemoryState_ThreadLocal));
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/* Free the page. */
KPageBuffer::Free(KPageBuffer::FromPhysicalAddress(phys_addr));
R_SUCCEED();
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}
KProcessAddress KThreadLocalPage::Reserve() {
MESOSPHERE_ASSERT_THIS();
for (size_t i = 0; i < util::size(m_is_region_free); i++) {
if (m_is_region_free[i]) {
m_is_region_free[i] = false;
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return this->GetRegionAddress(i);
}
}
return Null<KProcessAddress>;
}
void KThreadLocalPage::Release(KProcessAddress addr) {
MESOSPHERE_ASSERT_THIS();
m_is_region_free[this->GetRegionIndex(addr)] = true;
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}
void *KThreadLocalPage::GetPointer() const {
MESOSPHERE_ASSERT_THIS();
KPhysicalAddress phys_addr;
MESOSPHERE_ABORT_UNLESS(m_owner->GetPageTable().GetPhysicalAddress(std::addressof(phys_addr), this->GetAddress()));
return static_cast<void *>(KPageBuffer::FromPhysicalAddress(phys_addr));
}
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}