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kern: use slab allocated KSessionRequest dynamic mappings

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Michael Scire 2022-10-12 00:36:32 -07:00 • committed by SciresM
parent e7a1e0fee2
commit 13238fc4fd
4 changed files with 91 additions and 72 deletions
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20
libraries/libmesosphere/source/kern_k_session_request.cpp
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@ -19,22 +19,20 @@ namespace ams::kern {
Result KSessionRequest::SessionMappings::PushMap(KProcessAddress client, KProcessAddress server, size_t size, KMemoryState state, size_t index) {
/* At most 15 buffers of each type (4-bit descriptor counts). */
MESOSPHERE_ASSERT(index < ((1ul << 4) - 1) * 3);
MESOSPHERE_ASSERT(index < NumMappings);
/* Get the mapping. */
Mapping *mapping;
if (index < NumStaticMappings) {
mapping = std::addressof(m_static_mappings[index]);
} else {
/* Allocate a page for the extra mappings. */
if (m_mappings == nullptr) {
KPageBuffer *page_buffer = KPageBuffer::Allocate();
R_UNLESS(page_buffer != nullptr, svc::ResultOutOfMemory());
m_mappings = reinterpret_cast<Mapping *>(page_buffer);
/* Allocate dynamic mappings as necessary. */
if (m_dynamic_mappings == nullptr) {
m_dynamic_mappings = DynamicMappings::Allocate();
R_UNLESS(m_dynamic_mappings != nullptr, svc::ResultOutOfMemory());
}
mapping = std::addressof(m_mappings[index - NumStaticMappings]);
mapping = std::addressof(m_dynamic_mappings->Get(index - NumStaticMappings));
}
/* Set the mapping. */
@ -59,9 +57,9 @@ namespace ams::kern {
}
void KSessionRequest::SessionMappings::Finalize() {
if (m_mappings) {
KPageBuffer::Free(reinterpret_cast<KPageBuffer *>(m_mappings));
m_mappings = nullptr;
if (m_dynamic_mappings) {
DynamicMappings::Free(m_dynamic_mappings);
m_dynamic_mappings = nullptr;
}
}