mirrors/Atmosphere
1
0
Fork 0
mirror of https://github.com/Atmosphere-NX/Atmosphere.git synced 2025-05-16 08:04:23 -04:00
Code Issues Projects Releases Packages Wiki Activity

kern: implement SvcUnmapMemory, more of SvcGetInfo

Browse source
This commit is contained in:
Michael Scire 2020-05-29 00:57:25 -07:00
parent faad5609b9
commit 1a0696f8a3
14 changed files with 231 additions and 37 deletions
Download patch file Download diff file Expand all files Collapse all files

66
libraries/libmesosphere/source/kern_k_page_table_base.cpp
View file

@ -40,7 +40,7 @@ namespace ams::kern {
this->code_region_start = 0;
this->code_region_end = 0;
this->max_heap_size = 0;
this->max_physical_memory_size = 0;
this->mapped_physical_memory_size = 0;
this->mapped_unsafe_physical_memory = 0;
this->memory_block_slab_manager = std::addressof(Kernel::GetSystemMemoryBlockManager());
@ -225,7 +225,7 @@ namespace ams::kern {
/* Set heap and fill members. */
this->current_heap_end = this->heap_region_start;
this->max_heap_size = 0;
this->max_physical_memory_size = 0;
this->mapped_physical_memory_size = 0;
this->mapped_unsafe_physical_memory = 0;
const bool fill_memory = KTargetSystem::IsDebugMemoryFillEnabled();
@ -452,6 +452,68 @@ namespace ams::kern {
return ResultSuccess();
}
Result KPageTableBase::UnmapMemory(uintptr_t dst_address, uintptr_t src_address, size_t size) {
/* Lock the table. */
KScopedLightLock lk(this->general_lock);
/* Validate that the source address's state is valid. */
KMemoryState src_state;
R_TRY(this->CheckMemoryState(std::addressof(src_state), nullptr, nullptr, src_address, size, KMemoryState_FlagCanAlias, KMemoryState_FlagCanAlias, KMemoryPermission_All, KMemoryPermission_NotMapped | KMemoryPermission_KernelRead, KMemoryAttribute_All, KMemoryAttribute_AnyLocked | KMemoryAttribute_Locked));
/* Validate that the dst address's state is valid. */
KMemoryPermission dst_perm;
R_TRY(this->CheckMemoryState(nullptr, std::addressof(dst_perm), nullptr, dst_address, size, KMemoryState_All, KMemoryState_Stack, KMemoryPermission_None, KMemoryPermission_None, KMemoryAttribute_All, KMemoryAttribute_None));
/* Create an update allocator for the source. */
KMemoryBlockManagerUpdateAllocator src_allocator(this->memory_block_slab_manager);
R_TRY(src_allocator.GetResult());
/* Create an update allocator for the destination. */
KMemoryBlockManagerUpdateAllocator dst_allocator(this->memory_block_slab_manager);
R_TRY(dst_allocator.GetResult());
/* Unmap the memory. */
{
/* Determine the number of pages being operated on. */
const size_t num_pages = size / PageSize;
/* Create page groups for the memory being unmapped. */
KPageGroup pg(this->block_info_manager);
/* Create the page group representing the destination. */
R_TRY(this->MakePageGroup(pg, dst_address, num_pages));
/* Ensure the page group is the valid for the source. */
R_UNLESS(this->IsValidPageGroup(pg, src_address, num_pages), svc::ResultInvalidMemoryRegion());
/* We're going to perform an update, so create a helper. */
KScopedPageTableUpdater updater(this);
/* Unmap the aliased copy of the pages. */
const KPageProperties dst_unmap_properties = { KMemoryPermission_None, false, false, false };
R_TRY(this->Operate(updater.GetPageList(), dst_address, num_pages, Null<KPhysicalAddress>, false, dst_unmap_properties, OperationType_Unmap, false));
/* Ensure that we re-map the aliased pages on failure. */
auto remap_guard = SCOPE_GUARD {
const KPageProperties dst_remap_properties = { dst_perm, false, false, false };
MESOSPHERE_R_ABORT_UNLESS(this->MapPageGroupImpl(updater.GetPageList(), dst_address, pg, dst_remap_properties, true));
};
/* Try to set the permissions for the source pages back to what they should be. */
const KPageProperties src_properties = { KMemoryPermission_UserReadWrite, false, false, false };
R_TRY(this->Operate(updater.GetPageList(), src_address, num_pages, Null<KPhysicalAddress>, false, src_properties, OperationType_ChangePermissions, false));
/* We successfully changed the permissions for the source pages, so we don't need to re-map the dst pages on failure. */
remap_guard.Cancel();
/* Apply the memory block updates. */
this->memory_block_manager.Update(std::addressof(src_allocator), src_address, num_pages, src_state, KMemoryPermission_UserReadWrite, KMemoryAttribute_None);
this->memory_block_manager.Update(std::addressof(dst_allocator), dst_address, num_pages, KMemoryState_None, KMemoryPermission_None, KMemoryAttribute_None);
}
return ResultSuccess();
}
KProcessAddress KPageTableBase::FindFreeArea(KProcessAddress region_start, size_t region_num_pages, size_t num_pages, size_t alignment, size_t offset, size_t guard_pages) const {
KProcessAddress address = Null<KProcessAddress>;