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kern: implement MapIo

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This commit is contained in:
Michael Scire 2020-02-19 05:35:22 -08:00
parent 905ce0eeea
commit b99bcbc619
4 changed files with 104 additions and 8 deletions
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76
libraries/libmesosphere/source/kern_k_page_table_base.cpp
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@ -630,7 +630,81 @@ namespace ams::kern {
}
Result KPageTableBase::MapIo(KPhysicalAddress phys_addr, size_t size, KMemoryPermission perm) {
MESOSPHERE_TODO_IMPLEMENT();
MESOSPHERE_ASSERT(util::IsAligned(GetInteger(phys_addr), PageSize));
MESOSPHERE_ASSERT(util::IsAligned(size, PageSize));
MESOSPHERE_ASSERT(size > 0);
R_UNLESS(phys_addr < phys_addr + size, svc::ResultInvalidAddress());
const size_t num_pages = size / PageSize;
const KPhysicalAddress last = phys_addr + size - 1;
/* Get region extents. */
const KProcessAddress region_start = this->GetRegionAddress(KMemoryState_Io);
const size_t region_size = this->GetRegionSize(KMemoryState_Io);
const size_t region_num_pages = region_size / PageSize;
/* Locate the memory region. */
auto region_it = KMemoryLayout::FindContainingRegion(phys_addr);
const auto end_it = KMemoryLayout::GetEnd(phys_addr);
R_UNLESS(region_it != end_it, svc::ResultInvalidAddress());
MESOSPHERE_ASSERT(region_it->Contains(GetInteger(phys_addr)));
/* Ensure that the region is mappable. */
const bool is_rw = perm == KMemoryPermission_UserReadWrite;
do {
/* Check the region attributes. */
R_UNLESS(!region_it->IsDerivedFrom(KMemoryRegionType_Dram), svc::ResultInvalidAddress());
R_UNLESS(!region_it->HasTypeAttribute(KMemoryRegionAttr_UserReadOnly) || !is_rw, svc::ResultInvalidAddress());
R_UNLESS(!region_it->HasTypeAttribute(KMemoryRegionAttr_NoUserMap), svc::ResultInvalidAddress());
/* Check if we're done. */
if (GetInteger(last) <= region_it->GetLastAddress()) {
break;
}
/* Advance. */
region_it++;
} while (region_it != end_it);
/* Lock the table. */
KScopedLightLock lk(this->general_lock);
/* Select an address to map at. */
KProcessAddress addr = Null<KProcessAddress>;
const size_t phys_alignment = std::min(std::min(GetInteger(phys_addr) & -GetInteger(phys_addr), size & -size), MaxPhysicalMapAlignment);
for (s32 block_type = KPageTable::GetMaxBlockType(); block_type >= 0; block_type--) {
const size_t alignment = KPageTable::GetBlockSize(static_cast<KPageTable::BlockType>(block_type));
if (alignment > phys_alignment) {
continue;
}
addr = this->FindFreeArea(region_start, region_num_pages, num_pages, alignment, 0, this->GetNumGuardPages());
if (addr != Null<KProcessAddress>) {
break;
}
}
R_UNLESS(addr != Null<KProcessAddress>, svc::ResultOutOfMemory());
/* Check that we can map IO here. */
MESOSPHERE_ASSERT(this->CanContain(addr, size, KMemoryState_Io));
MESOSPHERE_R_ASSERT(this->CheckMemoryState(addr, size, KMemoryState_All, KMemoryState_Free, KMemoryPermission_None, KMemoryPermission_None, KMemoryAttribute_None, KMemoryAttribute_None));
/* Create an update allocator. */
KMemoryBlockManagerUpdateAllocator allocator(this->memory_block_slab_manager);
R_TRY(allocator.GetResult());
/* We're going to perform an update, so create a helper. */
KScopedPageTableUpdater updater(this);
/* Perform mapping operation. */
const KPageProperties properties = { perm, true, false, false };
R_TRY(this->Operate(updater.GetPageList(), addr, num_pages, phys_addr, true, properties, OperationType_Map, false));
/* Update the blocks. */
this->memory_block_manager.Update(&allocator, addr, num_pages, KMemoryState_Io, perm, KMemoryAttribute_None);
/* We successfully mapped the pages. */
return ResultSuccess();
}
Result KPageTableBase::MapStatic(KPhysicalAddress phys_addr, size_t size, KMemoryPermission perm) {