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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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16
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_page_table.hpp
View file

@ -28,11 +28,7 @@ namespace ams::kern::arch::arm64 {
public:
using TraversalEntry = KPageTableImpl::TraversalEntry;
using TraversalContext = KPageTableImpl::TraversalContext;
private:
KPageTableManager *manager;
u64 ttbr;
u8 asid;
private:
enum BlockType {
BlockType_L3Block,
BlockType_L3ContiguousBlock,
@ -64,6 +60,10 @@ namespace ams::kern::arch::arm64 {
[BlockType_L1Block] = L1BlockSize,
};
static constexpr BlockType GetMaxBlockType() {
return BlockType_L1Block;
}
static constexpr size_t GetBlockSize(BlockType type) {
return BlockSizes[type];
}
@ -91,6 +91,10 @@ namespace ams::kern::arch::arm64 {
MESOSPHERE_ASSERT(alignment < L1BlockSize);
return KPageTable::GetBlockSize(static_cast<KPageTable::BlockType>(KPageTable::GetBlockType(alignment) + 1));
}
private:
KPageTableManager *manager;
u64 ttbr;
u8 asid;
protected:
virtual Result Operate(PageLinkedList *page_list, KProcessAddress virt_addr, size_t num_pages, KPhysicalAddress phys_addr, bool is_pa_valid, const KPageProperties properties, OperationType operation, bool reuse_ll) override;
virtual Result Operate(PageLinkedList *page_list, KProcessAddress virt_addr, size_t num_pages, const KPageGroup *page_group, const KPageProperties properties, OperationType operation, bool reuse_ll) override;
@ -111,7 +115,7 @@ namespace ams::kern::arch::arm64 {
/* Set page attribute. */
if (properties.io) {
MESOSPHERE_ABORT_UNLESS(!properties.io);
MESOSPHERE_ABORT_UNLESS(!properties.uncached);
MESOSPHERE_ABORT_UNLESS((properties.perm & (KMemoryPermission_KernelExecute | KMemoryPermission_UserExecute)) == 0);
entry.SetPageAttribute(PageTableEntry::PageAttribute_Device_nGnRnE)

16
libraries/libmesosphere/include/mesosphere/kern_k_memory_layout.hpp
View file

@ -424,6 +424,22 @@ namespace ams::kern {
static ALWAYS_INLINE KMemoryRegionTree &GetVirtualLinearMemoryRegionTree() { return s_virtual_linear_tree; }
static ALWAYS_INLINE KMemoryRegionTree &GetPhysicalLinearMemoryRegionTree() { return s_physical_linear_tree; }
static ALWAYS_INLINE KMemoryRegionTree::iterator GetEnd(KVirtualAddress) {
return GetVirtualLinearMemoryRegionTree().end();
}
static ALWAYS_INLINE KMemoryRegionTree::iterator GetEnd(KPhysicalAddress) {
return GetPhysicalMemoryRegionTree().end();
}
static NOINLINE KMemoryRegionTree::iterator FindContainingRegion(KVirtualAddress address) {
return GetVirtualMemoryRegionTree().FindContainingRegion(GetInteger(address));
}
static NOINLINE KMemoryRegionTree::iterator FindContainingRegion(KPhysicalAddress address) {
return GetPhysicalMemoryRegionTree().FindContainingRegion(GetInteger(address));
}
static ALWAYS_INLINE KVirtualAddress GetLinearVirtualAddress(KPhysicalAddress address) {
return GetInteger(address) + s_linear_phys_to_virt_diff;
}

4
libraries/libmesosphere/include/mesosphere/kern_k_page_table_base.hpp
View file

@ -53,7 +53,9 @@ namespace ams::kern {
/* TODO: perm/attr operations */
};
static constexpr size_t RegionAlignment = KernelAslrAlignment;
static constexpr size_t MaxPhysicalMapAlignment = 1_GB;
static constexpr size_t RegionAlignment = 2_MB;
static_assert(RegionAlignment == KernelAslrAlignment);
struct PageLinkedList {
private:

76
libraries/libmesosphere/source/kern_k_page_table_base.cpp
View file

@ -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) {