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kern: add toggleable support for 40-bit physaddr caps
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3 changed files with 28 additions and 5 deletions
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@ -38,4 +38,13 @@
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/* at the cost of storing class tokens inside the class object. */
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/* However, as of (10/16/2021) KAutoObject has an unused class member */
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/* of the right side, and so this does not actually cost any space. */
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#define MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST
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#define MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST
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/* NOTE: This uses currently-reserved bits inside the MapRange capability */
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/* in order to support large physical addresses (40-bit instead of 36). */
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/* This is toggleable in order to disable it if N ever uses those bits. */
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#if defined(ATMOSPHERE_BOARD_NINTENDO_NX)
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//#define MESOSPHERE_ENABLE_LARGE_PHYSICAL_ADDRESS_CAPABILITIES
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#else
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#define MESOSPHERE_ENABLE_LARGE_PHYSICAL_ADDRESS_CAPABILITIES
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#endif
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@ -82,7 +82,11 @@ namespace ams::kern {
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DEFINE_FIELD(Index, Mask, 3);
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};
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#if defined(MESOSPHERE_ENABLE_LARGE_PHYSICAL_ADDRESS_CAPABILITIES)
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static constexpr u64 PhysicalMapAllowedMask = (1ul << 40) - 1;
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#else
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static constexpr u64 PhysicalMapAllowedMask = (1ul << 36) - 1;
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#endif
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struct MapRange {
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using IdBits = Field<0, CapabilityId<CapabilityType::MapRange> + 1>;
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@ -94,9 +98,15 @@ namespace ams::kern {
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struct MapRangeSize {
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using IdBits = Field<0, CapabilityId<CapabilityType::MapRange> + 1>;
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DEFINE_FIELD(Pages, IdBits, 20);
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DEFINE_FIELD(Pages, IdBits, 20);
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#if defined(MESOSPHERE_ENABLE_LARGE_PHYSICAL_ADDRESS_CAPABILITIES)
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DEFINE_FIELD(AddressHigh, Pages, 4);
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DEFINE_FIELD(Normal, AddressHigh, 1, bool);
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#else
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DEFINE_FIELD(Reserved, Pages, 4);
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DEFINE_FIELD(Normal, Reserved, 1, bool);
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#endif
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};
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struct MapIoPage {
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@ -117,11 +117,15 @@ namespace ams::kern {
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}
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Result KCapabilities::MapRange(const util::BitPack32 cap, const util::BitPack32 size_cap, KProcessPageTable *page_table) {
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/* Get/validate address/size */
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#if defined(MESOSPHERE_ENABLE_LARGE_PHYSICAL_ADDRESS_CAPABILITIES)
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const u64 phys_addr = static_cast<u64>(cap.Get<MapRange::Address>() | (size_cap.Get<MapRangeSize::AddressHigh>() << MapRange::Address::Count)) * PageSize;
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#else
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const u64 phys_addr = static_cast<u64>(cap.Get<MapRange::Address>()) * PageSize;
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/* Validate reserved bits are unused. */
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R_UNLESS(size_cap.Get<MapRangeSize::Reserved>() == 0, svc::ResultOutOfRange());
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/* Get/validate address/size */
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const u64 phys_addr = cap.Get<MapRange::Address>() * PageSize;
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#endif
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const size_t num_pages = size_cap.Get<MapRangeSize::Pages>();
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const size_t size = num_pages * PageSize;
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R_UNLESS(phys_addr == GetInteger(KPhysicalAddress(phys_addr)), svc::ResultInvalidAddress());
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