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kern: add toggleable support for 40-bit physaddr caps

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This commit is contained in:
Michael Scire 2021-10-22 09:33:53 -07:00
parent ff1760fac1
commit d562bb841d
3 changed files with 28 additions and 5 deletions
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11
libraries/libmesosphere/include/mesosphere/kern_build_config.hpp
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@ -38,4 +38,13 @@
/* at the cost of storing class tokens inside the class object. */
/* However, as of (10/16/2021) KAutoObject has an unused class member */
/* of the right side, and so this does not actually cost any space. */
#define MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST
#define MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST
/* NOTE: This uses currently-reserved bits inside the MapRange capability */
/* in order to support large physical addresses (40-bit instead of 36). */
/* This is toggleable in order to disable it if N ever uses those bits. */
#if defined(ATMOSPHERE_BOARD_NINTENDO_NX)
//#define MESOSPHERE_ENABLE_LARGE_PHYSICAL_ADDRESS_CAPABILITIES
#else
#define MESOSPHERE_ENABLE_LARGE_PHYSICAL_ADDRESS_CAPABILITIES
#endif

12
libraries/libmesosphere/include/mesosphere/kern_k_capabilities.hpp
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@ -82,7 +82,11 @@ namespace ams::kern {
DEFINE_FIELD(Index, Mask, 3);
};
#if defined(MESOSPHERE_ENABLE_LARGE_PHYSICAL_ADDRESS_CAPABILITIES)
static constexpr u64 PhysicalMapAllowedMask = (1ul << 40) - 1;
#else
static constexpr u64 PhysicalMapAllowedMask = (1ul << 36) - 1;
#endif
struct MapRange {
using IdBits = Field<0, CapabilityId<CapabilityType::MapRange> + 1>;
@ -94,9 +98,15 @@ namespace ams::kern {
struct MapRangeSize {
using IdBits = Field<0, CapabilityId<CapabilityType::MapRange> + 1>;
DEFINE_FIELD(Pages, IdBits, 20);
DEFINE_FIELD(Pages, IdBits, 20);
#if defined(MESOSPHERE_ENABLE_LARGE_PHYSICAL_ADDRESS_CAPABILITIES)
DEFINE_FIELD(AddressHigh, Pages, 4);
DEFINE_FIELD(Normal, AddressHigh, 1, bool);
#else
DEFINE_FIELD(Reserved, Pages, 4);
DEFINE_FIELD(Normal, Reserved, 1, bool);
#endif
};
struct MapIoPage {

10
libraries/libmesosphere/source/kern_k_capabilities.cpp
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@ -117,11 +117,15 @@ namespace ams::kern {
}
Result KCapabilities::MapRange(const util::BitPack32 cap, const util::BitPack32 size_cap, KProcessPageTable *page_table) {
/* Get/validate address/size */
#if defined(MESOSPHERE_ENABLE_LARGE_PHYSICAL_ADDRESS_CAPABILITIES)
const u64 phys_addr = static_cast<u64>(cap.Get<MapRange::Address>() | (size_cap.Get<MapRangeSize::AddressHigh>() << MapRange::Address::Count)) * PageSize;
#else
const u64 phys_addr = static_cast<u64>(cap.Get<MapRange::Address>()) * PageSize;
/* Validate reserved bits are unused. */
R_UNLESS(size_cap.Get<MapRangeSize::Reserved>() == 0, svc::ResultOutOfRange());
/* Get/validate address/size */
const u64 phys_addr = cap.Get<MapRange::Address>() * PageSize;
#endif
const size_t num_pages = size_cap.Get<MapRangeSize::Pages>();
const size_t size = num_pages * PageSize;
R_UNLESS(phys_addr == GetInteger(KPhysicalAddress(phys_addr)), svc::ResultInvalidAddress());