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https://github.com/patchzyy/wiicompiled
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patchzyy
60 lines
2.9 KiB
C++
60 lines
2.9 KiB
C++
#pragma once
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// Flat 4 GiB guest address space constants used by translated accesses; see guest_flat_memory.h.
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#include <cstddef>
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#include <cstdint>
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namespace GuestFlat {
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// Fixed base so the emitted access is `[reg + imm64-in-register]` with no load
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// of a global.
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inline constexpr uint64_t kGuestSpaceSize = 0x1'0000'0000ull;
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inline constexpr size_t kGuestPageSize = 0x1000;
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#if defined(__x86_64__)
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// 16 TiB: clear of the Windows ASan shadow (32 TiB) and of the usual image/heap
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// placement.
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inline constexpr uintptr_t kFixedFlatGuestBase = 0x0000'1000'0000'0000ull;
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#elif defined(__aarch64__) && defined(__APPLE__)
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// Keep this well above the low address ranges that Darwin's ASLR may use for
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// a PIE executable and its shared cache. Apple Silicon's user VA is wider
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// than Linux's 39-bit minimum, so this 512 GiB region is available while the
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// Linux AArch64 target retains its 64 GiB placement below.
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inline constexpr uintptr_t kFixedFlatGuestBase = 0x0000'0080'0000'0000ull;
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#elif defined(__aarch64__)
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// 16 TiB (this arch's x86_64 sibling value) is unreachable on any AArch64
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// kernel configured for 39-bit virtual addresses (512 GiB ceiling) - common on
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// older/embedded targets (e.g. this project's own tested Jetson/L4T board, kernel
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// 4.9). There mmap() silently ignores a hint above the ceiling and hands back an
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// address near the top of the real range instead, which this module's caller
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// then rejects as "already occupied". 64 GiB is reachable on every AArch64 VA
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// width in real use (39-bit minimum and up) and was confirmed via direct mmap
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// probing to sit far below where the PIE image, heap, shared libraries and
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// stack actually land (all clustered above ~340 GiB on a 39-bit/512 GiB system).
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inline constexpr uintptr_t kFixedFlatGuestBase = 0x0000'0010'0000'0000ull;
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#else
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#error "guest_abi/flat_memory.h has no fixed flat guest base chosen for this architecture"
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#endif
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#define MKW_FLAT_GUEST_BASE (reinterpret_cast<uint8_t*>(GuestFlat::kFixedFlatGuestBase))
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// True when a host VM page covers more than one 4 KiB Wii page. In that
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// configuration, guest-view page protection cannot safely represent per-Wii-
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// page MMIO, deferred-read, or executable-write state, so general translated
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// accesses must use the checked Memory::* path.
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// Windows user mode and x86-64 always use a 4 KiB base page, so those builds
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// fold this to a compile-time false: it appears in every flat access and must
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// not become a hot-path load. Only AArch64, where the page size is a kernel
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// configuration (4/16/64 KiB), has to probe it at runtime.
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#if defined(_WIN32) || defined(__x86_64__)
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#define MKW_GUEST_FLAT_FIXED_PAGE_SIZE 1
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#endif
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#if defined(MKW_GUEST_FLAT_FIXED_PAGE_SIZE)
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inline constexpr bool RequiresCheckedAccess() noexcept { return false; }
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#else
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extern bool g_requiresCheckedAccess;
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inline bool RequiresCheckedAccess() noexcept { return g_requiresCheckedAccess; }
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#endif
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} // namespace GuestFlat
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