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61365bd067
Co-authored-by: rafidwayne <117944293+rafidwayne@users.noreply.github.com> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
32 lines
1.5 KiB
C++
32 lines
1.5 KiB
C++
// SpeedBreaker runtime. GPL-3.0-or-later (see COPYING).
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//
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// The guest's 4 GB address space where the operating system needs its own
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// way of making it (kernel/memory.cpp keeps the POSIX one: an anonymous 4 GB
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// mapping with one shared object mapped over the physical windows).
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#pragma once
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#include <cstddef>
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#include <cstdint>
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namespace platform
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{
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#ifdef _WIN32
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// The 4 GB space (at 0x100000000 if it's free) as one placeholder
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// reservation, split at 0xA0000000 and 0xC0000000 into four: [0,
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// 0xA0000000) committed private memory, and the three physical windows
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// 0xA, 0xC and 0xE, each a full 512 MB view of one pagefile-backed
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// section, so they alias. A view must fill its placeholder exactly (the
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// P0 probe: offset 0x1000 or a view 4 KB short both fail), so the 0xE
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// window is unshifted, as on Apple (Memory::eWindowShift 0). Page 0 is
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// left inaccessible (null guest pointers fault). About 3 GB of commit:
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// 2.5 GB private plus the 512 MB section. nullptr when it fails (logged).
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uint8_t* MapGuestSpace();
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// Fresh zero-filled pages for [address, address + size) in the private
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// part (below 0xA0000000): decommitted, then committed again, which also
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// drops any protection. False if the decommit failed (nothing changed;
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// the caller zeroes them by hand). A commit that fails after it (the
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// system at its commit limit) is retried for about 2 s, then aborts.
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bool ResetPrivatePages(void* address, size_t size);
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#endif
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}
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