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aligned memory allocation using VirtualAlloc2

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This commit is contained in:
georgemoralis 2023-08-07 18:16:26 +03:00
parent 3cb89c4b5c
commit c412a5cb0b
3 changed files with 29 additions and 1 deletions
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23
src/Core/virtual_memory.cpp
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@ -19,6 +19,8 @@ enum PosixPageProtection {
};
#endif
#include <debug.h>
#include "../Util/Log.h"
namespace VirtualMemory {
@ -117,4 +119,25 @@ bool memory_patch(u64 vaddr, u64 value) {
return ret;
}
static u64 AlignUp(u64 pos, u64 align) { return (align != 0 ? (pos + (align - 1)) & ~(align - 1) : pos); }
u64 memory_alloc_aligned(u64 address, u64 size, MemoryMode mode, u64 alignment) {
// try allocate aligned address inside user area
MEM_ADDRESS_REQUIREMENTS req{};
MEM_EXTENDED_PARAMETER param{};
req.LowestStartingAddress = (address == 0 ? reinterpret_cast<PVOID>(USER_MIN) : reinterpret_cast<PVOID>(AlignUp(address, alignment)));
req.HighestEndingAddress = reinterpret_cast<PVOID>(USER_MAX);
req.Alignment = alignment;
param.Type = MemExtendedParameterAddressRequirements;
param.Pointer = &req;
auto ptr = reinterpret_cast<uintptr_t>(VirtualAlloc2(
GetCurrentProcess(), nullptr, size, static_cast<DWORD>(MEM_COMMIT) | static_cast<DWORD>(MEM_RESERVE), convertMemoryMode(mode), &param, 1));
if (ptr == 0) {
auto err = static_cast<u32>(GetLastError());
LOG_ERROR_IF(true, "VirtualAlloc2() failed: 0x{:X}\n", err);
}
return ptr;
}
} // namespace VirtualMemory