diff --git a/ctypes_generation/definitions/structures/system_info.txt b/ctypes_generation/definitions/structures/system_info.txt
new file mode 100644
index 0000000..4a27618
--- /dev/null
+++ b/ctypes_generation/definitions/structures/system_info.txt
@@ -0,0 +1,71 @@
+/* Based on
+winternl.h
+&
+https://www.geoffchappell.com/studies/windows/km/ntoskrnl/api/ex/sysinfo/process.htm
+*/
+
+typedef struct _SYSTEM_PROCESS_INFORMATION {
+    ULONG NextEntryOffset;
+    ULONG NumberOfThreads;
+    BYTE Reserved1[24];
+    LARGE_INTEGER CreateTime;
+    LARGE_INTEGER UserTime;
+    LARGE_INTEGER KernelTime;
+    UNICODE_STRING ImageName;
+    LONG BasePriority;
+    HANDLE UniqueProcessId;
+    PVOID InheritedFromUniqueProcessId;
+    ULONG HandleCount;
+    BYTE Reserved4[4];
+    PVOID Reserved5[1];
+    PVOID PeakVirtualSize;
+    PVOID VirtualSize;
+    PVOID PageFaultCount;
+    PVOID PeakWorkingSetSize;
+    PVOID WorkingSetSize;
+    PVOID QuotaPeakPagedPoolUsage;
+    PVOID QuotaPagedPoolUsage;
+    PVOID QuotaPeakNonPagedPoolUsage;
+    PVOID QuotaNonPagedPoolUsage;
+    PVOID PagefileUsage;
+    SIZE_T PeakPagefileUsage;
+    SIZE_T PrivatePageCount;
+    LARGE_INTEGER Reserved6[6];
+} SYSTEM_PROCESS_INFORMATION, *PSYSTEM_PROCESS_INFORMATION;
+
+
+typedef struct _SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION {
+    LARGE_INTEGER IdleTime;
+    LARGE_INTEGER KernelTime;
+    LARGE_INTEGER UserTime;
+    LARGE_INTEGER Reserved1[2];
+    ULONG Reserved2;
+} SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION, *PSYSTEM_PROCESSOR_PERFORMANCE_INFORMATION;
+
+
+typedef struct _SYSTEM_REGISTRY_QUOTA_INFORMATION {
+    ULONG RegistryQuotaAllowed;
+    ULONG RegistryQuotaUsed;
+    PVOID Reserved1;
+} SYSTEM_REGISTRY_QUOTA_INFORMATION, *PSYSTEM_REGISTRY_QUOTA_INFORMATION;
+
+typedef struct _SYSTEM_BASIC_INFORMATION {
+    BYTE Reserved1[24];
+    PVOID Reserved2[4];
+    CHAR NumberOfProcessors;
+} SYSTEM_BASIC_INFORMATION, *PSYSTEM_BASIC_INFORMATION;
+
+
+typedef struct _SYSTEM_PROCESS_INFORMATION_ORIG {
+    ULONG NextEntryOffset;
+    BYTE Reserved1[52];
+    PVOID Reserved2[3];
+    HANDLE UniqueProcessId;
+    PVOID Reserved3;
+    ULONG HandleCount;
+    BYTE Reserved4[4];
+    PVOID Reserved5[11];
+    SIZE_T PeakPagefileUsage;
+    SIZE_T PrivatePageCount;
+    LARGE_INTEGER Reserved6[6];
+} SYSTEM_PROCESS_INFORMATION_ORIG, *PSYSTEM_PROCESS_INFORMATION_ORIG;
\ No newline at end of file
diff --git a/tests/test_generated_def.py b/tests/test_generated_def.py
index c059c62..b38a6d4 100644
--- a/tests/test_generated_def.py
+++ b/tests/test_generated_def.py
@@ -12,9 +12,13 @@ def assert_struct_offset(struct, field, offset):
 if windows.current_process.bitness == 32:
     PEB32 = windows.generated_def.PEB
     PEB64 = rctypes.transform_type_to_remote64bits(windows.generated_def.PEB)
+    SYSTEM_PROCESS_INFORMATION32 = windows.generated_def.SYSTEM_PROCESS_INFORMATION
+    SYSTEM_PROCESS_INFORMATION64 = rctypes.transform_type_to_remote64bits(windows.generated_def.SYSTEM_PROCESS_INFORMATION)
 else:
     PEB32 = rctypes.transform_type_to_remote32bits(windows.generated_def.PEB)
     PEB64 = windows.generated_def.PEB
+    SYSTEM_PROCESS_INFORMATION32 = rctypes.transform_type_to_remote32bits(windows.generated_def.SYSTEM_PROCESS_INFORMATION)
+    SYSTEM_PROCESS_INFORMATION64 = windows.generated_def.SYSTEM_PROCESS_INFORMATION
 
 def test_peb32_fields():
     assert_peb_offset = lambda field, offset: assert_struct_offset(PEB32, field, offset)
@@ -49,6 +53,50 @@ def test_peb64_fields():
     assert_peb_offset("CSDVersion", 0x02E8)
     assert_peb_offset("MinimumStackCommit", 0x0318)
 
+def test_system_process_information32_fields():
+    assert_spi_offset = lambda field, offset: assert_struct_offset(SYSTEM_PROCESS_INFORMATION32, field, offset)
+    # Mainly based on https://www.geoffchappell.com/studies/windows/km/ntoskrnl/api/ex/sysinfo/process.htm
+    # And some symbol files :)
+    assert_spi_offset("NextEntryOffset", 0)
+    assert_spi_offset('NumberOfThreads', 4)
+    assert_spi_offset('CreateTime', 0x20)
+    assert_spi_offset('UserTime', 0x28)
+    assert_spi_offset('KernelTime', 0x30)
+    assert_spi_offset('ImageName', 0x38)
+    assert_spi_offset('BasePriority', 0x40)
+    assert_spi_offset('UniqueProcessId', 0x44)
+    assert_spi_offset('InheritedFromUniqueProcessId', 0x48)
+    assert_spi_offset('PeakVirtualSize', 0x58)
+    assert_spi_offset('VirtualSize', 0x5C)
+    assert_spi_offset('PageFaultCount', 0x60)
+    assert_spi_offset('PeakWorkingSetSize', 0x64)
+    assert_spi_offset('WorkingSetSize', 0x68)
+    assert_spi_offset('PagefileUsage', 0x7C)
+    assert_spi_offset('PeakPagefileUsage', 0x80)
+
+
+def test_system_process_information64_fields():
+    assert_spi_offset = lambda field, offset: assert_struct_offset(SYSTEM_PROCESS_INFORMATION64, field, offset)
+    # Mainly based on https://www.geoffchappell.com/studies/windows/km/ntoskrnl/api/ex/sysinfo/process.htm
+    # And some symbol files :)
+    assert_spi_offset("NextEntryOffset", 0)
+    assert_spi_offset('NumberOfThreads', 4)
+    assert_spi_offset('CreateTime', 0x20)
+    assert_spi_offset('UserTime', 0x28)
+    assert_spi_offset('KernelTime', 0x30)
+    assert_spi_offset('ImageName', 0x38)
+    assert_spi_offset('BasePriority', 0x48)
+    assert_spi_offset('UniqueProcessId', 0x50)
+    assert_spi_offset('InheritedFromUniqueProcessId', 0x58)
+    assert_spi_offset('PeakVirtualSize', 0x70)
+    assert_spi_offset('VirtualSize', 0x78)
+    assert_spi_offset('PageFaultCount', 0x80)
+    assert_spi_offset('PeakWorkingSetSize', 0x88)
+    assert_spi_offset('WorkingSetSize', 0x90)
+    assert_spi_offset('PagefileUsage', 0xB8)
+    assert_spi_offset('PeakPagefileUsage', 0xC0)
+
+
 def test_cs_custom_define():
     assert windows.generated_def.CS_USER_32B == 0x23
     assert windows.generated_def.CS_USER_64B == 0x33
diff --git a/windows/generated_def/winstructs.py b/windows/generated_def/winstructs.py
index e5682cd..18f28aa 100644
--- a/windows/generated_def/winstructs.py
+++ b/windows/generated_def/winstructs.py
@@ -9331,6 +9331,84 @@ PEXPLICIT_ACCESSW = POINTER(_EXPLICIT_ACCESS_W)
 PEXPLICIT_ACCESS_W = POINTER(_EXPLICIT_ACCESS_W)
 EXPLICIT_ACCESS_W = _EXPLICIT_ACCESS_W
 
+class _SYSTEM_PROCESS_INFORMATION(Structure):
+    _fields_ = [
+        ("NextEntryOffset", ULONG),
+        ("NumberOfThreads", ULONG),
+        ("Reserved1", BYTE * (24)),
+        ("CreateTime", LARGE_INTEGER),
+        ("UserTime", LARGE_INTEGER),
+        ("KernelTime", LARGE_INTEGER),
+        ("ImageName", UNICODE_STRING),
+        ("BasePriority", LONG),
+        ("UniqueProcessId", HANDLE),
+        ("InheritedFromUniqueProcessId", PVOID),
+        ("HandleCount", ULONG),
+        ("Reserved4", BYTE * (4)),
+        ("Reserved5", PVOID * (1)),
+        ("PeakVirtualSize", PVOID),
+        ("VirtualSize", PVOID),
+        ("PageFaultCount", PVOID),
+        ("PeakWorkingSetSize", PVOID),
+        ("WorkingSetSize", PVOID),
+        ("QuotaPeakPagedPoolUsage", PVOID),
+        ("QuotaPagedPoolUsage", PVOID),
+        ("QuotaPeakNonPagedPoolUsage", PVOID),
+        ("QuotaNonPagedPoolUsage", PVOID),
+        ("PagefileUsage", PVOID),
+        ("PeakPagefileUsage", SIZE_T),
+        ("PrivatePageCount", SIZE_T),
+        ("Reserved6", LARGE_INTEGER * (6)),
+    ]
+SYSTEM_PROCESS_INFORMATION = _SYSTEM_PROCESS_INFORMATION
+PSYSTEM_PROCESS_INFORMATION = POINTER(_SYSTEM_PROCESS_INFORMATION)
+
+class _SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION(Structure):
+    _fields_ = [
+        ("IdleTime", LARGE_INTEGER),
+        ("KernelTime", LARGE_INTEGER),
+        ("UserTime", LARGE_INTEGER),
+        ("Reserved1", LARGE_INTEGER * (2)),
+        ("Reserved2", ULONG),
+    ]
+SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION = _SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION
+PSYSTEM_PROCESSOR_PERFORMANCE_INFORMATION = POINTER(_SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION)
+
+class _SYSTEM_REGISTRY_QUOTA_INFORMATION(Structure):
+    _fields_ = [
+        ("RegistryQuotaAllowed", ULONG),
+        ("RegistryQuotaUsed", ULONG),
+        ("Reserved1", PVOID),
+    ]
+SYSTEM_REGISTRY_QUOTA_INFORMATION = _SYSTEM_REGISTRY_QUOTA_INFORMATION
+PSYSTEM_REGISTRY_QUOTA_INFORMATION = POINTER(_SYSTEM_REGISTRY_QUOTA_INFORMATION)
+
+class _SYSTEM_BASIC_INFORMATION(Structure):
+    _fields_ = [
+        ("Reserved1", BYTE * (24)),
+        ("Reserved2", PVOID * (4)),
+        ("NumberOfProcessors", CHAR),
+    ]
+PSYSTEM_BASIC_INFORMATION = POINTER(_SYSTEM_BASIC_INFORMATION)
+SYSTEM_BASIC_INFORMATION = _SYSTEM_BASIC_INFORMATION
+
+class _SYSTEM_PROCESS_INFORMATION_ORIG(Structure):
+    _fields_ = [
+        ("NextEntryOffset", ULONG),
+        ("Reserved1", BYTE * (52)),
+        ("Reserved2", PVOID * (3)),
+        ("UniqueProcessId", HANDLE),
+        ("Reserved3", PVOID),
+        ("HandleCount", ULONG),
+        ("Reserved4", BYTE * (4)),
+        ("Reserved5", PVOID * (11)),
+        ("PeakPagefileUsage", SIZE_T),
+        ("PrivatePageCount", SIZE_T),
+        ("Reserved6", LARGE_INTEGER * (6)),
+    ]
+SYSTEM_PROCESS_INFORMATION_ORIG = _SYSTEM_PROCESS_INFORMATION_ORIG
+PSYSTEM_PROCESS_INFORMATION_ORIG = POINTER(_SYSTEM_PROCESS_INFORMATION_ORIG)
+
 class _TIME_ZONE_INFORMATION(Structure):
     _fields_ = [
         ("Bias", LONG),