2 * The PCI Library -- PCI config space access using Kernel Local Debugging Driver
4 * Copyright (c) 2022 Pali Rohár <pali@kernel.org>
6 * Can be freely distributed and used under the terms of the GNU GPL v2+.
8 * SPDX-License-Identifier: GPL-2.0-or-later
14 #include <stdio.h> /* for sprintf() */
15 #include <string.h> /* for memset() and memcpy() */
18 #include "i386-io-windows.h"
20 #ifndef ERROR_NOT_FOUND
21 #define ERROR_NOT_FOUND 1168
24 #ifndef LOAD_LIBRARY_AS_IMAGE_RESOURCE
25 #define LOAD_LIBRARY_AS_IMAGE_RESOURCE 0x20
27 #ifndef LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE
28 #define LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE 0x40
32 #define IOCTL_KLDBG CTL_CODE(FILE_DEVICE_UNKNOWN, 0x1, METHOD_NEITHER, FILE_READ_ACCESS | FILE_WRITE_ACCESS)
36 #define BUS_DATA_TYPE LONG
38 #ifndef PCIConfiguration
39 #define PCIConfiguration (BUS_DATA_TYPE)4
42 #ifndef SYSDBG_COMMAND
43 #define SYSDBG_COMMAND ULONG
45 #ifndef SysDbgReadBusData
46 #define SysDbgReadBusData (SYSDBG_COMMAND)18
48 #ifndef SysDbgWriteBusData
49 #define SysDbgWriteBusData (SYSDBG_COMMAND)19
52 #ifndef SYSDBG_BUS_DATA
53 typedef struct _SYSDBG_BUS_DATA {
57 BUS_DATA_TYPE BusDataType;
60 } SYSDBG_BUS_DATA, *PSYSDBG_BUS_DATA;
61 #define SYSDBG_BUS_DATA SYSDBG_BUS_DATA
64 #ifndef PCI_SEGMENT_BUS_NUMBER
65 typedef struct _PCI_SEGMENT_BUS_NUMBER {
69 ULONG SegmentNumber:16;
74 } PCI_SEGMENT_BUS_NUMBER, *PPCI_SEGMENT_BUS_NUMBER;
75 #define PCI_SEGMENT_BUS_NUMBER PCI_SEGMENT_BUS_NUMBER
78 #ifndef PCI_SLOT_NUMBER
79 typedef struct _PCI_SLOT_NUMBER {
83 ULONG FunctionNumber:3;
88 } PCI_SLOT_NUMBER, *PPCI_SLOT_NUMBER;
89 #define PCI_SLOT_NUMBER PCI_SLOT_NUMBER
93 typedef struct _KLDBG {
94 SYSDBG_COMMAND Command;
101 static BOOL debug_privilege_enabled;
102 static LUID luid_debug_privilege;
103 static BOOL revert_only_privilege;
104 static HANDLE revert_token;
106 static HANDLE kldbg_dev = INVALID_HANDLE_VALUE;
109 win32_kldbg_pci_bus_data(BOOL WriteBusData, USHORT SegmentNumber, BYTE BusNumber, BYTE DeviceNumber, BYTE FunctionNumber, USHORT Address, PVOID Buffer, ULONG BufferSize, LPDWORD Length);
112 win32_strerror(DWORD win32_error_id)
115 * Use static buffer which is large enough.
116 * Hopefully no Win32 API error message string is longer than 4 kB.
118 static char buffer[4096];
121 len = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, win32_error_id, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buffer, sizeof(buffer), NULL);
123 /* FormatMessage() automatically appends ".\r\n" to the error message. */
124 if (len && buffer[len-1] == '\n')
125 buffer[--len] = '\0';
126 if (len && buffer[len-1] == '\r')
127 buffer[--len] = '\0';
128 if (len && buffer[len-1] == '.')
129 buffer[--len] = '\0';
132 sprintf(buffer, "Unknown Win32 error %lu", win32_error_id);
138 win32_is_32bit_on_64bit_system(void)
140 BOOL (WINAPI *MyIsWow64Process)(HANDLE, PBOOL);
144 kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
148 MyIsWow64Process = (void *)GetProcAddress(kernel32, "IsWow64Process");
149 if (!MyIsWow64Process)
152 if (!MyIsWow64Process(GetCurrentProcess(), &is_wow64))
159 win32_get_current_process_machine(void)
161 IMAGE_DOS_HEADER *dos_header;
162 IMAGE_NT_HEADERS *nt_header;
164 dos_header = (IMAGE_DOS_HEADER *)GetModuleHandle(NULL);
165 if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
166 return IMAGE_FILE_MACHINE_UNKNOWN;
168 nt_header = (IMAGE_NT_HEADERS *)((BYTE *)dos_header + dos_header->e_lfanew);
169 if (nt_header->Signature != IMAGE_NT_SIGNATURE)
170 return IMAGE_FILE_MACHINE_UNKNOWN;
172 return nt_header->FileHeader.Machine;
176 win32_check_driver(BYTE *driver_data)
178 IMAGE_DOS_HEADER *dos_header;
179 IMAGE_NT_HEADERS *nt_headers;
180 WORD current_machine;
182 current_machine = win32_get_current_process_machine();
183 if (current_machine == IMAGE_FILE_MACHINE_UNKNOWN)
186 dos_header = (IMAGE_DOS_HEADER *)driver_data;
187 if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
190 nt_headers = (IMAGE_NT_HEADERS *)((BYTE *)dos_header + dos_header->e_lfanew);
191 if (nt_headers->Signature != IMAGE_NT_SIGNATURE)
194 if (nt_headers->FileHeader.Machine != current_machine)
197 if (!(nt_headers->FileHeader.Characteristics & IMAGE_FILE_EXECUTABLE_IMAGE))
201 if (!(nt_headers->FileHeader.Characteristics & IMAGE_FILE_32BIT_MACHINE))
205 /* IMAGE_NT_OPTIONAL_HDR_MAGIC is alias for the header magic used on the target compiler architecture. */
206 if (nt_headers->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR_MAGIC)
209 if (nt_headers->OptionalHeader.Subsystem != IMAGE_SUBSYSTEM_NATIVE)
216 win32_kldbg_unpack_driver(struct pci_access *a, void *driver_path)
218 BOOL use_kd_exe = FALSE;
219 HMODULE exe_with_driver = NULL;
220 HRSRC driver_resource_info = NULL;
221 HGLOBAL driver_resource = NULL;
222 BYTE *driver_data = NULL;
223 DWORD driver_size = 0;
224 HANDLE driver_handle = INVALID_HANDLE_VALUE;
229 /* Try to find and open windbg.exe or kd.exe file in PATH. */
230 exe_with_driver = LoadLibraryEx(TEXT("windbg.exe"), NULL, LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE | LOAD_LIBRARY_AS_IMAGE_RESOURCE);
231 if (!exe_with_driver)
234 exe_with_driver = LoadLibraryEx(TEXT("kd.exe"), NULL, LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE | LOAD_LIBRARY_AS_IMAGE_RESOURCE);
236 if (!exe_with_driver)
238 error = GetLastError();
239 if (error == ERROR_FILE_NOT_FOUND ||
240 error == ERROR_MOD_NOT_FOUND)
241 a->debug("Cannot find windbg.exe or kd.exe file in PATH");
243 a->debug("Cannot load %s file: %s.", use_kd_exe ? "kd.exe" : "windbg.exe", win32_strerror(error));
247 /* kldbgdrv.sys is embedded in windbg.exe/kd.exe as a resource with name id 0x7777 and type id 0x4444. */
248 driver_resource_info = FindResource(exe_with_driver, MAKEINTRESOURCE(0x7777), MAKEINTRESOURCE(0x4444));
249 if (!driver_resource_info)
251 a->debug("Cannot find kldbgdrv.sys resource in %s file: %s.", use_kd_exe ? "kd.exe" : "windbg.exe", win32_strerror(GetLastError()));
255 driver_resource = LoadResource(exe_with_driver, driver_resource_info);
256 if (!driver_resource)
258 a->debug("Cannot load kldbgdrv.sys resource from %s file: %s.", use_kd_exe ? "kd.exe" : "windbg.exe", win32_strerror(GetLastError()));
262 driver_size = SizeofResource(exe_with_driver, driver_resource_info);
265 a->debug("Cannot determinate size of kldbgdrv.sys resource from %s file: %s.", use_kd_exe ? "kd.exe" : "windbg.exe", win32_strerror(GetLastError()));
269 driver_data = LockResource(driver_resource);
272 a->debug("Cannot load kldbgdrv.sys resouce data from %s file: %s.", use_kd_exe ? "kd.exe" : "windbg.exe", win32_strerror(GetLastError()));
276 if (!win32_check_driver(driver_data))
278 a->debug("Cannot use kldbgdrv.sys driver from %s file: Driver is from different architecture.", use_kd_exe ? "kd.exe" : "windbg.exe");
282 driver_handle = CreateFile(driver_path, GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
283 if (driver_handle == INVALID_HANDLE_VALUE)
285 error = GetLastError();
286 if (error != ERROR_FILE_EXISTS)
288 a->debug("Cannot create kldbgdrv.sys driver file in system32 directory: %s.", win32_strerror(error));
291 /* If driver file in system32 directory already exists then treat it as successfull unpack. */
296 if (!WriteFile(driver_handle, driver_data, driver_size, &written, NULL) ||
297 written != driver_size)
299 a->debug("Cannot store kldbgdrv.sys driver file to system32 directory: %s.", win32_strerror(GetLastError()));
300 /* On error, delete file from system32 directory to allow another unpack attempt. */
301 CloseHandle(driver_handle);
302 driver_handle = INVALID_HANDLE_VALUE;
303 DeleteFile(driver_path);
307 a->debug("Driver kldbgdrv.sys was successfully unpacked from %s and stored in system32 directory...", use_kd_exe ? "kd.exe" : "windbg.exe");
311 if (driver_handle != INVALID_HANDLE_VALUE)
312 CloseHandle(driver_handle);
315 FreeResource(driver_resource);
318 FreeLibrary(exe_with_driver);
324 win32_kldbg_register_driver(struct pci_access *a, SC_HANDLE manager, SC_HANDLE *service)
326 UINT (WINAPI *get_system_root_path)(void *buffer, UINT size) = NULL;
329 HANDLE driver_handle;
333 * COM library dbgeng.dll unpacks kldbg driver to file \\system32\\kldbgdrv.sys
334 * and register this driver with service name kldbgdrv. Implement same behavior.
338 * Old Windows versions return path to NT SystemRoot namespace via
339 * GetWindowsDirectory() function. New Windows versions via
340 * GetSystemWindowsDirectory(). GetSystemWindowsDirectory() is not
341 * provided in old Windows versions, so use GetProcAddress() for
342 * compatibility with all Windows versions.
345 kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
347 get_system_root_path = (void *)GetProcAddress(kernel32, "GetSystemWindowsDirectory"
355 if (!get_system_root_path)
356 get_system_root_path = (void *)&GetWindowsDirectory;
358 systemroot_len = get_system_root_path(NULL, 0);
360 systemroot_len = sizeof(TEXT("C:\\Windows\\"));
362 driver_path = pci_malloc(a, systemroot_len + sizeof(TEXT("\\system32\\kldbgdrv.sys")));
364 systemroot_len = get_system_root_path(driver_path, systemroot_len + sizeof(TEXT("")));
367 systemroot_len = sizeof(TEXT("C:\\Windows\\"));
368 memcpy(driver_path, TEXT("C:\\Windows\\"), systemroot_len);
371 if (((char *)driver_path)[systemroot_len-sizeof(TEXT(""))+1] != '\\')
373 ((char *)driver_path)[systemroot_len-sizeof(TEXT(""))+1] = '\\';
374 systemroot_len += sizeof(TEXT(""));
377 memcpy((char *)driver_path + systemroot_len, TEXT("system32\\kldbgdrv.sys"), sizeof(TEXT("system32\\kldbgdrv.sys")));
379 driver_handle = CreateFile(driver_path, 0, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
380 if (driver_handle != INVALID_HANDLE_VALUE)
381 CloseHandle(driver_handle);
382 else if (GetLastError() == ERROR_FILE_NOT_FOUND)
384 a->debug("Driver kldbgdrv.sys is missing, trying to unpack it from windbg.exe or kd.exe...");
385 if (!win32_kldbg_unpack_driver(a, driver_path))
387 pci_mfree(driver_path);
392 *service = CreateService(manager, TEXT("kldbgdrv"), TEXT("kldbgdrv"), SERVICE_START, SERVICE_KERNEL_DRIVER, SERVICE_DEMAND_START, SERVICE_ERROR_NORMAL, driver_path, NULL, NULL, NULL, NULL, NULL);
395 if (GetLastError() != ERROR_SERVICE_EXISTS)
397 a->debug("Cannot create kldbgdrv service: %s.", win32_strerror(GetLastError()));
398 pci_mfree(driver_path);
402 *service = OpenService(manager, TEXT("kldbgdrv"), SERVICE_START);
405 a->debug("Cannot open kldbgdrv service: %s.", win32_strerror(GetLastError()));
406 pci_mfree(driver_path);
411 a->debug("Service kldbgdrv was successfully registered...");
412 pci_mfree(driver_path);
417 win32_kldbg_start_driver(struct pci_access *a)
419 SC_HANDLE manager = NULL;
420 SC_HANDLE service = NULL;
424 manager = OpenSCManager(NULL, NULL, SC_MANAGER_CONNECT | SC_MANAGER_CREATE_SERVICE);
426 manager = OpenSCManager(NULL, NULL, SC_MANAGER_CONNECT);
429 a->debug("Cannot open Service Manager: %s.", win32_strerror(GetLastError()));
433 service = OpenService(manager, TEXT("kldbgdrv"), SERVICE_START);
436 error = GetLastError();
437 if (error != ERROR_SERVICE_DOES_NOT_EXIST)
439 a->debug("Cannot open kldbgdrv service: %s.", win32_strerror(error));
443 a->debug("Kernel Local Debugging Driver (kldbgdrv.sys) is not registered, trying to register it...");
445 if (win32_is_32bit_on_64bit_system())
448 a->debug("Registering driver from 32-bit process on 64-bit system is not implemented yet.");
452 if (!win32_kldbg_register_driver(a, manager, &service))
456 if (!StartService(service, 0, NULL))
458 error = GetLastError();
459 if (error != ERROR_SERVICE_ALREADY_RUNNING)
461 a->debug("Cannot start kldbgdrv service: %s.", win32_strerror(error));
466 a->debug("Service kldbgdrv successfully started...");
471 CloseServiceHandle(service);
474 CloseServiceHandle(manager);
480 win32_kldbg_setup(struct pci_access *a)
482 OSVERSIONINFO version;
487 if (kldbg_dev != INVALID_HANDLE_VALUE)
490 /* Check for Windows Vista (NT 6.0). */
491 version.dwOSVersionInfoSize = sizeof(version);
492 if (!GetVersionEx(&version) ||
493 version.dwPlatformId != VER_PLATFORM_WIN32_NT ||
494 version.dwMajorVersion < 6)
496 a->debug("Accessing PCI config space via Kernel Local Debugging Driver requires Windows Vista or higher version.");
500 kldbg_dev = CreateFile(TEXT("\\\\.\\kldbgdrv"), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
501 if (kldbg_dev == INVALID_HANDLE_VALUE)
503 error = GetLastError();
504 if (error != ERROR_FILE_NOT_FOUND)
506 a->debug("Cannot open \"\\\\.\\kldbgdrv\" device: %s.", win32_strerror(error));
510 a->debug("Kernel Local Debugging Driver (kldbgdrv.sys) is not running, trying to start it...");
512 if (!win32_kldbg_start_driver(a))
515 kldbg_dev = CreateFile(TEXT("\\\\.\\kldbgdrv"), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
516 if (kldbg_dev == INVALID_HANDLE_VALUE)
518 error = GetLastError();
519 a->debug("Cannot open \"\\\\.\\kldbgdrv\" device: %s.", win32_strerror(error));
525 * Try to read PCI id register from PCI device 0000:00:00.0.
526 * If this device does not exist and kldbg API is working then
527 * kldbg returns success with read value 0xffffffff.
529 if (win32_kldbg_pci_bus_data(FALSE, 0, 0, 0, 0, 0, &id, sizeof(id), &ret_len) && ret_len == sizeof(id))
532 error = GetLastError();
534 a->debug("Cannot read PCI config space via Kernel Local Debugging Driver: %s.", win32_strerror(error));
536 if (error != ERROR_ACCESS_DENIED)
538 CloseHandle(kldbg_dev);
539 kldbg_dev = INVALID_HANDLE_VALUE;
543 a->debug("..Trying again with Debug privilege...");
545 if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &luid_debug_privilege))
547 a->debug("Debug privilege is not supported.");
548 CloseHandle(kldbg_dev);
549 kldbg_dev = INVALID_HANDLE_VALUE;
553 if (!enable_privilege(luid_debug_privilege, &revert_token, &revert_only_privilege))
555 a->debug("Process does not have right to enable Debug privilege.");
556 CloseHandle(kldbg_dev);
557 kldbg_dev = INVALID_HANDLE_VALUE;
561 if (win32_kldbg_pci_bus_data(FALSE, 0, 0, 0, 0, 0, &id, sizeof(id), &ret_len) && ret_len == sizeof(id))
563 a->debug("Succeeded.");
564 debug_privilege_enabled = TRUE;
568 error = GetLastError();
570 a->debug("Cannot read PCI config space via Kernel Local Debugging Driver: %s.", win32_strerror(error));
572 CloseHandle(kldbg_dev);
573 kldbg_dev = INVALID_HANDLE_VALUE;
575 revert_privilege(luid_debug_privilege, revert_token, revert_only_privilege);
577 revert_only_privilege = FALSE;
582 win32_kldbg_detect(struct pci_access *a)
584 if (!win32_kldbg_setup(a))
591 win32_kldbg_init(struct pci_access *a)
593 if (!win32_kldbg_setup(a))
596 a->error("PCI config space via Kernel Local Debugging Driver cannot be accessed.");
601 win32_kldbg_cleanup(struct pci_access *a UNUSED)
603 if (kldbg_dev == INVALID_HANDLE_VALUE)
606 CloseHandle(kldbg_dev);
607 kldbg_dev = INVALID_HANDLE_VALUE;
609 if (debug_privilege_enabled)
611 revert_privilege(luid_debug_privilege, revert_token, revert_only_privilege);
613 revert_only_privilege = FALSE;
614 debug_privilege_enabled = FALSE;
624 char oem_table_id[8];
626 char asl_compiler_id[4];
627 u32 asl_compiler_revision;
639 win32_kldbg_scan(struct pci_access *a)
642 * There is no kldbg API to retrieve list of PCI segments. WinDBG pci plugin
643 * kext.dll loads debug symbols from pci.pdb file for kernel module pci.sys.
644 * Then it reads kernel memory which belongs to PciSegmentList local variable
645 * which is the first entry of struct _PCI_SEGMENT linked list. And then it
646 * iterates all entries in linked list and reads SegmentNumber for each entry.
648 * This is extremly ugly hack and does not work on systems without installed
649 * kernel debug symbol files.
651 * Do something less ugly. Retrieve ACPI MCFG table via GetSystemFirmwareTable
652 * and parse all PCI segment numbers from it. ACPI MCFG table contains PCIe
653 * ECAM definitions, so all PCI segment numbers.
656 UINT (*WINAPI MyGetSystemFirmwareTable)(DWORD FirmwareTableProviderSignature, DWORD FirmwareTableID, PVOID pFirmwareTableBuffer, DWORD BufferSize);
657 int i, allocations_count;
658 struct acpi_mcfg *mcfg;
664 /* Always scan PCI segment 0. */
665 pci_generic_scan_domain(a, 0);
667 kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
671 /* Function GetSystemFirmwareTable() is available since Windows Vista. */
672 MyGetSystemFirmwareTable = (void *)GetProcAddress(kernel32, "GetSystemFirmwareTable");
673 if (!MyGetSystemFirmwareTable)
676 /* 0x41435049 = 'ACPI', 0x4746434D = 'MCFG' */
677 size = MyGetSystemFirmwareTable(0x41435049, 0x4746434D, NULL, 0);
680 error = GetLastError();
681 if (error == ERROR_INVALID_FUNCTION) /* ACPI is not present, so only PCI segment 0 is available. */
683 else if (error == ERROR_NOT_FOUND) /* MCFG table is not present, so only PCI segment 0 is available. */
685 a->debug("Cannot retrieve ACPI MCFG table: %s.\n", win32_strerror(error));
689 mcfg = pci_malloc(a, size);
691 if (MyGetSystemFirmwareTable(0x41435049, 0x4746434D, mcfg, size) != size)
693 error = GetLastError();
694 a->debug("Cannot retrieve ACPI MCFG table: %s.\n", win32_strerror(error));
699 if (size < sizeof(*mcfg) || size < mcfg->length)
701 a->debug("ACPI MCFG table is broken.\n");
706 segments = pci_malloc(a, 0xFFFF/8);
707 memset(segments, 0, 0xFFFF/8);
709 /* Scan all MCFG allocations and set available PCI segments into bit field. */
710 allocations_count = (mcfg->length - ((unsigned char *)&mcfg->allocations - (unsigned char *)mcfg)) / sizeof(mcfg->allocations[0]);
711 for (i = 0; i < allocations_count; i++)
712 segments[mcfg->allocations[i].pci_segment / 8] |= 1 << (mcfg->allocations[i].pci_segment % 8);
714 /* Skip PCI segment 0 which was already scanned. */
715 for (i = 1; i < 0xFFFF; i++)
716 if (segments[i / 8] & (1 << (i % 8)))
717 pci_generic_scan_domain(a, i);
724 win32_kldbg_pci_bus_data(BOOL WriteBusData, USHORT SegmentNumber, BYTE BusNumber, BYTE DeviceNumber, BYTE FunctionNumber, USHORT Address, PVOID Buffer, ULONG BufferSize, LPDWORD Length)
727 SYSDBG_BUS_DATA sysdbg_cmd;
728 PCI_SLOT_NUMBER pci_slot;
729 PCI_SEGMENT_BUS_NUMBER pci_seg_bus;
731 memset(&pci_slot, 0, sizeof(pci_slot));
732 memset(&sysdbg_cmd, 0, sizeof(sysdbg_cmd));
733 memset(&pci_seg_bus, 0, sizeof(pci_seg_bus));
735 sysdbg_cmd.Address = Address;
736 sysdbg_cmd.Buffer = Buffer;
737 sysdbg_cmd.Request = BufferSize;
738 sysdbg_cmd.BusDataType = PCIConfiguration;
739 pci_seg_bus.u.bits.BusNumber = BusNumber;
740 pci_seg_bus.u.bits.SegmentNumber = SegmentNumber;
741 sysdbg_cmd.BusNumber = pci_seg_bus.u.AsULONG;
742 pci_slot.u.bits.DeviceNumber = DeviceNumber;
743 pci_slot.u.bits.FunctionNumber = FunctionNumber;
744 sysdbg_cmd.SlotNumber = pci_slot.u.AsULONG;
746 kldbg_cmd.Command = WriteBusData ? SysDbgWriteBusData : SysDbgReadBusData;
747 kldbg_cmd.Buffer = &sysdbg_cmd;
748 kldbg_cmd.BufferLength = sizeof(sysdbg_cmd);
751 return DeviceIoControl(kldbg_dev, IOCTL_KLDBG, &kldbg_cmd, sizeof(kldbg_cmd), &sysdbg_cmd, sizeof(sysdbg_cmd), Length, NULL);
755 win32_kldbg_read(struct pci_dev *d, int pos, byte *buf, int len)
759 if ((unsigned int)d->domain > 0xffff)
762 if (!win32_kldbg_pci_bus_data(FALSE, d->domain, d->bus, d->dev, d->func, pos, buf, len, &ret_len))
765 if (ret_len != (unsigned int)len)
772 win32_kldbg_write(struct pci_dev *d, int pos, byte *buf, int len)
776 if ((unsigned int)d->domain > 0xffff)
779 if (!win32_kldbg_pci_bus_data(TRUE, d->domain, d->bus, d->dev, d->func, pos, buf, len, &ret_len))
782 if (ret_len != (unsigned int)len)
788 struct pci_methods pm_win32_kldbg = {
790 "Win32 PCI config space access using Kernel Local Debugging Driver",
796 pci_generic_fill_info,
801 NULL /* cleanup_dev */