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.
12 #include <stdio.h> /* for sprintf() */
13 #include <string.h> /* for memset() and memcpy() */
16 #include "i386-io-windows.h"
18 #ifndef ERROR_NOT_FOUND
19 #define ERROR_NOT_FOUND 1168
22 #ifndef LOAD_LIBRARY_AS_IMAGE_RESOURCE
23 #define LOAD_LIBRARY_AS_IMAGE_RESOURCE 0x20
25 #ifndef LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE
26 #define LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE 0x40
30 #define IOCTL_KLDBG CTL_CODE(FILE_DEVICE_UNKNOWN, 0x1, METHOD_NEITHER, FILE_READ_ACCESS | FILE_WRITE_ACCESS)
34 #define BUS_DATA_TYPE LONG
36 #ifndef PCIConfiguration
37 #define PCIConfiguration (BUS_DATA_TYPE)4
40 #ifndef SYSDBG_COMMAND
41 #define SYSDBG_COMMAND ULONG
43 #ifndef SysDbgReadBusData
44 #define SysDbgReadBusData (SYSDBG_COMMAND)18
46 #ifndef SysDbgWriteBusData
47 #define SysDbgWriteBusData (SYSDBG_COMMAND)19
50 #ifndef SYSDBG_BUS_DATA
51 typedef struct _SYSDBG_BUS_DATA {
55 BUS_DATA_TYPE BusDataType;
58 } SYSDBG_BUS_DATA, *PSYSDBG_BUS_DATA;
59 #define SYSDBG_BUS_DATA SYSDBG_BUS_DATA
62 #ifndef PCI_SEGMENT_BUS_NUMBER
63 typedef struct _PCI_SEGMENT_BUS_NUMBER {
67 ULONG SegmentNumber:16;
72 } PCI_SEGMENT_BUS_NUMBER, *PPCI_SEGMENT_BUS_NUMBER;
73 #define PCI_SEGMENT_BUS_NUMBER PCI_SEGMENT_BUS_NUMBER
76 #ifndef PCI_SLOT_NUMBER
77 typedef struct _PCI_SLOT_NUMBER {
81 ULONG FunctionNumber:3;
86 } PCI_SLOT_NUMBER, *PPCI_SLOT_NUMBER;
87 #define PCI_SLOT_NUMBER PCI_SLOT_NUMBER
91 typedef struct _KLDBG {
92 SYSDBG_COMMAND Command;
99 static BOOL debug_privilege_enabled;
100 static LUID luid_debug_privilege;
101 static BOOL revert_only_privilege;
102 static HANDLE revert_token;
104 static HANDLE kldbg_dev = INVALID_HANDLE_VALUE;
107 win32_kldbg_pci_bus_data(BOOL WriteBusData, USHORT SegmentNumber, BYTE BusNumber, BYTE DeviceNumber, BYTE FunctionNumber, USHORT Address, PVOID Buffer, ULONG BufferSize, LPDWORD Length);
110 win32_strerror(DWORD win32_error_id)
113 * Use static buffer which is large enough.
114 * Hopefully no Win32 API error message string is longer than 4 kB.
116 static char buffer[4096];
119 len = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, win32_error_id, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buffer, sizeof(buffer), NULL);
121 /* FormatMessage() automatically appends ".\r\n" to the error message. */
122 if (len && buffer[len-1] == '\n')
123 buffer[--len] = '\0';
124 if (len && buffer[len-1] == '\r')
125 buffer[--len] = '\0';
126 if (len && buffer[len-1] == '.')
127 buffer[--len] = '\0';
130 sprintf(buffer, "Unknown Win32 error %lu", win32_error_id);
136 win32_is_32bit_on_64bit_system(void)
138 BOOL (WINAPI *MyIsWow64Process)(HANDLE, PBOOL);
142 kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
146 MyIsWow64Process = (void *)GetProcAddress(kernel32, "IsWow64Process");
147 if (!MyIsWow64Process)
150 if (!MyIsWow64Process(GetCurrentProcess(), &is_wow64))
157 win32_get_current_process_machine(void)
159 IMAGE_DOS_HEADER *dos_header;
160 IMAGE_NT_HEADERS *nt_header;
162 dos_header = (IMAGE_DOS_HEADER *)GetModuleHandle(NULL);
163 if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
164 return IMAGE_FILE_MACHINE_UNKNOWN;
166 nt_header = (IMAGE_NT_HEADERS *)((BYTE *)dos_header + dos_header->e_lfanew);
167 if (nt_header->Signature != IMAGE_NT_SIGNATURE)
168 return IMAGE_FILE_MACHINE_UNKNOWN;
170 return nt_header->FileHeader.Machine;
174 win32_check_driver(BYTE *driver_data)
176 IMAGE_DOS_HEADER *dos_header;
177 IMAGE_NT_HEADERS *nt_headers;
178 WORD current_machine;
180 current_machine = win32_get_current_process_machine();
181 if (current_machine == IMAGE_FILE_MACHINE_UNKNOWN)
184 dos_header = (IMAGE_DOS_HEADER *)driver_data;
185 if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
188 nt_headers = (IMAGE_NT_HEADERS *)((BYTE *)dos_header + dos_header->e_lfanew);
189 if (nt_headers->Signature != IMAGE_NT_SIGNATURE)
192 if (nt_headers->FileHeader.Machine != current_machine)
195 if (!(nt_headers->FileHeader.Characteristics & IMAGE_FILE_EXECUTABLE_IMAGE))
199 if (!(nt_headers->FileHeader.Characteristics & IMAGE_FILE_32BIT_MACHINE))
203 /* IMAGE_NT_OPTIONAL_HDR_MAGIC is alias for the header magic used on the target compiler architecture. */
204 if (nt_headers->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR_MAGIC)
207 if (nt_headers->OptionalHeader.Subsystem != IMAGE_SUBSYSTEM_NATIVE)
214 win32_kldbg_unpack_driver(struct pci_access *a, void *driver_path)
216 BOOL use_kd_exe = FALSE;
217 HMODULE exe_with_driver = NULL;
218 HRSRC driver_resource_info = NULL;
219 HGLOBAL driver_resource = NULL;
220 BYTE *driver_data = NULL;
221 DWORD driver_size = 0;
222 HANDLE driver_handle = INVALID_HANDLE_VALUE;
227 /* Try to find and open windbg.exe or kd.exe file in PATH. */
228 exe_with_driver = LoadLibraryEx(TEXT("windbg.exe"), NULL, LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE | LOAD_LIBRARY_AS_IMAGE_RESOURCE);
229 if (!exe_with_driver)
232 exe_with_driver = LoadLibraryEx(TEXT("kd.exe"), NULL, LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE | LOAD_LIBRARY_AS_IMAGE_RESOURCE);
234 if (!exe_with_driver)
236 error = GetLastError();
237 if (error == ERROR_FILE_NOT_FOUND ||
238 error == ERROR_MOD_NOT_FOUND)
239 a->debug("Cannot find windbg.exe or kd.exe file in PATH");
241 a->debug("Cannot load %s file: %s.", use_kd_exe ? "kd.exe" : "windbg.exe", win32_strerror(error));
245 /* kldbgdrv.sys is embedded in windbg.exe/kd.exe as a resource with name id 0x7777 and type id 0x4444. */
246 driver_resource_info = FindResource(exe_with_driver, MAKEINTRESOURCE(0x7777), MAKEINTRESOURCE(0x4444));
247 if (!driver_resource_info)
249 a->debug("Cannot find kldbgdrv.sys resource in %s file: %s.", use_kd_exe ? "kd.exe" : "windbg.exe", win32_strerror(GetLastError()));
253 driver_resource = LoadResource(exe_with_driver, driver_resource_info);
254 if (!driver_resource)
256 a->debug("Cannot load kldbgdrv.sys resource from %s file: %s.", use_kd_exe ? "kd.exe" : "windbg.exe", win32_strerror(GetLastError()));
260 driver_size = SizeofResource(exe_with_driver, driver_resource_info);
263 a->debug("Cannot determinate size of kldbgdrv.sys resource from %s file: %s.", use_kd_exe ? "kd.exe" : "windbg.exe", win32_strerror(GetLastError()));
267 driver_data = LockResource(driver_resource);
270 a->debug("Cannot load kldbgdrv.sys resouce data from %s file: %s.", use_kd_exe ? "kd.exe" : "windbg.exe", win32_strerror(GetLastError()));
274 if (!win32_check_driver(driver_data))
276 a->debug("Cannot use kldbgdrv.sys driver from %s file: Driver is from different architecture.", use_kd_exe ? "kd.exe" : "windbg.exe");
280 driver_handle = CreateFile(driver_path, GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
281 if (driver_handle == INVALID_HANDLE_VALUE)
283 error = GetLastError();
284 if (error != ERROR_FILE_EXISTS)
286 a->debug("Cannot create kldbgdrv.sys driver file in system32 directory: %s.", win32_strerror(error));
289 /* If driver file in system32 directory already exists then treat it as successfull unpack. */
294 if (!WriteFile(driver_handle, driver_data, driver_size, &written, NULL) ||
295 written != driver_size)
297 a->debug("Cannot store kldbgdrv.sys driver file to system32 directory: %s.", win32_strerror(GetLastError()));
298 /* On error, delete file from system32 directory to allow another unpack attempt. */
299 CloseHandle(driver_handle);
300 driver_handle = INVALID_HANDLE_VALUE;
301 DeleteFile(driver_path);
305 a->debug("Driver kldbgdrv.sys was successfully unpacked from %s and stored in system32 directory...", use_kd_exe ? "kd.exe" : "windbg.exe");
309 if (driver_handle != INVALID_HANDLE_VALUE)
310 CloseHandle(driver_handle);
313 FreeResource(driver_resource);
316 FreeLibrary(exe_with_driver);
322 win32_kldbg_register_driver(struct pci_access *a, SC_HANDLE manager, SC_HANDLE *service)
324 UINT (WINAPI *get_system_root_path)(void *buffer, UINT size) = NULL;
327 HANDLE driver_handle;
331 * COM library dbgeng.dll unpacks kldbg driver to file \\system32\\kldbgdrv.sys
332 * and register this driver with service name kldbgdrv. Implement same behavior.
336 * Old Windows versions return path to NT SystemRoot namespace via
337 * GetWindowsDirectory() function. New Windows versions via
338 * GetSystemWindowsDirectory(). GetSystemWindowsDirectory() is not
339 * provided in old Windows versions, so use GetProcAddress() for
340 * compatibility with all Windows versions.
343 kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
345 get_system_root_path = (void *)GetProcAddress(kernel32, "GetSystemWindowsDirectory"
353 if (!get_system_root_path)
354 get_system_root_path = (void *)&GetWindowsDirectory;
356 systemroot_len = get_system_root_path(NULL, 0);
358 systemroot_len = sizeof(TEXT("C:\\Windows\\"));
360 driver_path = pci_malloc(a, systemroot_len + sizeof(TEXT("\\system32\\kldbgdrv.sys")));
362 systemroot_len = get_system_root_path(driver_path, systemroot_len + sizeof(TEXT("")));
365 systemroot_len = sizeof(TEXT("C:\\Windows\\"));
366 memcpy(driver_path, TEXT("C:\\Windows\\"), systemroot_len);
369 if (((char *)driver_path)[systemroot_len-sizeof(TEXT(""))+1] != '\\')
371 ((char *)driver_path)[systemroot_len-sizeof(TEXT(""))+1] = '\\';
372 systemroot_len += sizeof(TEXT(""));
375 memcpy((char *)driver_path + systemroot_len, TEXT("system32\\kldbgdrv.sys"), sizeof(TEXT("system32\\kldbgdrv.sys")));
377 driver_handle = CreateFile(driver_path, 0, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
378 if (driver_handle != INVALID_HANDLE_VALUE)
379 CloseHandle(driver_handle);
380 else if (GetLastError() == ERROR_FILE_NOT_FOUND)
382 a->debug("Driver kldbgdrv.sys is missing, trying to unpack it from windbg.exe or kd.exe...");
383 if (!win32_kldbg_unpack_driver(a, driver_path))
385 pci_mfree(driver_path);
390 *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);
393 if (GetLastError() != ERROR_SERVICE_EXISTS)
395 a->debug("Cannot create kldbgdrv service: %s.", win32_strerror(GetLastError()));
396 pci_mfree(driver_path);
400 *service = OpenService(manager, TEXT("kldbgdrv"), SERVICE_START);
403 a->debug("Cannot open kldbgdrv service: %s.", win32_strerror(GetLastError()));
404 pci_mfree(driver_path);
409 a->debug("Service kldbgdrv was successfully registered...");
410 pci_mfree(driver_path);
415 win32_kldbg_start_driver(struct pci_access *a)
417 SC_HANDLE manager = NULL;
418 SC_HANDLE service = NULL;
422 manager = OpenSCManager(NULL, NULL, SC_MANAGER_CONNECT | SC_MANAGER_CREATE_SERVICE);
424 manager = OpenSCManager(NULL, NULL, SC_MANAGER_CONNECT);
427 a->debug("Cannot open Service Manager: %s.", win32_strerror(GetLastError()));
431 service = OpenService(manager, TEXT("kldbgdrv"), SERVICE_START);
434 error = GetLastError();
435 if (error != ERROR_SERVICE_DOES_NOT_EXIST)
437 a->debug("Cannot open kldbgdrv service: %s.", win32_strerror(error));
441 a->debug("Kernel Local Debugging Driver (kldbgdrv.sys) is not registered, trying to register it...");
443 if (win32_is_32bit_on_64bit_system())
446 a->debug("Registering driver from 32-bit process on 64-bit system is not implemented yet.");
450 if (!win32_kldbg_register_driver(a, manager, &service))
454 if (!StartService(service, 0, NULL))
456 error = GetLastError();
457 if (error != ERROR_SERVICE_ALREADY_RUNNING)
459 a->debug("Cannot start kldbgdrv service: %s.", win32_strerror(error));
464 a->debug("Service kldbgdrv successfully started...");
469 CloseServiceHandle(service);
472 CloseServiceHandle(manager);
478 win32_kldbg_setup(struct pci_access *a)
480 OSVERSIONINFO version;
485 if (kldbg_dev != INVALID_HANDLE_VALUE)
488 /* Check for Windows Vista (NT 6.0). */
489 version.dwOSVersionInfoSize = sizeof(version);
490 if (!GetVersionEx(&version) ||
491 version.dwPlatformId != VER_PLATFORM_WIN32_NT ||
492 version.dwMajorVersion < 6)
494 a->debug("Accessing PCI config space via Kernel Local Debugging Driver requires Windows Vista or higher version.");
498 kldbg_dev = CreateFile(TEXT("\\\\.\\kldbgdrv"), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
499 if (kldbg_dev == INVALID_HANDLE_VALUE)
501 error = GetLastError();
502 if (error != ERROR_FILE_NOT_FOUND)
504 a->debug("Cannot open \"\\\\.\\kldbgdrv\" device: %s.", win32_strerror(error));
508 a->debug("Kernel Local Debugging Driver (kldbgdrv.sys) is not running, trying to start it...");
510 if (!win32_kldbg_start_driver(a))
513 kldbg_dev = CreateFile(TEXT("\\\\.\\kldbgdrv"), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
514 if (kldbg_dev == INVALID_HANDLE_VALUE)
516 error = GetLastError();
517 a->debug("Cannot open \"\\\\.\\kldbgdrv\" device: %s.", win32_strerror(error));
523 * Try to read PCI id register from PCI device 0000:00:00.0.
524 * If this device does not exist and kldbg API is working then
525 * kldbg returns success with read value 0xffffffff.
527 if (win32_kldbg_pci_bus_data(FALSE, 0, 0, 0, 0, 0, &id, sizeof(id), &ret_len) && ret_len == sizeof(id))
530 error = GetLastError();
532 a->debug("Cannot read PCI config space via Kernel Local Debugging Driver: %s.", win32_strerror(error));
534 if (error != ERROR_ACCESS_DENIED)
536 CloseHandle(kldbg_dev);
537 kldbg_dev = INVALID_HANDLE_VALUE;
541 a->debug("..Trying again with Debug privilege...");
543 if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &luid_debug_privilege))
545 a->debug("Debug privilege is not supported.");
546 CloseHandle(kldbg_dev);
547 kldbg_dev = INVALID_HANDLE_VALUE;
551 if (!enable_privilege(luid_debug_privilege, &revert_token, &revert_only_privilege))
553 a->debug("Process does not have right to enable Debug privilege.");
554 CloseHandle(kldbg_dev);
555 kldbg_dev = INVALID_HANDLE_VALUE;
559 if (win32_kldbg_pci_bus_data(FALSE, 0, 0, 0, 0, 0, &id, sizeof(id), &ret_len) && ret_len == sizeof(id))
561 a->debug("Succeeded.");
562 debug_privilege_enabled = TRUE;
566 error = GetLastError();
568 a->debug("Cannot read PCI config space via Kernel Local Debugging Driver: %s.", win32_strerror(error));
570 CloseHandle(kldbg_dev);
571 kldbg_dev = INVALID_HANDLE_VALUE;
573 revert_privilege(luid_debug_privilege, revert_token, revert_only_privilege);
575 revert_only_privilege = FALSE;
580 win32_kldbg_detect(struct pci_access *a)
582 if (!win32_kldbg_setup(a))
589 win32_kldbg_init(struct pci_access *a)
591 if (!win32_kldbg_setup(a))
594 a->error("PCI config space via Kernel Local Debugging Driver cannot be accessed.");
599 win32_kldbg_cleanup(struct pci_access *a UNUSED)
601 if (kldbg_dev == INVALID_HANDLE_VALUE)
604 CloseHandle(kldbg_dev);
605 kldbg_dev = INVALID_HANDLE_VALUE;
607 if (debug_privilege_enabled)
609 revert_privilege(luid_debug_privilege, revert_token, revert_only_privilege);
611 revert_only_privilege = FALSE;
612 debug_privilege_enabled = FALSE;
622 char oem_table_id[8];
624 char asl_compiler_id[4];
625 u32 asl_compiler_revision;
637 win32_kldbg_scan(struct pci_access *a)
640 * There is no kldbg API to retrieve list of PCI segments. WinDBG pci plugin
641 * kext.dll loads debug symbols from pci.pdb file for kernel module pci.sys.
642 * Then it reads kernel memory which belongs to PciSegmentList local variable
643 * which is the first entry of struct _PCI_SEGMENT linked list. And then it
644 * iterates all entries in linked list and reads SegmentNumber for each entry.
646 * This is extremly ugly hack and does not work on systems without installed
647 * kernel debug symbol files.
649 * Do something less ugly. Retrieve ACPI MCFG table via GetSystemFirmwareTable
650 * and parse all PCI segment numbers from it. ACPI MCFG table contains PCIe
651 * ECAM definitions, so all PCI segment numbers.
654 UINT (*WINAPI MyGetSystemFirmwareTable)(DWORD FirmwareTableProviderSignature, DWORD FirmwareTableID, PVOID pFirmwareTableBuffer, DWORD BufferSize);
655 int i, allocations_count;
656 struct acpi_mcfg *mcfg;
662 /* Always scan PCI segment 0. */
663 pci_generic_scan_domain(a, 0);
665 kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
669 /* Function GetSystemFirmwareTable() is available since Windows Vista. */
670 MyGetSystemFirmwareTable = (void *)GetProcAddress(kernel32, "GetSystemFirmwareTable");
671 if (!MyGetSystemFirmwareTable)
674 /* 0x41435049 = 'ACPI', 0x4746434D = 'MCFG' */
675 size = MyGetSystemFirmwareTable(0x41435049, 0x4746434D, NULL, 0);
678 error = GetLastError();
679 if (error == ERROR_INVALID_FUNCTION) /* ACPI is not present, so only PCI segment 0 is available. */
681 else if (error == ERROR_NOT_FOUND) /* MCFG table is not present, so only PCI segment 0 is available. */
683 a->debug("Cannot retrieve ACPI MCFG table: %s.\n", win32_strerror(error));
687 mcfg = pci_malloc(a, size);
689 if (MyGetSystemFirmwareTable(0x41435049, 0x4746434D, mcfg, size) != size)
691 error = GetLastError();
692 a->debug("Cannot retrieve ACPI MCFG table: %s.\n", win32_strerror(error));
697 if (size < sizeof(*mcfg) || size < mcfg->length)
699 a->debug("ACPI MCFG table is broken.\n");
704 segments = pci_malloc(a, 0xFFFF/8);
705 memset(segments, 0, 0xFFFF/8);
707 /* Scan all MCFG allocations and set available PCI segments into bit field. */
708 allocations_count = (mcfg->length - ((unsigned char *)&mcfg->allocations - (unsigned char *)mcfg)) / sizeof(mcfg->allocations[0]);
709 for (i = 0; i < allocations_count; i++)
710 segments[mcfg->allocations[i].pci_segment / 8] |= 1 << (mcfg->allocations[i].pci_segment % 8);
712 /* Skip PCI segment 0 which was already scanned. */
713 for (i = 1; i < 0xFFFF; i++)
714 if (segments[i / 8] & (1 << (i % 8)))
715 pci_generic_scan_domain(a, i);
722 win32_kldbg_pci_bus_data(BOOL WriteBusData, USHORT SegmentNumber, BYTE BusNumber, BYTE DeviceNumber, BYTE FunctionNumber, USHORT Address, PVOID Buffer, ULONG BufferSize, LPDWORD Length)
725 SYSDBG_BUS_DATA sysdbg_cmd;
726 PCI_SLOT_NUMBER pci_slot;
727 PCI_SEGMENT_BUS_NUMBER pci_seg_bus;
729 memset(&pci_slot, 0, sizeof(pci_slot));
730 memset(&sysdbg_cmd, 0, sizeof(sysdbg_cmd));
731 memset(&pci_seg_bus, 0, sizeof(pci_seg_bus));
733 sysdbg_cmd.Address = Address;
734 sysdbg_cmd.Buffer = Buffer;
735 sysdbg_cmd.Request = BufferSize;
736 sysdbg_cmd.BusDataType = PCIConfiguration;
737 pci_seg_bus.u.bits.BusNumber = BusNumber;
738 pci_seg_bus.u.bits.SegmentNumber = SegmentNumber;
739 sysdbg_cmd.BusNumber = pci_seg_bus.u.AsULONG;
740 pci_slot.u.bits.DeviceNumber = DeviceNumber;
741 pci_slot.u.bits.FunctionNumber = FunctionNumber;
742 sysdbg_cmd.SlotNumber = pci_slot.u.AsULONG;
744 kldbg_cmd.Command = WriteBusData ? SysDbgWriteBusData : SysDbgReadBusData;
745 kldbg_cmd.Buffer = &sysdbg_cmd;
746 kldbg_cmd.BufferLength = sizeof(sysdbg_cmd);
749 return DeviceIoControl(kldbg_dev, IOCTL_KLDBG, &kldbg_cmd, sizeof(kldbg_cmd), &sysdbg_cmd, sizeof(sysdbg_cmd), Length, NULL);
753 win32_kldbg_read(struct pci_dev *d, int pos, byte *buf, int len)
757 if ((unsigned int)d->domain > 0xffff)
760 if (!win32_kldbg_pci_bus_data(FALSE, d->domain, d->bus, d->dev, d->func, pos, buf, len, &ret_len))
763 if (ret_len != (unsigned int)len)
770 win32_kldbg_write(struct pci_dev *d, int pos, byte *buf, int len)
774 if ((unsigned int)d->domain > 0xffff)
777 if (!win32_kldbg_pci_bus_data(TRUE, d->domain, d->bus, d->dev, d->func, pos, buf, len, &ret_len))
780 if (ret_len != (unsigned int)len)
786 struct pci_methods pm_win32_kldbg = {
788 "Win32 PCI config space access using Kernel Local Debugging Driver",
794 pci_generic_fill_info,
799 NULL /* cleanup_dev */