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lib/init.c
570 строк
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Jonathan Teh
Update orthography of IDs
28 дек 2025, 23:28
28 дек 2025, 23:28
3e55b2f
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/* * The PCI Library -- Initialization and related things * * Copyright (c) 1997--2024 Martin Mares <mj@ucw.cz> * * Can be freely distributed and used under the terms of the GNU GPL v2+. * * SPDX-License-Identifier: GPL-2.0-or-later */ #include <stdio.h> #include <stdlib.h> #include <stdarg.h> #include <string.h> #include "internal.h" #ifdef PCI_OS_DJGPP #include <crt0.h> /* for __dos_argv0 */ #endif #ifdef PCI_OS_WINDOWS #include <windows.h> /* Force usage of ANSI (char*) variant of GetModuleFileName() function */ #ifdef _WIN32 #ifdef GetModuleFileName #undef GetModuleFileName #endif #define GetModuleFileName GetModuleFileNameA #endif /* Define __ImageBase for all linkers */ #ifdef _WIN32 /* GNU LD provides __ImageBase symbol since 2.19, in previous versions it is * under name _image_base__, so add weak alias for compatibility. */ #ifdef __GNUC__ asm(".weak\t" PCI_STRINGIFY(__MINGW_USYMBOL(__ImageBase)) "\n\t" ".set\t" PCI_STRINGIFY(__MINGW_USYMBOL(__ImageBase)) "," PCI_STRINGIFY(__MINGW_USYMBOL(_image_base__))); #endif /* * MSVC link.exe provides __ImageBase symbol since 12.00 (MSVC 6.0), for * previous versions resolve it at runtime via GetModuleHandleA() which * returns base for main executable or via VirtualQuery() for DLL builds. */ #if defined(_MSC_VER) && _MSC_VER < 1200 static HMODULE get_current_module_handle(void) { #ifdef PCI_SHARED_LIB MEMORY_BASIC_INFORMATION info; size_t len = VirtualQuery(&get_current_module_handle, &info, sizeof(info)); if (len != sizeof(info)) return NULL; return (HMODULE)info.AllocationBase; #else return GetModuleHandleA(NULL); #endif } #define __ImageBase (*(IMAGE_DOS_HEADER *)get_current_module_handle()) #else extern IMAGE_DOS_HEADER __ImageBase; #endif #endif #if defined(_WINDLL) extern HINSTANCE _hModule; #elif defined(_WINDOWS) extern HINSTANCE _hInstance; #endif #endif static struct pci_methods *pci_methods[PCI_ACCESS_MAX] = { NULL, #ifdef PCI_HAVE_PM_LINUX_SYSFS &pm_linux_sysfs, #else NULL, #endif #ifdef PCI_HAVE_PM_LINUX_PROC &pm_linux_proc, #else NULL, #endif #ifdef PCI_HAVE_PM_INTEL_CONF &pm_intel_conf1, &pm_intel_conf2, #else NULL, NULL, #endif #ifdef PCI_HAVE_PM_FBSD_DEVICE &pm_fbsd_device, #else NULL, #endif #ifdef PCI_HAVE_PM_AIX_DEVICE &pm_aix_device, #else NULL, #endif #ifdef PCI_HAVE_PM_NBSD_LIBPCI &pm_nbsd_libpci, #else NULL, #endif #ifdef PCI_HAVE_PM_OBSD_DEVICE &pm_obsd_device, #else NULL, #endif #ifdef PCI_HAVE_PM_DUMP &pm_dump, #else NULL, #endif #ifdef PCI_HAVE_PM_DARWIN_DEVICE &pm_darwin, #else NULL, #endif #ifdef PCI_HAVE_PM_SYLIXOS_DEVICE &pm_sylixos_device, #else NULL, #endif #ifdef PCI_HAVE_PM_HURD_CONF &pm_hurd, #else NULL, #endif #ifdef PCI_HAVE_PM_WIN32_CFGMGR32 &pm_win32_cfgmgr32, #else NULL, #endif #ifdef PCI_HAVE_PM_WIN32_KLDBG &pm_win32_kldbg, #else NULL, #endif #ifdef PCI_HAVE_PM_WIN32_SYSDBG &pm_win32_sysdbg, #else NULL, #endif #ifdef PCI_HAVE_PM_MMIO_CONF &pm_mmio_conf1, &pm_mmio_conf1_ext, #else NULL, NULL, #endif #if defined(PCI_HAVE_PM_ECAM) &pm_ecam, #else NULL, #endif #if defined(PCI_HAVE_PM_AOS_EXPANSION) &pm_aos_expansion, #else NULL, #endif #ifdef PCI_HAVE_PM_RT_THREAD_SMART_DM &pm_rt_thread_smart_dm, #else NULL, #endif }; // If PCI_ACCESS_AUTO is selected, we probe the access methods in this order static int probe_sequence[] = { // System-specific methods PCI_ACCESS_SYS_BUS_PCI, PCI_ACCESS_PROC_BUS_PCI, PCI_ACCESS_FBSD_DEVICE, PCI_ACCESS_AIX_DEVICE, PCI_ACCESS_NBSD_LIBPCI, PCI_ACCESS_OBSD_DEVICE, PCI_ACCESS_DARWIN, PCI_ACCESS_SYLIXOS_DEVICE, PCI_ACCESS_HURD, PCI_ACCESS_WIN32_CFGMGR32, PCI_ACCESS_WIN32_KLDBG, PCI_ACCESS_WIN32_SYSDBG, PCI_ACCESS_AOS_EXPANSION, PCI_ACCESS_RT_THREAD_SMART_DM, // Low-level methods poking the hardware directly PCI_ACCESS_ECAM, PCI_ACCESS_I386_TYPE1, PCI_ACCESS_I386_TYPE2, PCI_ACCESS_MMIO_TYPE1_EXT, PCI_ACCESS_MMIO_TYPE1, -1, }; static void PCI_NONRET pci_generic_error(char *msg, ...) { va_list args; va_start(args, msg); fputs("pcilib: ", stderr); vfprintf(stderr, msg, args); va_end(args); fputc('\n', stderr); exit(1); } static void pci_generic_warn(char *msg, ...) { va_list args; va_start(args, msg); fputs("pcilib: ", stderr); vfprintf(stderr, msg, args); va_end(args); fputc('\n', stderr); } static void pci_generic_debug(char *msg, ...) { va_list args; va_start(args, msg); vfprintf(stdout, msg, args); va_end(args); } static void pci_null_debug(char *msg UNUSED, ...) { } // Memory allocation functions are safe to call if pci_access is not fully initalized or even NULL void * pci_malloc(struct pci_access *a, int size) { void *x = malloc(size); if (!x) (a && a->error ? a->error : pci_generic_error)("Out of memory (allocation of %d bytes failed)", size); return x; } void pci_mfree(void *x) { if (x) free(x); } char * pci_strdup(struct pci_access *a, const char *s) { int len = strlen(s) + 1; char *t = pci_malloc(a, len); memcpy(t, s, len); return t; } int pci_lookup_method(char *name) { int i; for (i=0; i<PCI_ACCESS_MAX; i++) if (pci_methods[i] && !strcmp(pci_methods[i]->name, name)) return i; return -1; } char * pci_get_method_name(int index) { if (index < 0 || index >= PCI_ACCESS_MAX) return NULL; else if (!pci_methods[index]) return ""; else return pci_methods[index]->name; } #if defined(PCI_OS_WINDOWS) || defined(PCI_OS_DJGPP) static void pci_init_name_list_path(struct pci_access *a) { if ((PCI_PATH_IDS_DIR)[0]) pci_set_name_list_path(a, PCI_PATH_IDS_DIR "\\" PCI_IDS, 0); else { char *path, *sep; size_t len; #if defined(PCI_OS_WINDOWS) && (defined(_WIN32) || defined(_WINDLL) || defined(_WINDOWS)) HMODULE module; size_t size; #if defined(_WIN32) module = (HINSTANCE)&__ImageBase; #elif defined(_WINDLL) module = _hModule; #elif defined(_WINDOWS) module = _hInstance; #endif /* * Module file name can have arbitrary length despite all MS examples say * about MAX_PATH upper limit. This limit does not apply for example when * executable is running from network disk with very long UNC paths or * when using "\\??\\" prefix for specifying executable binary path. * Function GetModuleFileName() returns passed size argument when passed * buffer is too small and does not signal any error. In this case retry * again with larger buffer. */ size = 256; /* initial buffer size (more than sizeof(PCI_IDS)-4) */ retry: path = pci_malloc(a, size); len = GetModuleFileName(module, path, size-sizeof(PCI_IDS)-4); /* 4 for "\\\\?\\" */ if (len >= size-sizeof(PCI_IDS)-4) { free(path); size *= 2; goto retry; } else if (len == 0) path[0] = '\0'; /* * GetModuleFileName() has bugs. On Windows 10 it prepends current drive * letter if path is just pure NT namespace (with "\\??\\" prefix). Such * extra drive letter makes path fully invalid and unusable. So remove * extra drive letter to make path valid again. * Reproduce: CreateProcessW("\\??\\C:\\lspci.exe", ...) */ if (((path[0] >= 'a' && path[0] <= 'z') || (path[0] >= 'A' && path[0] <= 'Z')) && strncmp(path+1, ":\\??\\", 5) == 0) { memmove(path, path+2, len-2); len -= 2; path[len] = '\0'; } /* * GetModuleFileName() has bugs. On Windows 10 it does not add "\\\\?\\" * prefix when path is in native NT UNC namespace. Such path is treated by * WinAPI/DOS functions as standard DOS path relative to the current * directory, hence something completely different. So prepend missing * "\\\\?\\" prefix to make path valid again. * Reproduce: CreateProcessW("\\??\\UNC\\10.0.2.4\\qemu\\lspci.exe", ...) * * If path starts with DOS drive letter and with appended PCI_IDS is * longer than 260 bytes and is without "\\\\?\\" prefix then append it. * This prefix is required for paths and file names with DOS drive letter * longer than 260 bytes. */ if (strncmp(path, "\\UNC\\", 5) == 0 || strncmp(path, "UNC\\", 4) == 0 || (((path[0] >= 'a' && path[0] <= 'z') || (path[0] >= 'A' && path[0] <= 'Z')) && len + sizeof(PCI_IDS) >= 260)) { memmove(path+4, path, len); memcpy(path, "\\\\?\\", 4); len += 4; path[len] = '\0'; } #elif defined(PCI_OS_DJGPP) || defined(PCI_OS_WINDOWS) const char *exe_path; #ifdef PCI_OS_DJGPP exe_path = __dos_argv0; #else exe_path = _pgmptr; #endif len = strlen(exe_path); path = pci_malloc(a, len+sizeof(PCI_IDS)); memcpy(path, exe_path, len+1); #endif sep = strrchr(path, '\\'); if (!sep) { /* * If current module path (current executable for static builds or * current DLL library for shared build) cannot be determined then * fallback to the current directory. */ free(path); pci_set_name_list_path(a, PCI_IDS, 0); } else { memcpy(sep+1, PCI_IDS, sizeof(PCI_IDS)); pci_set_name_list_path(a, path, 1); } } } #elif defined PCI_OS_AMIGAOS static void pci_init_name_list_path(struct pci_access *a) { int len = strlen(PCI_PATH_IDS_DIR); if (!len) pci_set_name_list_path(a, PCI_IDS, 0); else { char last_char = PCI_PATH_IDS_DIR[len - 1]; if (last_char == ':' || last_char == '/') // root or parent char pci_set_name_list_path(a, PCI_PATH_IDS_DIR PCI_IDS, 0); else pci_set_name_list_path(a, PCI_PATH_IDS_DIR "/" PCI_IDS, 0); } } #else static void pci_init_name_list_path(struct pci_access *a) { pci_set_name_list_path(a, PCI_PATH_IDS_DIR "/" PCI_IDS, 0); } #endif #ifdef PCI_USE_DNS static void pci_init_dns(struct pci_access *a) { pci_define_param(a, "net.domain", PCI_ID_DOMAIN, "DNS domain used for resolving of IDs"); a->id_lookup_mode = PCI_LOOKUP_CACHE; char *cache_dir = getenv("XDG_CACHE_HOME"); if (!cache_dir) cache_dir = "~/.cache"; int name_len = strlen(cache_dir) + 32; char *cache_name = pci_malloc(NULL, name_len); snprintf(cache_name, name_len, "%s/pci-ids", cache_dir); struct pci_param *param = pci_define_param(a, "net.cache_name", cache_name, "Name of the ID cache file"); param->value_malloced = 1; } #endif struct pci_access * pci_alloc(void) { struct pci_access *a = pci_malloc(NULL, sizeof(struct pci_access)); int i; memset(a, 0, sizeof(*a)); pci_init_name_list_path(a); #ifdef PCI_USE_DNS pci_init_dns(a); #endif #ifdef PCI_HAVE_HWDB pci_define_param(a, "hwdb.disable", "0", "Do not look up names in UDEV's HWDB if non-zero"); #endif for (i=0; i<PCI_ACCESS_MAX; i++) if (pci_methods[i] && pci_methods[i]->config) pci_methods[i]->config(a); return a; } int pci_init_internal(struct pci_access *a, int skip_method) { if (!a->error) a->error = pci_generic_error; if (!a->warning) a->warning = pci_generic_warn; if (!a->debug) a->debug = pci_generic_debug; if (!a->debugging) a->debug = pci_null_debug; if (a->method != PCI_ACCESS_AUTO) { if (a->method >= PCI_ACCESS_MAX || !pci_methods[a->method]) a->error("This access method is not supported."); a->methods = pci_methods[a->method]; } else { unsigned int i; for (i=0; probe_sequence[i] >= 0; i++) { struct pci_methods *m = pci_methods[probe_sequence[i]]; if (!m) continue; if (skip_method == probe_sequence[i]) continue; a->debug("Trying method %s...", m->name); if (m->detect(a)) { a->debug("...OK\n"); a->methods = m; a->method = probe_sequence[i]; break; } a->debug("...No.\n"); } if (!a->methods) return 0; } a->debug("Decided to use %s\n", a->methods->name); a->methods->init(a); return 1; } void pci_init_v35(struct pci_access *a) { if (!pci_init_internal(a, -1)) a->error("Cannot find any working access method."); } STATIC_ALIAS(void pci_init(struct pci_access *a), pci_init_v35(a)); DEFINE_ALIAS(void pci_init_v30(struct pci_access *a), pci_init_v35); SYMBOL_VERSION(pci_init_v30, pci_init@LIBPCI_3.0); SYMBOL_VERSION(pci_init_v35, pci_init@@LIBPCI_3.5); struct pci_access * pci_clone_access(struct pci_access *a) { struct pci_access *b = pci_alloc(); b->writeable = a->writeable; b->buscentric = a->buscentric; b->debugging = a->debugging; b->error = a->error; b->warning = a->warning; b->debug = a->debug; return b; } void pci_cleanup(struct pci_access *a) { struct pci_dev *d, *e; for (d=a->devices; d; d=e) { e = d->next; pci_free_dev(d); } if (a->methods) a->methods->cleanup(a); pci_free_name_list(a); pci_free_params(a); pci_set_name_list_path(a, NULL, 0); pci_mfree(a); }