/*
* The PCI Library -- Initialization and related things
*
- * Copyright (c) 1997--2018 Martin Mares <mj@ucw.cz>
+ * Copyright (c) 1997--2024 Martin Mares <mj@ucw.cz>
*
- * Can be freely distributed and used under the terms of the GNU GPL.
+ * 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 "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] = {
#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
};
// If PCI_ACCESS_AUTO is selected, we probe the access methods in this order
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,
// 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
+static void PCI_NONRET
pci_generic_error(char *msg, ...)
{
va_list args;
return pci_methods[index]->name;
}
-struct pci_access *
-pci_alloc(void)
-{
- struct pci_access *a = pci_malloc(NULL, sizeof(struct pci_access));
- int i;
+#if defined(PCI_OS_WINDOWS) || defined(PCI_OS_DJGPP)
- memset(a, 0, sizeof(*a));
-#ifdef PCI_OS_WINDOWS
+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;
- DWORD len;
+ 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);
- path = pci_malloc(a, MAX_PATH+1);
- len = GetModuleFileNameA(NULL, path, MAX_PATH+1);
- sep = (len > 0) ? strrchr(path, '\\') : NULL;
- if (len == 0 || len == MAX_PATH+1 || !sep || MAX_PATH-(size_t)(sep+1-path) < sizeof(PCI_IDS))
- free(path);
+#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 ID's");
- pci_define_param(a, "net.cache_name", "~/.pciids-cache", "Name of the ID cache file");
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");
return a;
}
-void
-pci_init_v35(struct pci_access *a)
+int
+pci_init_internal(struct pci_access *a, int skip_method)
{
if (!a->error)
a->error = pci_generic_error;
if (!a->debugging)
a->debug = pci_null_debug;
- if (a->method)
+ if (a->method != PCI_ACCESS_AUTO)
{
if (a->method >= PCI_ACCESS_MAX || !pci_methods[a->method])
a->error("This access method is not supported.");
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("...No.\n");
}
if (!a->methods)
- a->error("Cannot find any working access method.");
+ 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));
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)
{
projects / pciutils.git / blobdiff