diff options
Diffstat (limited to 'qemu/roms/openbios/arch/unix/plugins.c')
| -rw-r--r-- | qemu/roms/openbios/arch/unix/plugins.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/qemu/roms/openbios/arch/unix/plugins.c b/qemu/roms/openbios/arch/unix/plugins.c new file mode 100644 index 000000000..855454b0e --- /dev/null +++ b/qemu/roms/openbios/arch/unix/plugins.c @@ -0,0 +1,197 @@ +/* tag: plugin interface for openbios forth kernel + * + * Copyright (C) 2003, 2004 Stefan Reinauer + * + * See the file "COPYING" for further information about + * the copyright and warranty status of this work. + */ + +#include "sysinclude.h" +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <dlfcn.h> + +#include "unix/plugins.h" + +unsigned char *plugindir = "/usr/share/OpenBIOS/plugins"; +#define PLUGINDIR plugindir +#define PATHSIZE 256 + +#define CONFIG_DEBUG_PLUGINS + +typedef struct iorange iorange_t; +struct iorange { + const char *name; + unsigned int start; + unsigned int end; + io_ops_t *ops; + iorange_t *next; +}; + +static iorange_t *ioranges = NULL; + +typedef struct plugin plugin_t; +struct plugin { + const char *name; + plugin_t *next; +}; + +static plugin_t *plugins = NULL; + +io_ops_t *find_iorange(u32 reg) +{ + iorange_t *range = ioranges; + while (range) { + if (range->start <= reg && range->end >= reg) + return range->ops; + range = range->next; + } + return NULL; +} + +int register_iorange(const char *name, io_ops_t * ops, unsigned int rstart, + unsigned int rend) +{ + iorange_t *newrange; + + /* intersection check */ + newrange = ioranges; + while (newrange) { + int fail = 0; + /* new section swallows old section */ + if (newrange->start >= rstart && newrange->end <= rend) + fail = -1; + /* new section start or end point are within range */ + if (newrange->start <= rstart && newrange->end >= rstart) + fail = -1; + if (newrange->start <= rend && newrange->end >= rend) + fail = -1; + if (fail) { + printf("Error: overlapping IO regions: %s and %s\n", + newrange->name, name); + return -1; + } + newrange = newrange->next; + } + + newrange = malloc(sizeof(iorange_t)); + + newrange->name = name; + newrange->ops = ops; + newrange->start = rstart; + newrange->end = rend; + newrange->next = ioranges; + + ioranges = newrange; + + return 0; +} + +int is_loaded(const char *plugin_name) +{ + plugin_t *p = plugins; + while (p) { + if (!strcmp(plugin_name, p->name)) + return -1; + p = p->next; + } + return 0; +} + +int load_plugin(const char *plugin_name) +{ + void *handle; + char *error; + char path[PATHSIZE]; + + int (*init_plugin) (void); + char **deps; + char **plugin_info; + plugin_t *p; + + if (is_loaded(plugin_name)) { + printf("Plugin %s already loaded.\n", plugin_name); + return 0; + } + + strncpy(path, PLUGINDIR, PATHSIZE); + strncat(path, "/plugin_", PATHSIZE); + strncat(path, plugin_name, PATHSIZE); + strncat(path, ".so", PATHSIZE); + +#if DEBUG + printf("Opening plugin %s\n", path); +#endif + + handle = dlopen(path, RTLD_LAZY | RTLD_GLOBAL); + if (!handle) { + error = dlerror(); + printf("Error: Could not open plugin \"%s\": %s\n", + plugin_name, error); + exit(1); + } +#ifdef CONFIG_DEBUG_PLUGINS + plugin_info = dlsym(handle, "plugin_author"); + if ((error = dlerror()) == NULL) + printf("Plugin %s author: %s\n", plugin_name, *plugin_info); + plugin_info = dlsym(handle, "plugin_license"); + if ((error = dlerror()) == NULL) + printf("Plugin %s license: %s\n", plugin_name, *plugin_info); + plugin_info = dlsym(handle, "plugin_description"); + if ((error = dlerror()) == NULL) + printf("Plugin %s descr.: %s\n", plugin_name, *plugin_info); +#endif + p = malloc(sizeof(plugin_t)); + p->next = plugins; + p->name = plugin_name; + plugins = p; + + deps = dlsym(handle, "plugin_deps"); + if ((error = dlerror()) != NULL) + deps = NULL; + + + strncpy(path, "plugin_", PATHSIZE); + strncat(path, plugin_name, PATHSIZE); + strncat(path, "_init", PATHSIZE); + + init_plugin = dlsym(handle, path); + if ((error = dlerror()) != NULL) { + printf("error: %s\n", error); + exit(1); + } + + if (deps) { + int i = 0; + char *walk = deps[0]; +#ifdef CONFIG_DEBUG_PLUGINS + printf("\nPlugin %s dependencies:", plugin_name); +#endif + while (walk) { + printf(" %s", walk); + if (!is_loaded(walk)) { +#ifdef CONFIG_DEBUG_PLUGINS + printf("(loading)\n"); +#endif + load_plugin(walk); + } +#ifdef CONFIG_DEBUG_PLUGINS + else { + printf("(loaded)"); + } +#endif + walk = deps[++i]; + } + } + + printf("\n"); +#if DEBUG + printf("Initializing module:\n"); +#endif + + return init_plugin(); + + // We don't dlclose the handle here since + // we want to keep our symbols for later use. +} |