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/* 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.
}
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