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https://gitlab.com/qemu-project/openbios.git
synced 2024-02-13 08:34:06 +08:00
initial import of openbios--main--1.0--patch-26
git-svn-id: svn://coreboot.org/openbios/openbios-devel@1 f158a5a8-5612-0410-a976-696ce0be7e32
This commit is contained in:
Stefan Reinauer
209
arch/unix/plugins/loader.c
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209
arch/unix/plugins/loader.c
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@@ -0,0 +1,209 @@
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/* tag: openbios plugin loader
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*
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* Copyright (C) 2003 Stefan Reinauer
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*
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* See the file "COPYING" for further information about
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* the copyright and warranty status of this work.
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*/
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/* This is a simple plugin loader. OpenBIOS duplicates some
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* of this code in kernel/arch/unix/plugins.c. This code is
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* here for reference and simple testing.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dlfcn.h>
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#include <unistd.h> // sleep
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#include "unix/plugins.h"
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#define PLUGINDIR "/usr/share/OpenBIOS/plugins"
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#define PATHSIZE 256
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#define DEBUG_PLUGINS
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typedef struct iorange iorange_t;
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struct iorange {
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const char *name;
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unsigned int start;
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unsigned int end;
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io_ops_t *ops;
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iorange_t *next;
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};
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iorange_t *ioranges = NULL;
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typedef struct plugin plugin_t;
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struct plugin {
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const char *name;
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plugin_t *next;
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};
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plugin_t *plugins = NULL;
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int register_iorange(const char *name, io_ops_t * ops, unsigned int rstart,
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unsigned int rend)
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{
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iorange_t *newrange;
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/* intersection check */
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newrange = ioranges;
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while (newrange) {
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int fail = 0;
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/* new section swallows old section */
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if (newrange->start >= rstart && newrange->end <= rend)
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fail = -1;
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/* new section start or end point are within range */
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if (newrange->start <= rstart && newrange->end >= rstart)
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fail = -1;
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if (newrange->start <= rend && newrange->end >= rend)
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fail = -1;
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if (fail) {
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printf("Error: overlapping IO regions: %s and %s\n",
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newrange->name, name);
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return -1;
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}
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newrange = newrange->next;
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}
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newrange = malloc(sizeof(iorange_t));
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newrange->name = name;
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newrange->ops = ops;
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newrange->start = rstart;
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newrange->end = rend;
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newrange->next = ioranges;
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ioranges = newrange;
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return 0;
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}
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int is_loaded(const char *plugin_name)
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{
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plugin_t *p = plugins;
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while (p) {
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if (!strcmp(plugin_name, p->name))
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return -1;
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p = p->next;
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}
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return 0;
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}
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int load_plugin(const char *plugin_name)
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{
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void *handle;
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char *error;
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char path[PATHSIZE];
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int (*init_plugin) (void);
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char **deps;
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char **plugin_info;
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plugin_t *p;
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if (is_loaded(plugin_name)) {
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printf("Plugin %s already loaded.\n", plugin_name);
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return 0;
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}
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strncpy(path, PLUGINDIR, PATHSIZE);
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strncat(path, "/plugin_", PATHSIZE);
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strncat(path, plugin_name, PATHSIZE);
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strncat(path, ".so", PATHSIZE);
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#if DEBUG
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printf("Opening plugin %s\n", path);
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#endif
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handle = dlopen(path, RTLD_LAZY | RTLD_GLOBAL);
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if (!handle) {
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error = dlerror();
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printf("Error: Could not open plugin \"%s\": %s\n",
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plugin_name, error);
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exit(1);
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}
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#ifdef DEBUG_PLUGINS
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plugin_info = dlsym(handle, "plugin_author");
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if ((error = dlerror()) == NULL)
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printf("Plugin %s author: %s\n", plugin_name, *plugin_info);
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plugin_info = dlsym(handle, "plugin_license");
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if ((error = dlerror()) == NULL)
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printf("Plugin %s license: %s\n", plugin_name, *plugin_info);
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plugin_info = dlsym(handle, "plugin_description");
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if ((error = dlerror()) == NULL)
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printf("Plugin %s descr.: %s\n", plugin_name, *plugin_info);
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#endif
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p = malloc(sizeof(plugin_t));
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p->next = plugins;
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p->name = plugin_name;
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plugins = p;
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deps = dlsym(handle, "plugin_deps");
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if ((error = dlerror()) != NULL)
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deps = NULL;
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strncpy(path, "plugin_", PATHSIZE);
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strncat(path, plugin_name, PATHSIZE);
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strncat(path, "_init", PATHSIZE);
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init_plugin = dlsym(handle, path);
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if ((error = dlerror()) != NULL) {
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printf("error: %s\n", error);
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exit(1);
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}
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if (deps) {
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int i = 0;
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char *walk = deps[0];
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#ifdef DEBUG_PLUGINS
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printf("\nPlugin %s dependencies:", plugin_name);
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#endif
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while (walk) {
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printf(" %s", walk);
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if (!is_loaded(walk)) {
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#ifdef DEBUG_PLUGINS
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printf("(loading)\n");
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#endif
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load_plugin(walk);
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}
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#ifdef DEBUG_PLUGINS
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else {
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printf("(loaded)");
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}
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#endif
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walk = deps[++i];
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}
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}
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printf("\n");
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#if DEBUG
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printf("Initializing module:\n");
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#endif
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return init_plugin();
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// We don't dlclose the handle here since
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// we want to keep our symbols for later use.
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}
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int main(void)
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{
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iorange_t *r;
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// load_plugin("kbd");
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// load_plugin("pci");
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load_plugin("qt");
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printf("\nRegistered IO Ranges:\n");
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r = ioranges;
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while (r) {
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printf(" %s: %x-%x\n", r->name, r->start, r->end);
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r = r->next;
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}
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sleep(10);
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return 0;
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}
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