initgraph, whole lot of refactor

core/console.c

@@ -1,45 +1,44 @@
-#include <zinnia/cmdline.h>
 #include <zinnia/console.h>
+#include <zinnia/init.h>
 #include <zinnia/print.h>
-#include <zinnia/string.h>
+#include <zinnia/spin.h>
 
-extern struct console* const __ld_console_start[];
-extern struct console* const __ld_console_end[];
-
-struct console* active = nullptr;
+static struct console* registered = nullptr;
+static struct spinlock console_lock;
 
 void console_write(const char* buf, size_t len) {
-    if (__likely(active))
-        active->write(active, buf, len);
+    spin_lock(&console_lock);
+    for (struct console* con = registered; con; con = con->next)
+        con->write(con, buf, len);
+    spin_unlock(&console_lock);
 }
 
-static void console_setup(const char* value) {
-    if (!value)
-        return;
+bool console_register(struct console* con) {
+    if (!con->init(con))
+        return false;
 
-    // Find a suitable boot console.
-    struct console* const* cur = __ld_console_start;
-    while (cur < __ld_console_end) {
-        if (!strcmp(value, (*cur)->name)) {
-            active = *cur;
+    spin_lock(&console_lock);
+    con->next = registered;
+    registered = con;
+    spin_unlock(&console_lock);
+
+    log("console: Registered console \"%s\"\n", con->name);
+    return true;
+}
+
+void console_unregister(struct console* con) {
+    spin_lock(&console_lock);
+    for (struct console** link = &registered; *link; link = &(*link)->next) {
+        if (*link == con) {
+            *link = con->next;
+            break;
         }
-        cur++;
     }
+    spin_unlock(&console_lock);
 }
 
-CMDLINE_OPTION("console", "Set a default console", console_setup);
-
-void console_init() {
-    // If we have no console set and at least one set, use that as a default.
-    if (!active && &__ld_console_start[0] != &__ld_console_end[0])
-        active = __ld_console_start[0];
-
-    if (active) {
-        if (active->init(active) == false) {
-            active = nullptr;
-            return;
-        }
-
-        log("console: Logging on console \"%s\"\n", active->name);
-    }
+[[__init]]
+static void console_stage_init(struct boot_info*) {
+    kprintf("\ec");
 }
+INIT_TASK(console_stage, "core.console", console_stage_init);