Initial commit

kernel/core/console.c

@@ -0,0 +1,44 @@
+#include <kernel/cmdline.h>
+#include <kernel/console.h>
+#include <kernel/print.h>
+#include <kernel/syscalls.h>
+#include <string.h>
+
+extern struct console* const __ld_console_start[];
+extern struct console* const __ld_console_end[];
+
+struct console* active = nullptr;
+
+void console_write(const char* buf, size_t len) {
+    if (__likely(active))
+        active->write(active, buf, len);
+}
+
+static void console_setup(const char* value) {
+    if (!value)
+        return;
+
+    // Find a suitable boot console.
+    struct console* const* cur = __ld_console_start;
+    while (cur < __ld_console_end) {
+        if (!strcmp(value, (*cur)->name)) {
+            active = *cur;
+        }
+        cur++;
+    }
+}
+
+CMDLINE_OPTION("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;
+        else
+            kprintf("Logging on console \"%s\"\n", active->name);
+    }
+}