feature: a lot of stuff and got to a working command line ish

kernel/kernel.c

@@ -1,6 +1,7 @@
 #include <drivers/ports.h>
 #include <drivers/vgascreen.h>
 #include <libc/libc.h>
+#include <libc/stdbool.h>
 #include <cpu/isr.h>
 #include <cpu/timer.h>
 #include <drivers/keyboard.h>
@@ -8,9 +9,12 @@
 #include <multiboot.h>
 #include <drivers/serial.h>
 #include <kprint.h>
+#include <libc/readline.h>
+#include <libc/string.h>
 
 char *msg_booted = "Booted Successfully!\n";
 
+void main_loop();
 
 void kmain(multiboot_info_t *multiboot_info) {
     isr_install();
@@ -37,9 +41,39 @@ void kmain(multiboot_info_t *multiboot_info) {
     init_timer(50);
     init_keyboard();
 
-    print_mmap_info();
+//    print_mmap_info();
+    while (true) {
+        main_loop();
+    }
 
 //    vga_set_raw(pos * 2, 'X');
 //    vga_set_raw(pos * 2 + 1, 0xf);
     do {} while (1);
 }
+
+const char* newline = "\n";
+const char* msg_unknown_command = "Unknown command: ";
+
+const char* cmd_echo = "echo";
+const char* cmd_print_mmap = "print_mmap";
+
+void main_loop() {
+    char* msg = readline(NULL);
+    char* args = strchr(msg, ' ') + 1;
+    args[-1] = 0;
+    if (strcmp(cmd_echo, msg) == 0) {
+        kprint(args);
+        kprint(newline);
+        goto _main_loop_end;
+    }
+    if (strcmp(cmd_print_mmap, msg) == 0) {
+        print_mmap_info();
+        goto _main_loop_end;
+    }
+
+    kprint(msg_unknown_command);
+    kprint(msg);
+    kprint(newline);
+_main_loop_end:
+    free(msg);
+}