got some of the pty actually working in userspace

kernel/kmain.c

@@ -20,6 +20,7 @@
 #include <drivers/pit/pit.h>
 #include <drivers/vga/vga.h>
 #include <drivers/cpio/cpio.h>
+#include <drivers/devfs/devfs.h>
 
 #include <stddef.h>
 #include <stdint.h>
@@ -65,6 +66,10 @@ void load_root_program(const char* path) {
   flush_tlb();
 
   uint32_t eip = load_elf_program(path);
+  if (eip == 0) {
+    kprintf("Failed to load elf program file\n");
+    return;
+  }
 
   uint32_t stack_sz = PAGE_SIZE * 16;
   uint32_t stack_top = 0xBFFF0000;
@@ -122,12 +127,26 @@ void kmain(uint32_t magic, multiboot_info* mbi)  {
   vfs_mount(vfs_root, initrd_root);
   kprintf("initrd read, mounted @ /\n");
 
+  vfs_node_t* devfs = create_devfs();
+  if (!devfs) {
+    kprintf("failed to create devfs\n");
+    return;
+  }
+
+  vfs_node_t* vga_dev = devfs->create(devfs, "tvga");
+  vga_dev->write = vga_write;
+
+  vfs_node_t* dev = vfs_find("/dev");
+  if (dev) {
+    dev->mnt = devfs;
+  }
+
   disable_interrupts();
   init_scheduler();
   enable_interrupts();
 
   kprintf("loading terminal program\n");
-  load_root_program("/vga_text_term.elf");
+  load_root_program("/bin/vga_text_term.elf");
 
   kprintf("kernel going to sleep...\n");
 }