And call into c from assembly

baremetal_gamarjoba.asm

@@ -15,6 +15,8 @@ print_word db 'Hahaha',0
 section .text
 
 extern get_vram_offset
+extern c_entry
+global write_to_coord
 
 global boot
     mov esp, stack + stack_size ;stack is stack-size bytes higher than highest uninitialized memory
@@ -51,6 +53,8 @@ main:
     call write_to_coord
     add esp, 12
 
+    call c_entry
+
     jmp halt
 
 halt:

include.c

@@ -1,5 +1,12 @@
 
+extern int write_to_coord(int a, int b, int c);
 
 int get_vram_offset() {
     return 0xb8000;
 }
+
+
+void c_entry() {
+    int space = 0x26 | (0xf0 <<  8); //ascii ampersand white on black
+    write_to_coord(space,1,2);
+}