Add multiboot2 rust lib

c.f. os.phil-opp.com/allocating-frames.html

rust_experiments/Cargo.toml

@@ -8,3 +8,7 @@ crate-type = ["staticlib"]
 
 [dependencies]
 rlibc = "*"
+
+[dependencies.multiboot2]
+git = "https://github.com/phil-opp/multiboot2-elf64"
+

rust_experiments/src/boot.asm

@@ -9,7 +9,7 @@ section .bss
     p3_table: resb 4096
     p2_table: resb 4096
 
-    stack_bottom: resb 64 ;reserve 64 bytes of stack space
+    stack_bottom: resb 4096 ;reserve 4096 bytes of stack space
     stack_top:
 
 section .text
@@ -17,6 +17,8 @@ bits 32
 
 start:
     mov esp, stack_top
+    mov edi, ebx ; move multiboot info pointer to edi
+
     call test_multiboot
     call test_cpuid
     call use_cpuid

rust_experiments/src/lib.rs

@@ -7,6 +7,7 @@
 extern crate std;
 
 extern crate rlibc;
+extern crate multiboot2;
 
 /* externs */
 #[no_mangle]
@@ -38,7 +39,7 @@ pub extern fn rust_handle_timer() {
     }
 
     //timer_callback(gtc);
-    timer_callback2(gtc);
+    //timer_callback2(gtc);
 }
 
 #[no_mangle]
@@ -176,10 +177,12 @@ fn timer_callback(count: u64) {
 }
 
 #[no_mangle]
-pub extern fn rust_main() {
+pub extern fn rust_main(multiboot_info_header: usize) {
     use vga_buffer::{clear, checkerboard, Color};
     clear();
-    //checkerboard(Color::Red);
+    checkerboard(Color::Red);
+
+    let boot_info = unsafe { multiboot2::load(multiboot_info_header) };
 
     loop {