Jump from interrupt into rust code

rust_experiments/src/lib.rs

@@ -14,6 +14,10 @@ extern {
     fn call_interrupt();
 }
 
+#[no_mangle]
+pub extern fn rust_interrupt_handler() {
+    checkerboard(vga_buffer::Color::White);
+}
 
 #[no_mangle]
 pub extern fn rust_main() {

rust_experiments/src/long_mode_init.asm

@@ -2,6 +2,7 @@ global long_mode_start
 global asm_printchar
 global get_rdtsc
 global call_interrupt
+extern rust_interrupt_handler
 
 section .text
 bits 64
@@ -10,6 +11,7 @@ long_mode_start:
     ; print "OKAY"
     call setup_SSE
     call setup_IDT
+    call setup_PIC
     extern rust_main
     call rust_main
     ; rust main returned, print `OS returned!`
@@ -69,24 +71,47 @@ get_rdtsc:
     ret
 
 call_interrupt:
-    int 49
+    int 5
     ret
 
 sample_handler:
-    mov word [0xb8000], 0x4f72
+    ;mov word [0xb8000], 0x4f72
+    push rax
+    push rcx
+    push rdx
+    push r8
+    push r9
+    push r10
+    push r11
+
+    cld
+    call rust_interrupt_handler
+
+    pop r11
+    pop r10
+    pop r9
+    pop r8
+    pop rdx
+    pop rcx
+    pop rax
+
     call spin_loop_64
     iretq
 
+%define int_num 5
 setup_IDT:
     lidt [idt64.pointer]
     mov rax, sample_handler
-    mov [idt64 + 49*16], ax
-    mov word [idt64 + 49*16 +2], cs
-    mov word [idt64 + 49*16 + 4], 0x8e00
+    mov [idt64 + int_num*16], ax
+    mov word [idt64 + int_num*16 +2], cs
+    mov word [idt64 + int_num*16 + 4], 0x8e00
     shr rax, 16
-    mov [idt64 + 49*16 + 6], ax
+    mov [idt64 + int_num*16 + 6], ax
     shr rax, 16
-    mov [idt64 + 49*16 + 8], ax
+    mov [idt64 + int_num*16 + 8], ax
+    ret
+
+setup_PIC:
     ret
 
 idt64: