started on isr/idt stuff

2026-06-11 23:23:39 -05:00
parent eb1e096bac
commit 5e823e570b
5 changed files with 186 additions and 0 deletions
--- a/kernel/idt_stubs.s
+++ b/kernel/idt_stubs.s
@@ -0,0 +1,54 @@
+.code32 
+
+.macro ISR_NOERRCODE num
+.global isr\num
+isr\num:
+    pushl $0           
+    pushl $\num        
+    jmp isr_common_stub
+.endm
+
+.macro ISR_ERRCODE num
+.global isr\num
+isr\num:
+    pushl $\num       
+    jmp isr_common_stub
+.endm
+
+.extern common_interrupt_handler
+isr_common_stub:
+    pushal             
+
+    pushl %esp         
+    call common_interrupt_handler
+    addl $4, %esp      
+
+    popal              
+    addl $8, %esp      
+    iret            
+
+.global master_eoi
+master_eoi:
+    movb $0x20, %al
+    outb %al, $0x20
+    ret
+
+.extern idtr
+.global load_idt
+load_idt:
+    lidt idtr 
+    ret
+
+.global enable_int
+enable_int:
+    sti
+    ret
+
+ISR_NOERRCODE 0    # Divide by Zero
+ISR_NOERRCODE 1    # Debug
+ISR_ERRCODE   8    # Double Fault (Has Error Code!)
+ISR_ERRCODE   13   # General Protection Fault (Has Error Code!)
+ISR_ERRCODE   14   # Page Fault (Has Error Code!)
+
+ISR_NOERRCODE 32   # IRQ0 - Timer
+ISR_NOERRCODE 33   # IRQ1 - Keyboard