Added isr.asm with 50 isr_%d labels defined, ready to call isr()

git-svn-id: svn://anubis/hos/trunk@62 5b3e749e-e535-0410-8002-a9bb6afbdfca

kernel/boot/isr.asm

@@ -0,0 +1,61 @@
+
+; C ISR routine
+[extern isr]
+
+; Macro for creating a single ISR label
+; We need to push a junk value on the stack first
+; if the interrupt number is not 8 or 10-14.
+; This is to properly align the stack for both exceptions
+; having and not having error codes.
+%macro isr_label 1
+[global isr_%1]
+isr_%1:
+    %if ( (%1 != 8) && (%1 < 10 || %1 > 14) )
+        push    eax                 ; junk value to take error code stack space
+    %endif
+    push    eax
+    mov     al, %1                  ; save interrupt number in al
+    jmp     isr_common
+%endmacro
+
+; Loop to create all of our ISR labels
+%assign i 0
+%rep 50
+    isr_label i
+    %assign i i+1
+%endrep
+
+; The common ISR routine
+isr_common:
+    push    ebx
+    push    ecx
+    push    edx
+    push    edi
+    push    esi
+    push    ebp
+    push    ds
+    push    es
+    push    fs
+    push    gs
+
+    push    esp
+    push    eax
+; TODO: currently commented since there is no isr()
+; so the build will not break
+;    call    isr
+    add     esp, 8
+
+    pop     gs
+    pop     fs
+    pop     es
+    pop     ds
+    pop     ebp
+    pop     esi
+    pop     edi
+    pop     edx
+    pop     ecx
+    pop     ebx
+    pop     eax                     ; error code can be ignored now
+    pop     eax
+
+    iret