Added interrupts and PIT.

Author: AvihooI

.vscode/settings.json

@@ -3,6 +3,7 @@
         "terminal.h": "c",
         "idt.h": "c",
         "gdt.h": "c",
-        "types.h": "c"
+        "types.h": "c",
+        "irq.h": "c"
     }
 }

Makefile

@@ -9,10 +9,14 @@
 TARGET := testos.bin
 ALL_OBJ := environment.o \
 		boot.o \
+		_io.o \
 		kernel.o \
 		string.o \
 		idt.o \
-		_idt.o
+		_idt.o \
+		irq.o \
+		_irq.o \
+		pit.o
 ALL_DEP := $(patsubst %.o,.%.d,$(ALL_OBJ))
 
 #Assembly configuration

_io.asm

@@ -0,0 +1,15 @@
+section .text
+
+global outb
+outb:
+    mov edx, [esp+4]
+    mov eax, [esp+8]
+    out dx, al 
+    ret
+
+global inb
+inb:
+    mov edx, [esp+4]
+    xor eax, eax
+    in al, dx
+    ret

_irq.asm

@@ -0,0 +1,138 @@
+section .text
+
+global _irq_0
+global _irq_1
+global _irq_2
+global _irq_3
+global _irq_4
+global _irq_5
+global _irq_6
+global _irq_7
+global _irq_8
+global _irq_9
+global _irq_10
+global _irq_11
+global _irq_12
+global _irq_13
+global _irq_14
+global _irq_15
+
+_irq_0:
+    cli
+    push byte 0
+    push byte 32
+    jmp _irq_common
+
+_irq_1:
+    cli
+    push byte 0
+    push byte 33
+    jmp _irq_common
+
+_irq_2:
+    cli
+    push byte 0
+    push byte 34
+    jmp _irq_common
+
+_irq_3:
+    cli
+    push byte 0
+    push byte 35
+    jmp _irq_common
+
+_irq_4:
+    cli
+    push byte 0
+    push byte 36
+    jmp _irq_common
+
+_irq_5:
+    cli
+    push byte 0
+    push byte 37
+    jmp _irq_common
+
+_irq_6:
+    cli
+    push byte 0
+    push byte 38
+    jmp _irq_common
+
+_irq_7:
+    cli
+    push byte 0
+    push byte 39
+    jmp _irq_common
+
+_irq_8:
+    cli
+    push byte 0
+    push byte 40
+    jmp _irq_common
+
+_irq_9:
+    cli
+    push byte 0
+    push byte 41
+    jmp _irq_common
+
+_irq_10:
+    cli
+    push byte 0
+    push byte 42
+    jmp _irq_common
+
+_irq_11:
+    cli
+    push byte 0
+    push byte 43
+    jmp _irq_common
+
+_irq_12:
+    cli
+    push byte 0
+    push byte 44
+    jmp _irq_common
+
+_irq_13:
+    cli
+    push byte 0
+    push byte 45
+    jmp _irq_common
+
+_irq_14:
+    cli
+    push byte 0
+    push byte 46
+    jmp _irq_common
+
+_irq_15:
+    cli
+    push byte 0
+    push byte 47
+    jmp _irq_common
+
+_irq_common:
+    pusha
+    push ds
+    push es
+    push fs
+    push gs
+    mov ax, 0x10 ;Load ring-0 DS selector
+    mov ds, ax
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+    mov eax, esp ;Push the stack
+    push eax
+    extern irq_main_handler
+    call irq_main_handler
+    pop eax
+    pop gs
+    pop fs
+    pop es
+    pop ds
+    popa
+    add esp, 8 ;cleans the pushed error code and pushed isr number
+    iret ;pops CS, EIP, EFLAGS, SS and ESP