.code64

.extern printk
.extern apic_ack

.macro CALL_PRINTK msg
    mov \msg, %rdi
    mov $0, %eax # Required for variadic functions
    mov $printk,%rcx
    call *(%rcx)
.endm

.macro  SAVE_REGS
    push %r8
    push %r9
    push %r10
    push %r11
    push %r12
    push %r13
    push %r14
    push %r15
    push %rax
    push %rbx
    push %rcx
    push %rdx
    push %rbp
    push %rsi
    push %rdi
    xor %rax,%rax  # Because I am picky
    mov %gs, %rax
    push %rax
    mov %es, %rax
    push %rax
    mov %fs, %rax
    push %rax
    mov %ds, %rax
    push %rax
    mov $0x10, %ax
    mov %ax, %ds
    mov 80(%rsp), %rax
.endm

.macro RESTORE_REGS
    pop %rax
    mov %ax, %ds
    pop %rax
    mov %ax, %fs
    pop %rax
    mov %ax, %es
    pop %rax
    mov %ax, %gs
    pop %rdi    
    pop %rsi    
    pop %rbp    
    pop %rdx    
    pop %rcx    
    pop %rbx
    pop %rax
    pop %r15
    pop %r14
    pop %r13
    pop %r12
    pop %r11
    pop %r10
    pop %r9
    pop %r8
.endm

.globl INT_DEFAULT
INT_DEFAULT:
    SAVE_REGS
    RESTORE_REGS
    iretq

.globl INT_0
INT_0:
    CALL_PRINTK $MSG_INT_0
    INT_0_INFINITE:
    jmp INT_0_INFINITE
    iretq

.globl INT_10
INT_10:
    CALL_PRINTK $MSG_INT_10
    INT_10_INFINITE:
    jmp INT_10_INFINITE
    iretq

.globl INT_14
INT_14:
    pop %rsi
    CALL_PRINTK $MSG_INT_14
    INT_14_INFINITE:
    jmp INT_14_INFINITE
    iretq

.globl INT_KBD
INT_KBD:
    SAVE_REGS
    CALL_PRINTK $MSG_INT_KBD
    call apic_ack
    RESTORE_REGS
    iretq

.globl INT_CLK
.extern clock
INT_CLK:
    SAVE_REGS
    call clock
    call apic_ack
    RESTORE_REGS
    iretq

.globl INT_SYSCALL
.extern syscall
INT_SYSCALL:
    SAVE_REGS
    call syscall
    RESTORE_REGS
    iretq
  

MSG_INT_0:
.asciz "Zero Division error!"
MSG_INT_10:
.asciz "Invalid TSS!"
MSG_INT_14:
.asciz "Page fault: error %x !"
MSG_INT_KBD:
.asciz "Key press!"
MSG:
.asciz "Called :)\n"