call.asm

Jazmyn is a 32-bit, protected mode, multitasking OS which runs on i386 & above CPU`s. Its complete

[bits 32]
[global start]
[extern _main]

%define KERNEL_CS_SEL   0x8
%define KERNEL_DS_SEL   0x10
%define IDT_SEL         0x20
%define KERNEL_STK_TOP  0x9ffff


%macro SETIDT 0                                 ;no arguments
        mov     word [es:edi],ax                ;offset in target segment 15...0
        shr     eax,16                          ;get the high word
        mov     word [es:edi+6],ax              ;offset in target segment 31...16
        mov     word [es:edi+2],KERNEL_CS_SEL   ;target segment selector: kernel cs
        mov     word [es:edi+4],0xee00          ;P|DPL3|i386 intr_gate
        add     edi,8                           ;each gate descriptor is 8 bytes
%endmacro

%macro MASK 2                                   ;%1->IRQ line , %2 intr controller->0x21 | 0xA1
        in      al,%2
        or      al,(1<<%1)                      ;set the mask bit
        out     %2,al
%endmacro

%macro UNMASK 2                                 ;%1->IRQ line , %2 intr controller->0x21 | 0xA1
        in      al,%2
        and     al,(~(1<<%1))                   ;clear the mask bit
        out     %2,al
%endmacro

%macro ACK_MASTER 0                            ;acknowledge the pic
        mov     al,0x20                         ;Non-specific EOI
        out     0x20,al
%endmacro

%macro  ACK_SLAVE 0
        mov     al,0x20
        out     0xA0,al
%endmacro

%macro SAVE_ALL 0
        push    ds
        push    es
        push    fs
        push    gs
        pushad

        mov     ax,KERNEL_DS_SEL
        mov     ds,ax
        mov     es,ax
        mov     fs,ax
        mov     gs,ax
%endmacro

%macro RESTORE_ALL 0
        popad
        pop     gs
        pop     fs
        pop     es
        pop     ds
%endmacro

jmp start

idtr:      dw 7ffh                              ;IDT limit
           dd 00001000h                         ;IDT base

ISR0:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR1:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR2:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR3:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR4:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR5:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR6:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR7:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR8:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR9:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR10:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR11:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR12:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR13:
        SAVE_ALL

        jmp 0x38:0x0000


        RESTORE_ALL
        iretd

ISR14:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR15:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR16:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR17:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR18:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR19:
        SAVE_ALL
        RESTORE_ALL        
        iretd

ISR20:
        SAVE_ALL
        RESTORE_ALL        
        iretd
        
ISR21:
        SAVE_ALL
        RESTORE_ALL        
        iretd

ISR22:
        SAVE_ALL
        RESTORE_ALL        
        iretd

ISR23:
        SAVE_ALL
        RESTORE_ALL        
        iretd

ISR24:                                          ;timer
        SAVE_ALL
        RESTORE_ALL
        iretd
                                                ;keyboard
ISR25:
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR26:                                          ;slave pic
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR27:                                          ;COM2 or COM4
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR28:                                          ;COM1 or COM3
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR29:                                          ;LPT2
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR30:                                          ;floppy disk
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR31:                                          ;LPT1
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR32:                                          ;real time clock
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR33:                                          ;software redirected to IRQ2
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR34:                                          ;reserved
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR35:                                          ;reserved
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR36:                                          ;mouse interrupt
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR37:                                          ;numeric coprocessor
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR38:                                          ;fixed disk controller
        SAVE_ALL
        RESTORE_ALL
        iretd

ISR39:                                          ;reserved
        SAVE_ALL
        RESTORE_ALL
        iretd

SYS_CALL:                                       ;reserved
        SAVE_ALL
        RESTORE_ALL
        iretd

UNHANDLED_INTR:
        SAVE_ALL
        RESTORE_ALL
        iretd

start:
        mov     ax,KERNEL_DS_SEL                ;set kernel segment regs
        mov     ss,ax
        mov     ds,ax
        mov     fs,ax
        mov     gs,ax
        mov     esp,KERNEL_STK_TOP              ;set kernel stack

        mov     ax,IDT_SEL                      ;initialize IDT
        mov     es,ax                           ;es:edi : base of IDT
        xor     edi,edi

        mov     eax,ISR0                        ;make physical addrs
        SETIDT
        mov     eax,ISR1
        SETIDT
        mov     eax,ISR2
        SETIDT
        mov     eax,ISR3
        SETIDT
        mov     eax,ISR4
        SETIDT
        mov     eax,ISR5
        SETIDT
        mov     eax,ISR6
        SETIDT
        mov     eax,ISR7
        SETIDT
        mov     eax,ISR8
        SETIDT
        mov     eax,ISR9
        SETIDT
        mov     eax,ISR10
        SETIDT
        mov     eax,ISR11
        SETIDT
        mov     eax,ISR12
        SETIDT
        mov     eax,ISR13
        SETIDT
        mov     eax,ISR14
        SETIDT
        mov     eax,ISR15
        SETIDT
        mov     eax,ISR16
        SETIDT
        mov     eax,ISR17
        SETIDT
        mov     eax,ISR18
        SETIDT
        mov     eax,ISR19
        SETIDT
        mov     eax,ISR20
        SETIDT
        mov     eax,ISR21
        SETIDT
        mov     eax,ISR22
        SETIDT
        mov     eax,ISR23
        SETIDT
        mov     eax,ISR24
        SETIDT
        mov     eax,ISR25
        SETIDT
        mov     eax,ISR26
        SETIDT
        mov     eax,ISR27
        SETIDT
        mov     eax,ISR28
        SETIDT
        mov     eax,ISR29
        SETIDT
        mov     eax,ISR30
        SETIDT
        mov     eax,ISR31
        SETIDT
        mov     eax,ISR32
        SETIDT
        mov     eax,ISR33
        SETIDT
        mov     eax,ISR34
        SETIDT
        mov     eax,ISR35
        SETIDT
        mov     eax,ISR36
        SETIDT
        mov     eax,ISR37
        SETIDT
        mov     eax,ISR38
        SETIDT
        mov     eax,ISR39
        SETIDT
        mov     eax,SYS_CALL
        SETIDT

        mov     cx,215
loc1:   mov     eax,UNHANDLED_INTR
        SETIDT
        dec     cx
        cmp     cx,0
        jne     loc1

        mov     ax,KERNEL_DS_SEL
        mov     es,ax

        lidt    [idtr]                          ;load IDTR
        sti

        call _main                              ;call kernel main

        jmp $