head.S - KupOS kernel header | D A T A

/src/arch/x86_64/boot16/head.S

https://github.com/himikof/yallos · Assembly · 401 lines · 144 code · 86 blank · 171 comment · 0 complexity · 49449c3a367e2e570522510759342a99 MD5 · raw file

/*

; KupOS kernel header               |

;-----------------------------------+

*/

.intel_syntax noprefix

.include "macro.inc"

.include "define.inc"



.org GDT_IDT

.code16



.section .gdt, "a"



/*

;------------------------------------------------+

;                   D A T A                      |

;------------------------------------------------+

*/





ENTRY GDT



	null_desc:		.quad	0



	code_descr:		.byte	0xFF, 0xFF, 0x00, 0x00, 0x00, 0b10011010, 0b11001111 , 0x00

	data_descr:		.byte	0xFF, 0xFF, 0x00, 0x00, 0x00, 0b10010010, 0b11001111 , 0x00

	video_descr:	.byte	0xFF, 0xFF, 0x00, 0x80, 0x0b, 0b10010010, 0b11001111 , 0x00

	stack_descr:	.byte	0xFF, 0xFF, 0xf0, 0xff, 0x3e, 0b10010010, 0b01001111 , 0x00



	.fill	8*256 - (. - GDT)



GDT_sz = . - GDT - 1



/*;--------------------------------134 */



.section .idt, "aw"



ENTRY IDT



	trap_int		=	0b1000111100000000

	default_int		=	0b1000111000000000

	cs_seg			=	0x08



/*

	;------------;

	; Exceptions ;

	;------------;



	There they were...



*/



/*

	;------;

	; IRQs ;

	;------;

*/



/*	dwIDT int_20h, cs_seg, default_int



	dwIDT int_21h, cs_seg, default_int



	.rept 4

		dwIDT IRQ1_end, cs_seg, default_int

	.endr



	dwIDT int_26h, cs_seg, default_int



	dwIDT IRQ1_end, cs_seg, default_int



	.rept 8

		dwIDT IRQ2_end, cs_seg, default_int

	.endr

*/

/*

	;-------------;

	; KERNEL INTs ;

	;-------------;

*/



/*	dwIDT int_30h, cs_seg, default_int	*/	   /* OUTPUT */

/*	dwIDT int_31h, cs_seg, default_int	*/	   /* INPUT */

/*	dwIDT int_32h, cs_seg, default_int	*/	   /* FLOPPY */

/*	dwIDT int_33h, cs_seg, default_int	*/	   /* MEMORY */



	.fill	8*256 - (. - IDT)



IDT_sz = . - IDT - 1



/*

;---------------------------------------------------------------------------;

;           H E A D                            S T A R T                    ;

;---------------------------------------------------------------------------;

*/



.section .text.head, "ax"





/* .org OS_HEAD */

ENTRY	boot_entry16



/*

	;--------------------------------------------------------;

	;            P r o t e c t e d   M o d e                 ;

	;--------------------------------------------------------;

*/



	cli



	in  al, 0x70

	jmp .+2

	or  al, 0x80	  /* cli NMI */

	out 0x70, al

	jmp .+2



	in  al, 0x92

	jmp .+2

	or  al, 2	  /* A20 - available */

	out 0x92, al

	jmp .+2



	/* rePrograming controlers */



	mov al, 0x11

	out 0x20, al

	jmp .+2

	out 0xA0, al

	jmp .+2



	mov al, 0x20

	out 0x21, al

	jmp .+2

	mov al, 0x28

	out 0xA1, al

	jmp .+2



	mov al, 4

	out 0x21, al

	jmp .+2

	mov al, 2

	out 0xA1, al

	jmp .+2



	mov al, 1

	out 0x21, al

	jmp .+2

	out 0xA1, al

	jmp .+2



	mov al, -1

	out 0x21, al

	jmp .+2

	out 0xA1, al

	jmp .+2



	lgdt [GDTR]

	lidt [IDTR]



	mov eax, cr0

	or  al, 1

	mov cr0, eax



	jmp 8:offset prot_mode



prot_mode:



.code32



	mov eax, 0b10000

	mov ds, ax

	mov es, ax



	mov eax, 0b11000

	mov gs, ax



	lss esp, [_SYS_STACK]



/*

	;-------------------------------------------+

	;      C O P Y      M A I N                 |

	;-------------------------------------------+

*/



/*

	.comm _end, 4

	.comm _system_text, 4



	mov esi, _main_com_

	mov edi, _system_text						/*  memory 0x03000 - 0x13000 (64kb)  = memory for floppy DMA *//*

	mov ecx, (_end - _system_text) / 4

	rep movsd									/* main is 0x13000 and we copy it there *//*

*/



/*

	;-------------------------------------------+

	;     P a g i n g - ;-((((((((((((((((((((  |

	;-------------------------------------------+

*/



	mov eax, 0x1407

	mov ecx, 1023			/* Catalog */

	xor edi, edi

	stosd

	add eax, 0x3ff000

						    /* of */

  .fill_catalog:

	stosd				    /* Tables of Pages */

	add eax, 0x1000

	loop .fill_catalog



	xor eax, eax

	mov al, 0x07

	mov ecx, 1024

						    /* Fill */

    .fill:				    /* table */

	stosd				    /* of */

	add eax, 0x1000		    /* Pages 1 */

	loop .fill



	lea edi, [eax-7]

	mov ecx, 1024*1023	   /* Fill */



    .fill2:				   /* tables */

	stosd				   /* of */

	add eax, 0x1000		   /* Pages 2-1024 */

	loop .fill2



	/* -- stop filling -- */



	xor eax, eax

	mov cr3, eax



	mov eax, cr0

	bts eax, 0x1f		  /* and now setup paging =))) fuf */

	mov cr0, eax



/*

	;-------------------------------------------+

	;         I n t e r r u p t i o n  =)       |

	;-------------------------------------------+

*/



/*	mov byte [num_in_key_buf], 0 */	/* for keyboard */



	xor al, al

	out 0x21, al

	jmp .+2			/* controlers sti */

	out 0xA1, al

	jmp .+2



	in  al, 0x70

	jmp .+2

	and al, 0x7f	/* NMI sti */

	out 0x70, al

	jmp .+2



	call fill_idt



	/*sti*/									/* It's not safe yet */



/*

	;--------------------------------+

	;   Set form of cursor           |					why here?

	;--------------------------------+

*/



	mov dx, 0x03d4

	mov ax, 0x000A	     /* Select reg #10   and     reg #10  <- 0 (Low line of cursor) */

	out dx, ax

	jmp .+2



	mov ax, 0x0D0B	     /* Select reg #11   and     reg #11  <- 13 (High line of cursor) */

	out dx, ax

	jmp .+2



	.comm _kernel_main, 4

	jmp _kernel_main		/* should never return */



fill_idt:

	mov ecx, 0x100

	mov ebx, offset IDT

	mov edx, offset ignore_interrupt



	mov eax, 0x00080000

	mov ax, dx

	mov dx, 0x008E



	1:

	mov dword ptr [ebx], eax

	mov dword ptr [ebx+4], edx

	add ebx, 8



	loop 1b

	ret



ignore_interrupt:			/* dummy handler */

	iret



/*

	;-----------------------------------------------+

	;            DATA                               |

	;-----------------------------------------------+

*/



.section .initdata, "a"



	GDTR:		.word	GDT_sz

			.long	GDT



	IDTR:		.word	IDT_sz

			.long	IDT



	_SYS_STACK:	.long	SYS_STACK_ESP

			.word	0b100000



	/*------------------------------------------*/





/*.section .buffer, "a"

		.org	MAIN_COMMANDS*/



/*	.include "main.S" */









/*

									    E N D   O F   H E A D

*/







/*		OLD   STRUCTURES      */



/*

	;-------------------------------------------------------------------------------------------------------------------+

	;        IRQ - Timer, Key etc                                                                                       |

	;-------------------------------------------------------------------------------------------------------------------+

*/

/*	IRQ1_end:		/* exit IRQ interruption *//*

		push eax

		mov al, 0x20

		out 0x20, al

		jmp .+2

		pop eax

		iret



	IRQ2_end:		/* exit IRQ interruption *//*

		push eax

		mov al, 0x20

		out 0xA0, al

		jmp .+2

		pop eax

		iret

*/



/*

	;------------------+

	; IRQ0 - Timer     |

	;------------------+

*/

	/*.include "IRQ0.S"*/

/*

	;------------------+

	; IRQ1 - Keyboard  |

	;------------------+

*/

	/*.include "IRQ1.S"*/

/*

	;---------------+

	; IRQ6 - Floppy |

	;---------------+

*/

	/*.include "IRQ6.S"*/

/*

	;-------------------------------------------------------------------------------------------------------------------+

	;        INT 30h - OUTPUT TO CONSOLE                                                                                |

	;-------------------------------------------------------------------------------------------------------------------+

*/

	/*.include "OUTPUT.S"*/

/*

	;-------------------------------------------------------------------------------------------------------------------+

	;        INT 31h - INPUT TO CONSOLE                                                                                 |

	;-------------------------------------------------------------------------------------------------------------------+

*/

	/*.include "INPUT.S"*/

/*

	;-------------------------------------------------------------------------------------------------------------------+

	;        INT 32h - F L O P P Y                                                                                      |

	;-------------------------------------------------------------------------------------------------------------------+

*/

	/*.include "FLOPPY.S"*/

/*

	;-------------------------------------------------------------------------------------------------------------------+

	;        INT 33h - MEMORY                                                                                           |

	;-------------------------------------------------------------------------------------------------------------------+

*/

	/*.include "MEMORY.S"*/





/*	.long 0	*/			 /* align for copy by dword */