mkinitrd-magellan/isolinux/localboot.inc

; -----------------------------------------------------------------------
;
;   Copyright 1999-2008 H. Peter Anvin - All Rights Reserved
;
;   This program is free software; you can redistribute it and/or modify
;   it under the terms of the GNU General Public License as published by
;   the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
;   Boston MA 02110-1301, USA; either version 2 of the License, or
;   (at your option) any later version; incorporated herein by reference.
;
; -----------------------------------------------------------------------

;
; localboot.inc
;
; Boot from a local disk, or invoke INT 18h.
;

%if HAS_LOCALBOOT

;
; Boot a specified local disk.  AX specifies the BIOS disk number; or
; -1 in case we should execute INT 18h ("next device.")
;
		section .text

local_boot:
		call vgaclearmode
		RESET_STACK_AND_SEGS dx		; dx <- 0
		mov fs,dx
		mov gs,dx
		mov si,localboot_msg
		call writestr
		call cleanup_hardware
		cmp ax,-1
		je .int18

		; Load boot sector from the specified BIOS device and jump to it.
		mov dl,al
		xor dh,dh
		push dx
		xor ax,ax			; Reset drive
		int 13h
		mov ax,0201h			; Read one sector
		mov cx,0001h			; C/H/S = 0/0/1 (first sector)
		mov bx,trackbuf
		mov bp,retry_count
.again:
		pusha
		int 13h
		popa
		jnc .ok
		dec bp
		jnz .again
		jmp kaboom			; Failure...
.ok:
		pop dx
		cli				; Abandon hope, ye who enter here
		mov si,trackbuf
		mov di,07C00h
		mov cx,512			; Probably overkill, but should be safe
		rep movsd
		mov ss,cx			; SS <- 0
		mov sp,7C00h
		jmp 0:07C00h			; Jump to new boot sector

.int18:
		int 18h				; Hope this does the right thing...
		jmp kaboom			; If we returned, oh boy...

		section .data
localboot_msg	db 'Booting from local disk...', CR, LF, 0

		section .text

%endif ; HAS_LOCALBOOT
1	; -----------------------------------------------------------------------
2	;
3	; Copyright 1999-2008 H. Peter Anvin - All Rights Reserved
4	;
5	; This program is free software; you can redistribute it and/or modify
6	; it under the terms of the GNU General Public License as published by
7	; the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
8	; Boston MA 02110-1301, USA; either version 2 of the License, or
9	; (at your option) any later version; incorporated herein by reference.
10	;
11	; -----------------------------------------------------------------------
12
13	;
14	; localboot.inc
15	;
16	; Boot from a local disk, or invoke INT 18h.
17	;
18
19	%if HAS_LOCALBOOT
20
21	;
22	; Boot a specified local disk. AX specifies the BIOS disk number; or
23	; -1 in case we should execute INT 18h ("next device.")
24	;
25	section .text
26
27	local_boot:
28	call vgaclearmode
29	RESET_STACK_AND_SEGS dx ; dx <- 0
30	mov fs,dx
31	mov gs,dx
32	mov si,localboot_msg
33	call writestr
34	call cleanup_hardware
35	cmp ax,-1
36	je .int18
37
38	; Load boot sector from the specified BIOS device and jump to it.
39	mov dl,al
40	xor dh,dh
41	push dx
42	xor ax,ax ; Reset drive
43	int 13h
44	mov ax,0201h ; Read one sector
45	mov cx,0001h ; C/H/S = 0/0/1 (first sector)
46	mov bx,trackbuf
47	mov bp,retry_count
48	.again:
49	pusha
50	int 13h
51	popa
52	jnc .ok
53	dec bp
54	jnz .again
55	jmp kaboom ; Failure...
56	.ok:
57	pop dx
58	cli ; Abandon hope, ye who enter here
59	mov si,trackbuf
60	mov di,07C00h
61	mov cx,512 ; Probably overkill, but should be safe
62	rep movsd
63	mov ss,cx ; SS <- 0
64	mov sp,7C00h
65	jmp 0:07C00h ; Jump to new boot sector
66
67	.int18:
68	int 18h ; Hope this does the right thing...
69	jmp kaboom ; If we returned, oh boy...
70
71	section .data
72	localboot_msg db 'Booting from local disk...', CR, LF, 0
73
74	section .text
75
76	%endif ; HAS_LOCALBOOT