mkinitrd-6_3_1/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	niro	1133	; -----------------------------------------------------------------------
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