diff options
Diffstat (limited to 'contrib/syslinux-4.02/core/localboot.inc')
| -rw-r--r-- | contrib/syslinux-4.02/core/localboot.inc | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/core/localboot.inc b/contrib/syslinux-4.02/core/localboot.inc new file mode 100644 index 0000000..a66cf20 --- /dev/null +++ b/contrib/syslinux-4.02/core/localboot.inc @@ -0,0 +1,76 @@ +; ----------------------------------------------------------------------- +; +; 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 .text16 + +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 .data16 +localboot_msg db 'Booting from local disk...', CR, LF, 0 + + section .text16 + +%endif ; HAS_LOCALBOOT |