;; ----------------------------------------------------------------------- ;; ;; Copyright 1994-2006 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., 53 Temple Place Ste 330, ;; Boston MA 02111-1307, USA; either version 2 of the License, or ;; (at your option) any later version; incorporated herein by reference. ;; ;; ----------------------------------------------------------------------- ;; ;; bootsect.inc ;; ;; Load a boot sector (or other bootstrap program.) ;; ;; Unlike previous versions of this software, this doesn't require that ;; the length is 512 bytes. This allows PXE bootstraps and WinNT ;; "CD boot sectors" to be invoked. ;; ; ; Load a boot sector ; is_bootsector: %if IS_SYSLINUX || IS_MDSLINUX ; Transfer zero bytes mov byte [CopySuper],0 jmp short load_bootsec is_bss_sector: ; Transfer the superblock mov byte [CopySuper],superblock_len %endif load_bootsec: xchg dx,ax shl eax,16 xchg dx,ax ; Now EAX = file length mov edi, 100000h mov [trackbuf+4],edi ; Copy from this address push edi ; Save load address xor dx,dx ; No padding mov bx,abort_check ; Don't print dots, but allow abort call load_high sub edi,100000h mov [trackbuf+8],edi ; Save length mov eax,7C00h ; Entry point mov [trackbuf],eax ; Copy to this address mov [EntryPoint],eax ; Jump to this address when done %if IS_SYSLINUX || IS_MDSLINUX movzx ecx,byte [CopySuper] jcxz .not_bss ; For a BSS boot sector we have to patch. mov esi,superblock mov edi,100000h+(superblock-bootsec) call bcopy .not_bss: %endif xor edx,edx xor esi,esi %if IS_SYSLINUX || IS_MDSLINUX || IS_EXTLINUX ; Restore original FDC table mov eax,[OrigFDCTabPtr] mov [fdctab],eax mov dl,[DriveNumber] mov si,PartInfo ; Partition info buffer mov di,800h-18 ; Put partition info here push di mov cx,8 ; 16 bytes xor ax,ax rep movsw pop si ; DS:SI points to partition info %elif IS_ISOLINUX mov dl,[DriveNumber] %elif IS_PXELINUX mov byte [KeepPXE],1 ; Chainloading another NBP call reset_pxe %endif xor bx,bx ; ; replace_bootstrap for the special case where we have exactly one ; descriptor, and it's the first entry in the trackbuf ; replace_bootstrap_one: push word 1 ; Length of descriptor list push word trackbuf ; Address of descriptor list ; Fall through ; ; Entrypoint for "shut down and replace bootstrap" -- also invoked by ; the COMBOOT API. This routine expects two words on the stack: ; address of the copy list (versus DS) and count. Additionally, ; the values of ESI and EDX are passed on to the new bootstrap; ; the value of BX becomes the new DS. ; replace_bootstrap: ; ; Prepare for shutting down ; call vgaclearmode call cleanup_hardware ; ; Set up initial stack frame (not used by PXE if keeppxe is ; set - we use the PXE stack then.) ; AFTER THIS POINT ONLY .earlybss IS AVAILABLE, NOT .bss ; xor ax,ax mov ds,ax mov es,ax %if IS_PXELINUX test byte [KeepPXE],01h jz .stdstack les di,[InitStack] ; Reset stack to PXE original jmp .stackok %endif .stdstack: mov di,7C00h-44 push di mov cx,22 ; 44 bytes rep stosw pop di .stackok: mov [es:di+28],edx ; New EDX mov [es:di+12],esi ; New ESI mov [es:di+6],bx ; New DS %if IS_PXELINUX == 0 ; DON'T DO THIS FOR PXELINUX... ; For PXE, ES:BX -> PXENV+, and this would corrupt ; that use. ; Restore ES:DI -> $PnP (if we were ourselves called ; that way...) mov ax,[OrigESDI] mov bx,[OrigESDI+2] mov [es:di+8],ax ; New DI mov [es:di+4],bx ; New ES %endif pop bx ; Copy from... pop ax ; Copy list count cli mov cx,es mov ss,cx movzx esp,di jmp shuffle_and_boot