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Diffstat (limited to 'contrib/syslinux/latest/core/bootsect.inc')
| -rw-r--r-- | contrib/syslinux/latest/core/bootsect.inc | 237 |
1 files changed, 0 insertions, 237 deletions
diff --git a/contrib/syslinux/latest/core/bootsect.inc b/contrib/syslinux/latest/core/bootsect.inc deleted file mode 100644 index b4402f1..0000000 --- a/contrib/syslinux/latest/core/bootsect.inc +++ /dev/null @@ -1,237 +0,0 @@ -;; ----------------------------------------------------------------------- -;; -;; Copyright 1994-2009 H. Peter Anvin - All Rights Reserved -;; Copyright 2009 Intel Corporation; author: H. Peter Anvin -;; -;; 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 - ; Transfer zero bytes - push word 0 - jmp short load_bootsec - -is_bss_sector: - ; Transfer the superblock -SuperSize equ $+1 - push word superblock_len_fat16 -%endif -load_bootsec: - mov edi,free_high_memory - mov [trackbuf+4],edi ; Copy from this address - xor dx,dx ; No padding - mov bx,abort_check ; Don't print dots, but allow abort - call load_high - - sub edi,free_high_memory - mov [trackbuf+8],edi ; Save length - - mov eax,7C00h ; Entry point - mov [trackbuf],eax ; Copy to this address - -%if IS_SYSLINUX - xor ecx,ecx - pop cx - - ; For a BSS boot sector we have to patch. - mov esi,superblock - mov edi,free_high_memory+(superblock-bootsec) - call bcopy -%endif - push eax ; Save entry point - - xor edx,edx - xor esi,esi -%if IS_SYSLINUX || 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 - xor bx,bx -%elif IS_ISOLINUX - mov dl,[DriveNumber] - xor bx,bx -%elif IS_PXELINUX - mov byte [KeepPXE],03h ; Chainloading + keep PXE - pm_call reset_pxe - lfs si,[InitStack] - ; Put restore DS, EDX and ESI to the true initial values - mov bx,[fs:si+6] - mov edx,[fs:si+28] - mov esi,[fs:si+12] -%endif - -; -; replace_bootstrap for the special case where we have exactly one -; descriptor, based in low memory. We will generate a second descriptor -; to clear remaining FBM. -; - -replace_bootstrap_one: - mov eax,[trackbuf] ; Base address - add eax,[trackbuf+8] ; Length - movzx ecx,word [BIOS_fbm] - shl ecx,10 ; Free Base Memory - sub ecx,eax - mov [trackbuf+12],eax - or dword [trackbuf+16],-1 ; Zero memory - mov [trackbuf+20],ecx - push word 2 ; Length of descriptor list - ; Fall through - -; -; Entrypoint for "shut down and replace bootstrap" -- also invoked by -; the COMBOOT API. This routine expects the entry point (CS, IP) and the -; count of the descriptor sequence on the stack; the shuffle -; descriptors start at the first byte of the trackbuf. -; -; The registers EDX and ESI are passed on to the called program, -; and BX is passed on as DS. -; -replace_bootstrap: - ; - ; Prepare for shutting down - ; - call vgaclearmode - -; -; We jump here when loading a kernel image, so that we don't reset -; the screen mode in "quiet" mode -; -replace_bootstrap_noclearmode: - call cleanup_hardware - - ; - ; Set up initial stack frame (not used by PXE if keeppxe is - ; set - we use the PXE stack then.) - ; - xor ax,ax - mov ds,ax - mov es,ax - -%if IS_PXELINUX - cmp byte [KeepPXE],0 - je .stdstack - les di,[InitStack] ; Reset stack to PXE original - jmp .stackok -%endif -.stdstack: - ; StackBuf is guaranteed to have 44 bytes free immediately - ; above it, and it will not interfere with our existing stack. - mov di,StackBuf - 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 ax ; List length - - push di - push es - - push ds - pop es - - mov ebx,trackbuf - imul di,ax,12 - add di,bx ; DI <- end of list - push di - - ; Terminating entry... - lea eax,[replace_stub] ; Entrypoint - push ax - stosd - xor ax,ax ; EAX[31:16] == 0 already - stosd ; 16-bit mode - stosd ; End of list - - ; Copy the stub - pop di - mov si,__replacestub_lma - mov cx,__replacestub_dwords - rep movsd - - xor ecx,ecx - pop cx ; ECX <- length of list - - pop word [replace_stub.ss] - pop word [replace_stub.esp] - pop dword [replace_stub.csip] - - cli - mov ss,[replace_stub.ss] - mov esp,[replace_stub.esp] - - mov edi,trackbuf - mov esi,edi - - jmp shuffle_and_boot_raw - - ; This stub gets run after the shuffle. It is copied - ; below 0x7c00 in order to properly handle the case - ; of bootstrap replacement. - section .replacestub -replace_stub: - mov cr0,eax - jmp 0:.next -.next: - mov ax,strict word 0 -.ss equ $-2 - mov ss,ax - mov esp,strict dword 0 -.esp equ $-4 - pop gs - pop fs - pop es - pop ds - popad - popfd - jmp 0:0 -.csip equ $-4 - - section .text16 |