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Diffstat (limited to 'contrib/syslinux-4.02/core/parseconfig.inc')
| -rw-r--r-- | contrib/syslinux-4.02/core/parseconfig.inc | 475 |
1 files changed, 475 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/core/parseconfig.inc b/contrib/syslinux-4.02/core/parseconfig.inc new file mode 100644 index 0000000..e7b3108 --- /dev/null +++ b/contrib/syslinux-4.02/core/parseconfig.inc @@ -0,0 +1,475 @@ +;; ----------------------------------------------------------------------- +;; +;; 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. +;; +;; ----------------------------------------------------------------------- + +;; +;; parseconfig.inc +;; +;; Configuration file operations +;; + + section .text16 +; +; "default" or "ui" command, with level (1 = default, 2 = ui) +; +pc_default: cmp ax,[DefaultLevel] + jb skipline ; == call skipline + ret + mov [DefaultLevel],ax + mov di,default_cmd + call getline + mov byte [di-1],0 ; null-terminate + ret + +; +; "ontimeout" command +; +pc_ontimeout: mov di,Ontimeout + call getline + sub di,Ontimeout+1 ; Don't need final space + mov [OntimeoutLen],di + ret + +; +; "onerror" command +; +pc_onerror: mov di,Onerror + call getline + sub di,Onerror + mov [OnerrorLen],di + ret + +; +; "append" command +; +pc_append: cmp byte [VKernel],0 + ja .vk + mov di,AppendBuf + call getline + sub di,AppendBuf +.app1: mov [AppendLen],di + ret +.vk: mov di,VKernelBuf+vk_append ; "append" command (vkernel) + call getline + sub di,VKernelBuf+vk_append + cmp di,byte 2 + jne .app2 + cmp byte [VKernelBuf+vk_append],'-' + jne .app2 + xor di,di ; If "append -" -> null string +.app2: mov [VKernelBuf+vk_appendlen],di + ret + +; +; "ipappend" command (PXELINUX only) +; +%if IS_PXELINUX +pc_ipappend: call getint + jc .err + cmp byte [VKernel],0 + jne .vk + mov [IPAppend],bl +.err: ret +.vk: mov [VKernelBuf+vk_ipappend],bl + ret +%endif + +; +; "localboot" command +; +%if HAS_LOCALBOOT + +pc_localboot: call getint + cmp byte [VKernel],0 ; ("label" section only) + je .err + mov [VKernelBuf+vk_rname],bx + mov byte [VKernelBuf+vk_type],VK_LOCALBOOT +.err: ret + +%endif ; HAS_LOCALBOOT + +; +; "kernel", "config", ... command +; +pc_kernel: cmp byte [VKernel],0 + je .err ; ("label" section only) + mov [VKernelBuf+vk_type],al + call pc_getline + mov di,VKernelBuf+vk_rname + pm_call pm_mangle_name +.err: ret + +; +; "timeout", "totaltimeout" command +; +; N.B. 1/10 s ~ 1.D2162AABh clock ticks +; +pc_timeout: push ax + call getint + pop si + jc .err + mov eax,0D2162AABh + mul ebx ; clock ticks per 1/10 s + add ebx,edx + mov [si],ebx +.err: ret + + +; +; "totaltimeout" command +; +pc_totaltimeout: + +; +; Generic integer variable setting commands: +; "prompt", "implicit" +; +pc_setint16: + push ax + call getint + pop si + jc .err + mov [si],bx +.err: ret + +; +; Generic file-processing commands: +; "font", "kbdmap", +; +pc_filecmd: push ax ; Function to tailcall + call pc_getline + mov di,MNameBuf + pm_call pm_mangle_name + pm_call pm_searchdir + jnz .ok + pop ax ; Drop the successor function +.ok: ret ; Tailcall if OK, error return + +; +; Commands that expect the file to be opened on top of the getc stack. +; "display", "include" +; +pc_opencmd: push ax ; Function to tailcall + call pc_getline + mov di,MNameBuf + pm_call pm_mangle_name + call core_open + jnz .ok + pop ax ; Drop the successor function +.ok: ret ; Tailcall if OK, error return + +; +; "include" command (invoked from pc_opencmd) +; +pc_include: inc word [IncludeLevel] +.err: ret + +; +; "serial" command +; +pc_serial: call getint + jc .err + push bx ; Serial port # + xor eax,eax + mov [FlowControl],eax ; Default to no flow control + call skipspace + jc .nobaud + call ungetc + call getint + jc .nobaud +.valid_baud: + push ebx + call skipspace + jc .no_flow + call ungetc + call getint ; Hardware flow control? + jnc .valid_flow +.no_flow: + xor bx,bx ; Default -> no flow control +.valid_flow: + and bh,0Fh ; FlowIgnore + shl bh,4 + mov [FlowIgnore],bh + mov bh,bl + and bx,0F00Bh ; Valid bits + mov [FlowControl],bx + pop ebx ; Baud rate + jmp short .parse_baud +.nobaud: + mov ebx,DEFAULT_BAUD ; No baud rate given +.parse_baud: + pop di ; Serial port # + cmp ebx,byte 75 + jb .err ; < 75 baud == bogus + mov eax,BAUD_DIVISOR + cdq + div ebx + mov [BaudDivisor],ax + push ax ; Baud rate divisor + cmp di,3 + ja .port_is_io ; If port > 3 then port is I/O addr + shl di,1 + mov di,[di+serial_base] ; Get the I/O port from the BIOS +.port_is_io: + mov [SerialPort],di + + ; + ; Begin code to actually set up the serial port + ; + call sirq_cleanup_nowipe ; Cleanup existing IRQ handler + + lea dx,[di+3] ; DX -> LCR + mov al,83h ; Enable DLAB + slow_out dx,al + + pop ax ; Divisor + mov dx,di ; DX -> LS + slow_out dx,al + + inc dx ; DX -> MS + mov al,ah + slow_out dx,al + + mov al,03h ; Disable DLAB + inc dx ; DX -> LCR + inc dx + slow_out dx,al + + in al,dx ; Read back LCR (detect missing hw) + cmp al,03h ; If nothing here we'll read 00 or FF + jne .err ; Assume serial port busted + dec dx ; DX -> IIR/FCR + mov al,01h + slow_out dx,al ; Enable FIFOs if present + in al,dx + cmp al,0C0h ; FIFOs enabled and usable? + jae .fifo_ok + xor ax,ax ; Disable FIFO if unusable + slow_out dx,al +.fifo_ok: + + inc dx + inc dx ; DX -> MCR + mov al,[FlowOutput] ; Assert bits + slow_out dx,al + + ; Enable interrupts if requested + test al,8 + jz .noirq + call sirq_install +.noirq: + + ; Show some life + cmp byte [SerialNotice],0 + je .notfirst + mov byte [SerialNotice],0 + + mov si,syslinux_banner + call write_serial_str + mov si,copyright_str + call write_serial_str +.notfirst: + ret + +.err: + mov [SerialPort], word 0 + ret + +; +; Store mangled filename command (F-keys, "initrd") +; +pc_filename: push ax + call pc_getline + pop di + pm_call pm_mangle_name ; Mangle file name + ret + +; +; "label" command +; +pc_label: call commit_vk ; Commit any current vkernel + mov byte [InitRD+NULLOFFSET],NULLFILE ; No "initrd" statement + mov di,VKernelBuf ; Erase the vkernelbuf for better compression + mov cx,(vk_size >> 1) + xor ax,ax + rep stosw + call pc_getline + mov di,VKernelBuf+vk_vname + mov cx,FILENAME_MAX-1 +.loop: + lodsb + cmp al,' ' + jna .done + stosb + loop .loop +.done: + mov byte [VKernel],1 ; We've seen a "label" statement + mov si,VKernelBuf+vk_vname ; By default, rname == mangled vname + mov di,VKernelBuf+vk_rname + pm_call pm_mangle_name + mov si,AppendBuf ; Default append==global append + mov di,VKernelBuf+vk_append + mov cx,[AppendLen] + mov [VKernelBuf+vk_appendlen],cx + rep movsb +%if IS_PXELINUX ; PXELINUX only + mov al,[IPAppend] ; Default ipappend==global ipappend + mov [VKernelBuf+vk_ipappend],al +%endif + ret + +; +; "say" command +; +pc_say: call pc_getline ; "say" command + call writestr + jmp crlf ; tailcall + +; +; "text" command; ignore everything until we get an "endtext" line +; +pc_text: call skipline ; Ignore rest of line +.loop: + call pc_getline + jc .eof + + ; Leading spaces are already removed... + lodsd + and eax,0xdfdfdfdf ; Upper case + cmp eax,'ENDT' + jne .loop + lodsd + and eax,0x00dfdfdf ; Upper case and mask + cmp eax,'EXT' + jne .loop + ; If we get here we hit ENDTEXT +.eof: + ret + +; +; Comment line +; +pc_comment: ; Fall into pc_getline + +; +; Common subroutine: load line into trackbuf; returns with SI -> trackbuf +; CF is set on EOF. +; +pc_getline: mov di,trackbuf + push di + call getline + mov byte [di],0 ; Null-terminate + pop si + ret + +; +; Main loop for configuration file parsing +; +parse_config: + mov di,VKernelBuf ; Clear VKernelBuf at start + xor ax,ax + mov cx,vk_size + rep stosb + +.again: + call getcommand ; Parse one command + jnc .again ; If not EOF... + call close + dec word [IncludeLevel] ; Still parsing? + jnz .again + + ; + ; The fall through to commit_vk to commit any final + ; VKernel being read + ; +; +; commit_vk: Store the current VKernelBuf into buffer segment +; +commit_vk: + cmp byte [VKernel],0 + jz .nolabel ; Nothing to commit... + + mov di,VKernelBuf+vk_append + add di,[VKernelBuf+vk_appendlen] + + ; If we have an initrd statement, append it to the + ; append statement + cmp byte [InitRD+NULLOFFSET],NULLFILE + je .noinitrd + + mov si,str_initrd + mov cx,7 ; "initrd=" + rep movsb + mov si,InitRD + call strcpy + mov byte [es:di-1],' ' + + ; For better compression, clean up the append field +.noinitrd: + mov ax,di + sub ax,VKernelBuf+vk_append + mov [VKernelBuf+vk_appendlen],ax + mov cx,max_cmd_len+1 + sub cx,ax + xor ax,ax + rep stosb + + ; Pack into high memory + mov esi,VKernelBuf + mov edi,[VKernelEnd] + mov ecx,vk_size + pm_call rllpack + mov [VKernelEnd],edi +.nolabel: + ret +.overflow: + mov si,vk_overflow_msg + call writestr + ret + + section .data16 +vk_overflow_msg db 'Out of memory parsing config file', CR, LF, 0 +SerialNotice db 1 ; Only print this once + + section .bss16 + alignb 4 +VKernelEnd resd 1 ; Lowest high memory address used + + ; This symbol should be used by loaders to indicate + ; the highest address *they* are allowed to use. +HighMemRsvd equ VKernelEnd + ; by vkernels + section .config + alignz 4 +KbdTimeout dd 0 ; Keyboard timeout (if any) +TotalTimeout dd 0 ; Total timeout (if any) +AppendLen dw 0 ; Bytes in append= command +OntimeoutLen dw 0 ; Bytes in ontimeout command +OnerrorLen dw 0 ; Bytes in onerror command +CmdLinePtr dw cmd_line_here ; Command line advancing pointer +ForcePrompt dw 0 ; Force prompt +NoEscape dw 0 ; No escape +NoComplete dw 0 ; No label completion on TAB key +AllowImplicit dw 1 ; Allow implicit kernels +AllowOptions dw 1 ; User-specified options allowed +IncludeLevel dw 1 ; Nesting level +DefaultLevel dw 0 ; The current level of default +VKernel db 0 ; Have we seen any "label" statements? + +%if IS_PXELINUX +IPAppend db 0 ; Default IPAPPEND option +%endif + + section .uibss + alignb 4 ; For the good of REP MOVSD +command_line resb max_cmd_len+2 ; Command line buffer + alignb 4 +default_cmd resb max_cmd_len+1 ; "default" command line |