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Diffstat (limited to 'contrib/syslinux/syslinux-4.03/core/pxelinux.asm')
| -rw-r--r-- | contrib/syslinux/syslinux-4.03/core/pxelinux.asm | 545 |
1 files changed, 0 insertions, 545 deletions
diff --git a/contrib/syslinux/syslinux-4.03/core/pxelinux.asm b/contrib/syslinux/syslinux-4.03/core/pxelinux.asm deleted file mode 100644 index a46b3da..0000000 --- a/contrib/syslinux/syslinux-4.03/core/pxelinux.asm +++ /dev/null @@ -1,545 +0,0 @@ -; -*- fundamental -*- (asm-mode sucks) -; **************************************************************************** -; -; pxelinux.asm -; -; A program to boot Linux kernels off a TFTP server using the Intel PXE -; network booting API. It is based on the SYSLINUX boot loader for -; MS-DOS floppies. -; -; 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. -; -; **************************************************************************** - -%define IS_PXELINUX 1 -%include "head.inc" -%include "pxe.inc" - -; gPXE extensions support -%define GPXE 1 - -; -; Some semi-configurable constants... change on your own risk. -; -my_id equ pxelinux_id -NULLFILE equ 0 ; Zero byte == null file name -NULLOFFSET equ 0 ; Position in which to look -REBOOT_TIME equ 5*60 ; If failure, time until full reset -%assign HIGHMEM_SLOP 128*1024 ; Avoid this much memory near the top -TFTP_BLOCKSIZE_LG2 equ 9 ; log2(bytes/block) -TFTP_BLOCKSIZE equ (1 << TFTP_BLOCKSIZE_LG2) - -SECTOR_SHIFT equ TFTP_BLOCKSIZE_LG2 -SECTOR_SIZE equ TFTP_BLOCKSIZE - -; -; The following structure is used for "virtual kernels"; i.e. LILO-style -; option labels. The options we permit here are `kernel' and `append -; Since there is no room in the bottom 64K for all of these, we -; stick them in high memory and copy them down before we need them. -; - struc vkernel -vk_vname: resb FILENAME_MAX ; Virtual name **MUST BE FIRST!** -vk_rname: resb FILENAME_MAX ; Real name -vk_ipappend: resb 1 ; "IPAPPEND" flag -vk_type: resb 1 ; Type of file -vk_appendlen: resw 1 - alignb 4 -vk_append: resb max_cmd_len+1 ; Command line - alignb 4 -vk_end: equ $ ; Should be <= vk_size - endstruc - - -; --------------------------------------------------------------------------- -; BEGIN CODE -; --------------------------------------------------------------------------- - -; -; Memory below this point is reserved for the BIOS and the MBR -; - section .earlybss - global trackbuf -trackbufsize equ 8192 -trackbuf resb trackbufsize ; Track buffer goes here - ; ends at 2800h - - ; These fields save information from before the time - ; .bss is zeroed... must be in .earlybss - global InitStack -InitStack resd 1 - - section .bss16 - alignb FILENAME_MAX -PXEStack resd 1 ; Saved stack during PXE call - - alignb 4 - global DHCPMagic, RebootTime, APIVer -RebootTime resd 1 ; Reboot timeout, if set by option -StrucPtr resw 2 ; Pointer to PXENV+ or !PXE structure -APIVer resw 1 ; PXE API version found -LocalBootType resw 1 ; Local boot return code -DHCPMagic resb 1 ; PXELINUX magic flags - - section .text16 -StackBuf equ STACK_TOP-44 ; Base of stack if we use our own -StackHome equ StackBuf - - ; PXE loads the whole file, but assume it can't be more - ; than (384-31)K in size. -MaxLMA equ 384*1024 - -; -; Primary entry point. -; -bootsec equ $ -_start: - jmp 0:_start1 ; Canonicalize the address and skip - ; the patch header - -; -; Patch area for adding hardwired DHCP options -; - align 4 - -hcdhcp_magic dd 0x2983c8ac ; Magic number -hcdhcp_len dd 7*4 ; Size of this structure -hcdhcp_flags dd 0 ; Reserved for the future - ; Parameters to be parsed before the ones from PXE -bdhcp_offset dd 0 ; Offset (entered by patcher) -bdhcp_len dd 0 ; Length (entered by patcher) - ; Parameters to be parsed *after* the ones from PXE -adhcp_offset dd 0 ; Offset (entered by patcher) -adhcp_len dd 0 ; Length (entered by patcher) - -_start1: - pushfd ; Paranoia... in case of return to PXE - pushad ; ... save as much state as possible - push ds - push es - push fs - push gs - - cld ; Copy upwards - xor ax,ax - mov ds,ax - mov es,ax - -%if 0 ; debugging code only... not intended for production use - ; Clobber the stack segment, to test for specific pathologies - mov di,STACK_BASE - mov cx,STACK_LEN >> 1 - mov ax,0xf4f4 - rep stosw - - ; Clobber the tail of the 64K segment, too - extern __bss1_end - mov di,__bss1_end - sub cx,di ; CX = 0 previously - shr cx,1 - rep stosw -%endif - - ; That is all pushed onto the PXE stack. Save the pointer - ; to it and switch to an internal stack. - mov [InitStack],sp - mov [InitStack+2],ss - - lss esp,[BaseStack] - sti ; Stack set up and ready -; -; Move the hardwired DHCP options (if present) to a safe place... -; -bdhcp_copy: - mov cx,[bdhcp_len] - mov ax,trackbufsize/2 - jcxz .none - cmp cx,ax - jbe .oksize - mov cx,ax - mov [bdhcp_len],ax -.oksize: - mov eax,[bdhcp_offset] - add eax,_start - mov si,ax - and si,000Fh - shr eax,4 - push ds - mov ds,ax - mov di,trackbuf - add cx,3 - shr cx,2 - rep movsd - pop ds -.none: - -adhcp_copy: - mov cx,[adhcp_len] - mov ax,trackbufsize/2 - jcxz .none - cmp cx,ax - jbe .oksize - mov cx,ax - mov [adhcp_len],ax -.oksize: - mov eax,[adhcp_offset] - add eax,_start - mov si,ax - and si,000Fh - shr eax,4 - push ds - mov ds,ax - mov di,trackbuf+trackbufsize/2 - add cx,3 - shr cx,2 - rep movsd - pop ds -.none: - -; -; Initialize screen (if we're using one) -; -%include "init.inc" - -; -; Tell the user we got this far -; - mov si,syslinux_banner - call writestr_early - - mov si,copyright_str - call writestr_early - -; -; do fs initialize -; - mov eax,ROOT_FS_OPS - xor ebp,ebp - pm_call fs_init - - section .rodata - alignz 4 -ROOT_FS_OPS: - extern pxe_fs_ops - dd pxe_fs_ops - dd 0 - - - section .text16 -; -; Initialize the idle mechanism -; - call reset_idle - -; -; Now we're all set to start with our *real* business. First load the -; configuration file (if any) and parse it. -; -; In previous versions I avoided using 32-bit registers because of a -; rumour some BIOSes clobbered the upper half of 32-bit registers at -; random. I figure, though, that if there are any of those still left -; they probably won't be trying to install Linux on them... -; -; The code is still ripe with 16-bitisms, though. Not worth the hassle -; to take'm out. In fact, we may want to put them back if we're going -; to boot ELKS at some point. -; - -; -; Linux kernel loading code is common. However, we need to define -; a couple of helper macros... -; - -; Unload PXE stack -%define HAVE_UNLOAD_PREP -%macro UNLOAD_PREP 0 - pm_call unload_pxe -%endmacro - -; -; Load configuration file -; - pm_call pm_load_config - jz no_config_file - -; -; Now we have the config file open. Parse the config file and -; run the user interface. -; -%include "ui.inc" - -; -; Boot to the local disk by returning the appropriate PXE magic. -; AX contains the appropriate return code. -; -local_boot: - push cs - pop ds - mov [LocalBootType],ax - call vgaclearmode - mov si,localboot_msg - call writestr_early - ; Restore the environment we were called with - pm_call reset_pxe - call cleanup_hardware - lss sp,[InitStack] - pop gs - pop fs - pop es - pop ds - popad - mov ax,[cs:LocalBootType] - cmp ax,-1 ; localboot -1 == INT 18h - je .int18 - popfd - retf ; Return to PXE -.int18: - popfd - int 18h - jmp 0F000h:0FFF0h - hlt - -; -; kaboom: write a message and bail out. Wait for quite a while, -; or a user keypress, then do a hard reboot. -; -; Note: use BIOS_timer here; we may not have jiffies set up. -; - global kaboom -kaboom: - RESET_STACK_AND_SEGS AX -.patch: mov si,bailmsg - call writestr_early ; Returns with AL = 0 -.drain: call pollchar - jz .drained - call getchar - jmp short .drain -.drained: - mov edi,[RebootTime] - mov al,[DHCPMagic] - and al,09h ; Magic+Timeout - cmp al,09h - je .time_set - mov edi,REBOOT_TIME -.time_set: - mov cx,18 -.wait1: push cx - mov ecx,edi -.wait2: mov dx,[BIOS_timer] -.wait3: call pollchar - jnz .keypress - call do_idle - cmp dx,[BIOS_timer] - je .wait3 - loop .wait2,ecx - mov al,'.' - call writechr - pop cx - loop .wait1 -.keypress: - call crlf - mov word [BIOS_magic],0 ; Cold reboot - jmp 0F000h:0FFF0h ; Reset vector address - - -; -; pxenv -; -; This is the main PXENV+/!PXE entry point, using the PXENV+ -; calling convention. This is a separate local routine so -; we can hook special things from it if necessary. In particular, -; some PXE stacks seem to not like being invoked from anything but -; the initial stack, so humour it. -; -; While we're at it, save and restore all registers. -; - global pxenv -pxenv: - pushfd - pushad - - mov [cs:PXEStack],sp - mov [cs:PXEStack+2],ss - lss sp,[cs:InitStack] - - ; Pre-clear the Status field - mov word [es:di],cs - - ; This works either for the PXENV+ or the !PXE calling - ; convention, as long as we ignore CF (which is redundant - ; with AX anyway.) - push es - push di - push bx -.jump: call 0:0 - add sp,6 - mov [cs:PXEStatus],ax - - lss sp,[cs:PXEStack] - - mov bp,sp - and ax,ax - setnz [bp+32] ; If AX != 0 set CF on return - - ; This clobbers the AX return, but we already saved it into - ; the PXEStatus variable. - popad - popfd ; Restore flags (incl. IF, DF) - ret - -; Must be after function def due to NASM bug - global PXEEntry -PXEEntry equ pxenv.jump+1 - - section .bss16 - alignb 2 -PXEStatus resb 2 - - - section .text16 -; -; Invoke INT 1Ah on the PXE stack. This is used by the "Plan C" method -; for finding the PXE entry point. -; - global pxe_int1a -pxe_int1a: - mov [cs:PXEStack],sp - mov [cs:PXEStack+2],ss - lss sp,[cs:InitStack] - - int 1Ah ; May trash registers - - lss sp,[cs:PXEStack] - ret - -; -; Special unload for gPXE: this switches the InitStack from -; gPXE to the ROM PXE stack. -; -%if GPXE - global gpxe_unload -gpxe_unload: - mov bx,PXENV_FILE_EXIT_HOOK - mov di,pxe_file_exit_hook - call pxenv - jc .plain - - ; Now we actually need to exit back to gPXE, which will - ; give control back to us on the *new* "original stack"... - pushfd - push ds - push es - mov [PXEStack],sp - mov [PXEStack+2],ss - lss sp,[InitStack] - pop gs - pop fs - pop es - pop ds - popad - popfd - xor ax,ax - retf -.resume: - cli - - ; gPXE will have a stack frame looking much like our - ; InitStack, except it has a magic cookie at the top, - ; and the segment registers are in reverse order. - pop eax - pop ax - pop bx - pop cx - pop dx - push ax - push bx - push cx - push dx - mov [cs:InitStack],sp - mov [cs:InitStack+2],ss - lss sp,[cs:PXEStack] - pop es - pop ds - popfd - -.plain: - ret - - section .data16 - alignz 4 -pxe_file_exit_hook: -.status: dw 0 -.offset: dw gpxe_unload.resume -.seg: dw 0 -%endif - - section .text16 - -; ----------------------------------------------------------------------------- -; Common modules -; ----------------------------------------------------------------------------- - -%include "common.inc" ; Universal modules -%include "writestr.inc" ; String output -writestr_early equ writestr -%include "writehex.inc" ; Hexadecimal output -%include "rawcon.inc" ; Console I/O w/o using the console functions - -; ----------------------------------------------------------------------------- -; Begin data section -; ----------------------------------------------------------------------------- - - section .data16 - -copyright_str db ' Copyright (C) 1994-' - asciidec YEAR - db ' H. Peter Anvin et al', CR, LF, 0 -err_bootfailed db CR, LF, 'Boot failed: press a key to retry, or wait for reset...', CR, LF, 0 -bailmsg equ err_bootfailed -localboot_msg db 'Booting from local disk...', CR, LF, 0 -syslinux_banner db CR, LF, MY_NAME, ' ', VERSION_STR, ' ', DATE_STR, ' ', 0 - -; -; Config file keyword table -; -%include "keywords.inc" - -; -; Extensions to search for (in *forward* order). -; (.bs and .bss16 are disabled for PXELINUX, since they are not supported) -; - alignz 4 -exten_table: db '.cbt' ; COMBOOT (specific) - db '.0', 0, 0 ; PXE bootstrap program - db '.com' ; COMBOOT (same as DOS) - db '.c32' ; COM32 -exten_table_end: - dd 0, 0 ; Need 8 null bytes here - -; -; Misc initialized (data) variables -; - section .data16 - global KeepPXE -KeepPXE db 0 ; Should PXE be kept around? - -; -; IP information. Note that the field are in the same order as the -; Linux kernel expects in the ip= option. -; - section .bss16 - alignb 4 - global IPInfo -IPInfo: -.IPv4 resd 1 ; IPv4 information -.MyIP resd 1 ; My IP address -.ServerIP resd 1 -.GatewayIP resd 1 -.Netmask resd 1 |