cmd_line_here equ $ ; 8000 Should be out of the way
endstruc
-setup_seg equ 9020h
- struc setup_seg_t
- org 0h ; as 9020:0000, not 9000:0200
-setup_entry equ $
- endstruc
-
;
; Kernel command line signature
;
;
LOAD_HIGH equ 01h ; Large kernel, load high
CAN_USE_HEAP equ 80h ; Boot loader reports heap size
+
;
; 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 at 8000:0000 and copy them down before we need them.
+; stick them at vk_seg:0000 and copy them down before we need them.
;
; Note: this structure can be added to, but it must
;
add esi,(real_mode_seg << 4) ; Pointer to source
mov edi,100000h ; Copy to address 100000h
call bcopy ; Transfer to high memory
-;
- push word xfer_buf_seg ; Segment 7000h is xfer buffer
+
+ push word xfer_buf_seg ; Transfer buffer segment
pop es
high_load_loop:
mov si,dot_msg ; Progress report
; the command line to exist in the 9xxxxh range even if the rest of the
; setup doesn't.
;
+ cli ; In case of hooked interrupts
test byte [LoadFlags],LOAD_HIGH
jz need_high_cmdline
cmp word [fs:su_version],0202h ; Support new cmdline protocol?
;
; Copy real_mode stuff up to 90000h
;
- cli ; In case of hooked interrupts
mov ax,real_mode_seg
mov fs,ax
mov ax,9000h
pop bx
lc_ret: ret
+; ----------------------------------------------------------------------------------
+; Begin data section
+; ----------------------------------------------------------------------------------
+
+CR equ 13 ; Carriage Return
+LF equ 10 ; Line Feed
+FF equ 12 ; Form Feed
+BS equ 8 ; Backspace
+
;
; Lower-case table for codepage 865
;
db 139, 140, 141, 132, 134, 130, 145, 145, 147, 148, 149
db 150, 151, 152, 148, 129, 155, 156, 155, 158, 159, 160
db 161, 162, 163, 164, 164
-;
-; Various initialized or semi-initialized variables
-;
+
copyright_str db ' Copyright (C) 1994-', year, ' H. Peter Anvin'
- db 0Dh, 0Ah, 0
+ db CR, LF, 0
boot_prompt db 'boot: ', 0
wipe_char db 08h, ' ', 08h, 0
err_notfound db 'Could not find kernel image: ',0
-err_notkernel db 0Dh, 0Ah, 'Invalid or corrupt kernel image.', 0Dh, 0Ah, 0
+err_notkernel db CR, LF, 'Invalid or corrupt kernel image.', CR, LF, 0
err_not386 db 'It appears your computer uses a 286 or lower CPU.'
- db 0Dh, 0Ah
+ db CR, LF
db 'You cannot run Linux unless you have a 386 or higher CPU'
- db 0Dh, 0Ah
+ db CR, LF
db 'in your machine. If you get this message in error, hold'
- db 0Dh, 0Ah
+ db CR, LF
db 'down the Ctrl key while booting, and I will take your'
- db 0Dh, 0Ah
- db 'word for it.', 0Dh, 0Ah, 0
+ db CR, LF
+ db 'word for it.', CR, LF, 0
err_noram db 'It appears your computer has less than 512K of low ("DOS")'
- db 0Dh, 0Ah
+ db CR, LF
db 'RAM. Linux needs at least this amount to boot. If you get'
- db 0Dh, 0Ah
+ db CR, LF
db 'this message in error, hold down the Ctrl key while'
- db 0Dh, 0Ah
- db 'booting, and I will take your word for it.', 0Dh, 0Ah, 0
-err_badcfg db 'Unknown keyword in syslinux.cfg.', 0Dh, 0Ah, 0
-err_noparm db 'Missing parameter in syslinux.cfg.', 0Dh, 0Ah, 0
-err_noinitrd db 0Dh, 0Ah, 'Could not find ramdisk image: ', 0
-err_nohighmem db 'Not enough memory to load specified kernel.', 0Dh, 0Ah, 0
-err_highload db 0Dh, 0Ah, 'Kernel transfer failure.', 0Dh, 0Ah, 0
+ db CR, LF
+ db 'booting, and I will take your word for it.', CR, LF, 0
+err_badcfg db 'Unknown keyword in syslinux.cfg.', CR, LF, 0
+err_noparm db 'Missing parameter in syslinux.cfg.', CR, LF, 0
+err_noinitrd db CR, LF, 'Could not find ramdisk image: ', 0
+err_nohighmem db 'Not enough memory to load specified kernel.', CR, LF, 0
+err_highload db CR, LF, 'Kernel transfer failure.', CR, LF, 0
err_oldkernel db 'Cannot load a ramdisk with an old kernel image.'
- db 0Dh, 0Ah, 0
-err_notdos db ': attempted DOS system call', 0Dh, 0Ah, 0
-err_comlarge db 'COMBOOT image too large.', 0Dh, 0Ah, 0
-err_bootsec db 'Invalid or corrupt boot sector image.', 0Dh, 0Ah, 0
-err_a20 db 0Dh, 0Ah, 'A20 gate not responding!', 0Dh, 0Ah, 0
-err_bootfailed db 0Dh, 0Ah, 'Boot failed: please change disks and press '
- db 'a key to continue.', 0Dh, 0Ah, 0
-ready_msg db ' ready.', 0Dh, 0Ah, 0
+ db CR, LF, 0
+err_notdos db ': attempted DOS system call', CR, LF, 0
+err_comlarge db 'COMBOOT image too large.', CR, LF, 0
+err_bootsec db 'Invalid or corrupt boot sector image.', CR, LF, 0
+err_a20 db CR, LF, 'A20 gate not responding!', CR, LF, 0
+err_bootfailed db CR, LF, 'Boot failed: please change disks and press '
+ db 'a key to continue.', CR, LF, 0
+ready_msg db ' ready.', CR, LF, 0
loading_msg db 'Loading ', 0
dotdot_msg db '.'
dot_msg db '.', 0
aborted_msg db ' aborted.' ; Fall through to crlf_msg!
-crlf_msg db 0Dh, 0Ah, 0
-crff_msg db 0Dh, 0Ch, 0
+crlf_msg db CR, LF, 0
+crff_msg db CR, FF, 0
syslinux_cfg db 'SYSLINUXCFG'
;
; Command line options we'd like to take a look at
; the Linux kernel.
;
real_mode_seg equ 5000h
+fake_setup_seg equ real_mode_seg+020h
+
struc real_mode_seg_t
resb 20h-($-$$) ; org 20h
-kern_cmd_magic resw 1 ; Magic # for command line
-kern_cmd_offset resw 1 ; Offset for kernel command line
+kern_cmd_magic resw 1 ; 0020 Magic # for command line
+kern_cmd_offset resw 1 ; 0022 Offset for kernel command line
resb 497-($-$$) ; org 497d
-bs_setupsecs resb 1 ; Sectors for setup code (0 -> 4)
-bs_rootflags resw 1 ; Root readonly flag
-bs_syssize resw 1
-bs_swapdev resw 1 ; Swap device (obsolete)
-bs_ramsize resw 1 ; Ramdisk flags, formerly ramdisk size
-bs_vidmode resw 1 ; Video mode
-bs_rootdev resw 1 ; Root device
-bs_bootsign resw 1 ; Boot sector signature (0AA55h)
-su_jump resb 1 ; 0EBh
-su_jump2 resb 1
-su_header resd 1 ; New setup code: header
-su_version resw 1 ; See linux/arch/i386/boot/setup.S
-su_switch resw 1
-su_setupseg resw 1
-su_startsys resw 1
-su_kver resw 1 ; Kernel version pointer
-su_loader resb 1 ; Loader ID
-su_loadflags resb 1 ; Load high flag
-su_movesize resw 1
-su_code32start resd 1 ; Start of code loaded high
-su_ramdiskat resd 1 ; Start of initial ramdisk
+bs_setupsecs resb 1 ; 01F1 Sectors for setup code (0 -> 4)
+bs_rootflags resw 1 ; 01F2 Root readonly flag
+bs_syssize resw 1 ; 01F4
+bs_swapdev resw 1 ; 01F6 Swap device (obsolete)
+bs_ramsize resw 1 ; 01F8 Ramdisk flags, formerly ramdisk size
+bs_vidmode resw 1 ; 01FA Video mode
+bs_rootdev resw 1 ; 01FC Root device
+bs_bootsign resw 1 ; 01FE Boot sector signature (0AA55h)
+su_jump resb 1 ; 0200 0EBh
+su_jump2 resb 1 ; 0201 Size of following header
+su_header resd 1 ; 0202 New setup code: header
+su_version resw 1 ; 0206 See linux/arch/i386/boot/setup.S
+su_switch resw 1 ; 0208
+su_setupseg resw 1 ; 020A
+su_startsys resw 1 ; 020C
+su_kver resw 1 ; 020E Kernel version pointer
+su_loader resb 1 ; 0210 Loader ID
+su_loadflags resb 1 ; 0211 Load high flag
+su_movesize resw 1 ; 0212
+su_code32start resd 1 ; 0214 Start of code loaded high
+su_ramdiskat resd 1 ; 0218 Start of initial ramdisk
su_ramdisklen equ $ ; Length of initial ramdisk
-su_ramdisklen1 resw 1
-su_ramdisklen2 resw 1
-su_bsklugeoffs resw 1
-su_bsklugeseg resw 1
-su_heapend resw 1
+su_ramdisklen1 resw 1 ; 021C
+su_ramdisklen2 resw 1 ; 021E
+su_bsklugeoffs resw 1 ; 0220
+su_bsklugeseg resw 1 ; 0222
+su_heapend resw 1 ; 0224
+su_pad1 resw 1 ; 0226
+su_cmd_line_ptr resd 1 ; 0228
resb (8000h-12)-($-$$) ; Were bootsect.S puts it...
-linux_stack equ $
+linux_stack equ $ ; 7FF4
linux_fdctab equ $
resb 8000h-($-$$)
-cmd_line_here equ $ ; Should be out of the way
+cmd_line_here equ $ ; 8000 Should be out of the way
endstruc
-setup_seg equ 9020h
-setup_entry equ 0h ; Entry point 9020:0000
-
;
-; BOOTP/DHCP packet pattern
+; Kernel command line signature
;
- struc bootp_t
-bootp:
-.opcode resb 1 ; BOOTP/DHCP "opcode"
-.hardware resb 1 ; ARP hardware type
-.hardlen resb 1 ; Hardware address length
-.gatehops resb 1 ; Used by forwarders
-.ident resd 1 ; Transaction ID
-.seconds resw 1 ; Seconds elapsed
-.flags resw 1 ; Broadcast flags
-.cip resd 1 ; Client IP
-.yip resd 1 ; "Your" IP
-.sip resd 1 ; Next server IP
-.gip resd 1 ; Relay agent IP
-.macaddr resb 16 ; Client MAC address
-.sname resb 64 ; Server name (optional)
-.bootfile resb 128 ; Boot file name
-.v_magic resd 1 ; DHCP magic cookie
-.v_flags resd 1 ; DHCP flags
-.v_pad resb 56 ; Vendor options padding
- endstruc
+CMD_MAGIC equ 0A33Fh ; Command line magic
;
; Magic number of su_header field
;
HEADER_ID equ 'HdrS' ; HdrS (in littleendian hex)
+
;
; Flags for the su_loadflags field
;
LOAD_HIGH equ 01h ; Large kernel, load high
CAN_USE_HEAP equ 80h ; Boot loader reports heap size
+
;
; The following structure is used for "virtual kernels"; i.e. LILO-style
; option labels. The options we permit here are `kernel' and `append
xfer_buf_seg equ 3000h ; Bounce buffer for I/O to high mem
comboot_seg equ 2000h ; COMBOOT image loading zone
-fat_seg equ 0h ; BOGUS
+;
+; BOOTP/DHCP packet pattern
+;
+ struc bootp_t
+bootp:
+.opcode resb 1 ; BOOTP/DHCP "opcode"
+.hardware resb 1 ; ARP hardware type
+.hardlen resb 1 ; Hardware address length
+.gatehops resb 1 ; Used by forwarders
+.ident resd 1 ; Transaction ID
+.seconds resw 1 ; Seconds elapsed
+.flags resw 1 ; Broadcast flags
+.cip resd 1 ; Client IP
+.yip resd 1 ; "Your" IP
+.sip resd 1 ; Next server IP
+.gip resd 1 ; Relay agent IP
+.macaddr resb 16 ; Client MAC address
+.sname resb 64 ; Server name (optional)
+.bootfile resb 128 ; Boot file name
+.v_magic resd 1 ; DHCP magic cookie
+.v_flags resd 1 ; DHCP flags
+.v_pad resb 56 ; Vendor options padding
+ endstruc
;
; TFTP connection data structure. Each one of these corresponds to a local
jmp kaboom
is_386:
; Now we know it's a 386 or higher
-
;
-; We can't do the low memory check that SYSLINUX does, since
-; the PXE code is up in high memory.
+; Now check that there is at least 384K of low (DOS) memory
;
+ int 12h
+ cmp ax,384
+ jae enough_ram
+ mov si,err_noram
+ call writestr
+ jmp kaboom
+enough_ram:
skip_checks:
;
;
; Construct the command line (append options have already been copied)
;
- mov word [es:kern_cmd_magic],0A33Fh ; Command line magic no
- mov word [es:kern_cmd_offset],cmd_line_here
mov di,[CmdLinePtr]
mov si,boot_image ; BOOT_IMAGE=
mov cx,boot_image_len
cmdline_end:
push cs ; Restore standard DS
pop ds
- sub di,cmd_line_here
- mov [CmdLineLen],di ; Length including final null
+ sub si,cmd_line_here
+ mov [CmdLineLen],si ; Length including final null
;
; Now check if we have a large kernel, which needs to be loaded high
;
;
call abort_check ; Last chance!!
-;
-; Now we're as close to be done as we can be and still use our normal
-; routines, print a CRLF to end the row of dots
-;
-; mov si,crlf_msg
-; call cwritestr
mov si,ready_msg
call cwritestr
;
mov sp,7C00h ; Set up a more normal stack
;
-; Copy real_mode stuff up to 90000h
+; Now, if we were supposed to load "low", copy the kernel down to 10000h
+; and the real mode stuff to 90000h. We assume that all bzImage kernels are
+; capable of starting their setup from a different address.
+;
+ mov bx,real_mode_seg ; Real mode segment
+ mov fs,bx ; FS -> real_mode_seg
+;
+; Copy command line. Unfortunately, the kernel boot protocol requires
+; the command line to exist in the 9xxxxh range even if the rest of the
+; setup doesn't.
;
cli ; In case of hooked interrupts
+ test byte [LoadFlags],LOAD_HIGH
+ jz need_high_cmdline
+ cmp word [fs:su_version],0202h ; Support new cmdline protocol?
+ jb need_high_cmdline
+ ; New cmdline protocol
+ ; Store 32-bit (flat) pointer to command line
+ mov dword [fs:su_cmd_line_ptr],(real_mode_seg << 4) + cmd_line_here
+ jmp short in_proper_place
+
+need_high_cmdline:
+;
+; Copy command line up to 90000h
+;
+ mov ax,9000h
+ mov es,ax
+ mov si,cmd_line_here
+ mov di,si
+ mov [fs:kern_cmd_magic],word CMD_MAGIC ; Store magic
+ mov [fs:kern_cmd_offset],di ; Store pointer
+
+ mov cx,[CmdLineLen]
+ add cx,byte 3
+ shr cx,2 ; Convert to dwords
+ fs rep movsd
+
+ test byte [LoadFlags],LOAD_HIGH
+ ; Note bx -> real_mode_seg still
+ jnz in_proper_place ; If high load, we're done
+
+;
+; Loading low; we can't assume it's safe to run in place.
+;
+; Copy real_mode stuff up to 90000h
+;
mov ax,real_mode_seg
mov fs,ax
mov ax,9000h
xor si,si
xor di,di
fs rep movsd ; Copy setup + boot sector
- mov si,cmd_line_here
- mov di,si
- mov cx,[CmdLineLen]
- add cx,byte 3
- shr cx,2 ; Convert to dwords
- fs rep movsd
;
; Some kernels in the 1.2 ballpark but pre-bzImage have more than 4
; setup sectors, but the boot protocol had not yet been defined. They
xor eax,eax
rep stosd ; Clear region
;
-; Now, if we were supposed to load "low", copy the kernel down to 10000h
-;
- test byte [LoadFlags],LOAD_HIGH
- jnz in_proper_place ; If high load, we're done
-
mov ecx,[KernelSize]
add ecx,3 ; Round upwards
shr ecx,2 ; Bytes -> dwords
mov esi,100000h
mov edi,10000h
call bcopy
+
+ mov bx,9000h ; Real mode segment
+
+;
+; Now everything is where it needs to be...
+;
in_proper_place:
+ mov es,bx ; Real mode segment
;
; If the default root device is set to FLOPPY (0000h), change to
; /dev/fd0 (0200h)
mov word [es:bs_rootdev],0200h
root_not_floppy:
;
+; Copy the disk table to high memory, then re-initialize the floppy
+; controller
+;
+; This needs to be moved before the copy
+;
+%if 0
+ push ds
+ push bx
+ lds si,[fdctab]
+ mov di,linux_fdctab
+ mov cx,3 ; 12 bytes
+ push di
+ rep movsd
+ pop di
+ mov [fdctab1],di ; Save new floppy tab pos
+ mov [fdctab2],es
+ xor ax,ax
+ xor dx,dx
+ int 13h
+ pop bx
+ pop ds
+%endif
+;
; Linux wants the floppy motor shut off before starting the kernel,
; at least bootsect.S seems to imply so
;
xor al,al
call slow_out
;
+; If we're debugging, wait for a keypress so we can read any debug messages
+;
+%ifdef debug
+ xor ax,ax
+ int 16h
+%endif
+;
; Set up segment registers and the Linux real-mode stack
+; Note: bx == the real mode segment
;
cli
- mov ax,9000h
- mov ds,ax
- mov es,ax
- mov fs,ax
- mov gs,ax
- mov ss,ax
+ ; es is already == real mode segment
+ mov ds,bx
+ mov fs,bx
+ mov gs,bx
+ mov ss,bx
mov sp,linux_stack
;
; We're done... now RUN THAT KERNEL!!!!
+; Setup segment == real mode segment + 020h; we need to jump to offset
+; zero in the real mode segment.
;
- jmp setup_seg:setup_entry
+ add bx,020h
+ push bx
+ push word 0h
+ retf
+
;
; Load an older kernel. Older kernels always have 4 setup sectors, can't have
; initrd, and are always loaded low.
; Begin data section
; ----------------------------------------------------------------------------------
-;
-; Various initialized or semi-initialized variables
-;
+CR equ 13 ; Carriage Return
+LF equ 10 ; Line Feed
+FF equ 12 ; Form Feed
+BS equ 8 ; Backspace
+
copyright_str db ' Copyright (C) 1994-', year, ' H. Peter Anvin'
- db 13, 10, 0
+ db CR, LF, 0
boot_prompt db 'boot: ', 0
wipe_char db 08h, ' ', 08h, 0
err_notfound db 'Could not find kernel image: ',0
-err_notkernel db 13, 10, 'Invalid or corrupt kernel image.', 13, 10, 0
+err_notkernel db CR, LF, 'Invalid or corrupt kernel image.', CR, LF, 0
err_not386 db 'It appears your computer uses a 286 or lower CPU.'
- db 13, 10
+ db CR, LF
db 'You cannot run Linux unless you have a 386 or higher CPU'
- db 13, 10
+ db CR, LF
db 'in your machine. If you get this message in error, hold'
- db 13, 10
+ db CR, LF
db 'down the Ctrl key while booting, and I will take your'
- db 13, 10
- db 'word for it.', 13, 10, 0
-err_badcfg db 'Unknown keyword in config file.', 13, 10, 0
-err_noparm db 'Missing parameter in config file.', 13, 10, 0
-err_noinitrd db 13, 10, 'Could not find ramdisk image: ', 0
-err_nohighmem db 'Not enough memory to load specified kernel.', 13, 10, 0
-err_highload db 13, 10, 'Kernel transfer failure.', 13, 10, 0
+ db CR, LF
+ db 'word for it.', CR, LF, 0
+err_noram db 'It appears your computer has less than 384K of low ("DOS")'
+ db 0Dh, 0Ah
+ db 'RAM. Linux needs at least this amount to boot. If you get'
+ db 0Dh, 0Ah
+ db 'this message in error, hold down the Ctrl key while'
+ db 0Dh, 0Ah
+ db 'booting, and I will take your word for it.', 0Dh, 0Ah, 0
+err_badcfg db 'Unknown keyword in config file.', CR, LF, 0
+err_noparm db 'Missing parameter in config file.', CR, LF, 0
+err_noinitrd db CR, LF, 'Could not find ramdisk image: ', 0
+err_nohighmem db 'Not enough memory to load specified kernel.', CR, LF, 0
+err_highload db CR, LF, 'Kernel transfer failure.', CR, LF, 0
err_oldkernel db 'Cannot load a ramdisk with an old kernel image.'
- db 13, 10, 0
-err_notdos db ': attempted DOS system call', 13, 10, 0
-err_comlarge db 'COMBOOT image too large.', 13, 10, 0
-err_bootsec db 'Invalid or corrupt boot sector image.', 13, 10, 0
-err_a20 db 13, 10, 'A20 gate not responding!', 13, 10, 0
-err_bootfailed db 13, 10, 'Boot failed: press a key to retry, or wait for reset...', 13, 10, 0
+ db CR, LF, 0
+err_notdos db ': attempted DOS system call', CR, LF, 0
+err_comlarge db 'COMBOOT image too large.', CR, LF, 0
+err_bootsec db 'Invalid or corrupt boot sector image.', CR, LF, 0
+err_a20 db CR, LF, 'A20 gate not responding!', 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
-err_nopxe db "No !PXE or PXENV+ API found; we're dead...", 13, 10, 0
+err_nopxe db "No !PXE or PXENV+ API found; we're dead...", CR, LF, 0
err_pxefailed db 'PXE API call failed, error ', 0
-err_udpinit db 'Failed to initialize UDP stack', 13, 10, 0
-err_oldtftp db 'TFTP server does not support the tsize option', 13, 10, 0
-found_pxenv db 'Found PXENV+ structure', 13, 10, 0
-using_pxenv_msg db 'Old PXE API detected, using PXENV+ structure', 13, 10, 0
+err_udpinit db 'Failed to initialize UDP stack', CR, LF, 0
+err_oldtftp db 'TFTP server does not support the tsize option', CR, LF, 0
+found_pxenv db 'Found PXENV+ structure', CR, LF, 0
+using_pxenv_msg db 'Old PXE API detected, using PXENV+ structure', CR, LF, 0
apiver_str db 'PXE API version is ',0
pxeentry_msg db 'PXE entry point found (we hope) at ', 0
pxenventry_msg db 'PXENV entry point found (we hope) at ', 0
trymempxe_msg db 'Scanning memory for !PXE structure... ', 0
trymempxenv_msg db 'Scanning memory for PXENV+ structure... ', 0
-notfound_msg db 'not found', 13, 10, 0
+notfound_msg db 'not found', CR, LF, 0
myipaddr_msg db 'My IP address seems to be ',0
tftpprefix_msg db 'TFTP prefix: ', 0
-cmdline_msg db 'Command line: ', 13, 10, 0
-ready_msg db 13, 10, 'Ready to start kernel...', 13, 10, 0
+cmdline_msg db 'Command line: ', CR, LF, 0
+ready_msg db ' ready.', CR, LF, 0
trying_msg db 'Trying to load: ', 0
loading_msg db 'Loading ', 0
dotdot_msg db '.'
dot_msg db '.', 0
-fourbs_msg db 8, 8, 8, 8, 0
+fourbs_msg db BS, BS, BS, BS, 0
aborted_msg db ' aborted.' ; Fall through to crlf_msg!
-crlf_msg db 13, 10, 0
-crff_msg db 13, 0Ch, 0
+crlf_msg db CR, LF, 0
+crff_msg db CR, FF, 0
default_str db 'default', 0
default_len equ ($-default_str)
-pxelinux_banner db 13, 10, 'PXELINUX ', version_str, ' ', date, ' ', 0
+pxelinux_banner db CR, LF, 'PXELINUX ', version_str, ' ', date, ' ', 0
cfgprefix db 'pxelinux.cfg/' ; No final null!
cfgprefix_len equ ($-cfgprefix)
projects / platform / upstream / syslinux.git / commitdiff