Re: [coreboot] ADLO for buildrom

[Jordan Crouse]

I don't know what the history of the ADLO code is - any reason why we can't
give it a home in payloads/ on SVN instead of living in the buildrom 
code?

Jordan

On 30/04/08 09:58 -0600, Myles Watson wrote:
> This patch adds ADLO to buildrom using the gcc ported BOCHS BIOS.  It
> boots Windows XP in QEMU.  It still needs as86 to be installed because
> I didn't port the loader yet.  Other things like making the loader
> understand the coreboot information to get the RAM map would be nice
> too.
>
> I'm attaching the ELF headers, since svn diff doesn't include binary files.
>
> Signed-off-by: Myles Watson
>
> Thanks,
> Myles
> Index: config/payloads/payloads.conf
>
> --- config/payloads/payloads.conf	(revision 170)
> +++ config/payloads/payloads.conf	(working copy)
> @@ -16,6 +16,7 @@
>  ### Include the correct payload configuration
>
> PCONF-y=
> +PCONF-$(CONFIG_PAYLOAD_ADLO) = adlo.conf
>  PCONF-$(CONFIG_PAYLOAD_LAB) = lab.conf
>  PCONF-$(CONFIG_PAYLOAD_ETHERBOOT) = etherboot.conf
>  PCONF-$(CONFIG_PAYLOAD_GPXE) = gpxe.conf
> @@ -28,6 +29,10 @@
>  PCONF-$(CONFIG_PAYLOAD_TINT) = tint.conf
>  PCONF-$(CONFIG_PAYLOAD_GRUB2) = grub2.conf
>
> +ifeq ($(PCONF-y),)
> +$(error No payload .conf file specified.)
> +endif
>
> DEPENDS-y=
>  include $(CONFIG_DIR)/payloads/$(PCONF-y)
> Index: config/payloads/adlo.conf
>
> --- config/payloads/adlo.conf	(revision 0)
> +++ config/payloads/adlo.conf	(revision 0)
> @@ -0,0 +1,15 @@
> +# Configuration file for the ADLO payload
>
> +# Common configuration options
>
> +PAYLOAD_BUILD=scripts/Makefile.generic
>
> +PAYLOAD_ELF=$(OUTPUT_DIR)/adlo-payload.elf
> +PAYLOAD_COMPRESSED=$(OUTPUT_DIR)/adlo-payload.elf.lzma
>
> +PAYLOAD=adlo
> +PAYLOAD-y=adlo
>
> +# Add legacybios as a dependency
> +PAYLOAD_AND_DEP_MK=$(PACKAGE_DIR)/legacybios/legacybios.mk $(PACKAGE_DIR)/adlo/adlo.mk
> +DEPENDS-y +=legacybios
> Index: config/payloads/Config.in
> ===================================================================
> --- config/payloads/Config.in	(revision 170)
> +++ config/payloads/Config.in	(working copy)
> @@ -9,6 +9,9 @@
>    help
>      Buildrom can build a number of different payloads for the ROM
>
> +config PAYLOAD_ADLO
> bool "ADLO (Bochs BIOS with a wrapper for Coreboot)"
>
> config PAYLOAD_COREINFO
>    bool "Coreinfo"
> Index: packages/adlo/adlo/STATUS
>
> --- packages/adlo/adlo/STATUS	(revision 0)
> +++ packages/adlo/adlo/STATUS	(revision 0)
> @@ -0,0 +1,154 @@
> +$Id: STATUS,v 1.1 2002/11/25 02:07:53 rminnich Exp $
> +==========================================
> +==========================================
> STATUS
>
> +==========================================
> +==========================================
>
> +LILO
> fully supported
> ==========================================
>
> +GRUB
> fully supported
> notes
> int15/eAX=00C0 - not supported
> int15/Eax=5300 - not supported
> int 13 ; fn 41 -> dev 81
> int 13 ; fn 08 -> dev 81
> ==========================================
>
> +LINUX
> fully supported
> notes
> won't reboot
> fix fb? 
> ==========================================
>
> +openbsd
> fully supported
> notes
> won't reboot
> ==========================================
>
> +Win2k
> fully supported
> notes
> network?
> better gfx?
> ==========================================
>
> +freebsd
> somewhat supported
> notes
> won't reboot
> right now it hangs somewhere around fsck/net startup
> probably due to bad PIRQ table, 
> it probably switches to polled IO and is dog slow.
> ==========================================
>
> +Win98
> somewhat supported
> lots of ata issues, but if get past
> ata hurdles, desktop will show up
> press F8 for safe mode.
> the desktop comes up 
> (can see "safe mode")
> int 15 D8 (?) not supporte
> int 15 ?? not supported
> int 15 fn 24 (set A20 gate) not suported)
> ==========================================
>
> +winXP
> no go
>
> +safe/normal boot
> progress bar finishes, switches to gfx mode
> and immediatelly STOP 7B, no sub error.
>
> +more timing problems!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> more likely "unexpected previous state" problems.
>
> +cold reboot, normal boot and safe mode
> missing hal
> \system32\hal.dll
> missing system
>
> +-------------------
> +no lba - ie none
> function 02, error 11 - drv not ready.
> ==========================================
> ==========================================
>
> +syslinux
> +netbsd
> +hurd
> +dos
> +other applications
> not supported/tested at present time
> ==========================================
>
> +TODO:
>
> +timing in ide read code (int13) [WIP]
> grub boot
> sometimes it work, sometimes it doesn't
> openbsd boot /WinXP boot.
> (AH=0x02) misreads sometimes.
>
> +fix int15 memory functions. (E820, etc)
> so that mem size is not hard coded.
> (see prep "fixup" section in loader.s)
>
> +fix bios to properly handle reboot
>
> +setup PIRQ table for P6STMT mbo.
> have it extract from coreboot somehow..
> find it in ram and copy...
>
> +hack gcc to support 16 bit real mode.
>
> +port 80 card broken?
>
> +hack dev86 to support rdmsr and wrmsr 		[done]
> ==========================================
>
> +problems:
> -binary only video bios required
> -binary only bios required
> -warm reboot from pc bios is required
> chipset timings or something
> P6STMT board only.
> int 12 not stable, multiple reboot required
> debug msg for slowing down required
> ==========================================
> Index: packages/adlo/adlo/README.1st
>
> --- packages/adlo/adlo/README.1st	(revision 0)
> +++ packages/adlo/adlo/README.1st	(revision 0)
> @@ -0,0 +1,37 @@
> +Date: Sat, 23 Nov 2002 22:20:57 -0500
> +From: Adam Sulmicki 
> +To: LinuxBIOS 
> +Cc: William Arbaugh , Adam Agnew 
> +Subject: [ANNOUNCE] LinuxBIOS boots Windows 2000, GRUB, and OpenBSD.
>
> +We're happy to announce that we've been able to successfully boot  
> +Windows 2000 without a legacy BIOS. We accomplished this by developing  
> +software that combined elements from two very successful projects:  
> +LinuxBIOS and BOCHS. The Etherboot project also helped in various ways.
>
> +As a result now, we have a completely open source replacement for the  
> +BIOS that can use (without modification) either LILO or GRUB as  
> +bootloaders, and Linux, OpenBSD, and Windows 2000 as operating systems  
> +(NOTE: We're still working on supporting FreeBSD and Windows XP. We  
> +expect that improving ATA support will permit Win98 and WinXP to boot,  
> +and finishing PIRQ support will permit FreeBSD to boot.) Motherboard  
> +support is also limited at this time, but we hope to expand that along  
> +with LinuxBIOS.
>
> +More details can be found at:
>
> +http://www.missl.cs.umd.edu/Projects/sebos/main.shtml
>
> +and
>
> +http://www.missl.cs.umd.edu/Projects/sebos/phase2.shtml
>
> +Ironically, twenty years ago this month Compaq introduced their Compaq  
> +portable computer with the first BIOS outside of IBM, see
> +http://www.old-computers.com/museum/computer.asp?st=1&c=547 .
>
> +Adam Sulmicki
> +Adam Agnew
> +William Arbaugh
>
> +This work has been funded by a grant from DARPA under the CHATS program.
> Index: packages/adlo/adlo/HACKING
> ===================================================================
> --- packages/adlo/adlo/HACKING	(revision 0)
> +++ packages/adlo/adlo/HACKING	(revision 0)
> @@ -0,0 +1,16 @@
> +DEVELOPER/HACKING/DESIGN
>
> +- bochs bios.
> we expect most of the bochs patches will be rolled back into
> the bochs mainline.
> thus when designing an patch for rombios.c both needs of
> coreboot as well as bochs needed to be taken into
> consideration.
>
> +- there are motherboard specific code in loader.s. until this issue
> is fixed, you need to adjust various motherboard specific
> settings in loader.s In particular control of the
> shadow ram.
> Index: packages/adlo/adlo/elf/elf-header-065kb.payload
>
> Cannot display: file marked as a binary type.
> svn:mime-type = application/octet-stream
>
> Property changes on: packages/adlo/adlo/elf/elf-header-065kb.payload
> ___________________________________________________________________
> Name: svn:executable
>
> Name: svn:mime-type
> application/octet-stream
> Index: packages/adlo/adlo/elf/elf-header-068kb.payload
>
> Cannot display: file marked as a binary type.
> svn:mime-type = application/octet-stream
>
> Property changes on: packages/adlo/adlo/elf/elf-header-068kb.payload
> ___________________________________________________________________
> Name: svn:executable
>
> Name: svn:mime-type
> application/octet-stream
> Index: packages/adlo/adlo/INSTALL
>
> --- packages/adlo/adlo/INSTALL	(revision 0)
> +++ packages/adlo/adlo/INSTALL	(revision 0)
> @@ -0,0 +1,47 @@
> +1) Are you familar with coreboot?
> no : abort
> yes: go to next step.
>
> +2) do you have Matsonic 7308e motherboard?
> no : you are on your own (untested).
> yes: go to next step.
>
> +3) do you have LiuxBIOS running on Matsonic 7308e motherboard?
> no : get it working first on your motherboard.
> yes: go to next step.
>
> +4) Acquire copy of your VIDEO BIOS.
> -Put in your PC BIOS into the system,
> -Boot into linux.
> -as root run "make videobios" from ADLO's root dir.
> -copy the file to video directory
> adjust make file as needed.
>
> +5) Acquire copy of your PIRQ table.
> At present time it is not necessary to do this
> and you can use supplied PIRQ table.
>
> +6) Acquire copy of BOCHS bios.
> At present time it is not necessary to do this
> and you can use supplied rombios.c.
> In fact you should use supplied rombios.c
> file as the one used with BOCHS is not
> complete at the present time.
>
> +7) Examine make file to see that it does what u want.
>
> +8) compile
> make
>
> +9) use the resulting elf "payload" file with coreboot as you would
> have used any other elf file. For example put it on the same
> EERPOM as coreboot is, or use EtherBOOT to load the payload
> file from hdd or network.
> Index: packages/adlo/adlo/loader.s
>
> --- packages/adlo/adlo/loader.s	(revision 0)
> +++ packages/adlo/adlo/loader.s	(revision 0)
> @@ -0,0 +1,467 @@
> +;*****************************************************
> +; $Id: loader.s,v 1.1 2002/11/25 02:07:53 rminnich Exp $
> +;*****************************************************
> +USE32
> +; code it is loaded into memory at 0x7C00
> +;*****************************************************
> +nop
> +nop
> +;*****************************************************
> +; A) setup GDT, so that we do not depend on program 
> +; that loaded us for GDT. 
> +; Ex: Coreboot and EtherBOOT use different GDT's.
>
> +;-----------------------------------------------------
> +; 0)
>
> +cli
>
> +;-----------------------------------------------------
> +; I)
>
> +lgdt [0x7C00+protected_gdt]
>
> +;-----------------------------------------------------
> +; II) setup CS
>
> +jmp 0x08:0x7C00+newpgdt
>
> +newpgdt: nop
>
> +;-----------------------------------------------------
> +; III) setup all other segments
>
> +mov ax,  #0x10
> +mov ss,  ax
> +mov ds,  ax
> +mov es,  ax
> +mov fs,  ax
> +mov gs,  ax
>
> +;-----------------------------------------------------
> +; IV)
>
> +; not now
> +;sti
>
> +;*****************************************************
> +nop
> +nop
> +;*****************************************************
> +; B) shadow - ON (enable/read/write)
>
> +mov eax, #0x80000070
> +mov dx,  #0x0cf8
> +out dx,  eax
>
> +mov eax, #0xFFFFFFFF
> +mov dx,  #0x0cfc
> +out dx,  eax
>
> +;*****************************************************
> +nop
> +nop
> +;*****************************************************
> +; C) copy -- boch bios
>
> +; counter - 64kb.     
> +mov ecx, #0x10000
>
> +; source - 0x8000  ( 0x7C00+0x400 = 0x8000 ) 
> +mov ax,  #0x10        ; src-segment - 2nd entry in GDT
> +mov ds,  ax
> +mov eax, #0x8000      ; src-offset  - 0x8000
> +mov esi, eax
>
> +; destination - 0xF0000
> +mov ax,  #0x10        ; dst-segment - 2nd entry in GDT
> +mov es,  ax     
> +mov eax, #0xF0000     ; dst-offset  - 0xF0000
> +mov edi, eax
>
> +; clear direction flag
> +cld
>
> +; the copy
> +rep
> movsb
>
> +;*****************************************************
> +nop
> +nop
> +;*****************************************************
> +; X) copy -- Coreboot table into safe place.
> ;; TODO.
> ;; Q1 :	 what is the size of table.
> ;; Q2 :	 where to copy?
>
> +;*****************************************************
> +nop
> +nop	
> +;*****************************************************
> +; E) shadow - OFF (write)
>
> +mov eax, #0x80000070
> +mov dx,  #0x0cf8
> +out dx,  eax
>
> +;mov eax, #0xFFFFFFFF
> +mov eax, #0x0000FFFF
> +mov dx,  #0x0cfc
> +out dx,  eax
>
> +;*****************************************************
> +nop
> +nop
> +;*****************************************************
> +; F) do a little prep work.
>
> +;-----------------------------------------------------
> +; I) disable cache
>
> +; if you disable cache, GRUB's GFX mode will be VERY slow.
> +; so DO NOT DISABLE
>
> +;mov eax, cr0
> +;or  eax, #0x60000000
> +;wbinvd
> +;mov cr0, eax
> +;wbinvd
>
> +;-----------------------------------------------------
> +; II) disable MTRR
> +; clear the "E" (0x800) and "FE" (0x400) flags in 
> +; IA32_MTRRdefType register (0x2FF)
>
> +;-----------------------
>
> +;mov ECX,#0x2FF
>
> +; select either of the two below 
> +; depending on if your compiler suports 
> +; {RD,WR}MSR or not
> +;rdmsr
> +; .byte 0x0F, 0x32
>
> +;xor edx, edx
> +; xor eax, eax
> +;and eax, #0xFFFFF3FF
>
> +; select either of the two below 
> +; depending on if your compiler suports 
> +; {RD,WR}MSR or not
> +;wrmsr
> +; .byte 0x0F, 0x30
>
> +;-----------------------
> +;; This is what PC BIOS is setting. -- P6STMT.
> +; add VIDEO BIOS cacheable!!!!
> +;-----------------------
> +; Fixed Range C0--C8
> +;mov ECX,#0x268
> +;mov EDX,#0x05050505 
> +;mov EAX,#0x05050505 
> +;wrmsr
> +;-----------------------
> +; Fixed Range C8--CF
> +;mov ECX,#0x269
> +;mov EDX,#0x0 
> +;mov EAX,#0x05050505 
> +;wrmsr
> +;-----------------------
>
> +;-----------------------------------------------------
> +; III) tell BOCHS' BIOS we want to boot from hdd.
> +; 0x00 - floppy
> +; 0x02 - hdd
> +; It's changed now //With El Torito enabled
> +; 0x0 - none
> +; 0x1 - floppy
> +; 0x2 - hdd
> +; 0x3 - cdrom
> +; i.e., 0x23 means try the cdrom first, then the hdd
> +; In future there will be 'fd failover'option in bochs.
>
> +mov  al, #0x3d ;; cmos_reg
> +out  0x70, al
> +mov  al, #0x23 ;; val (cd then hdd)
> +out  0x71, al
>
> +;-----------------------------------------------------
> +; IV) tell BOCHS' BIOS length of our mem block @ 1mb.
> +;     This is for Int 15 / EAX=E820
> +;     119mb = 0x77 00 00 00 
> +;     (this is for 128mb of ram)
> +;     (FIXME: this value is currently hard coded)
> +;     (it should be being passed from coreboot )
>
> +; for WinFast  6300
> +; 07 70 = 0770
> +; 06 80 = 0770 - 00F0		<< ALT (for unpatched bochs)
>
> +; for P6STMT - 10kb less ram
> +; 077F - 10     = 07 6F 
> +; 07 6F - 00 F0 = 06 7F
>
> +mov  al, #0x35 ;; cmos_reg
> +out  0x70, al
> +mov  al, #0x06 ;; val 
> +out  0x71, al
>
> +mov  al, #0x34 ;; cmos_reg
> +out  0x70, al
> +mov  al, #0x7F ;; val 
> +out  0x71, al
>
> +mov  al, #0x31 ;; cmos_reg
> +out  0x70, al
> +mov  al, #0x00 ;; val 
> +out  0x71, al
>
> +mov  al, #0x30 ;; cmos_reg
> +out  0x70, al
> +mov  al, #0x00 ;; val 
> +out  0x71, al
>
> +;-----------------------------------------------------
> +; V) tell BOCHS' BIOS we want to have LBA translation.
> +; 0x00 - NONE
> +; 0x01 - LBA    <<<<
> +; 0x02 - LARGE
> +; 0x03 - R-CHS
> +; In future there will be 'fd failover'option in bochs.
>
> +mov  al, #0x39 ;; cmos_reg
> +out  0x70, al
> +mov  al, #0x05 ;; val 5 = (LBA and LBA) 0 = none
> +out  0x71, al
>
> +;*****************************************************
> +nop
> +nop
> +;*****************************************************
> +; G) the switch -- protected to real mode
>
> +; IASDM, Vol 3
> +; (8-14) 8.8.2 Switching Back to Real-Address Mode
>
> +;=====================================================
> +; 1) disable interrupts
>
> +cli
>
> +;=====================================================
> +nop
> +;=====================================================
> +; 2) paging
>
> +;not enabled, so not applicable.
>
> +;=====================================================
> +; 3) setup CS segment limit (64kb)
> +; I)
>
> +lgdt [0x7C00+new_gdt]
>
> +;-----------------------------------------------------
> +; II)
>
> +jmp 0x08:0x7C00+new64lim
>
> +new64lim: nop
>
> +;=====================================================
> +nop
> +;=====================================================
> +; 4) setup all other segments
>
> +mov ax,  #0x10
> +mov ss,  ax
> +mov ds,  ax
> +mov es,  ax
> +mov fs,  ax
> +mov gs,  ax
>
> +;=====================================================
> +nop
> +;=====================================================
> +; 5) LIDT
> +; I)
>
> +; set up Real Mode IDT table (0...3FF)
>
> +; for BOCH's BIOS the address 0xF000:0xFF53 
> +; cantains value 0xCF which is IRET opcode.
>
> +; counter 
> +mov cx,  #0xFF ;1024 bytes(255 interrupts)(4*255=0x3FF)
>
> +; destination - 0x00000 = ES:EDI
> +mov ax,  #0x10        ; dst-segment - 2nd entry in GDT
> +mov es,  ax
> +mov eax, #0x00000     ; dst-offset  - 0x00000
> +mov edi, eax
>
> +; data to store -- 0xF000:FF53
> +mov eax, #0xF000FF53
>
> +; clear direction flag
> +cld
>
> +; the store 
> +rep
> stosd
>
> +;-----------------------------------------------------
> +; II)
> +; load interrupt descriptor table
>
> +lidt [0x7C00+new_idt]
>
> +;=====================================================
> +nop
> +nop
> +;=====================================================
> +; 6) clear the PE flag in CR0 register.
> +; I)
>
> +; switch to 16 bit segments
> +mov ax,  #0x20
> +mov ss,  ax
> +mov ds,  ax
> +mov es,  ax
> +mov fs,  ax
> +mov gs,  ax
>
> +;-----------------------------------------------------
> +; II)
>
> +; switch to 16 bit CS
>
> +jmp 0x018:0x7C00+new16bit
>
> +USE16
>
> +new16bit: nop
>
> +;-----------------------------------------------------
> +; III)
> +; the switch
>
> +;xor eax, eax
>
> +mov eax, cr0            
> +and eax, #0xFFFFFFFE
> +mov cr0, eax            ;switch to RM
>
> +;=====================================================
> +nop
> +nop
> +;=====================================================
> +; 7) far jump -- (to real mode address)
>
> +jmp 0x0:0x7C00+realcs
>
> +realcs: nop
>
> +;=====================================================
> +; 8) set all segment registers to 0's
>
> +mov ax,  #0x0
> +mov ss,  ax
> +mov ds,  ax
> +mov es,  ax
> +mov fs,  ax
> +mov gs,  ax
>
> +;=====================================================
> +; 9) re-enable interrupts
>
> +sti
>
> +;*****************************************************
> +nop
> +nop
> +;*****************************************************
> +; H) jump to BIOS.
>
> +jmp 0xFFFF:0x0000
> +;jmp 0xF000:0xFFF0
>
> +;*****************************************************
> +;*****************************************************
> +nop
> +nop
> +nop
> +nop
> +;*****************************************************
> +;*****************************************************
>
> +USE32
>
> +new_idt:
> +dw 0x03ff ;; limit 15:00
> +dw 0x0000 ;; base  15:00
> +dw 0x0000 ;; base  23:16
>
> +new_gdt:
> +dw 0x0028                     ;; limit 15:00
> +dw 0x7C00+new_gdt_table       ;; base  15:00
> +dw 0x0000                     ;; base  23:16
>
> +protected_gdt:
> +dw 0x0018                     ;; limit 15:00
> +dw 0x7C00+pmode_gdt_table     ;; base  15:00
> +dw 0x0000                     ;; base  23:16
>
> +;-----------------------------------------------------
>
> +new_gdt_table:
> +;//  1 2 3 4 
> +;//0
> +dd 0x00000000
> +dd 0x00000000
>
> +;//8
> +dd 0x0000ffff
> +dd 0x00409E00
>
> +;//10
> +dd 0x0000ffff
> +dd 0x00409200
>
> +;//18
> +dd 0x0000ffff
> +dd 0x00009a00
>
> +;//20
> +dd 0x0000ffff
> +dd 0x00009200
>
> +;-------------------------
>
> +pmode_gdt_table:
> +;//  1 2 3 4 
> +;//0
> +dd 0x00000000
> +dd 0x00000000
>
> +;//8
> +dd 0x0000ffff
> +dd 0x00CF9E00
>
> +;//10
> +dd 0x0000ffff
> +dd 0x00CF9200
>
> +;*****************************************************
> +;*****************************************************
> +; the file size must be 1024 bytes.
>
> +.org 0x400-1
> +; dd 0xdeadbeef			
> +db 0x0
>
> +;*****************************************************
> Index: packages/adlo/adlo/align.patch
> ===================================================================
> --- packages/adlo/adlo/align.patch	(revision 0)
> +++ packages/adlo/adlo/align.patch	(revision 0)
> @@ -0,0 +1,105 @@
> +--- loader.s	2008-02-13 12:12:04.000000000 -0700
> ++++ loader_4K.s	2008-04-11 15:57:01.000000000 -0600
> +@@ -2,7 +2,7 @@
> ; $Id: loader.s,v 1.1 2002/11/25 02:07:53 rminnich Exp $
> ;*****************************************************
> USE32
>
> +-; code it is loaded into memory at 0x7C00
> ++; code it is loaded into memory at 0x7000
> ;*****************************************************
> nop
> nop
>
> +@@ -19,12 +19,12 @@
> ;-----------------------------------------------------
> ; I)
>
> +-lgdt [0x7C00+protected_gdt]
> ++lgdt [0x7000+protected_gdt]
> ;-----------------------------------------------------
> ; II) setup CS
>
> +-jmp 0x08:0x7C00+newpgdt
> ++jmp 0x08:0x7000+newpgdt
> newpgdt: nop
>
> +@@ -67,7 +67,7 @@
> ; counter - 64kb.
> mov ecx, #0x10000
>
> +-; source - 0x8000  ( 0x7C00+0x400 = 0x8000 ) 
> ++; source - 0x8000  ( 0x7000+0x1000 = 0x8000 )
> mov ax,  #0x10        ; src-segment - 2nd entry in GDT
> mov ds,  ax
> mov eax, #0x8000      ; src-offset  - 0x8000
>
> +@@ -262,12 +262,12 @@
> ; 3) setup CS segment limit (64kb)
> ; I)
>
> +-lgdt [0x7C00+new_gdt]
> ++lgdt [0x7000+new_gdt]
> ;-----------------------------------------------------
> ; II)
>
> +-jmp 0x08:0x7C00+new64lim
> ++jmp 0x08:0x7000+new64lim
> new64lim: nop
>
> +@@ -317,7 +317,7 @@
> ; II)
> ; load interrupt descriptor table
>
> +-lidt [0x7C00+new_idt]
> ++lidt [0x7000+new_idt]
> ;=====================================================
> nop
>
> +@@ -339,7 +339,7 @@
> ; switch to 16 bit CS
>
> +-jmp 0x018:0x7C00+new16bit
> ++jmp 0x018:0x7000+new16bit
> USE16
>
> +@@ -361,7 +361,7 @@
> ;=====================================================
> ; 7) far jump -- (to real mode address)
>
> +-jmp 0x0:0x7C00+realcs
> ++jmp 0x0:0x7000+realcs
> realcs: nop
>
> +@@ -407,12 +407,12 @@
> new_gdt:
> dw 0x0028                     ;; limit 15:00
>
> +-dw 0x7C00+new_gdt_table       ;; base  15:00
> ++dw 0x7000+new_gdt_table       ;; base  15:00
> dw 0x0000                     ;; base  23:16
> protected_gdt:
> dw 0x0018                     ;; limit 15:00
>
> +-dw 0x7C00+pmode_gdt_table     ;; base  15:00
> ++dw 0x7000+pmode_gdt_table     ;; base  15:00
> dw 0x0000                     ;; base  23:16
> ;-----------------------------------------------------
>
> +@@ -457,10 +457,10 @@
> ;*****************************************************
> ;*****************************************************
>
> +-; the file size must be 1024 bytes.
> ++; the file size must be 4096 bytes.
>
> +-.org 0x400-1
> ++.org 0x1000-1
> ; dd 0xdeadbeef
> db 0x0
> Index: packages/adlo/adlo/COPYING
>
> --- packages/adlo/adlo/COPYING	(revision 0)
> +++ packages/adlo/adlo/COPYING	(revision 0)
> @@ -0,0 +1,340 @@
>     GNU GENERAL PUBLIC LICENSE
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> +
>    How to Apply These Terms to Your New Programs
> If you develop a new program, and you want it to be of the greatest
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> <one line to give the program's name and a brief idea of what it does.>
> Copyright (C) <year>  <name of author>
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> Gnomovision version 69, Copyright (C) year name of author
> Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
> This is free software, and you are welcome to redistribute it
> under certain conditions; type `show c' for details.
>
> +The hypothetical commands `show w' and `show c' should show the appropriate
> +parts of the General Public License.  Of course, the commands you use may
> +be called something other than `show w' and `show c'; they could even be
> +mouse-clicks or menu items--whatever suits your program.
>
> +You should also get your employer (if you work as a programmer) or your
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> +necessary.  Here is a sample; alter the names:
> Yoyodyne, Inc., hereby disclaims all copyright interest in the program
> `Gnomovision' (which makes passes at compilers) written by James Hacker.
> <signature of Ty Coon>, 1 April 1989
> Ty Coon, President of Vice
>
> +This General Public License does not permit incorporating your program into
> +proprietary programs.  If your program is a subroutine library, you may
> +consider it more useful to permit linking proprietary applications with the
> +library.  If this is what you want to do, use the GNU Library General
> +Public License instead of this License.
> Index: packages/adlo/adlo/CAST
> ===================================================================
> --- packages/adlo/adlo/CAST	(revision 0)
> +++ packages/adlo/adlo/CAST	(revision 0)
> @@ -0,0 +1,9 @@
> +Most of the analysis, design and implementation of the project was done by
> +me, Adam Sulmicki. I have received invaluable help from Adam Agnew. Bill
> +Arbaugh was the person who made it all possible.
>
> +I also received help from Christophe Bothamy, Bochs' developer, on all
> +Boch's bios related issues. Thanks!
>
> +I also got tips from Eric W. Biederman, as well as other members of the
> +coreboot mailing list.
> Index: packages/adlo/adlo/NEWS
> ===================================================================
> --- packages/adlo/adlo/NEWS	(revision 0)
> +++ packages/adlo/adlo/NEWS	(revision 0)
> @@ -0,0 +1,38 @@
> +initial release
> boots LILO
>
> +"linux_alpha" release
> fixed keyboard in lilo
> boots linux
> (must use "linux mem=100mb ro init=/bin/sh ")
>
> +"win2k" release
> lilo works
> no restrictions
> grub works
> no restrictions
> linux works
> no restrictions
> openbsd works
> no restrictions
> win2k
> no restrictions
> freebsd
> hangs at /sbin/init
> win98
> sometimes boots up to desktop
> winXP
> finish text mode bar, 
> switch to gfx mode 
> stop 7b 
>
> +"public" release
> just bit of cleanups, other than that same as
> "win2k" release.
> Index: packages/adlo/adlo/README
>
> --- packages/adlo/adlo/README	(revision 0)
> +++ packages/adlo/adlo/README	(revision 0)
> @@ -0,0 +1,231 @@
> +==========================================
> +$Id: README,v 1.1 2002/11/25 02:07:53 rminnich Exp $
> +==========================================
>
> +ADLO
> A project to combine coreboot and BOCHS BIOS to add support
> for booting legacy applications, such as Microsoft Windows.
>
> +==========================================
>
> +Boot Overvew:
> ADLO requires an boot loader with ELF support.
> In our case it is either coreboot or EtherBOOT.
> Sample execution paths:
>
> +coreboot -> ADLO -> LILO -> LINUX
>
> +coreboot -> EtherBOOT -> ADLO -> LILO -> LINUX
> Then it can start any real mode application.
> In our case it could be LILO or GRUB, but
> choices are not limited to this.
>
> +==========================================
>
> +ADLO overview:
> -Elf header
> -mainteance routines
> -bochs bios
> -vga bios
>
> +------------------------------------------
>
> +Elf header
> hand crafted binary. Currently there are 3 diff binaries
> for three different sizes of payload (65kb,113kb,129kb).
> they are catted at beginning of file
>
> +------------------------------------------
>
> +mainteance routines
> this is the loader.s file which gets compiled into loader.o binary
> it is catted 2nd right after elf header and it is where
> control is being transfered when the elf is executed.
> it consist of :
> -tuneups:
> 	select device to boot
> 	set memory for Int15/EAX=E820
> 	enable LBA
> 	copy coreboot table [TODO]
> -shadow : 
> 	enable/write/read
> -copy:
> 	bochs @ 0xF00000
> 	video bios (binary only) @ 0xC00000
> -switch
> 	from Real to Protected Mode
> -jump 
> 	jmp to the bios at 0xFFFF:0x0000
> we must have bios payload always at 1kb
> offset from start of ELF payload so loader.o
> must be always 1024 bytes.
>
> +------------------------------------------
>
> +BOCHS BIOS
> we have taken the boch's project and just extracted
> its bios from it only. it took us (so far) only
> minor modifications in order to make it work.
> basically it is the following directory in the
> bochs sources
> bochs-cvs/bochs/bios
> of all files there the rombios.c is the key file.
> Most of the times our patches are against current
> version of the rombios.c file. We try to feed back
> the patches to bochs maintainers so that's possible
> to use the bochs bios as is.
> the boch's related stuff are in bochs subdirectory.
> building boch's bios is as simple as
> cd bochs/bochs-cvs/bochs/bios
> make
> the resulting file rombios.bin is our bios image.
> 	-----
> At present time, it is recommended to use
> dev86-0.16.3 + my patch in order to compile
> bochs' bios. The dev86 package can be found
> at:
> http://www.cix.co.uk/~mayday/
> prepatched sources at:
> http://www.missl.cs.umd.edu/~adam/dev86-0.16.3-MSR.tgz
>
> +------------------------------------------
>
> +Video BIOS
> Video BIOS we use is binary only, so far.
> At the present time we are using the original
> Video BIOS as supplied from the system.
> To get the image simply type:
> make makevideobios
> The right thing will happen. For refernece the
> magic line in the Makefile is:
> videobios:
>    	dd if=/proc/kcore \
> of=./video.bios.bin \
> bs=1 count=65536 skip=790528
> ---------------
> We assume it is located at 0xC00000-0xE00000
> and we use 'dd and /proc/kcore to extract it
> (obviously it works as root only).
> Obviously it needs to be done with original
> (as shipped by manufactuer bios) so it should
> be done as the first step of the ADLO setup.
> ---------------
> The /proc/kcore is in ELF format (linux kernel
> 2.4.x and later) so if we want to get accurate
> image of ram we must skip the ELF header.
> The magic command is :
>  readelf -a /proc/kcore 
>
> +Program Headers:
> Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz
> NOTE           0x0007d4 0x00000000 0x00000000 0x005b0 0x00000
> LOAD           0x001000 0xc0000000 0x00000000 0xff60000 0xff60000
>             ^^^^^^^^
> There we look for the first LOAD section, and see what
> is its offset (for us it is 0x1000)
> ---------------
> 64KiB = 65536
> 0x0C 00 00 + 0x10 00 = 790528
> ---------------
> On technical note in our case video bios
> is just 48kb, but for paranoia sake we copy
> 64kb.
>
> +==========================================
>
> +Environment overview
>
> +ADLO is an ELF file and thus can be loaded either directly from 1)
> +coreboot, or 2) via EtherBOOT, or 3) via EtherBOOT+ AA patch for FS
> +support.
>
> +1)
> +Both coreboot and ADLO are on the same EEPROM chip. From end-user 
> +viewpoint it is probably the most similar to the bios classic.
> +(computer boots up and just loads whatever is in MBR).
>
> +2)
> +Set it up in /tftpboot directory on dhcp/tftp server and have it served
> +from there. (this is how we did the development)
>
> +3)
> +Use AA patch and put it as /kernel file and it will be then loaded by
> +etherboot from local hard disk.
>
> +------------------------------------------
>
> +Before ADLO starts.
> ADLO requires an boot loader with ELF support.
> In our case it is:
> -coreboot
> -coreboot and EtherBOOT
> -coreboot and EtherBOOT + AA polled I/O patch (w/ FS support).
> As little as coreboot only is required to get ADLO
> up and running.
> For development purposes it is recommended full set of
> coreboot + EtherBOOT and boot via DHCP/TFTP.
>
> +------------------------------------------
>
> +After ADLO finish.
> ADLO will attempt to locate the first hard disk
> and read MBR from it and execute.
> Then it can start any real mode application.
> In our case it could be LILO or GRUB
> but choices are not limited to this.
> In our case it would cause LILO to load
> (fully usable) and from there it was able to
> execute simple programs. so far the list
> of the program is limited to linux which
> runs somewhat. More to come in future.
>
> +==========================================
> Index: packages/adlo/adlo/Makefile
> ===================================================================
> --- packages/adlo/adlo/Makefile	(revision 0)
> +++ packages/adlo/adlo/Makefile	(revision 0)
> @@ -0,0 +1,42 @@
> +#-------------------------------------------------
> +# $Id: Makefile,v 1.2 2003/05/22 12:52:38 aip Exp $
> +#-------------------------------------------------
>
> +ELF065=elf/elf-header-065kb.payload
> +ELF068=elf/elf-header-068kb.payload
>
> +LOADER=loader
> +LOADER_4K=loader_4K
>
> +LOADERS= ${LOADER_4K}.o ${LOADER}.o
>
> +BOCHS_PATH=legacybios
>
> +BIOS=${BOCHS_PATH}/rom.bin
>
> +PAYLOAD=adlo.elf
> +PAYLOAD_KEXEC=adlo.aligned.elf
>
> +#-------------------------------------------------
>
> +all: ${LOADERS} ${BIOS}
> cat ${ELF065} ${LOADER}.o ${BIOS} > ${PAYLOAD}
> cat ${ELF068} ${LOADER_4K}.o ${BIOS} > ${PAYLOAD_KEXEC}
>
> +#-------------------------------------------------
>
> +${LOADER}.o: ${LOADER}.s
> as86 $< -b $@
>
> +${LOADER_4K}.s: ${LOADER}.s
> patch $< -o $@ < align.patch
>
> +${LOADER_4K}.o: ${LOADER_4K}.s
> as86 $< -b $@
>
> +#-------------------------------------------------
>
> +clean:
> rm -rf *.o ${PAYLOAD} ${PAYLOAD_KEXEC}
> rm -rf ${LOADER_4K}.s
> Index: packages/adlo/adlo.mk
>
> --- packages/adlo/adlo.mk	(revision 0)
> +++ packages/adlo/adlo.mk	(revision 0)
> @@ -0,0 +1,54 @@
> +ADLO_DIR=$(BUILD_DIR)/adlo
> +ADLO_SRC_DIR=$(ADLO_DIR)/adlo
> +ADLO_STAMP_DIR=$(ADLO_DIR)/stamps
> +ADLO_LOG_DIR=$(ADLO_DIR)/logs
>
> +ADLO_PATCHES=
>
> +ifeq ($(CONFIG_VERBOSE),y)
> +ADLO_FETCH_LOG=/dev/stdout
> +ADLO_BUILD_LOG=/dev/stdout
> +ADLO_INSTALL_LOG=/dev/stdout
> +else
> +ADLO_BUILD_LOG=$(ADLO_LOG_DIR)/build.log
> +ADLO_INSTALL_LOG=$(ADLO_LOG_DIR)/install.log
> +ADLO_FETCH_LOG=$(ADLO_LOG_DIR)/fetch.log
> +endif
>
> +# Make sure we have the tools we need to accomplish this
> +HAVE_AS86:=$(call find-tool,as86)
>
> +ifeq ($(HAVE_AS86),n)
> +$(error To build ADLO, you need to install as86, available in dev86)
> +endif
>
> +$(ADLO_STAMP_DIR)/.unpacked: | $(ADLO_STAMP_DIR) $(ADLO_DIR) $(ADLO_LOG_DIR)
> @ echo "Unpacking adlo..."
> @ cp -r $(PACKAGE_DIR)/adlo/adlo $(ADLO_DIR)
> @ ln -s $(LEGACYBIOS_SRC_DIR)/out/ $(ADLO_DIR)/adlo/legacybios
> @ touch $@
>
> +$(ADLO_SRC_DIR)/adlo.elf: $(ADLO_STAMP_DIR)/.unpacked $(LEGACYBIOS_SRC_DIR)/out/rom.bin
> @ echo "Building adlo..."
> @ make -C $(ADLO_SRC_DIR) > $(ADLO_BUILD_LOG) 2>&1
>
> +$(ADLO_STAMP_DIR)/.copied: $(ADLO_SRC_DIR)/adlo.elf
> @ mkdir -p $(shell dirname $(PAYLOAD_ELF))
> @ cp $(ADLO_SRC_DIR)/adlo.elf $(PAYLOAD_ELF)
> @ touch $@
>
> +$(ADLO_STAMP_DIR) $(ADLO_LOG_DIR):
> @ mkdir -p $@
>
> +adlo: $(ADLO_STAMP_DIR)/.copied
>
> +adlo-clean:
> @ echo "Cleaning adlo..."
> @ rm -f $(ADLO_STAMP_DIR)/.copied
>
> +ifneq ($(wildcard $(ADLO_SRC_DIR)/Makefile),)
> @ $(MAKE) -C $(ADLO_SRC_DIR) clean > /dev/null 2>&1
>
> +endif
>
> +adlo-distclean:
> @ rm -rf $(ADLO_DIR)/*
> Index: packages/legacybios/legacybios.mk
>
> --- packages/legacybios/legacybios.mk	(revision 0)
> +++ packages/legacybios/legacybios.mk	(revision 0)
> @@ -0,0 +1,56 @@
> +LEGACYBIOS_URL=http://linuxtogo.org/~kevin/legacybios/
> +LEGACYBIOS_TAG=0.2.0
>
> +LEGACYBIOS_DIR=$(BUILD_DIR)/legacybios
> +LEGACYBIOS_SRC_DIR=$(LEGACYBIOS_DIR)/legacybios-$(LEGACYBIOS_TAG)
> +LEGACYBIOS_STAMP_DIR=$(LEGACYBIOS_DIR)/stamps
> +LEGACYBIOS_LOG_DIR=$(LEGACYBIOS_DIR)/logs
>
> +LEGACYBIOS_PATCHES=
>
> +ifeq ($(CONFIG_VERBOSE),y)
> +LEGACYBIOS_FETCH_LOG=/dev/stdout
> +LEGACYBIOS_BUILD_LOG=/dev/stdout
> +LEGACYBIOS_INSTALL_LOG=/dev/stdout
> +else
> +LEGACYBIOS_BUILD_LOG=$(LEGACYBIOS_LOG_DIR)/build.log
> +LEGACYBIOS_INSTALL_LOG=$(LEGACYBIOS_LOG_DIR)/install.log
> +LEGACYBIOS_FETCH_LOG=$(LEGACYBIOS_LOG_DIR)/fetch.log
> +endif
>
> +LEGACYBIOS_TARBALL=legacybios-$(LEGACYBIOS_TAG).tar.gz
> +LEGACYBIOS_SOURCE=legacybios-$(LEGACYBIOS_TAG).tar.gz
>
> +ifeq ($(shell if [ -f $(PACKAGE_DIR)/legacybios/conf/customconfig--$(PAYLOAD)--$(COREBOOT_VENDOR)-$(COREBOOT_BOARD) ]; then echo 1; fi),1)
> LEGACYBIOS_CONFIG = customconfig--$(PAYLOAD)--$(COREBOOT_VENDOR)-$(COREBOOT_BOARD)
>
> +endif
>
> +$(SOURCE_DIR)/$(LEGACYBIOS_TARBALL):
> @ mkdir -p $(SOURCE_DIR)
> @ wget $(WGET_Q) -P $(SOURCE_DIR) $(LEGACYBIOS_URL)/$(LEGACYBIOS_SOURCE) --output-document=$(SOURCE_DIR)/$(LEGACYBIOS_TARBALL)
>
> +$(LEGACYBIOS_STAMP_DIR)/.unpacked: $(SOURCE_DIR)/$(LEGACYBIOS_TARBALL) | $(LEGACYBIOS_STAMP_DIR) $(LEGACYBIOS_DIR) $(LEGACYBIOS_LOG_DIR)
> @ echo "Unpacking legacybios..."
> @ tar -C $(LEGACYBIOS_DIR) -zxf $(SOURCE_DIR)/$(LEGACYBIOS_TARBALL)
> @ touch $@
>
> +$(LEGACYBIOS_SRC_DIR)/out/rom.bin: $(LEGACYBIOS_STAMP_DIR)/.unpacked
> @ echo "Building legacybios..."
> @ echo $(LEGACYBIOS_SRC_DIR)
> @ make -C $(LEGACYBIOS_SRC_DIR) > $(LEGACYBIOS_BUILD_LOG) 2>&1
>
> +$(LEGACYBIOS_STAMP_DIR) $(LEGACYBIOS_LOG_DIR):
> @ mkdir -p $@
>
> +legacybios: $(LEGACYBIOS_SRC_DIR)/out/rom.bin
>
> +legacybios-clean:
> @ echo "Cleaning legacybios..."
> @ rm -f $(LEGACYBIOS_STAMP_DIR)/.copied
>
> +ifneq ($(wildcard $(LEGACYBIOS_SRC_DIR)/Makefile),)
> @ $(MAKE) -C $(LEGACYBIOS_SRC_DIR) clean > /dev/null 2>&1
>
> +endif
>
> +legacybios-distclean:
> @ rm -rf $(LEGACYBIOS_DIR)/*
>