perhaps it would make sense to summarize "lessons learned" and send them to list, so that whoever will play with ADLO next can benefit from the knowledge
Ok,after Richard Smith's help ,I succeded in booting linux with VGA supported.
Mainboard: intel 440bx Video Card: S3 Trio64V+ (PCI card) And Richard said that he made Assiliant 65550 and 69000 PCI cards work and some S3 based cards work on 440bx mainboard. I had tried to use a ATI PCI card,but failed when the program run into VGA Bios ,and never return back.I also having problem on bringing up AGP video card,although I had set some registers about AGP enabling(maybe I hadn't set correctly,anyway, I don't care AGP too much now).
Prepare pirq,vga bios(get them from a running os),then use ADLO to copy them to proper address,maybe you need to modify loader.s about setting up shadowing.
Attached loader.s which was modified by Richard Smith sets up the shadowing correctly. I used it and succeeded,too.Thanks.
;***************************************************** ; $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: LinuxBIOS 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
; Outputs a value to PCI config space ; put the bus,dev,function,offset in eax ; and the byte value in dl then call this macro
MACRO PCI_CONFIG_WRITE_BYTE shl edx, #8 mov dl, al and dl, #3 shl edx, #16 or eax, #0x80000000 and eax, #0xfffffffc mov dx, #0x0cf8 out dx, eax shr edx, #16 mov al, dh mov dh, #0 add edx, #0x0cfc out dx, al MEND
;***************************************************** ; B) shadow - ON (enable/read/write)
; This is orginal shadowing setup code ; Works on the Matsonic 7308e mainboard ;mov eax, #0x80000070 ;mov dx, #0x0cf8 ;out dx, eax
;mov eax, #0xFFFFFFFF ;mov dx, #0x0cfc ;out dx, eax
; This enables shadowing for the 0x0f0000 - ; 0x0fffff range and the 0x0C0000 - 0x0cffff range ; for the 440bx chipset.
mov eax, #0x59 mov edx, #0x20 PCI_CONFIG_WRITE_BYTE mov eax, #0x5A mov edx, #0x22 PCI_CONFIG_WRITE_BYTE mov eax, #0x5b mov edx, #0x22 PCI_CONFIG_WRITE_BYTE
;***************************************************** 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 ;***************************************************** ; D) copy -- video bios
; on my system video bios is just 48KB (0x0C000) ; but just for paranoida we copy 64kb (0X10000)
; counter - 64kb mov ecx, #0x10000
; source - 0x18000 ( 0x8000+0x10000 = 0x18000 ) mov ax, #0x10 ; src-segment - 2nd entry in GDT mov ds, ax mov eax, #0x18000 ; src-offset - 0x18000 mov esi, eax
; destination - 0xC0000 mov ax, #0x10 ; dst-segment - 2nd entry in GDT mov es, ax mov eax, #0xC0000 ; dst-offset - 0xC0000 mov edi, eax
; clear direction flag cld
; the copy rep movsb
;***************************************************** nop nop ;***************************************************** ; E) copy -- pirq table
; on my system video bios is just 48KB (0x0C000) ; but just for paranoida we copy 64kb (0X10000)
; counter - 256kb -- 0x100 mov ecx, #0x100
; source - 0x7F00 ( 0x7C00+0x300 = 0x7F00 ) mov ax, #0x10 ; src-segment - 2nd entry in GDT mov ds, ax mov eax, #0x7F00 ; src-offset - 0x7F00 mov esi, eax
; destination - 0xFFD00 mov ax, #0x10 ; dst-segment - 2nd entry in GDT mov es, ax mov eax, #0xFFD00 ; dst-offset - 0xFD00 mov edi, eax
; clear direction flag cld
; the copy rep movsb
;***************************************************** nop nop ;***************************************************** ; X) copy -- LinuxBIOS table into safe place.
;; TODO. ;; Q1 : what is the size of table. ;; Q2 : where to copy? ;***************************************************** nop nop ;***************************************************** ; E) shadow - OFF (write)
mov eax, #0x59 mov edx, #0x30 PCI_CONFIG_WRITE_BYTE mov eax, #0x5A mov edx, #0x33 PCI_CONFIG_WRITE_BYTE mov eax, #0x5b mov edx, #0x33 PCI_CONFIG_WRITE_BYTE
;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 ; In future there will be 'fd failover'option in bochs.
mov al, #0x3d ;; cmos_reg out 0x70, al mov al, #0x02 ;; val (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 LinuxBIOS )
; 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, #0x01 ;; val (LBA) 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 ;***************************************************** ; G) 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.
; -0x100 b/c we put $PIR table here.
.org 0x400-1-0x100 ; dd 0xdeadbeef db 0x0
;*****************************************************
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Gerald Chiu