diff options
Diffstat (limited to 'util/ADLO/loader.s')
| -rw-r--r-- | util/ADLO/loader.s | 461 |
1 files changed, 0 insertions, 461 deletions
diff --git a/util/ADLO/loader.s b/util/ADLO/loader.s deleted file mode 100644 index c01ea49013..0000000000 --- a/util/ADLO/loader.s +++ /dev/null @@ -1,461 +0,0 @@ -;***************************************************** -; $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 - 0xE0000 -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 -; 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 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, #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. - - -.org 0x400-1 -; dd 0xdeadbeef -db 0x0 - -;***************************************************** |