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Diffstat (limited to 'boot/acer/mbr.asm')
| -rw-r--r-- | boot/acer/mbr.asm | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/boot/acer/mbr.asm b/boot/acer/mbr.asm deleted file mode 100644 index b3ae034..0000000 --- a/boot/acer/mbr.asm +++ /dev/null @@ -1,167 +0,0 @@ -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; -; THE FOOL-BOOT-LOADER -; -; So we have just been loaded by the BIOS and are in 16-bits real mode! -; Now the following work will bee accomplished (chronologically): -; -; * BOOT_DRIVE set -; -; * 50 sectors of our kernel loaded at KERNEL_OFFSET from floppy -; -; * memory map made available at MEMMAP_OFFSET -; (check at MEMMEP_SIZE_OFFSET for number of entries) -; -; * the VESA mode specified by VESA_MODE_SELECT will be set up -; (check at VESA_MODES, and VESA_MODE_INFO -; for additional information) -; -; * interrupts disabled -; -; * 32-bit protected mode set up. -; -; * esp set to 0x90000 (Todo: take care of it!?) -; -; * A20 gate opened (Todo: really necessary?) -; -; * PICs configured -; -; * and finally we will jump into the C world to kernel_main() ! -; -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; - -;we want 16-bit instructions, before we switch to 32-bit protected mode. -[bits 16] - -;define origin of boot record in memory: 0x7c00 -;this is where the BIOS per definition will put the first -;512 bytes of data from the boot device -;The Boot record is identified by the last 2 magic bytes: 0xaa55 (?) -[org 0x7c00] - -;;define some constants -;;where we will load our kernel into memory and some -;;other memory locations -; -KERNEL_OFFSET equ 0x1000 -MEMMAP_SIZE_OFFSET equ 0x7c00+0x600 -MEMMAP_OFFSET equ 0x7c00+0x400 -VESA_MODES equ 0x8300 -VESA_MODE_INFO equ 0x8400 -VESA_MODE_SELECT equ 0x4114 -;VESA_MODE_SELECT equ 0x0 -; -jmp boot_16 ;start boot process -; -;;SOME Global Data, mainly info/error strings -BOOT_DRIVE: - db 0xff -STR_VERSION: - db "v0.3.1~",0 -VESA_CHECK1: - db " V1.",0 -VESA_CHECK2: - db " V2",0 -VESA_CHECK3: - db " V3",0 -CHECK_A20: - db " A20",0 -; -;;lets put our temporary GDT (Global Descriptor Table) here -;;kernel should move this away -%include "boot/GDT.asm" -; -;;include 16-bit real mode routines (print_string, disk_load, vesa_setup,check_a20) -%include "boot/disk_load_16.asm" -;%include "boot/check_a20_16.asm" -%include "boot/print_string_16.asm" -%include "boot/vesa_setup_16.asm" -; -;;include our routines for switching to 32-bit protected mode -%include "boot/pm.asm" -; -;;pic_setup mapping routing -%include "boot/pic.asm" -; -;;get memory map routine -%include "boot/memmap.asm" -; -;;;;;;;;; BOOT 16-bit real ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; -;;lets start -[bits 16] -; -boot_16: -; -; - mov bx, STR_VERSION - call print_string -; -; -; ;setup the stack - mov bp,0x8000 - mov sp,bp -; -; ;remember BOOT_DRIVE (as was set by BIOS) - mov [BOOT_DRIVE],dl -; -; ;Load the KERNEL (52 sectors starting at sector 2) - mov bx,KERNEL_OFFSET - mov dh, 52 - mov dl, [BOOT_DRIVE] - call disk_load - - mov bx, KERNEL_OFFSET - call print_string - -; -; ;get memory map from bios before we enter 32 bit protected mode - mov ax,0 ; set target address in es:di (0:offset) - mov es,ax - mov di,MEMMAP_OFFSET - call BiosGetMemoryMap ; this will also put the number of entries -; ; of the memory map at MEMMAP_SIZE_OFFSET -; -;a20check: -; -; mov bx, CHECK_A20 -; call print_string -; -; call check_a20 -; cmp ax,0 -; je a20check ;hang if a20 is disabled! -; -; ;VESA: also setup vesa stuff before entering 32 bit protected mode - call VesaSetup -; -; ;finally lets enter Protected mode!!! - call switch_to_pm -; -;;;;;;;;; BOOT 32-bit protected mode;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -[bits 32] -boot_32_pm: -; -;; we could do ALL This inside the kernel!!!!!! TODO -; -; ;enable A20 -; ;http://www.brokenthorn.com/Resources/OSDev9.html -; ;Method 3.1: Enables A20 through keyboard controller -; ;Not all keyboard controllers support this -; ;todo: check if this has any effect at all !?!? - mov al, 0xdd ; command 0xdd: enable a20 -; ;mov al, 0xdf ; command 0xdf: disable a20 - out 0x64, al ; send command to controller - -; -; ;pic setup - call pic_setup - -; - call KERNEL_OFFSET ;jump into our Kernel! -; -;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; -; -;so we get identified as MBR -times 510-($-$$) db 0x0 -dw 0xaa55 - |