diff options
Diffstat (limited to 'boot/mbr.asm')
| -rw-r--r-- | boot/mbr.asm | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/boot/mbr.asm b/boot/mbr.asm index 8483705..4513100 100644 --- a/boot/mbr.asm +++ b/boot/mbr.asm @@ -10,7 +10,7 @@ ; ; * BOOT_DRIVE set ; -; * 52 sectors of our kernel loaded at KERNEL_OFFSET from floppy +; * X 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) @@ -45,12 +45,15 @@ ;;where we will load our kernel into memory and some ;;other memory locations ; -KERNEL_OFFSET equ 0x1000 +KERNEL_SECTOR equ 0x1000 +KERNEL_OFFSET equ 0x0000 + 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 + ; jmp boot_16 ;start boot process db 'X' @@ -94,22 +97,27 @@ CHECK_A20: [bits 16] ; boot_16: + + + + ;first of allsetup the stack (Right under mbr) + ;guaranteed ~30KB space + mov bp,0x07bff + mov sp,bp ; ; 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) +; ;Load the KERNEL (sectors starting at sector 2) + mov ax,KERNEL_SECTOR + mov es,ax mov bx,KERNEL_OFFSET - mov dh, 53 ; for lba mode this is hardcoded anyway + + mov dh, 53 ; for lba mode this is hardcoded anyway mov dl, [BOOT_DRIVE] call disk_load_16 @@ -160,7 +168,7 @@ boot_32_pm: ; call kernel! mov eax,0 ;booting processor - call KERNEL_OFFSET ;jump into our Kernel! + call 0x10000 ;KERNEL_SECTOR:KERNEL_OFFSET ;jump into our Kernel! ; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; |