diff options
| author | Michal Idziorek <m.i@gmx.at> | 2014-11-06 20:43:57 +0100 |
|---|---|---|
| committer | Michal Idziorek <m.i@gmx.at> | 2014-11-06 20:43:57 +0100 |
| commit | 1271f4f3e3891b1de2f810c2063490c4a71a2518 (patch) | |
| tree | e4d872454a8e2e1330fd16e8af360da3abe9bcd6 /boot/disk_load_16.asm | |
| parent | 2a30fa85fd50919aa45fac4b961cc9508732b62a (diff) | |
vdi target for virtualbox.
Diffstat (limited to 'boot/disk_load_16.asm')
| -rw-r--r-- | boot/disk_load_16.asm | 41 |
1 files changed, 35 insertions, 6 deletions
diff --git a/boot/disk_load_16.asm b/boot/disk_load_16.asm index ae34360..52912f4 100644 --- a/boot/disk_load_16.asm +++ b/boot/disk_load_16.asm @@ -108,13 +108,42 @@ disk_load_chs: pusha + ; get boot drive geometry + mov ah,8 + mov dl,[BOOT_DRIVE] + int 0x13 + + add dh,1 + and cl,0x3f + + mov [bpbSectorsPerTrack],cl + mov [bpbHeadsPerCylinder],dh + ; + + ;show geometry + mov al,dh + call print_hex_byte + + mov bx, STR_SPACE + call print_string + + mov al,cl + call print_hex_byte + + call print_nextline + popa + ; + + pusha + + mov bx,0x1800 ;target es:bx mov es,bx mov bx,0 next_sectors_chs: - jmp skip_debug + ;jmp skip_debug pusha mov bx, STR_SPACE @@ -132,7 +161,7 @@ disk_load_chs: mov bx, STR_SPACE call print_string - ;load and show next LBA numer + ;show next LBA numer mov ax,[LBA] mov al,ah call print_hex_byte @@ -171,7 +200,7 @@ disk_load_chs: call lba_to_chs ; and now READ it! - mov al,16 ;number of sectors to read + mov al,1 ;number of sectors to read mov dl,[BOOT_DRIVE] mov ah,0x02 ;BIOS read sector func @@ -180,15 +209,15 @@ disk_load_chs: jc disk_read_error mov bx,es - add bx,0x0200 - cmp bx,0x9e00 + add bx,0x0020 + cmp bx,0x9000 je disk_load_finish mov es,bx mov bx,0 mov ax,[LBA] - add ax,16 + add ax,1 mov [LBA],ax jmp next_sectors_chs |