| 129,9 → 129,7 |
|---|
| |
| found_kernel_file: |
| mov bp, [si+01ah] ; first cluster of kernel file |
| ; <diamond> |
| mov [cluster1st+boot_program], bp ; starting cluster of kernel file |
| ; <\diamond> |
| |
| ; reading first FAT table |
| mov ax, word [BPB_RsvdSecCnt+boot_program] ; begin first FAT abs sector number |
| 184,12 → 182,10 |
|---|
| jmp loop_obtains_kernel_data |
| |
| execute_kernel: |
| ; <diamond> |
| mov ax, 'KL' |
| push 0 |
| pop ds |
| mov si, loader_block+boot_program |
| ; </diamond> |
| push word seg_read_kernel |
| push word 0 |
| retf ; jmp far 1000:0000 |
| 233,13 → 229,20 |
|---|
| mov bp, 20 ; try 20 times |
| newread: |
| dec bp |
| jnz .next |
| cmp ah, 02h ; if read sectors |
| jz file_error_message |
| mov byte[write_err+boot_program], 1 ; if write sectors |
| jmp .ret |
| .next: |
| push ax bx cx dx |
| int 13h |
| pop dx cx bx ax |
| jc newread |
| .ret: |
| pop bp |
| retn |
| |
| ;------------------------------------------ |
| ; convert abs. sector number (AX) to BIOS T:H:S |
| ; sector number = (abs.sector%BPB_SecPerTrk)+1 |
| 279,7 → 282,6 |
|---|
| RootDirSecs dw ? |
| data_start dw ? |
| |
| ; <diamond> |
| write1st: |
| push cs |
| pop ds |
| 293,11 → 295,11 |
|---|
| retf |
| cluster1st dw ? |
| loader_block: |
| db 1 |
| dw 0 |
| dw write1st+boot_program |
| dw 0 |
| ; <\diamond> |
| db 1 ; +0 |
| dw 0 ; +1 |
| dw write1st+boot_program ; +3 |
| dw 0 ; +5 |
| write_err: db 0 ; +7 |
| |
| times 0x1fe-$ db 00h |
| |