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Rev 7215 Rev 9942
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        ; === KERNEL FOUND. LOADING... ===
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        ; === KERNEL FOUND. LOADING... ===
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found_kernel_file:
 - 
 
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        mov     bp, [si+01ah]                   ; first cluster of kernel file
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found_kernel_file:
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        ;
- 
 
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        mov     [cluster1st+boot_program], bp   ; starting cluster of kernel file
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        mov     bp, [si+01ah]                   ; first cluster of kernel file
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        ; <\diamond>
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        mov     [cluster1st+boot_program], bp   ; starting cluster of kernel file
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        ; reading first FAT table
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        ; reading first FAT table
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        jae     execute_kernel
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        jae     execute_kernel
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        mov     bp, ax
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        mov     bp, ax
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        jmp     loop_obtains_kernel_data
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        jmp     loop_obtains_kernel_data
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execute_kernel:
 - 
 
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        ;
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execute_kernel:
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        mov     ax, 'KL'
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        mov     ax, 'KL'
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        push    0
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        push    0
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        pop     ds
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        pop     ds
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        mov     si, loader_block+boot_program
 - 
 
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        ;
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        mov     si, loader_block+boot_program
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        push    word seg_read_kernel
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        push    word seg_read_kernel
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        push    word 0
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        push    word 0
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read_sector:
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read_sector:
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        push    bp
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        push    bp
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        mov     bp, 20                          ; try 20 times
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        mov     bp, 20                                  ; try 20 times
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newread:
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newread:
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        dec     bp
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        dec     bp
- 
 
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        jnz     .next
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        cmp     ah, 02h                                 ; if read sectors
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        jz      file_error_message
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        jz      file_error_message
- 
 
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        mov     byte[write_err+boot_program], 1         ; if write sectors
- 
 
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        jmp     .ret
- 
 
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.next:
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        push    ax bx cx dx
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        push    ax bx cx dx
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        int     13h
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        int     13h
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        pop     dx cx bx ax
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        pop     dx cx bx ax
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        jc      newread
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        jc      newread
- 
 
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.ret:
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        pop     bp
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        pop     bp
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        retn
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        retn
- 
 
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;------------------------------------------
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;------------------------------------------
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        ; convert abs. sector number (AX) to BIOS T:H:S
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        ; convert abs. sector number (AX) to BIOS T:H:S
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        ; sector number = (abs.sector%BPB_SecPerTrk)+1
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        ; sector number = (abs.sector%BPB_SecPerTrk)+1
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        ; pre.track number = (abs.sector/BPB_SecPerTrk)
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        ; pre.track number = (abs.sector/BPB_SecPerTrk)
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        ; head number = pre.track number%BPB_NumHeads
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        ; head number = pre.track number%BPB_NumHeads
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kernel_name     db      'KERNEL  MNT ?',cr,lf,00h
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kernel_name     db      'KERNEL  MNT ?',cr,lf,00h
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FirstRootDirSecNum      dw      ?
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FirstRootDirSecNum      dw      ?
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RootDirSecs     dw      ?
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RootDirSecs     dw      ?
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data_start      dw      ?
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data_start      dw      ?
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 - 
 
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;
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write1st:
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write1st:
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        push    cs
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        push    cs
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        pop     ds
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        pop     ds
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        mov     byte [patchhere+1+boot_program], 3      ; change ah=2 to ah=3
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        mov     byte [patchhere+1+boot_program], 3      ; change ah=2 to ah=3
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        call    writesec
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        call    writesec
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        mov     byte [patchhere+1+boot_program], 2      ; change back ah=3 to ah=2
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        mov     byte [patchhere+1+boot_program], 2      ; change back ah=3 to ah=2
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        retf
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        retf
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cluster1st      dw      ?
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cluster1st      dw      ?
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loader_block:
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loader_block:
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                db      1
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                db      1                       ; +0
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                dw      0
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                dw      0                       ; +1
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                dw      write1st+boot_program
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                dw      write1st+boot_program   ; +3
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                dw      0
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                dw      0                       ; +5
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; <\diamond>
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write_err:      db      0                       ; +7
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times   0x1fe-$ db 00h
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times   0x1fe-$ db 00h