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@ -32,18 +32,86 @@ relocated: |
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mov si, message ; Put address of the null-terminated string to output into 'si' |
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call print ; Call our string-printing routine |
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mov bx, [partition_1.start_LBA] |
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; Check for more than one active partition that we can start from. |
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xor bx, bx |
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xor cx, cx |
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mov ax, [partition_1.active_partition] |
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call dumpax |
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cli |
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hlt |
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cmp ax, 0x80 |
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jne check_p_2 |
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mov bx, 0x01 ; Partion 1 active |
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inc cx |
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check_p_2: |
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mov ax, [partition_2.active_partition] |
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cmp ax, 0x80 |
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jne check_p_3 |
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inc cx |
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mov bx, 0x02 ; Partion 2 active |
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check_p_3: |
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mov ax, [partition_3.active_partition] |
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cmp ax, 0x80 |
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jne check_p_4 |
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inc cx |
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mov bx, 0x03 ; Partion 3 active |
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check_p_4: |
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mov ax, [partition_4.active_partition] |
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cmp ax, 0x80 |
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jne eval_active_partion_number |
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inc cx |
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mov bx, 0x04 ; Partion 4 active |
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eval_active_partion_number: |
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cmp cx, 1 |
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je boot_partition: |
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; here goes wait call, for the user to enter debug mode. |
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; Wating for 2 seconds: |
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mov ah, 0x86 ; code for waiting interupt call |
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mov cx, 0x001e ; high count of microseconds |
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mov dx, 0x8480 ; low count |
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int 0x15 |
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.busy_wait_for_key: |
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xor ax, ax |
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mov ah, 0x01 ; BIOS call to wait for key |
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int 0x16 |
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mov bx, 1 |
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boot_partition: |
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; IMPORTANT bx, has to hold the value 1-4 for the partiotion that wanted to be booted. |
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mov ax, partition_1 |
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.loop: |
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cmp bx, 1 |
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je break |
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add ax, 0x10 |
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dec bx |
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jmp .loop |
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break: |
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add ax, 7 ; This is the offset to fetch the LBA start adress of the partition record |
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mov bx, [ax] ; first part of LBA |
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mov WORD [DAPACK.lba_addr_dw_low], bx |
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mov bx, [partition_1.start_LBA + 1] |
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inc ax ; next part |
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mov bx, [ax] |
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mov WORD [DAPACK.lba_addr_dw_low + 1], bx |
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mov bx, [partition_1.start_LBA + 2] |
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inc ax ; next part |
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mov bx, [ax] |
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mov WORD [DAPACK.lba_addr_dw_low + 2], bx |
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mov bx, [partition_1.start_LBA + 3] |
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inc ax ; next part |
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mov bx, [ax] |
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mov WORD [DAPACK.lba_addr_dw_low + 3], bx |
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mov WORD [DAPACK.blkcnt], 0x01 |
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mov WORD [DAPACK.db_addr_segment], 0x0000 |
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mov WORD [DAPACK.db_addr_offset], 0x7c00 |
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mov si, DAPACK ; address of "disk address packet" |
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mov si, DAPACK ; address of "disk address packet" |
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xor ax, ax |
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mov ah, 0x42 ; READ |
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mov dl, [disk_identifier] |
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int 0x13 |
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@ -194,8 +262,10 @@ message db 'SLRboot for SingOS! v0.2.0.3-exp',13,10,0 |
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;boot_system db 'Read SingOS from disk', 13, 10, 0 |
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;error_str db 'Error', 0 |
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;success_str db 'Success', 0 |
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boot_this_partition: dw 0 |
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disk_identifier db 0 |
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DAPACK: |
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.dap_Size: db 0x10 ; This is always 16 bytes (0x10) |
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.rev_byte: db 0x0 ; reserved byte, should always be zero |
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@ -217,7 +287,7 @@ partition_1: |
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.size db 0x00, 0xC8, 0x03, 0x00 |
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partition_2: |
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.active_partition db 0x00 |
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.active_partition db 0x80 |
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.start_CHS db 0x8C, 0x3E, 0x0F |
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.disk_type db 0x83 |
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.end_CHS db 0xFF, 0xFF, 0xFF |
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