61 lines
1.7 KiB
Text
61 lines
1.7 KiB
Text
.load 0x1380
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@include <../bios_api.dss>
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.data
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$_drake_logo_line_1 " ___ ___ ___ __ ______"
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$_drake_logo_line_2 " / _ \/ _ \/ _ | / //_/ __/"
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$_drake_logo_line_3 " / // / , _/ __ |/ ,< / _/ "
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$_drake_logo_line_4 "/____/_/|_/_/ |_/_/|_/___/ "
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$_logo_padding " "
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.code
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mov R10, 0xE0
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int 0x30
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push 0
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call $_print_logo
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and FL, 0b1111111111111110 ## Disable interrupts
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mov FL, ACC
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push 0
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call $_load_boot_sector
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or FL, 0b0000000000000001 ## Enable interrupts
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mov FL, ACC
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jmp MemoryAddresses.RAM
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_infinite_loop:
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jmp $_infinite_loop
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hlt
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_print_logo:
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mov R5, $_drake_logo_line_1
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mov R6, 0
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mov ACC, 6
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_print_logo_loop:
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mov R10, 0x0C
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inc R6
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mov R9, $_logo_padding
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int 0x30
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mov R9, R5
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int 0x30
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mov R10, 0x02
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int 0x30
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addip R5, 29
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jls $_print_logo_loop, R6
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ret
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_load_boot_sector:
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movb [{MemoryAddresses.DISK_INTERFACE + 0x1}], 0x00 ## Mode = Read
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movb R1, [{ MemoryAddresses.CMOS + 0x10 }]
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movb [{MemoryAddresses.DISK_INTERFACE + 0x2}], R1 ## Disk = Default
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mov [{MemoryAddresses.DISK_INTERFACE + 0x3}],0x0000 ## Sector
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mov [{MemoryAddresses.DISK_INTERFACE + 0x5}],0x0400 ## Address
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mov [{MemoryAddresses.DISK_INTERFACE + 0x7}], 1024 ## Size
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mov [{MemoryAddresses.DISK_INTERFACE + 0x9}], MemoryAddresses.RAM ## MemoryAddress
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movb [MemoryAddresses.DISK_INTERFACE], 0x00 ## Signal = Start
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_load_boot_sector_block_wait_loop:
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mov ACC, [{MemoryAddresses.DISK_INTERFACE + 0xB}] ## Moving <Status> register into ACC
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jne $_load_boot_sector_block_wait_loop, 0x00 ## If <Status> register not Free, loop around and wait
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ret
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.fixed 512, 0x00
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