52 lines
1.8 KiB
Text
52 lines
1.8 KiB
Text
.load 0x0000 ## BIOS is mapped to address 0x0000 in memory
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@include <data.dss>
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## ============================= BIOS Program =============================
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.code
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movb [VGA_Registers.VIDEO_MODE], VGA_VideoModes.TEXT_SINGLE_COLOR ## Enable Text_Single_Color graphics mode
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mov FL, 0b0000000000000001 ## Zero the FL Register and enable interrupts
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movb [{MemoryAddresses.INT_VEC + (0x20 * 3)}], 0xFF ## Setting up int 0x20 handler
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mov [{MemoryAddresses.INT_VEC + (0x20 * 3) + 1}], $_int_20_handler ## --
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mov R10, 0x00 ## Setting up int 0x30 handler by using int 0x20 functionality
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mov R9, $_int_30_handler ## -Passing the handler's address
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mov R8, 0x30 ## -Passing the interrupt's code to setup
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int 0x20 ## -Calling int 0x20 with 0x00 as parameter, to set new handler up
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mov R10, 0x03
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mov R9, $_bios_name
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int 0x30
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mov R10, 0x01
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mov R9, 32
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int 0x30
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mov R10, 0x04
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mov R9, [$_bios_version_number_maj]
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int 0x30
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mov R10, 0x01
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mov R9, 46
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int 0x30
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mov R10, 0x04
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mov R9, [$_bios_version_number_min]
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int 0x30
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mov R10, 0x02
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int 0x30
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## MBR Loading
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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_mbr_data_block
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or FL, 0b0000000000000001 ## Enable interrupts
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mov FL, ACC
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## ----
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%low INST_BIOS_NODE_TOGGLE 0x00 ## Disable BIOS Mode before leaving the BIOS
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jmp MemoryAddresses.MBR ## Jump to start of MBR in memory
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hlt ## Just in case somehow execution reaches this point
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## ========================================================================
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@include <drivers.dss>
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@include <utils.dss>
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.fixed 4096, 0x00 ## BIOS Needs to be 4096 Bytes exactly
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