60 lines
1.0 KiB
PHP
60 lines
1.0 KiB
PHP
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GDT:
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dw .GDTEnd - .GDTStart - 1 ; GDT size
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dd .GDTStart ; GDT start
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.GDTStart:
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; Null descriptor (required)
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.NullDescriptor:
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dw 0x0000 ; Limit
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dw 0x0000 ; Base (low 16 bits)
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db 0x00 ; Base (mid 8 bits)
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db 00000000b ; Access
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db 00000000b ; Granularity
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db 0x00 ; Base (high 8 bits)
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; Unreal mode
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.UnrealCode:
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dw 0xFFFF ; Limit
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dw 0x0000 ; Base (low 16 bits)
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db 0x00 ; Base (mid 8 bits)
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db 10011010b ; Access
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db 10001111b ; Granularity
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db 0x00 ; Base (high 8 bits)
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.UnrealData:
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dw 0xFFFF ; Limit
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dw 0x0000 ; Base (low 16 bits)
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db 0x00 ; Base (mid 8 bits)
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db 10010010b ; Access
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db 10001111b ; Granularity
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db 0x00 ; Base (high 8 bits)
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; Protected mode
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.PmodeCode:
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dw 0xFFFF ; Limit
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dw 0x0000 ; Base (low 16 bits)
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db 0x00 ; Base (mid 8 bits)
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db 10011010b ; Access
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db 11001111b ; Granularity
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db 0x00 ; Base (high 8 bits)
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.PmodeData:
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dw 0xFFFF ; Limit
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dw 0x0000 ; Base (low 16 bits)
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db 0x00 ; Base (mid 8 bits)
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db 10010010b ; Access
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db 11001111b ; Granularity
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db 0x00 ; Base (high 8 bits)
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.GDTEnd:
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