58 lines
1.3 KiB
PHP
58 lines
1.3 KiB
PHP
;gdt.inc
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;Author: Josh Holtrop
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;Date: 10/30/03
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;Modified: 03/02/04
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gdtr:
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dw gdt_end-gdt-1
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dd GDT_V
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gdt:
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dd 0
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dd 0
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KERNEL_CODE equ $-gdt
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dw 0xffff ;limit 15:0
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dw 0x0000 ;base 15:0
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db 0x00 ;base 23:16
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db 0x9A ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
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db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
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db 0x00 ;base 31:24
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KERNEL_DATA equ $-gdt
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dw 0xffff ;limit 15:0
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dw 0x0000 ;base 15:0
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db 0x00 ;base 23:16
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db 0x92 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
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db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
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db 0x00 ;base 31:24
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USER_CODE equ $-gdt
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dw 0xffff ;limit 15:0
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dw 0x0000 ;base 15:0
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db 0x00 ;base 23:16
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db 0xFA ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
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db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
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db 0x00 ;base 31:24
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USER_DATA equ $-gdt
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dw 0xffff ;limit 15:0
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dw 0x0000 ;base 15:0
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db 0x00 ;base 23:16
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db 0xF2 ;access ([P][DPL][1][Executable][Direction/Conforming][Writable/Readable][A])
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db 0xCF ;flags ([G][D/B][0][0]) / limit 19:16
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db 0x00 ;base 31:24
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TSS0_SEG equ $-gdt
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dw 0x67 ;limit 15:0
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dw 0 ;base 15:0
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db 0 ;base 23:16
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db 0xE9 ;access ([P][DPL][0][1][0][Busy][1])
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db 0x00 ;flags ([G][0][0][AVL]) / limit 19:16
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db 0 ;base 31:24
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gdt_end:
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