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https://github.com/Fennix-Project/Kernel.git
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64 lines
1.4 KiB
ArmAsm
64 lines
1.4 KiB
ArmAsm
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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.intel_syntax noprefix
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.code64
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.section .bootstrap.data
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/* Access bits */
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.equ A, 1 << 0
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.equ RW, 1 << 1
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.equ DC, 1 << 2
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.equ E, 1 << 3
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.equ S, 1 << 4
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.equ DPL0, 0 << 5
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.equ DPL1, 1 << 5
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.equ P, 1 << 7
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/* Flags bits */
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.equ LONG_MODE, 1 << 5
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.equ SZ_32, 1 << 6
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.equ GRAN_4K, 1 << 7
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.global GDT64.Null
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.global GDT64.Code
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.global GDT64.Data
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.global GDT64.Tss
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.global GDT64.Ptr
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GDT64:
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.equ GDT64.Null, $ - GDT64
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.quad 0
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.equ GDT64.Code, $ - GDT64
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.long 0xFFFF
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.byte 0
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.byte P | S | E | RW
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.byte GRAN_4K | LONG_MODE | 0xF
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.byte 0
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.equ GDT64.Data, $ - GDT64
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.long 0xFFFF
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.byte 0
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.byte P | S | RW
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.byte GRAN_4K | SZ_32 | 0xF
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.byte 0
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.equ GDT64.Tss, $ - GDT64
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.long 0x00000068
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.long 0x00CF8900
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GDT64.Ptr:
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.word $ - GDT64 - 1
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.quad GDT64
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