Move GDT to its own file.
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@ -45,61 +45,8 @@ stack_bottom:
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.skip 16384 # 16 KiB
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stack_top:
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/*
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* Create the GDT
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*/
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.section .data
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gdt_start:
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gdt_null:
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.long 0x0
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.long 0x0
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gdt_kcode:
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.word 0xFFFF # limit
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.word 0x0 # base
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.byte 0x0 # base
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.byte 0b10011010 # 1st flags | type flags
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.byte 0b11001111 # 2nd flags | limit
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.byte 0x0 # base
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gdt_kdata:
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.word 0xFFFF # limit
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.word 0x0 # base
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.byte 0x0 # base
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.byte 0b10010010 # 1st flags | type flags
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.byte 0b11001111 # 2nd flags | limit
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.byte 0x0 # base
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gdt_ucode:
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.word 0xFFFF # limit
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.word 0x0 # base
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.byte 0x0 # base
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.byte 0b11111010 # 1st flags | type flags
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.byte 0b11001111 # 2nd flags | limit
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.byte 0x0 # base
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gdt_udata:
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.word 0xFFFF # limit
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.word 0x0 # base
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.byte 0x0 # base
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.byte 0b11110010 # 1st flags | type flags
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.byte 0b11001111 # 2nd flags | limit
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.byte 0x0 # base
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# TODO: setup the TSS
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gdt_tss:
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.word 0x0 # size of TSS (set later)
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.word 0x0 # address of TSS (set later)
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.byte 0x0 # address of TSS (set later)
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.byte 0b10010001 # 1st flags | type flags
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.byte 0b01000000 # 2nd flags | size of TSS (set later
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.byte 0x0 # address of TSS (set later)
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gdt_end:
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gdtr:
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.word (gdt_end - gdt_start - 1)
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.long gdt_start
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.include "gdt.s"
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/*
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* The linker script specifies the `_start' label as the entry point to the kernel
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72
src/kernel/arch/x86/gdt.s
Normal file
72
src/kernel/arch/x86/gdt.s
Normal file
@ -0,0 +1,72 @@
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/*
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* Copyright (C) 2018 Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
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* Author: Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Create the GDT
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*/
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gdt_start:
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gdt_null:
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.long 0x0
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.long 0x0
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gdt_kcode:
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.word 0xFFFF # limit
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.word 0x0 # base
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.byte 0x0 # base
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.byte 0b10011010 # 1st flags | type flags
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.byte 0b11001111 # 2nd flags | limit
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.byte 0x0 # base
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gdt_kdata:
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.word 0xFFFF # limit
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.word 0x0 # base
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.byte 0x0 # base
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.byte 0b10010010 # 1st flags | type flags
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.byte 0b11001111 # 2nd flags | limit
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.byte 0x0 # base
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gdt_ucode:
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.word 0xFFFF # limit
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.word 0x0 # base
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.byte 0x0 # base
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.byte 0b11111010 # 1st flags | type flags
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.byte 0b11001111 # 2nd flags | limit
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.byte 0x0 # base
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gdt_udata:
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.word 0xFFFF # limit
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.word 0x0 # base
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.byte 0x0 # base
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.byte 0b11110010 # 1st flags | type flags
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.byte 0b11001111 # 2nd flags | limit
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.byte 0x0 # base
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# TODO: setup the TSS
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gdt_tss:
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.word 0x0 # size of TSS (set later)
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.word 0x0 # address of TSS (set later)
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.byte 0x0 # address of TSS (set later)
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.byte 0b10010001 # 1st flags | type flags
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.byte 0b01000000 # 2nd flags | size of TSS (set later
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.byte 0x0 # address of TSS (set later)
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gdt_end:
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gdtr:
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.word (gdt_end - gdt_start - 1)
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.long gdt_start
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