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Move GDT to its own file.

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This commit is contained in:
Nicolás A. Ortega Froysa
2018-03-22 10:50:58 +01:00
parent 75d2fa65a0
commit e74b55936b
2 changed files with 73 additions and 54 deletions
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55
src/kernel/arch/x86/boot.s
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@@ -45,61 +45,8 @@ stack_bottom:
.skip 16384 # 16 KiB
stack_top:
/*
* Create the GDT
*/
.section .data
gdt_start:
gdt_null:
.long 0x0
.long 0x0
gdt_kcode:
.word 0xFFFF # limit
.word 0x0 # base
.byte 0x0 # base
.byte 0b10011010 # 1st flags | type flags
.byte 0b11001111 # 2nd flags | limit
.byte 0x0 # base
gdt_kdata:
.word 0xFFFF # limit
.word 0x0 # base
.byte 0x0 # base
.byte 0b10010010 # 1st flags | type flags
.byte 0b11001111 # 2nd flags | limit
.byte 0x0 # base
gdt_ucode:
.word 0xFFFF # limit
.word 0x0 # base
.byte 0x0 # base
.byte 0b11111010 # 1st flags | type flags
.byte 0b11001111 # 2nd flags | limit
.byte 0x0 # base
gdt_udata:
.word 0xFFFF # limit
.word 0x0 # base
.byte 0x0 # base
.byte 0b11110010 # 1st flags | type flags
.byte 0b11001111 # 2nd flags | limit
.byte 0x0 # base
# TODO: setup the TSS
gdt_tss:
.word 0x0 # size of TSS (set later)
.word 0x0 # address of TSS (set later)
.byte 0x0 # address of TSS (set later)
.byte 0b10010001 # 1st flags | type flags
.byte 0b01000000 # 2nd flags | size of TSS (set later
.byte 0x0 # address of TSS (set later)
gdt_end:
gdtr:
.word (gdt_end - gdt_start - 1)
.long gdt_start
.include "gdt.s"
/*
* The linker script specifies the `_start' label as the entry point to the kernel

72
src/kernel/arch/x86/gdt.s Normal file
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@@ -0,0 +1,72 @@
/*
* Copyright (C) 2018 Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
* Author: Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Create the GDT
*/
gdt_start:
gdt_null:
.long 0x0
.long 0x0
gdt_kcode:
.word 0xFFFF # limit
.word 0x0 # base
.byte 0x0 # base
.byte 0b10011010 # 1st flags | type flags
.byte 0b11001111 # 2nd flags | limit
.byte 0x0 # base
gdt_kdata:
.word 0xFFFF # limit
.word 0x0 # base
.byte 0x0 # base
.byte 0b10010010 # 1st flags | type flags
.byte 0b11001111 # 2nd flags | limit
.byte 0x0 # base
gdt_ucode:
.word 0xFFFF # limit
.word 0x0 # base
.byte 0x0 # base
.byte 0b11111010 # 1st flags | type flags
.byte 0b11001111 # 2nd flags | limit
.byte 0x0 # base
gdt_udata:
.word 0xFFFF # limit
.word 0x0 # base
.byte 0x0 # base
.byte 0b11110010 # 1st flags | type flags
.byte 0b11001111 # 2nd flags | limit
.byte 0x0 # base
# TODO: setup the TSS
gdt_tss:
.word 0x0 # size of TSS (set later)
.word 0x0 # address of TSS (set later)
.byte 0x0 # address of TSS (set later)
.byte 0b10010001 # 1st flags | type flags
.byte 0b01000000 # 2nd flags | size of TSS (set later
.byte 0x0 # address of TSS (set later)
gdt_end:
gdtr:
.word (gdt_end - gdt_start - 1)
.long gdt_start