os-k/boot/loader/mem/structures.inc

67 lines
3.0 KiB
PHP

;=----------------------------------------------------------------------------=;
; GNU GPL OS/K ;
; ;
; Desc: Memory Design Structures ;
; (x86_64 architecture only) ;
; ;
; ;
; Copyright © 2018-2020 The OS/K Team ;
; ;
; This file is part of OS/K. ;
; ;
; OS/K 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. ;
; ;
; OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. ;
;=----------------------------------------------------------------------------=;
[BITS 32]
extern kernelEnd
extern _bss
global newKernelEnd
global newStackEnd
global GDT64
[section .text]
KERNEL_STACK equ 1 * 1024 * 1024 ; 1MB of stack
newKernelEnd dq 0x0
newStackEnd dq 0x0
[section .rodata]
;; GDT WITH DOC
ALIGN 4096
GDT64:
;; Null selector within 64 bits
.null:
dq 0x0 ; Zero entry
;; 64-bit code selector (ring 0)
.code: equ $ - GDT64
dq (1<<43) | (1<<44) | (1<<47) | (1<<53)
; | | | |
; | | | `------ 64-bit selector
; | | `---------------- Present selector
; | `-------------------------- Descriptor type
; `------------------------------------ Executable segment
.pointer:
dw $ - GDT64 - 1
dq GDT64
;; EMPTY PAGE TABLES (identity of the first 4GiB)
[section .bss]
ALIGN 4096
PML4_table:
resb 4096
PDP_table:
resb 4096
PD_table:
resb 4096