2019-03-06 20:05:18 +01:00
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Memory Design Structures ;
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; (x86_64 architecture only) ;
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; ;
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; ;
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; Copyright © 2018-2019 The OS/K Team ;
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; ;
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; This file is part of OS/K. ;
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; ;
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; OS/K 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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; OS/K 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 OS/K. If not, see <https://www.gnu.org/licenses/>. ;
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;=----------------------------------------------------------------------------=;
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[BITS 32]
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2019-03-25 23:10:06 +01:00
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extern kernelEnd
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2019-05-11 22:26:40 +02:00
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extern _bss
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2019-03-25 23:10:06 +01:00
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global newKernelEnd
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2019-05-09 10:52:36 +02:00
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global realKernelEnd
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2019-03-25 23:10:06 +01:00
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[section .text]
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KERNEL_STACK equ kernelEnd + 4096 * 2 * 1024 ; 8MB of stack
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newKernelEnd dq 0x0
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2019-05-09 10:52:36 +02:00
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realKernelEnd dq 0x0
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2019-05-11 22:26:40 +02:00
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2019-03-12 22:11:00 +01:00
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[section .rodata]
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2019-03-06 20:05:18 +01:00
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;; GDT WITH DOC
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2019-03-06 20:05:18 +01:00
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ALIGN 4096
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2019-03-06 20:05:18 +01:00
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GDT64:
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2019-03-06 20:05:18 +01:00
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;; Null selector within 64 bits
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.null:
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dq 0x0 ; Zero entry
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;; 64-bit code selector (ring 0)
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.code: equ $ - GDT64
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dq (1<<43) | (1<<44) | (1<<47) | (1<<53)
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; | | | |
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; | | | `------ 64-bit selector
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; | | `---------------- Present selector
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; | `-------------------------- Descriptor type
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; `------------------------------------ Executable segment
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.pointer:
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dw $ - GDT64 - 1
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dq GDT64
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2019-03-06 20:05:18 +01:00
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2019-03-25 23:10:06 +01:00
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2019-05-11 22:26:40 +02:00
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;; EMPTY PAGE TABLES (identity of the first 4GiB)
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2019-03-12 22:11:00 +01:00
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[section .bss]
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2019-03-06 20:05:18 +01:00
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ALIGN 4096
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2019-03-06 20:05:18 +01:00
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PML4_table:
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resb 4096
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PDP_table:
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resb 4096
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PD_table:
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2019-03-28 10:34:18 +01:00
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times MAX_MEMORY resb 4096
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