mirror of
https://gitlab.os-k.eu/os-k-team/os-k.git
synced 2023-08-25 14:03:10 +02:00
Revert "The bug is now fixed. We can focus on the elf loader"
This reverts commit b67ba69246aec64fe29083099469874eb900da41.
This commit is contained in:
parent
91c57e49c6
commit
3d7288c459
8
Makefile
8
Makefile
@ -84,14 +84,6 @@ make_disk:
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@echo ${CL2}[make_disk]${CL} OK${CL3}
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testloader: loader
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@qemu-system-x86_64 -hda build/bin/disk.img -d cpu_reset,guest_errors,pcall,int -enable-kvm 2> qemu.log &
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@ndisasm $(OBJDIR)/boot/loader.bin -b 32 > loader_dism.asm
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testloader32: loader
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@qemu-system-i386 -hda build/bin/disk.img -d cpu_reset,guest_errors,pcall,int -enable-kvm 2> qemu.log &
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@ndisasm $(OBJDIR)/boot/loader.bin -b 32 > loader_dism.asm
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debugloader: loader
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@qemu-system-x86_64 -hda build/bin/disk.img -d cpu_reset,guest_errors,pcall,int -s -S -enable-kvm 2> qemu.log &
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@ndisasm $(OBJDIR)/boot/loader.bin -b 32 > loader_dism.asm
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46
boot/loader/cpu/cpu.asm
Normal file
46
boot/loader/cpu/cpu.asm
Normal file
@ -0,0 +1,46 @@
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Basic longmode CPU functions ;
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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 64]
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temporize:
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push rcx
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mov rcx, 2000
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.looping:
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nop
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nop
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nop
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loop .looping
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pop rcx
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ret
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bitemporize:
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push rcx
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mov rcx, 2000
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.looping:
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call temporize
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loop .looping
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pop rcx
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ret
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@ -44,7 +44,7 @@ Is64Bits:
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jz .no_64 ; If it's not set, there is no long mode
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ret
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.no_64:
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mov ax, "01" ; ERROR 01 : 64bits unsupported
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mov al, "2" ; ERROR 1 : 64bits unsupported
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jmp Error
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; ---------------------------------------------------------------------------- ;
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@ -66,5 +66,5 @@ Check_cpuid:
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je .no_cpuid
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ret
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.no_cpuid:
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mov ax, "02" ; ERROR 02 : CPUID UNSUPPORTED
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mov al, "1" ; ERROR 1 : CPUID UNSUPPORTED
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jmp Error
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159
boot/loader/io/ata.asm
Normal file
159
boot/loader/io/ata.asm
Normal file
@ -0,0 +1,159 @@
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Basic Read Only ATA Long mode Driver ;
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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 64]
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;; BPB
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%define OEMName bp+0x03 ; Disk label
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%define bytesPerSector bp+0x0b ; Bytes per sector
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%define sectorsPerCluster bp+0x0d ; Sectors per cluster
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%define reservedSectors bp+0x0e ; Reserved sectors
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%define fats bp+0x10 ; Number of fats
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%define rootDirEntries bp+0x11 ; Number of entries in root dir
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%define sectors bp+0x13 ; Logical sectors
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%define mediaType bp+0x15 ; Media descriptor byte
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%define fatSectors bp+0x16 ; Sectors per FAT
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%define sectorsPerTrack bp+0x18 ; Sectors per track
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%define heads bp+0x1a ; Number of sides/heads
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%define hiddenSectors bp+0x1c ; Hidden sectors
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%define hugeSectors bp+0x20 ; LBA sectors
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%define biosBootdrvNum bp+0x24 ; Bootdrv number
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%define reserved bp+0x25 ; This is not used
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%define bootSignature bp+0x26 ; Bootdrv signature
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%define volumeId bp+0x27 ; Volume ID
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%define volumeLabel bp+0x2b ; Volume Label
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%define fatTypeLabel bp+0x36 ; File system type
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;; GLOBAL DATA
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Bootdrv db 0
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ended db "[End of Sector]", 0x0A, 0x0A, 0x0D, 0x0
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buffer: times 513 db "_"
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;; TEXT
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ata_read:
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;-----------------------------------------------------------------------;
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; x64/LM ATA Reading function ;
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; bl : number of sectors to read XXX ;
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; bh : the first sector to read ;
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;-----------------------------------------------------------------------;
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; Technical infos about the ports (Intel Doc):
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;
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; Port Access Mode Misc
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;
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; 1f0 r/w Data register, the bytes of the disk itself
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; 1f1 r Error register that can be handled
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; 1f2 r/w Sector count, how many sectors to read
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; 1f3 r/w Sector number, the actual sector wanted
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; 1f4 r/w Cylinder low, cylinders is 0-1024
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; 1f5 r/w Cylinder high, this makes up the rest of the 1024
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; 1f6 r/w Drive/head
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; bit 7 = 1
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; bit 6 = 0
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; bit 5 = 1
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; bit 4 = 0 drive 0 select
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; = 1 drive 1 select
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; bit 3-0 head select bits
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; 1f7 r Status register
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; bit 7 = 1 controller is executing a command
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; bit 6 = 1 drive is ready
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; bit 5 = 1 write fault
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; bit 4 = 1 seek complete
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; bit 3 = 1 sector buffer requires servicing
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; bit 2 = 1 disk data read corrected
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; bit 1 = 1 index - set to 1 each revolution
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; bit 0 = 1 previous command ended in an error
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; 1f7 w Command register
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; commands:
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; 50h format track
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; 20h read sectors with retry
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; 21h read sectors without retry
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; 22h read long with retry
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; 23h read long without retry
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; 30h write sectors with retry
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; 31h write sectors without retry
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; 32h write long with retry
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; 33h write long without retry
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;
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push rax
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push rbx
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push rcx
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push rdx
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push rdi
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mov dx, 0x1f6 ; Drive and head port
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mov al, 0x0a0 ; Drive 0, head 0
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out dx,al
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mov dx, 0x1f2 ; Sector count port
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mov al, bl ; Read bl(s) sector
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out dx, al
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mov dx, 0x1f3 ; Sector number port
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mov al, bh ; Read from sector n°bh
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out dx, al
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mov dx, 0x1f4 ; Cylinder low port
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mov al, 0 ; Cylinder 0
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out dx, al
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mov dx, 0x1f5 ; Cylinder high port
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mov al, 0 ; The rest of the cylinder 0
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out dx, al
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mov dx, 0x1f7 ; Command port
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mov al, 0x20 ; Read with retry.
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out dx, al
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still_going:
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in al, dx
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test al, 8 ; This means the sector buffer requires
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;servicing.
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jz still_going ; Don't continue until the sector buffer
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;is ready.
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mov cx, 512/2 ; One sector /2 because it copies words
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mov rdi, QWORD buffer
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mov dx, 0x1f0 ; Data port - data comes in and out of here.
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rep insw
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pop rdi
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%ifdef DEBUG
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mov bl, 0x0F
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mov esi, buffer
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call dump
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mov bl, 0x0A
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mov esi, ended
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call write
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add qword [NextTRAM], 120 ; Cursor moving : 1120 = 80 * 2 * 7 lignes
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%else
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mov bl, 0x0A
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mov esi, Pass
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call write
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%endif
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pop rdx
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pop rcx
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pop rbx
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pop rax
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ret
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43
boot/loader/io/lmmem.asm
Normal file
43
boot/loader/io/lmmem.asm
Normal file
@ -0,0 +1,43 @@
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Basic Memory Long mode Functions ;
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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 64]
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;; GLOBAL DATA
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A20_OK db 0
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;; TEXT
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check_a20:
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cmp BYTE [A20_OK], 1
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je .A20Success
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mov bl, 0x0C
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mov esi, Fail
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call write
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jmp Die
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.A20Success:
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mov bl, 0x0A
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mov esi, Pass
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call write
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ret
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131
boot/loader/io/lmterm.asm
Normal file
131
boot/loader/io/lmterm.asm
Normal file
@ -0,0 +1,131 @@
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Basic Colored VGA Terminal Long mode Driver ;
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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 ;
|
||||
; it under the terms of the GNU General Public License as published by ;
|
||||
; 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, ;
|
||||
; 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. ;
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||||
; ;
|
||||
; You should have received a copy of the GNU General Public License ;
|
||||
; along with OS/K. If not, see <https://www.gnu.org/licenses/>. ;
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;=----------------------------------------------------------------------------=;
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;;VIDEO
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%define TRAM 0x0B8000 ; [T]ext[RAM]
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%define VRAM 0x0A0000 ; [V]ideo[RAM]
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;; GLOBAL DATA
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VGA_HEIGHT dq 0
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VIDEO_MODE dw 0
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VIDEO_MODE32 dw 0
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VGA_HEIGHT32 dw 0
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NextTRAM dq 0x0B8000 ; Last position of cursor
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VIDEO_MODE64 dq 0
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VGA_HEIGHT64 dq 0
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VGA_X dq 0
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;; TEXT
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[BITS 64]
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clear:
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;-----------------------------------------------------------------------;
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; x64/LM Clear Text Screen Function ;
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;-----------------------------------------------------------------------;
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mov qword [NextTRAM], TRAM
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mov edi, TRAM
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push rsi
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push rdi
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push rcx
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mov ah, 0
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mov al, 0
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mov rcx, 0x4000 ; traditionnal value
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rep stosw ; fill screen with al while cx > 0
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pop rcx
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pop rsi
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pop rdi
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ret
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write:
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;-----------------------------------------------------------------------;
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; x64/LM Text Printing Functions ;
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; bl : color code ;
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; esi : string address ;
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;-----------------------------------------------------------------------;
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mov edi, [NextTRAM] ; TRAM ADDRESS
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push rsi
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push rdi
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.pLoop:
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lodsb
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cmp al, 0 ; while @al, i.e. while we're not hitting '\0'
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je .pEnd
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cmp al, 0x0A ; LF
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je .lf
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cmp al, 0x0D ; CR
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je .cr
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stosb ; text subpixel
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mov al, bl
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stosb ; color subpixel
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add qword [NextTRAM], 0x2 ; Cursor moving
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add qword [VGA_X], 0x2 ; coord + 2 because 2 subpixels
|
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jmp .pLoop
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.pEnd:
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pop rdi
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pop rsi
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ret
|
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.lf:
|
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mov rax, [VGA_HEIGHT64]
|
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add [NextTRAM], rax ; Cursor moving
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add [NextTRAM], rax
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add edi, eax ; Address moving
|
||||
add edi, eax
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jmp .pLoop
|
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.cr:
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push rax
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mov rax, qword [VGA_X]
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sub qword [NextTRAM], rax ; pos = X + Y * VGA_HEIGHT64. Donc pos - X = début de ligne
|
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sub edi, edx
|
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mov qword [VGA_X], 0
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pop rax
|
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jmp .pLoop
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.scroll:
|
||||
; XXX I don't think I'll implement this, but never know...;
|
||||
jmp .pLoop
|
||||
|
||||
dump:
|
||||
;-----------------------------------------------------------------------;
|
||||
; x64/LM Dump 512 bytes of a buffer ;
|
||||
; bl : color code ;
|
||||
; esi : buffer address ;
|
||||
;-----------------------------------------------------------------------;
|
||||
mov edi, [NextTRAM] ; TRAM ADDRESS
|
||||
push rsi
|
||||
push rdi
|
||||
push rcx
|
||||
mov rcx, 512
|
||||
.pLoop:
|
||||
lodsb
|
||||
stosb ; text subpixel
|
||||
mov al, bl
|
||||
stosb ; color subpixel
|
||||
loop .pLoop
|
||||
pop rcx
|
||||
pop rdi
|
||||
pop rsi
|
||||
add qword [NextTRAM], 1000 ; Cursor moving : 1120 = 80 * 2 * 7 lignes
|
||||
ret
|
||||
@ -31,7 +31,7 @@
|
||||
|
||||
%include "boot/loader/multiboot/header.inc"
|
||||
|
||||
;; NORMAL ENTRY POINT, BUT A LITTLE BIT UNUSED SINCE WE NEVER USE IT BECAUSE...
|
||||
;; Normal entry point, but a little bit unused since we never use it because...
|
||||
_start:
|
||||
mov ax, cs ; correcting cs after the horrible far jump
|
||||
mov ds, ax ; hm... And ds too
|
||||
@ -40,7 +40,7 @@ _start:
|
||||
xor dl, dl
|
||||
jmp 0x0000:_loader ; pas sûr
|
||||
|
||||
;; MAGNIFICENT MULTIBOOT HEADER FOR GRUB ------------------------------------ ;;
|
||||
;; Magnificent multiboot header for GRUB ------------------------------------ ;;
|
||||
MB_header:
|
||||
align 4
|
||||
dd MB_HEADER_MAGIC
|
||||
@ -52,7 +52,7 @@ MB_header:
|
||||
dd 00 ; (bss) not necessary
|
||||
dd MB_start ; entry address GRUB will start at
|
||||
|
||||
;; MULTIBOOT POINT ENTRY FOR GRUB ------------------------------------------- ;;
|
||||
;; Multiboot entry point for Grub ------------------------------------------- ;;
|
||||
MB_start:
|
||||
mov esp, KERNEL_STACK ; Setup the stack
|
||||
push 0 ; Reset EFLAGS
|
||||
@ -65,22 +65,13 @@ MB_start:
|
||||
jmp Die ; Aufwiedersehen
|
||||
|
||||
;; THE HOLES ---------------------------------------------------------------- ;;
|
||||
|
||||
; ---------------------------------------------------------------------------- ;
|
||||
; Prints 'ERR:XX' where 'XX' is the str in AX ;
|
||||
; ---------------------------------------------------------------------------- ;
|
||||
Error:
|
||||
mov dword [0xb8000], 0x4f524f45
|
||||
mov dword [0xb8004], 0x4f3a4f52
|
||||
mov dword [0xb8008], 0x4f204f20
|
||||
mov byte [0xb800a], al
|
||||
mov byte [0xb800c], ah
|
||||
mov byte [0xb800d], 0x4f
|
||||
jmp Die
|
||||
|
||||
; ---------------------------------------------------------------------------- ;
|
||||
; Kills the mind of your computer to get it prostrated ;
|
||||
; ---------------------------------------------------------------------------- ;
|
||||
Die:
|
||||
cli
|
||||
hlt ; die nooooow
|
||||
@ -104,57 +95,24 @@ _loader:
|
||||
jmp lbegin
|
||||
|
||||
%include "boot/loader/multiboot/check.inc"
|
||||
%include "boot/loader/cpu/cpuid.inc"
|
||||
%include "boot/loader/mem/structures.inc"
|
||||
%include "boot/loader/mem/management.inc"
|
||||
|
||||
lbegin:
|
||||
call MB_check
|
||||
jmp lnext
|
||||
|
||||
%include "boot/loader/cpu/cpuid.inc"
|
||||
lnext:
|
||||
call Check_cpuid
|
||||
call Is64Bits
|
||||
call CheckA20
|
||||
jmp lnext2
|
||||
|
||||
%include "boot/loader/mem/structures.inc"
|
||||
lnext2:
|
||||
call Setup_paging
|
||||
call Go64
|
||||
jmp lnext3
|
||||
%include "boot/loader/mem/management.inc"
|
||||
|
||||
lgdt [GDT64.pointer]
|
||||
jmp GDT64.code:l64
|
||||
lnext3:
|
||||
mov dword [0xb8000], 0x2f4b2f4f
|
||||
ret
|
||||
|
||||
[BITS 64]
|
||||
%include "boot/loader/io/terminal.inc"
|
||||
%include "boot/loader/io/ata.inc"
|
||||
%include "boot/loader/cpu/cpu.inc"
|
||||
|
||||
Salut db 0x09, " Booting OS/K ", 0x09, 0x0A, 0x0D, 0x0
|
||||
ReadAttempt db 0x09, " Attempt to read a sector with ATA commands...", 0
|
||||
|
||||
l64:
|
||||
;; Some cleanup
|
||||
mov ax, 0
|
||||
mov ss, ax
|
||||
mov ds, ax
|
||||
mov es, ax
|
||||
mov fs, ax
|
||||
mov gs, ax
|
||||
|
||||
;; Hello world
|
||||
mov bl, 0x0A
|
||||
mov esi, Salut
|
||||
call write
|
||||
|
||||
;; Read ATA
|
||||
mov bl, 0x0F
|
||||
mov esi, ReadAttempt
|
||||
call write
|
||||
|
||||
call temporize
|
||||
|
||||
|
||||
|
||||
;; Reading a sector of the disk
|
||||
mov bl, 1
|
||||
mov bh, 1
|
||||
call ata_read
|
||||
|
||||
jmp Die
|
||||
|
||||
@ -87,22 +87,3 @@ Go64:
|
||||
|
||||
popa
|
||||
ret
|
||||
|
||||
; ---------------------------------------------------------------------------- ;
|
||||
; Checks if Grub has enabled A20 line ;
|
||||
; ---------------------------------------------------------------------------- ;
|
||||
CheckA20:
|
||||
pushad
|
||||
mov edi,0x112345 ;odd megabyte address.
|
||||
mov esi,0x012345 ;even megabyte address.
|
||||
mov [esi],esi ;making sure that both addresses contain diffrent values.
|
||||
mov [edi],edi ;(if A20 line is cleared the two pointers would point to the address 0x012345 that would contain 0x112345 (edi))
|
||||
cmpsd ;compare addresses to see if the're equivalent.
|
||||
popad
|
||||
jne .A20_on ;if not equivalent , A20 line is set.
|
||||
jmp .A20_err
|
||||
.A20_on:
|
||||
ret
|
||||
.A20_err:
|
||||
mov ax, "03" ; ERROR 03 : A20 line failed
|
||||
jmp Error
|
||||
|
||||
@ -28,20 +28,80 @@
|
||||
;; 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
|
||||
NULL_SELECTOR: ;; null selector within 64 bits
|
||||
dw GDT_LENGTH ; limit of GDT
|
||||
dw GDT64 ; linear address of GDT
|
||||
dd 0x0 ;
|
||||
|
||||
CODE_SELECTOR: ;; 32-bit code selector (ring 0)
|
||||
dw 0x0000FFFF ; Segment Limit
|
||||
db 0x0, 0x0, 0x0 ; Base Address
|
||||
db 10011010b ; |7|6|5|4|3|2|1|0|
|
||||
; | | | | | | | `----- 1 when segment used.
|
||||
; | | | | | | `------ 1 when writable.
|
||||
; | | | | | `------- 1 if "conformant". Don't know what is it... spectral ? xD
|
||||
; | | | | `-------- 1 always
|
||||
; | | | `--------- 1 for segment descriptor, 0 for system descriptor
|
||||
; | | `---------- DPL !!! 0 for ring 0
|
||||
; | `----------- DPL (2/2)
|
||||
; `------------ 1 if in physical memory, 0 if page fault
|
||||
db 11001111b ; |7|6|5|4|3|2|1|0|
|
||||
; | | | | | | | `----- Limit 16
|
||||
; | | | | | | `------ Limit 17
|
||||
; | | | | | `------- Limit 18
|
||||
; | | | | `-------- Limit 19
|
||||
; | | | `--------- available for use
|
||||
; | | `---------- 0 always
|
||||
; | `----------- size of data. 1 for 32bits
|
||||
; `------------ 0 if limit is in Bytes, 1 if it's in pages (4ko)
|
||||
db 0x0 ; Base Address
|
||||
|
||||
DATA_SELECTOR: ;; flat data selector (ring 0)
|
||||
dw 0x0000FFFF ; Segment Limit
|
||||
db 0x0, 0x0, 0x0 ; Base Address
|
||||
db 10010010b ; |7|6|5|4|3|2|1|0|
|
||||
; | | | | | | | `----- 1 when segment used.
|
||||
; | | | | | | `------ 1 when writable.
|
||||
; | | | | | `------- expansion direction. 1 for a LIFO
|
||||
; | | | | `-------- 1 always
|
||||
; | | | `--------- 1 for segment descriptor, 0 for system descriptor
|
||||
; | | `---------- DPL !!! 0 for ring 0
|
||||
; | `----------- DPL (2/2)
|
||||
; `------------ 1 if in physical memory, 0 if page fault
|
||||
db 10001111b ; |7|6|5|4|3|2|1|0|
|
||||
; | | | | | | | `----- Limit 16
|
||||
; | | | | | | `------ Limit 17
|
||||
; | | | | | `------- Limit 18
|
||||
; | | | | `-------- Limit 19
|
||||
; | | | `--------- available for use
|
||||
; | | `---------- 0 always
|
||||
; | `----------- size of data. 1 for 32bits
|
||||
; `------------ 0 if limit is in Bytes, 1 if it's in pages (4ko)
|
||||
db 0x0 ; Base Address
|
||||
|
||||
LONG_SELECTOR: ;; 64-bit code selector (ring 0)
|
||||
dw 0x0000FFFF ; Segment Limit
|
||||
db 0x0, 0x0, 0x0 ; Base Address
|
||||
db 10011010b ; |7|6|5|4|3|2|1|0|
|
||||
; | | | | | | | `----- 1 when segment used.
|
||||
; | | | | | | `------ 1 when writable.
|
||||
; | | | | | `------- 1 if "conformant". Don't know what is it... spectral ? xD
|
||||
; | | | | `-------- 1 always
|
||||
; | | | `--------- 1 for segment descriptor, 0 for system descriptor
|
||||
; | | `---------- DPL !!! 0 for ring 0
|
||||
; | `----------- DPL (2/2)
|
||||
; `------------ 1 if in physical memory, 0 if page fault
|
||||
db 10101111b ; |7|6|5|4|3|2|1|0|
|
||||
; | | | | | | | `----- Limit 16
|
||||
; | | | | | | `------ Limit 17
|
||||
; | | | | | `------- Limit 18
|
||||
; | | | | `-------- Limit 19
|
||||
; | | | `--------- available for use
|
||||
; | | `---------- 0 always
|
||||
; | `----------- size of data. 1 for 32bits
|
||||
; `------------ 0 if limit is in Bytes, 1 if it's in pages (4ko)
|
||||
db 0x0 ; Base Address
|
||||
GDT_LENGTH:
|
||||
|
||||
;; EMPTY PAGE TABLES (identity of the first 1GiB)
|
||||
ALIGN 4096
|
||||
|
||||
@ -31,5 +31,5 @@ MB_check:
|
||||
jne .no_MB
|
||||
ret
|
||||
.no_MB:
|
||||
mov ax, "01" ; ERROR 01 : No multiboot
|
||||
mov al, "0" ; ERROR 0 : No multiboot
|
||||
jmp Error
|
||||
|
||||
Binary file not shown.
Loading…
Reference in New Issue
Block a user