stuff
This commit is contained in:
Adrien Bourmault
parent
cdd476ba7b
commit
d70d150da2
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Basic realmode CPU Detection ;
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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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; ---------------------------------------------------------------------------- ;
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; Checks if the CPU is compatible with 64-bits operating systems ;
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; If the 21th bit of the eax register is set, then CPUID is supported ;
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; We then test CPUID's result to see if long mode is supported ;
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; ---------------------------------------------------------------------------- ;
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Is64Bits:
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;; test if extended processor info in available
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mov eax, 0x80000000 ; implicit argument for cpuid
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cpuid ; get highest supported argument
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cmp eax, 0x80000001 ; it needs to be at least 0x80000001
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jb .no_64 ; if it's less, the CPU is too old for long mode
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;; use extended info to test if long mode is available
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mov eax, 0x80000001 ; argument for extended processor info
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cpuid ; returns various feature bits in ecx and edx
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test edx, 1 << 29 ; test if the LM-bit is set in the D-register
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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 al, "2" ; ERROR 1 : 64bits unsupported
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jmp Error
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; ---------------------------------------------------------------------------- ;
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; Check if CPUID is supported by flip the bit 21 (ID bit) in the FLAGS ;
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; register. If we can flip, CPUID is available. ;
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; ---------------------------------------------------------------------------- ;
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Check_cpuid:
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pushfd ; Copy FLAGS in to EAX via stack
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pop eax
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mov ecx, eax ; Copy to ECX as well for comparing later on
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xor eax, 1 << 21 ; Flip the ID bit
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push eax ; Copy EAX to FLAGS via the stack
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popfd
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pushfd ; Copy FLAGS back to EAX (with the flipped bit if CPUID is supported)
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pop eax
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push ecx ; flipping the flipped ID bit back if it was ever flipped like flipper
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popfd
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cmp eax, ecx ; VERITY MOMENT
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je .no_cpuid
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ret
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.no_cpuid:
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mov al, "1" ; ERROR 1 : CPUID UNSUPPORTED
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jmp Error
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@ -0,0 +1,54 @@
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Memory management from protected mode ;
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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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; ---------------------------------------------------------------------------- ;
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; Constructor for the page tables in protected mode ;
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; ---------------------------------------------------------------------------- ;
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Setup_paging:
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;; Map the first PML4 entry to PDP table
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mov eax, PDP_table
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or eax, 0b11 ; present + writable
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mov [PML4_table], eax
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;; Map the first PDP entry to PD table
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mov eax, PD_table
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or eax, 0b11 ; present + writable
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mov [PDP_table], eax
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;; Map each PD entry to a 'huge' 2MiB page
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mov ecx, 0 ; counter variable
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.map_p2_table:
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;; map ecx-th PD entry to a huge page that starts at address 2MiB*ecx
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mov eax, 0x200000
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mul ecx ; start address of ecx-th page
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or eax, 0b10000011 ; present + writable + huge
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mov [PD_table + ecx * 8], eax
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inc ecx
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cmp ecx, 512 ; if counter == 512, the whole PD table is mapped
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jne .map_p2_table ; else map the next entry
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ret
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@ -0,0 +1,113 @@
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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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;; GDT WITH DOC
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ALIGN 4
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GDT64:
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NULL_SELECTOR: ;; null selector within 64 bits
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dw GDT_LENGTH ; limit of GDT
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dw GDT64 ; linear address of GDT
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dd 0x0 ;
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CODE_SELECTOR: ;; 32-bit code selector (ring 0)
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dw 0x0000FFFF ; Segment Limit
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db 0x0, 0x0, 0x0 ; Base Address
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db 10011010b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- 1 when segment used.
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; | | | | | | `------ 1 when writable.
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; | | | | | `------- 1 if "conformant". Don't know what is it... spectral ? xD
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; | | | | `-------- 1 always
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; | | | `--------- 1 for segment descriptor, 0 for system descriptor
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; | | `---------- DPL !!! 0 for ring 0
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; | `----------- DPL (2/2)
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; `------------ 1 if in physical memory, 0 if page fault
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db 11001111b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- Limit 16
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; | | | | | | `------ Limit 17
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; | | | | | `------- Limit 18
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; | | | | `-------- Limit 19
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; | | | `--------- available for use
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; | | `---------- 0 always
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; | `----------- size of data. 1 for 32bits
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; `------------ 0 if limit is in Bytes, 1 if it's in pages (4ko)
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db 0x0 ; Base Address
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DATA_SELECTOR: ;; flat data selector (ring 0)
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dw 0x0000FFFF ; Segment Limit
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db 0x0, 0x0, 0x0 ; Base Address
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db 10010010b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- 1 when segment used.
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; | | | | | | `------ 1 when writable.
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; | | | | | `------- expansion direction. 1 for a LIFO
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; | | | | `-------- 1 always
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; | | | `--------- 1 for segment descriptor, 0 for system descriptor
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; | | `---------- DPL !!! 0 for ring 0
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; | `----------- DPL (2/2)
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; `------------ 1 if in physical memory, 0 if page fault
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db 10001111b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- Limit 16
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; | | | | | | `------ Limit 17
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; | | | | | `------- Limit 18
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; | | | | `-------- Limit 19
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; | | | `--------- available for use
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; | | `---------- 0 always
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; | `----------- size of data. 1 for 32bits
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; `------------ 0 if limit is in Bytes, 1 if it's in pages (4ko)
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db 0x0 ; Base Address
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LONG_SELECTOR: ;; 64-bit code selector (ring 0)
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dw 0x0000FFFF ; Segment Limit
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db 0x0, 0x0, 0x0 ; Base Address
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db 10011010b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- 1 when segment used.
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; | | | | | | `------ 1 when writable.
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; | | | | | `------- 1 if "conformant". Don't know what is it... spectral ? xD
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; | | | | `-------- 1 always
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; | | | `--------- 1 for segment descriptor, 0 for system descriptor
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; | | `---------- DPL !!! 0 for ring 0
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; | `----------- DPL (2/2)
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; `------------ 1 if in physical memory, 0 if page fault
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db 10101111b ; |7|6|5|4|3|2|1|0|
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; | | | | | | | `----- Limit 16
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; | | | | | | `------ Limit 17
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; | | | | | `------- Limit 18
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; | | | | `-------- Limit 19
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; | | | `--------- available for use
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; | | `---------- 0 always
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; | `----------- size of data. 1 for 32bits
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; `------------ 0 if limit is in Bytes, 1 if it's in pages (4ko)
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db 0x0 ; Base Address
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GDT_LENGTH:
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;; EMPTY PAGE TABLES (identity of the first 1GiB)
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ALIGN 4
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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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resb 4096
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@ -0,0 +1,35 @@
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Multiboot useful 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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; ---------------------------------------------------------------------------- ;
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; Multiboot check function to ensure we are launch by GRUB ;
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; ---------------------------------------------------------------------------- ;
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MB_check:
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cmp ecx, MB_GRUB_MAGIC ; The magic number must be in ecx
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jne .no_MB
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ret
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.no_MB:
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mov al, "0" ; ERROR 0 : No multiboot
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jmp Error
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@ -0,0 +1,34 @@
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Desc: Multiboot header ;
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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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;; MULTIBOOT HEADER
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MB_AOUT_KLUDGE equ 1 << 16 ; We are not an ELF executable
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MB_ALIGN equ 1 << 0 ; Ask to align loaded modules on page boundaries
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MB_MEMINFO equ 1 << 1 ; Ask to provide memory map
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MB_HEADER_MAGIC equ 0x1badb002
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MB_GRUB_MAGIC equ 0x2badb002
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MB_HEADER_FLAGS equ MB_AOUT_KLUDGE|MB_ALIGN|MB_MEMINFO
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CHECKSUM equ -(MB_HEADER_MAGIC + MB_HEADER_FLAGS)
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KERNEL_STACK equ 0x00200000 ; Stack starts at the 2mb address & grows down
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