246 lines
6.8 KiB
NASM
246 lines
6.8 KiB
NASM
;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Authors: spectral` ;
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; NeoX ;
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; ;
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; Desc: Kernel (second stage) Loader for OS/K ;
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; (x86_64 architecture only) ;
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;=----------------------------------------------------------------------------=;
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%define DEBUG
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[BITS 16]
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[ORG 0x1000]
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mov ax, cs ; correcting cs after the horrible far jump
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mov ds, ax ; hm... And ds too
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mov es, ax ; And es because it is jealous
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mov [Bootdrv], dl
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xor dl, dl
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jmp 0x0000:main
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%include "boot/loader/cpu/cpuid.asm"
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%include "boot/loader/io/rmterm.asm"
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%include "boot/loader/io/rmmem.asm"
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main:
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;; compatibility check
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push si
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mov si, Init
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call PrintB
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pop si
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call Is64bits
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jc ErrorNo64
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push si
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mov si, Pass
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call PrintB
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pop si
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;; Enabling A20
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push si
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mov si, EnA20
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call PrintB
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pop si
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call set_a20
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push si
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mov si, Pass
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call PrintB
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pop si
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;; DISABLING CURSOR BLINKING AND GETTING INFOS
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call get_dimensions
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call disable_cursor
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;;GO GDT64
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cli ; disable interrupts
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lgdt [GDT64]
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;; ACTIVATE PROTECTED MODE
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mov eax, cr0
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or al, 1b ; PE = 1
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mov cr0, eax
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;; DISABLE PAGING
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mov eax, cr0
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and eax, 0x7FFFFFFF ; PG = 0
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; |0|111111111111111111111111111111
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; |
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; `------ Paging bit
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mov cr0, eax
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push dword [VIDEO_MODE]
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push dword [VGA_HEIGHT]
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jmp (CODE_SELECTOR-GDT64):main32
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;; THE HOLE ----------------------------------------------------------------- ;;
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ErrorNo64:
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mov si, NoLongMode
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call PrintB
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Die:
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cli
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hlt ; die nooooow
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jmp 0xF000:0xFFF0
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;; END OF THE HOLE ---------------------------------------------------------- ;;
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[BITS 32]
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main32:
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pop dword [VGA_HEIGHT32]
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pop dword [VIDEO_MODE32]
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;; VERIFY A20
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pushad
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mov edi,0x112345 ;odd megabyte address.
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mov esi,0x012345 ;even megabyte address.
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mov [esi],esi ;making sure that both addresses contain diffrent values.
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mov [edi],edi ;(if A20 line is cleared the two pointers would point to the address 0x012345 that would contain 0x112345 (edi))
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cmpsd ;compare addresses to see if the're equivalent.
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popad
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jne .A20_on ;if not equivalent , A20 line is set.
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mov WORD [A20_OK], 0
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jmp .A20_end
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.A20_on:
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mov BYTE [A20_OK], 1
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.A20_end:
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;; INITIALIZE PROTECTED MODE SEGMENT REGISTERS
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mov ax, DATA_SELECTOR-GDT64
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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;; ACTIVATE PHYSICAL ADRESS EXTENSION
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mov eax, cr4
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or eax, 100000b ; PAE = 1 = 4 Mo / page. 0 = 4 Ko
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mov cr4, eax
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;;cleanup
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mov edi, 0x70000
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mov ecx, 0x10000
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xor eax, eax
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rep stosd
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;;formatting
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mov dword [0x70000], 0x71000 + 7 ; first PDP table
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mov dword [0x71000], 0x72000 + 7 ; first page directory
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mov dword [0x72000], 0x73000 + 7 ; first page table
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mov edi, 0x73000 ; address of first page table
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mov eax, 7
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mov ecx, 256 ; number of pages to map (1 MB)
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.make_page_entries:
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stosd
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add edi, 4
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add eax, 0x1000
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loop .make_page_entries
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;; pointing pml4
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mov eax, 0x70000 ; Bass address of PML4
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mov cr3, eax ; load page-map level-4 base
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;; ACTIVATE LONG MODE
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mov ecx, 0xC0000080 ; address of MSR
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rdmsr ; read MSR
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or eax, 100000000b ; LME = 1. (Long Mode Enable)
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wrmsr ; write MSR
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;; ACTIVATE PAGING
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mov eax, cr0
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or eax, 0x80000000 ; make bit 31 (PG = Paging) to 1 :
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; |1|000000000000000000000000000000
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; |
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; `------ Paging bit
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mov cr0, eax
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push dword 0
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push dword [VIDEO_MODE]
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push dword 0
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push dword [VGA_HEIGHT]
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jmp (LONG_SELECTOR-GDT64):main64
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[BITS 64]
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;; DATA
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Init db "Booting OS/K !", 0x0D, 0x0A, 0x0D, 0x0A, 0x09, " Checking CPUID...",0
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CPUIDD db 0x09, " Checking CPUID...", 0
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EnA20 db 0x09, " Enabling A20 line...", 0
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%ifdef DEBUG
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ReadAttempt db 0x09, " Attempt to read a sector with ATA commands...", 0x0A, 0x0D, 0x0A, 0x0D, 0
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%else
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ReadAttempt db 0x09, " Attempt to read a sector with ATA commands...", 0
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%endif
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txt db 0x09, " Switching to Long Mode... ", 0
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EndOfLoader db "End of loader.bin. System will halt !", 0x0A, 0x0D, 0
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Reinit db "Booting OS/K !", 0x0D, 0x0A, 0x0D, 0x0A, 0
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Pass db " OK", 0x0A, 0x0D, 0
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Fail db " FAIL!", 0x0A, 0x0D, 0
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msg db "The system is now in x64 mode. Is this not beautiful ?", 0x0A, 0x0D, 0
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FileNotFound db "Second Stage Error : The Kernel was not found.", 0x0A, 0x0D, 0
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DiskError db "Second Stage Error : The Disk has crashed.", 0x0A, 0x0D, 0
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filename db "KERNEL BIN"
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%include "boot/loader/io/lmmem.asm"
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%include "boot/loader/io/lmterm.asm"
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%include "boot/loader/io/ata.asm"
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%include "boot/loader/cpu/cpu.asm"
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%include "boot/loader/fs/fat.asm"
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main64:
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pop qword [VGA_HEIGHT64]
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pop qword [VIDEO_MODE64]
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;; INITIALIZE STACK
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mov rsp, 0x9F000
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call clear
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;; Printing
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mov bl, 0x0B
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mov esi, Reinit
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call write
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mov bl, 0x0F
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mov esi, CPUIDD
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call write
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mov bl, 0x0A
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mov esi, Pass
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call write
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mov bl, 0x0F
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mov esi, EnA20
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call write
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call check_a20
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mov bl, 0x0F
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mov esi, txt
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call write
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mov bl, 0x0A
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mov esi, Pass
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call write
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mov bl, 0x0D
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mov esi, msg
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call write
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mov bl, 0x0F
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mov esi, ReadAttempt
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call write
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call temporize ; Temporized because the ATA drive must be ready
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mov bl, 1
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mov bh, 1
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call ata_read
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mov bl, 0x0D
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mov esi, EndOfLoader
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call write
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jmp Die
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times 6 db 0
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