201 lines
7.6 KiB
PHP
201 lines
7.6 KiB
PHP
;=----------------------------------------------------------------------------=;
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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 INCLUDED FUNCTIONS ;
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; (x86_64 architecture only) ;
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;=----------------------------------------------------------------------------=;
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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
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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:
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; XXX I don't think I'll implement this, but never know...;
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jmp .pLoop
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dump:
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;-----------------------------------------------------------------------;
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; x64/LM Dump 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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push rcx
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mov rcx, 512
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.pLoop:
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lodsb
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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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loop .pLoop
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pop rcx
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pop rdi
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pop rsi
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ret
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ata_read:
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;-----------------------------------------------------------------------;
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; x64/LM ATA Reading function ;
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; ;
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; ;
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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 rdx
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push rcx
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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, 1 ;Read one sector
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out dx, al
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mov dx, 0x1f3 ;Sector number port
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mov al, 1 ;Read sector one
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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, 20 ;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
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mov rdi, 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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pop rcx
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pop rdx
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pop rbx
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pop rax
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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, end
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call write
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ret
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buffer: times 512 db "_"
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end: db "[End of Sector]", 0x0
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