145 lines
2.4 KiB
Text
145 lines
2.4 KiB
Text
format binary
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use32
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org 0x100000
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MB_HEADER_MAGIC equ 0x1BADB002
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MB_PAGE_ALIGN equ (1 shl 0)
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MB_MEMORY_INFO equ (1 shl 1)
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MB_VIDEO_REQUEST equ (1 shl 2)
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MB_AOUT_KLUDGE equ (1 shl 16)
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MB_HEADER_FLAGS equ MB_PAGE_ALIGN or MB_MEMORY_INFO or MB_VIDEO_REQUEST
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MB_HEADER_FLAGS equ MB_PAGE_ALIGN or MB_MEMORY_INFO or MB_VIDEO_REQUEST or MB_AOUT_KLUDGE
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MB_CHECKSUM equ -(MB_HEADER_MAGIC + MB_HEADER_FLAGS)
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;; safe modes according to https://wiki.osdev.org/VESA_Video_Modes
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VWIDTH equ 80 ; 640/720
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VHEIGHT equ 25 ; 480
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VDEPTH equ 0 ; 24/32, zero in textmode
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multiboot:
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dd MB_HEADER_MAGIC
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dd MB_HEADER_FLAGS
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dd MB_CHECKSUM
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dd multiboot ; header address
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dd 0x100000 ; load address
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dd bss_start ; load end address
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dd bss_end ; bss end address
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dd start ; entry address
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dd 1 ; video mode_type (0:fb, 1:txt) (set flags[2]!)
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dd VWIDTH ; video width
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dd VHEIGHT ; video height
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dd VDEPTH ; video depth
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start:
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; Setup stack
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mov ebp, stack_top
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mov esp, stack_top
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;push ebx ; mboot info struct addr
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;push eax ; 0x2BADB002
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mov [mbootmagic], eax
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;mov [mbootaddr], ebx
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call con_disable_cursor
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call conclear
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mov esi, msg.roskainiting
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call conwriteln
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hang:
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;cli
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.loop:
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;hlt
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jmp .loop
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;give character in AL
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conputchar:
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mov ah, [txtbuf.col]
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mov dx, ax
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; dx has the whole character cell now
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xor eax, eax
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mov al, [txtbuf.y]
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mov bl, 25
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mul bl
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movzx bx, [txtbuf.x]
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add ax, bx
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add ax, ax
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add eax, 0xb8000
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mov [eax], dx
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cmp bl, 24
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je connewline
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inc bl
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mov [txtbuf.x], bl
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ret
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conwriteln:
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lodsb
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cmp al, 0
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je connewline
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call conputchar
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jmp conwriteln
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connewline:
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mov [txtbuf.x], 0
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mov al, [txtbuf.y]
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cmp al, 24
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je conscroll
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inc al
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mov [txtbuf.y], al
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ret
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conscroll:
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ret
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conclear:
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mov ecx, 80*25
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mov edi, 0xb8000
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mov ah, 0x07
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mov al, 0
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rep stosw
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mov [txtbuf.col], ah
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mov [txtbuf.x], 0
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mov [txtbuf.y], 0
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ret
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con_disable_cursor:
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mov dx, 0x3D4
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mov al, 0xA ; low cursor shape register
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out dx, al
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inc dx
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mov al, 0x20 ; bits 6-7 unused, bit 5 disables the cursor, bits 0-4 control the cursor shape
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out dx, al
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ret
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mbootaddr: dd 0
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mbootmagic: dd 0
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txtbuf:
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.x db 0
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.y db 0
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.col db 0x07 ;gray on black
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fb:
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.addr dd 0
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.pitch dd 0
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.width dd 0
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.height dd 0
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.depth db 0
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.bytespp db 0
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.rpos db 0
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;.rmasksize db 0
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.gpos db 0
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;.gmasksize db 0
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.bpos db 0
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;.bmasksize db 0
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msg:
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.roskainiting db "rOSka initializing...", 0
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align 4096
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bss_start:
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align 4096
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stack_bottom:
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rb 16384
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stack_top:
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bss_end:
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