; ---- boot me! ----
; nasm -f bin -o bootcard.img bootcard.asm
; cat bootcard.img >/dev/<usbstick>
-; reboot
org 7c00h
bits 16
-data_start equ 7e00h
-nticks equ data_start
-muscur equ nticks + 4
-
-osc_freq equ 1193182
-PIT_DATA0 equ 40h
-PIT_DATA2 equ 42h
-PIT_CMD equ 43h
-PIT_CMD_CHAN0 equ 00h
-PIT_CMD_CHAN1 equ 40h
-PIT_CMD_CHAN2 equ 80h
-PIT_CMD_HILO equ 30h
-PIT_CMD_SQWAVE equ 06h
-KB_CTRL equ 61h
-
-%define DIV_ROUND(a, b) ((a) / (b) + ((a) % (b)) / ((b) / 2))
-
-%macro setcursor 2
- mov dl, %1
- mov dh, %2
+barh equ 4
+nbars equ 11
+barstart equ 200 - (nbars+1) * barh
+
+nticks equ 7e00h
+tmoffs equ 7e04h
+musptr equ 7e08h
+frame equ 7e0ch
+fval equ 7e10h
+cmap equ 7e14h
+
+%macro setcur 2
+ mov dx, %1 | (%2 << 8)
xor bx, bx
mov ah, 2
int 10h
%endmacro
%macro spkon 0
- in al, KB_CTRL
+ in al, 61h
or al, 3
- out KB_CTRL, al
+ out 61h, al
%endmacro
%macro spkoff 0
- in al, KB_CTRL
+ in al, 61h
and al, 0fch
- out KB_CTRL, al
+ out 61h, al
%endmacro
-%macro settimer 2
- mov al, (PIT_CMD_CHAN0 + (%1 << 6)) | PIT_CMD_HILO | PIT_CMD_SQWAVE
- out PIT_CMD, al
+%macro stimer 2
+ mov al, (%1 << 6) | 36h
+ out 43h, al
mov ax, %2
- out PIT_DATA0 + %1, al
+ out 40h + %1, al
mov al, ah
- out PIT_DATA0 + %1, al
+ out 40h + %1, al
%endmacro
- xor ax, ax
+start: xor ax, ax
mov ds, ax
+ mov es, ax
mov ss, ax
mov sp, 7c00h
- mov dword [nticks], 0
- mov dword [muscur], 0
- mov word [32], timer_intr
- mov word [34], 0
+ mov di, nticks
+ mov cx, 16
+ rep stosw
+
+ cli
+ mov word [32], tintr
+ mov [34], ax
- settimer 0, DIV_ROUND(osc_freq, 250)
+ stimer 0, 5966
mov ax, 13h
int 10h
- mov ax, 0a000h
- mov es, ax
-
- mov ax, 0303h
- mov cx, 32000
- xor di, di
- rep stosw
-
- setcursor 10, 12
+ push 0a000h
+ pop es
+
+
+ mov al, 16
+ mov di, barstart * 320
+ mov bx, nbars
+.drawbars:
+ mov cx, barh * 320
+ rep stosb
+ inc al
+ dec bx
+ jnz .drawbars
+
+ setcur 12, 16
mov si, str1
call textout
- setcursor 12, 13
- mov si, str2
- call textout
sti
-infloop:
- hlt
- jmp infloop
+mainloop:
+ mov dx, 3dah
+.invb: in al, dx
+ and al, 8
+ jnz .invb
+.novb: in al, dx
+ and al, 8
+ jz .novb
+
+drawbg:
+ mov bx, 200
+ xor di, di
+.fillgrad:
+ mov ax, bx
+ mov ah, al
+ mov cx, 2400 ; 15 lines
+ rep stosw
+ inc bx
+ cmp bx, 208
+ jnz .fillgrad
+
+ ; mountains
+ mov cx, 320
+ mov bp, sp
+.mnt: mov [bp - 2], cx
+ fild word [bp - 2]
+ fidiv word [w30]
+ fsincos
+ fiadd word [w5]
+ fimul word [w5]
+ fistp word [bp - 2]
+ fstp st0
+ mov bx, [bp - 2]
+ add bx, 84
+ imul bx, bx, 320
+ add bx, cx
+.mntcol:
+ mov byte [es:bx], 0
+ add bx, 320
+ cmp bx, 128 * 320
+ jb .mntcol
+
+ dec cx
+ jnz .mnt
+
+ ; upd colormap
+ mov dx, 3c8h
+ mov al, 16
+ out dx, al
+ inc dx
+ mov si, cmap
+ mov cx, 16 * 3
+ rep outsb
+
+ jmp mainloop
textout:
mov al, [si]
and al, al
jz .done
mov ah, 0eh
- mov bx, 0fh
+ mov bx, 82
int 10h
inc si
jmp textout
.done: ret
-timer_intr:
+
+tintr:
+ pusha
mov ax, [nticks]
inc ax
mov [nticks], ax
- mov bx, [muscur]
- shl bx, 2
- mov cx, [music + bx]
- cmp cx, 0ffffh
- jz .off
+ mov bx, [musptr]
+ cmp bx, 22*3
+ jnz .skiploop
+ xor bx, bx
+ mov [tmoffs], ax
+.skiploop:
+ xor cx, cx
+ mov cl, [music + bx]
+ shl cx, 4
+ sub ax, [tmoffs]
cmp ax, cx
- jb .eoi
+ jb .end
- inc dword [muscur]
- mov ax, [music + 2 + bx] ; grab timeout
+ mov ax, [music + 1 + bx]
+ add bx, 3
+ mov [musptr], bx
test ax, ax
jz .off
+
mov bx, ax
+ shr bx, 9
+ sub bx, 13
+ imul bx, bx, 3
+ mov byte [cmap + bx], 3fh
+ mov word [cmap + bx + 1], 2f2fh
- settimer 2, bx
+ mov bx, ax
+ stimer 2, bx
spkon
- jmp .eoi
+ jmp .end
.off: spkoff
+.end: test word [nticks], 1
+ jnz .eoi
+ mov cx, 16 * 3
+ mov si, cmap
+.fadecol:
+ lodsb
+ test al, al
+ jz .skipdec
+ dec al
+ mov [si-1], al
+.skipdec:
+ dec cx
+ jnz .fadecol
+
.eoi: mov al, 20h
- out 20h, al ; EOI
+ out 20h, al
+ popa
iret
-str1: db 'message message blah',0
-str2: db 'Michael & Athina',0
+str1: db 'Michael ',3,' Athena',0
+
+music: dd 0a2f8f00h, 0a11123a1h, 23a11423h, 28000023h, 0be322f8fh, 25c0391fh
+ dd 4b23a13ch, 8f500000h, 23a15a2fh, 641ab161h, 476e1ab1h, 1fbe751ch
+ dd 8223a178h, 0a18925c0h, 1fbe8c23h, 0aa0000a0h
+ dw 0
-music:
- dw 0, 500
- dw 10, 0
- dw 20, 2000
- dw 30, 0
- dw 40, 500
- dw 50, 0
- dw 60, 2000
- dw 70, 0
- dw 0ffffh, 0
+w5: dw 5
+w30: dw 30
times 446-($-$$) db 0
dd 00212080h
dd 0820280ch
dd 00000800h
dd 0001f800h
+
times 510-($-$$) db 0
dw 0aa55h
-
; vi:ft=nasm ts=8 sts=8 sw=8:
projects / bootcard / blobdiff