; ---- boot me! ----
; nasm -f bin -o bootcard.img bootcard.asm
-; cat bootcard.img >/dev/<usbstickdevice>
+; cat bootcard.img >/dev/<usbstick>
; reboot
org 7c00h
bits 16
- xor ax, ax
+data_start equ 7e00h
+nticks equ data_start
+tmoffs equ nticks + 4
+muscur equ tmoffs + 4
+data_end equ muscur + 4
+
+backbuf_seg equ 1000h
+
+OSC_FREQ equ 1193182
+PIT_DATA0 equ 40h
+PIT_CMD equ 43h
+PIT_CMD_CHAN0 equ 00h
+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 dx, %1 | (%2 << 8)
+ xor bx, bx
+ mov ah, 2
+ int 10h
+%endmacro
+%macro spkon 0
+ in al, KB_CTRL
+ or al, 3
+ out KB_CTRL, al
+%endmacro
+%macro spkoff 0
+ in al, KB_CTRL
+ and al, 0fch
+ out KB_CTRL, al
+%endmacro
+%macro settimer 2
+ mov al, (PIT_CMD_CHAN0 + (%1 << 6)) | PIT_CMD_HILO | PIT_CMD_SQWAVE
+ out PIT_CMD, al
+ mov ax, %2
+ out PIT_DATA0 + %1, al
+ mov al, ah
+ out PIT_DATA0 + %1, al
+%endmacro
+
+start: xor ax, ax
mov ds, ax
+ mov es, ax
mov ss, ax
+ mov sp, 7c00h
+
+ mov di, data_start
+ mov cx, (data_end - data_start) / 2
+ rep stosw
+
+ mov word [32], timer_intr
+ mov [34], ax
+
+ settimer 0, DIV_ROUND(OSC_FREQ, 200)
mov ax, 13h
int 10h
+ push backbuf_seg
+ pop es
- mov ax, 0a000h
- mov es, ax
- mov ax, 0303h
+ sti
+
+mainloop:
+ call drawbg
+
+ push ds
+ push es
+ push es
+ pop ds
+ push 0a000h
+ pop es
+ xor di, di
+ xor si, si
mov cx, 32000
+
+ mov dx, 3dah
+.invb: in al, dx
+ and al, 8
+ jnz .invb
+.novb: in al, dx
+ and al, 8
+ jz .novb
+
+ rep movsw
+ pop es
+ pop ds
+
+ setcursor 10, 0
+ mov si, str1
+ call textout
+ setcursor 12, 1
+ mov si, str2
+ call textout
+
+ jmp mainloop
+
+drawbg:
+ mov bx, 200
+ mov di, 5120
+.fillgrad:
+ mov ax, bx
+ mov ah, al
+ mov cx, 2400 ; 15 lines
rep stosw
+ inc bx
+ cmp bx, 208
+ jnz .fillgrad
-infloop:
- hlt
- jmp infloop
+ ; 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]
+ ;fistp word [bp - 4]
+ mov bx, [bp - 2]
+ add bx, 100
+ imul bx, bx, 320
+ add bx, cx
+.mntcol:
+ mov byte [es:bx], 0
+ add bx, 320
+ cmp bx, 64000
+ jb .mntcol
+
+ dec cx
+ jnz .mnt
+
+ ret
- times 446-($-$$) db 0
- db 80h ; active partition
- db 20h ; start head
- db 21h ; start cylinder
- db 0 ; start sector
- db 0ch ; type
- db 28h ; last head
- db 20h ; last cylinder
- db 08h ; last sector
- dd 00000800h ; first lba
- dd 0001f800h ; number of sectors (lba)
+textout:
+ mov al, [si]
+ and al, al
+ jz .done
+ mov ah, 0eh
+ mov bx, 82
+ int 10h
+ inc si
+ jmp textout
+.done: ret
+
+timer_intr:
+ pusha
+ push ds
+ push word 0
+ pop ds
+ mov ax, [nticks]
+ inc ax
+ mov [nticks], ax
+
+ sub ax, [tmoffs]
+.pmus: mov bx, [muscur]
+ shl bx, 2
+ mov cx, [music + bx] ; event time
+ cmp cx, 0ffffh
+ jz .loop
+ cmp ax, cx
+ jb .eoi
+
+ inc word [muscur]
+ mov ax, [music + 2 + bx] ; event counter reload
+ test ax, ax
+ jz .off
+ mov bx, ax
+ settimer 2, bx
+ spkon
+ jmp .eoi
+
+.off: spkoff
+
+.eoi: mov al, 20h
+ out 20h, al ; EOI
+ pop ds
+ popa
+ iret
+
+.loop: neg cx
+ mov [muscur], cx
+ mov ax, [nticks]
+ mov [tmoffs], ax
+ jmp .pmus
+
+
+str1: db 'message message blah',0
+str2: db 'Michael & Athena',0
+
+G2 equ 12175
+C3 equ 9121
+D3 equ 8126
+B2 equ 9664
+F3 equ 6833
+E3 equ 7239
+
+%define TM(x) (40 + (x) * 4)
+
+music: dw 0, 0
+ dw TM(0), G2
+ dw TM(40), C3
+ dw TM(70), C3
+
+ dw TM(80), C3
+ dw TM(140), 0
+
+ dw TM(160), G2
+ dw TM(200), D3
+ dw TM(230), B2
+
+ dw TM(240), C3
+ dw TM(300), 0
+
+ dw TM(320), G2
+ dw TM(360), C3
+ dw TM(390), F3
+
+ dw TM(400), F3
+ dw TM(440), E3
+ dw TM(470), D3
+
+ dw TM(480), C3
+ dw TM(520), B2
+ dw TM(550), C3
+
+ dw TM(560), D3
+ dw TM(640), 0
+
+ dw TM(680), 0
+ dw 0ffffh, 0
+
+ times 446-($-$$) db 0
+ dd 00212080h
+ dd 0820280ch
+ dd 00000800h
+ dd 0001f800h
+w5: dw 5
+w30: dw 30
times 510-($-$$) db 0
dw 0aa55h
projects / bootcard / blobdiff