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Annotation of coherent/b/kernel/FWB/sdsounds.s, revision 1.1

1.1     ! root        1: /      sdsounds.s:
        !             2: /      various sounds  that support the speaking device driver
        !             3: 
        !             4:        .text
        !             5: 
        !             6: timer1:        pushf
        !             7:        cli
        !             8:        mov eax,$0
        !             9: outb $0x43
        !            10:        outb  $0xe0
        !            11:        inb $0x40
        !            12:        movb ah,al
        !            13:        outb $0xe0
        !            14:        inb $0x40
        !            15:        outb $0xe0
        !            16:        xchg al,ah
        !            17:        popf
        !            18:        ret
        !            19: 
        !            20: /      Wait for timer1, edx ticks
        !            21: t1wait:
        !            22: /      get initial value of timer 1
        !            23:        call timer1
        !            24:        xchg eax,ebx
        !            25: next_t1:
        !            26:        call timer1
        !            27:        xchg ebx,eax
        !            28:        sub eax,ebx
        !            29:        jnc ?nowrap
        !            30:        add eax,$11932
        !            31: ?nowrap:       sub edx,eax
        !            32:        jnc next_t1 / not yet finished
        !            33:        ret
        !            34: 
        !            35: /      C interface to the above routine
        !            36:        .globl sdpause
        !            37: sdpause:
        !            38:        push ebp
        !            39:        mov ebp,esp
        !            40:        mov edx,8[ebp]
        !            41:        push ebx
        !            42:        call t1wait
        !            43:        pop ebx
        !            44:        leave
        !            45:        ret
        !            46: 
        !            47: /      toggle the speaker.
        !            48: /      Do not change a thing if a tone is in progress.
        !            49: toggle:
        !            50:        pushf
        !            51:        cli
        !            52:        inb $0x61
        !            53:        test al,$1
        !            54:        jnz notgl / cannot interrupt a tone with a click
        !            55:        xor al,$2
        !            56:        outb $0x61
        !            57: notgl: popf
        !            58:        ret
        !            59: 
        !            60: /      the click of a character being put on the screen
        !            61:        .globl sdclick
        !            62: sdclick:
        !            63:        push ebx
        !            64:        call toggle
        !            65:        mov edx,sdtm_click
        !            66:        call t1wait
        !            67:        call toggle
        !            68: sndret:        pop ebx
        !            69:        ret
        !            70: 
        !            71:        .globl sdcrsnd
        !            72: sdcrsnd:  / the sound of a carriage return
        !            73:        push ebx
        !            74:        mov ebx,sdtm_topcr
        !            75: rs1:   call toggle
        !            76:        mov edx,ebx
        !            77:        push ebx
        !            78:        call t1wait
        !            79:        pop ebx
        !            80:        sub ebx,sdtm_inccr
        !            81:        cmp ebx,sdtm_botcr
        !            82:        ja rs1
        !            83:        jmp sndret
        !            84: 

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