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Diffstat (limited to 'private/ntos/nthals/halx86/i386/ixbeep.asm')
| -rw-r--r-- | private/ntos/nthals/halx86/i386/ixbeep.asm | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/private/ntos/nthals/halx86/i386/ixbeep.asm b/private/ntos/nthals/halx86/i386/ixbeep.asm new file mode 100644 index 000000000..0722ca9df --- /dev/null +++ b/private/ntos/nthals/halx86/i386/ixbeep.asm @@ -0,0 +1,181 @@ + title "Hal Beep" +;++ +; +;Copyright (c) 1991 Microsoft Corporation +; +;Module Name: +; +; ixbeep.asm +; +;Abstract: +; +; HAL routine to make noise. It needs to synchronize its access to the +; 8254, since we also use the 8254 for the profiling interrupt. +; +; +;Author: +; +; John Vert (jvert) 31-Jul-1991 +; +;Revision History: +; +;-- + +.386p + .xlist +include hal386.inc +include callconv.inc ; calling convention macros +include i386\kimacro.inc +include mac386.inc + .list + + extrn _Halp8254Lock:DWORD + +; +; Defines used to program the i8254 for the speaker. +; + +I8254_TIMER_CONTROL_PORT EQU 43h +I8254_TIMER_DATA_PORT EQU 42h +I8254_TIMER_CLOCK_IN EQU 1193167 +I8254_TIMER_TONE_MAX EQU 65536 +I8254_TIMER_CONTROL_SELECT EQU 0B6h +SPEAKER_CONTROL_PORT EQU 61h +SPEAKER_OFF_MASK EQU 0FCh +SPEAKER_ON_MASK EQU 03h + +_TEXT$03 SEGMENT DWORD PUBLIC 'CODE' + ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING + + page ,132 + subttl "HalMakeBeep" +;++ +; +; BOOLEAN +; HalMakeBeep( +; IN ULONG Frequency +; ) +; +; Routine Description: +; +; This function sets the frequency of the speaker, causing it to sound a +; tone. The tone will sound until the speaker is explicitly turned off, +; so the driver is responsible for controlling the duration of the tone. +; +;Arguments: +; +; Frequency - Supplies the frequency of the desired tone. A frequency of +; 0 means the speaker should be shut off. +; +;Return Value: +; +; TRUE - Operation was successful (frequency within range or zero) +; FALSE - Operation was unsuccessful (frequency was out of range) +; Current tone (if any) is unchanged. +; +;-- + +Frequency equ [ebp + 8] + +cPublicProc _HalMakeBeep , 1 + + push ebp ; save ebp + mov ebp, esp ; + + push ebx ; save ebx +Hmb10: pushfd ; save flags + cli ; disable interrupts + +ifndef NT_UP + lea eax, _Halp8254Lock + ACQUIRE_SPINLOCK eax,Hmb99 +endif + + ; + ; Stop the speaker. + ; + + in al, SPEAKER_CONTROL_PORT + jmp $+2 + and al, SPEAKER_OFF_MASK + out SPEAKER_CONTROL_PORT, al + jmp $+2 + + ; + ; Calculate Tone: Tone = 1.193MHz / Frequency. + ; N.B. Tone must fit in 16 bits. + ; + + mov ecx, DWORD PTR [Frequency] ; ecx <- frequency + or ecx, ecx ; (ecx) == 0? + je SHORT Hmb30 ; goto Hmb30 + + mov eax, I8254_TIMER_CLOCK_IN ; eax <- 1.193MHz, the clockin + ; for the speaker tone + sub edx, edx ; edx <- zero + div ecx ; eax <- 1.193MHz / frequency + cmp eax, I8254_TIMER_TONE_MAX ; (eax) < 2**16? + jb SHORT Hmb20 ; goto Hmb20 + + ; + ; Invalid frequency. Return FALSE. + ; + + sub al, al + jmp SHORT Hmb40 +Hmb20: + ; + ; Program the 8254 with the calculated tone. + ; + + push eax ; save Tone + mov al, I8254_TIMER_CONTROL_SELECT + out I8254_TIMER_CONTROL_PORT, al ; select timer control register + jmp $+2 + + pop eax ; restore Tone + out I8254_TIMER_DATA_PORT, al ; program 8254 with Tone lsb + jmp $+2 + mov al, ah + out I8254_TIMER_DATA_PORT, al ; program 8254 with Tone msb + jmp $+2 + + ; + ; Turn the speaker on. + ; + + in al, SPEAKER_CONTROL_PORT + jmp $+2 + or al, SPEAKER_ON_MASK + out SPEAKER_CONTROL_PORT, al + jmp $+2 + +Hmb30: + ; + ; Return TRUE. + ; + + mov al, 1 + +Hmb40: +ifndef NT_UP + lea ebx, _Halp8254Lock + RELEASE_SPINLOCK ebx +endif + + popfd + pop ebx ; restore ebx + pop ebp ; restore ebp + stdRET _HalMakeBeep + +ifndef NT_UP + +Hmb99: popfd + SPIN_ON_SPINLOCK eax,<Hmb10> + +endif + +stdENDP _HalMakeBeep + +_TEXT$03 ends + end |