Mercurial > sdl-ios-xcode
view src/audio/mint/SDL_mintaudiointerrupt.S @ 571:8e3ce997621c
Date: Thu, 16 Jan 2003 13:48:31 +0200
From: "Mike Gorchak"
Subject: All QNX patches
whole patches concerning QNX. Almost all code has been rewritten by Julian
and me. Added initial support for hw overlays in QNX and many many others
fixes.
P.S. This patches has been reviewed by Dave Rempel from QSSL and included in
SDL 1.2.5 distribution, which coming on 3rd party CD for newest 6.2.1
version of QNX, which will be available soon.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 20 Jan 2003 01:38:37 +0000 |
| parents | 1338c24e30cb |
| children |
line wrap: on
line source
/* * Audio interrupt routines * * Patrice Mandin */ .text .globl _SDL_MintAudio_Callback .globl _SDL_MintAudio_IntDma .globl _SDL_MintAudio_IntXbios .globl _SDL_MintAudio_IntGsxb .globl _SDL_MintAudio_mutex .globl _SDL_MintAudio_audiobuf .globl _SDL_MintAudio_numbuf .globl _SDL_MintAudio_audiosize /* How it works: - Audio is playing buffer #0 (resp. #1) - We must calculate a sample in buffer #1 (resp. #0) so we first call the callback to do it - Then we swap the buffers */ /*--- DMA 8 bits interrupt vector ---*/ .text _SDL_MintAudio_IntDma: /* Reenable interrupts, so other interrupts can work */ movew #0x2300,sr /* Clear service bit, so other MFP interrupts can work */ bclr #5,0xfffffa0f:w /* Check if we are not already running */ tstw _SDL_MintAudio_mutex bnes intdma_end notw _SDL_MintAudio_mutex /* Swap buffers */ moveml d0-d1/a0-a1,sp@- movel _SDL_MintAudio_numbuf,d0 movel _SDL_MintAudio_audiobuf,d1 eorl #1,d0 beqs intdma_buffer0 movel _SDL_MintAudio_audiobuf+4,d1 intdma_buffer0: movel d0,_SDL_MintAudio_numbuf /* Callback */ movel d1,sp@- jsr _SDL_MintAudio_Callback movel sp@+,d1 /* Modify DMA addresses */ lea 0xffff8900:w,a0 moveb d1,a0@(0x07) /* Start address */ rorl #8,d1 moveb d1,a0@(0x05) rorl #8,d1 moveb d1,a0@(0x03) swap d1 addl _SDL_MintAudio_audiosize,d1 moveb d1,a0@(0x13) /* End address */ rorl #8,d1 moveb d1,a0@(0x11) rorl #8,d1 moveb d1,a0@(0x0f) moveml sp@+,d0-d1/a0-a1 clrw _SDL_MintAudio_mutex intdma_end: rte /*--- Xbios interrupt vector ---*/ .text _SDL_MintAudio_IntXbios: /* Reenable interrupts, so other interrupts can work */ movew #0x2300,sr /* Clear service bit, so other MFP interrupts can work */ bclr #5,0xfffffa0f:w /* Check if we are not already running */ tstw _SDL_MintAudio_mutex bnes intxbios_end notw _SDL_MintAudio_mutex /* Swap buffers */ moveml d0-d2/a0-a2,sp@- movel _SDL_MintAudio_numbuf,d0 movel _SDL_MintAudio_audiobuf,a0 eorl #1,d0 beqs intxbios_buffer0 movel _SDL_MintAudio_audiobuf+4,a0 intxbios_buffer0: movel d0,_SDL_MintAudio_numbuf /* Callback */ moveml a0,sp@- jsr _SDL_MintAudio_Callback moveml sp@+,a0 /* Setbuffer xbios function */ movel _SDL_MintAudio_audiosize,d1 lea a0@(0,d1:l),a1 movel a1,sp@- movel a0,sp@- clrw sp@- movew #131,sp@- trap #14 lea sp@(12),sp moveml sp@+,d0-d2/a0-a2 clrw _SDL_MintAudio_mutex intxbios_end: rte /*--- GSXB interrupt vector ---*/ .text _SDL_MintAudio_IntGsxb: /* Check if we are not already running */ tstw _SDL_MintAudio_mutex bnes intgsxb_end notw _SDL_MintAudio_mutex /* Swap buffers */ moveml d0-d2/a0-a2,sp@- movel _SDL_MintAudio_numbuf,d0 movel _SDL_MintAudio_audiobuf,a0 eorl #1,d0 beqs intgsxb_buffer0 movel _SDL_MintAudio_audiobuf+4,a0 intgsxb_buffer0: movel d0,_SDL_MintAudio_numbuf /* Callback */ moveml a0,sp@- jsr _SDL_MintAudio_Callback moveml sp@+,a0 /* Setbuffer xbios function */ movel _SDL_MintAudio_audiosize,d1 lea a0@(0,d1:l),a1 movel a1,sp@- movel a0,sp@- clrw sp@- movew #131,sp@- trap #14 lea sp@(12),sp moveml sp@+,d0-d2/a0-a2 clrw _SDL_MintAudio_mutex intgsxb_end: rts /*--- Common variables ---*/ .data .even .comm _SDL_MintAudio_mutex,4 .even .comm _SDL_MintAudio_audiobuf,8 .even .comm _SDL_MintAudio_numbuf,4 .even .comm _SDL_MintAudio_audiosize,4