diff options
Diffstat (limited to 'distrib/sdl-1.2.12/src/audio/mint/SDL_mintaudio_it.S')
| -rw-r--r-- | distrib/sdl-1.2.12/src/audio/mint/SDL_mintaudio_it.S | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.12/src/audio/mint/SDL_mintaudio_it.S b/distrib/sdl-1.2.12/src/audio/mint/SDL_mintaudio_it.S new file mode 100644 index 0000000..c751a59 --- /dev/null +++ b/distrib/sdl-1.2.12/src/audio/mint/SDL_mintaudio_it.S @@ -0,0 +1,281 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this library; if not, write to the Free + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + Sam Lantinga + slouken@libsdl.org +*/ + +/* + Audio interrupts + + Patrice Mandin, Didier Méquignon + */ + + .text + + .globl _SDL_MintAudio_Callback + + .globl _SDL_MintAudio_XbiosInterrupt + .globl _SDL_MintAudio_XbiosInterruptMeasureClock + .globl _SDL_MintAudio_Dma8Interrupt + .globl _SDL_MintAudio_StfaInterrupt + + .globl _SDL_MintAudio_mutex + .globl _SDL_MintAudio_audiobuf + .globl _SDL_MintAudio_numbuf + .globl _SDL_MintAudio_audiosize + .globl _SDL_MintAudio_clocktics + .globl _SDL_MintAudio_hasfpu + + .globl _SDL_MintAudio_stfa + +/* + 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 +*/ + +#define savptr 0x4a2 +#define savamt 0x46 + +/*--- Xbios interrupt vector to measure Falcon external clock ---*/ + +_SDL_MintAudio_XbiosInterruptMeasureClock: /* 1 mS */ + + btst #0,0xFFFF8901:w /* state DMA sound */ + beqs SDL_MintAudio_EndIntMeasure + addql #1,_SDL_MintAudio_clocktics +SDL_MintAudio_EndIntMeasure: + bclr #5,0xFFFFFA0F:w /* Clear service bit */ + rte + +/*--- Xbios interrupt vector ---*/ + +_SDL_MintAudio_XbiosInterrupt: + + /* 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 + bne SDL_MintAudio_XbiosEnd + notw _SDL_MintAudio_mutex + + /* Swap buffers */ + eorw #1,_SDL_MintAudio_numbuf + + moveml d0-d7/a0-a6,sp@- + + /* Save FPU if needed */ + tstw _SDL_MintAudio_hasfpu + beqs SDL_MintAudio_Xbios_nofpu1 + .chip 68060 + fsave sp@- + fmoveml fpcr/fpsr/fpiar,sp@- + fmovemx fp0-fp7,sp@- + .chip 68000 +SDL_MintAudio_Xbios_nofpu1: + + /* Callback */ + jsr _SDL_MintAudio_Callback + + /* Restore FPU if needed */ + tstw _SDL_MintAudio_hasfpu + beqs SDL_MintAudio_Xbios_nofpu2 + .chip 68060 + fmovemx sp@+,fp0-fp7 + fmoveml sp@+,fpcr/fpsr/fpiar + frestore sp@+ + .chip 68000 +SDL_MintAudio_Xbios_nofpu2: + + /* Reserve space for registers */ + subl #savamt,savptr + + /* Set new buffer */ + + moveq #0,d0 + movel _SDL_MintAudio_audiosize,d1 + + movew _SDL_MintAudio_numbuf,d0 + lsll #2,d0 + lea _SDL_MintAudio_audiobuf,a0 + movel a0@(d0:l),a1 + + lea a1@(d1:l),a2 + + movel a2,sp@- + movel a1,sp@- + clrw sp@- + movew #131,sp@- + trap #14 + lea sp@(12),sp + + /* Restore registers space */ + addl #savamt,savptr + + moveml sp@+,d0-d7/a0-a6 + + clrw _SDL_MintAudio_mutex +SDL_MintAudio_XbiosEnd: + rte + +/*--- DMA 8 bits interrupt vector ---*/ + +_SDL_MintAudio_Dma8Interrupt: + + /* 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 + bne SDL_MintAudio_Dma8End + notw _SDL_MintAudio_mutex + + /* Swap buffers */ + eorw #1,_SDL_MintAudio_numbuf + + moveml d0-d1/a0-a1,sp@- + + /* Save FPU if needed */ + tstw _SDL_MintAudio_hasfpu + beqs SDL_MintAudio_Dma8_nofpu1 + .chip 68060 + fsave sp@- + fmoveml fpcr/fpsr/fpiar,sp@- + fmovemx fp0-fp7,sp@- + .chip 68000 +SDL_MintAudio_Dma8_nofpu1: + + /* Callback */ + jsr _SDL_MintAudio_Callback + + /* Restore FPU if needed */ + tstw _SDL_MintAudio_hasfpu + beqs SDL_MintAudio_Dma8_nofpu2 + .chip 68060 + fmovemx sp@+,fp0-fp7 + fmoveml sp@+,fpcr/fpsr/fpiar + frestore sp@+ + .chip 68000 +SDL_MintAudio_Dma8_nofpu2: + + /* Set new buffer */ + + moveq #0,d0 + + movew _SDL_MintAudio_numbuf,d0 + lslw #2,d0 + lea _SDL_MintAudio_audiobuf,a0 + movel a0@(d0:w),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 +SDL_MintAudio_Dma8End: + rte + +/*--- STFA interrupt vector ---*/ + +STFA_SOUND_START = 6 +STFA_SOUND_END = STFA_SOUND_START+8 + +_SDL_MintAudio_StfaInterrupt: + + /* Reenable interrupts, so other interrupts can work */ + movew #0x2300,sr + + /* Check if we are not already running */ + tstw _SDL_MintAudio_mutex + bnes SDL_MintAudio_StfaEnd + notw _SDL_MintAudio_mutex + + /* Swap buffers */ + eorw #1,_SDL_MintAudio_numbuf + + moveml d0-d7/a0-a6,sp@- + + /* Save FPU if needed */ + tstw _SDL_MintAudio_hasfpu + beqs SDL_MintAudio_Stfa_nofpu1 + .chip 68060 + fsave sp@- + fmoveml fpcr/fpsr/fpiar,sp@- + fmovemx fp0-fp7,sp@- + .chip 68000 +SDL_MintAudio_Stfa_nofpu1: + + /* Callback */ + jsr _SDL_MintAudio_Callback + + /* Restore FPU if needed */ + tstw _SDL_MintAudio_hasfpu + beqs SDL_MintAudio_Stfa_nofpu2 + .chip 68060 + fmovemx sp@+,fp0-fp7 + fmoveml sp@+,fpcr/fpsr/fpiar + frestore sp@+ + .chip 68000 +SDL_MintAudio_Stfa_nofpu2: + + /* Set new buffer */ + + moveq #0,d0 + movel _SDL_MintAudio_stfa,a1 + + movew _SDL_MintAudio_numbuf,d0 + lslw #2,d0 + lea _SDL_MintAudio_audiobuf,a0 + movel a0@(d0:w),d1 + + /* Modify STFA replay buffers */ + movel d1,a1@(STFA_SOUND_START) + addl _SDL_MintAudio_audiosize,d1 + movel d1,a1@(STFA_SOUND_END) + + moveml sp@+,d0-d7/a0-a6 + + clrw _SDL_MintAudio_mutex +SDL_MintAudio_StfaEnd: + rte |