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-rw-r--r--hw/gus.c300
1 files changed, 300 insertions, 0 deletions
diff --git a/hw/gus.c b/hw/gus.c
new file mode 100644
index 0000000000..57753a7f5c
--- /dev/null
+++ b/hw/gus.c
@@ -0,0 +1,300 @@
+/*
+ * QEMU Proxy for Gravis Ultrasound GF1 emulation by Tibor "TS" Schütz
+ *
+ * Copyright (c) 2002-2005 Vassili Karpov (malc)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "hw.h"
+#include "audiodev.h"
+#include "audio/audio.h"
+#include "isa.h"
+#include "gusemu.h"
+#include "gustate.h"
+
+#define dolog(...) AUD_log ("audio", __VA_ARGS__)
+#ifdef DEBUG
+#define ldebug(...) dolog (__VA_ARGS__)
+#else
+#define ldebug(...)
+#endif
+
+#ifdef WORDS_BIGENDIAN
+#define GUS_ENDIANNESS 1
+#else
+#define GUS_ENDIANNESS 0
+#endif
+
+#define IO_READ_PROTO(name) \
+ uint32_t name (void *opaque, uint32_t nport)
+#define IO_WRITE_PROTO(name) \
+ void name (void *opaque, uint32_t nport, uint32_t val)
+
+static struct {
+ int port;
+ int irq;
+ int dma;
+ int freq;
+} conf = {0x240, 7, 3, 44100};
+
+typedef struct GUSState {
+ GUSEmuState emu;
+ QEMUSoundCard card;
+ int freq;
+ int pos, left, shift, irqs;
+ uint16_t *mixbuf;
+ uint8_t himem[1024 * 1024 + 32 + 4096];
+ int samples;
+ SWVoiceOut *voice;
+ int64_t last_ticks;
+ qemu_irq *pic;
+} GUSState;
+
+IO_READ_PROTO (gus_readb)
+{
+ GUSState *s = opaque;
+
+ return gus_read (&s->emu, nport, 1);
+}
+
+IO_READ_PROTO (gus_readw)
+{
+ GUSState *s = opaque;
+
+ return gus_read (&s->emu, nport, 2);
+}
+
+IO_WRITE_PROTO (gus_writeb)
+{
+ GUSState *s = opaque;
+
+ gus_write (&s->emu, nport, 1, val);
+}
+
+IO_WRITE_PROTO (gus_writew)
+{
+ GUSState *s = opaque;
+
+ gus_write (&s->emu, nport, 2, val);
+}
+
+static int write_audio (GUSState *s, int samples)
+{
+ int net = 0;
+ int pos = s->pos;
+
+ while (samples) {
+ int nbytes, wbytes, wsampl;
+
+ nbytes = samples << s->shift;
+ wbytes = AUD_write (
+ s->voice,
+ s->mixbuf + (pos << (s->shift - 1)),
+ nbytes
+ );
+
+ if (wbytes) {
+ wsampl = wbytes >> s->shift;
+
+ samples -= wsampl;
+ pos = (pos + wsampl) % s->samples;
+
+ net += wsampl;
+ }
+ else {
+ break;
+ }
+ }
+
+ return net;
+}
+
+static void GUS_callback (void *opaque, int free)
+{
+ int samples, to_play, net = 0;
+ GUSState *s = opaque;
+
+ samples = free >> s->shift;
+ to_play = audio_MIN (samples, s->left);
+
+ while (to_play) {
+ int written = write_audio (s, to_play);
+
+ if (!written) {
+ goto reset;
+ }
+
+ s->left -= written;
+ to_play -= written;
+ samples -= written;
+ net += written;
+ }
+
+ samples = audio_MIN (samples, s->samples);
+ if (samples) {
+ gus_mixvoices (&s->emu, s->freq, samples, s->mixbuf);
+
+ while (samples) {
+ int written = write_audio (s, samples);
+ if (!written) {
+ break;
+ }
+ samples -= written;
+ net += written;
+ }
+ }
+ s->left = samples;
+
+reset:
+ gus_irqgen (&s->emu, (double) (net * 1000000) / s->freq);
+}
+
+int GUS_irqrequest (GUSEmuState *emu, int hwirq, int n)
+{
+ GUSState *s = emu->opaque;
+ /* qemu_irq_lower (s->pic[hwirq]); */
+ qemu_irq_raise (s->pic[hwirq]);
+ s->irqs += n;
+ ldebug ("irqrequest %d %d %d\n", hwirq, n, s->irqs);
+ return n;
+}
+
+void GUS_irqclear (GUSEmuState *emu, int hwirq)
+{
+ GUSState *s = emu->opaque;
+ ldebug ("irqclear %d %d\n", hwirq, s->irqs);
+ qemu_irq_lower (s->pic[hwirq]);
+ s->irqs -= 1;
+#ifdef IRQ_STORM
+ if (s->irqs > 0) {
+ qemu_irq_raise (s->pic[hwirq]);
+ }
+#endif
+}
+
+void GUS_dmarequest (GUSEmuState *der)
+{
+ /* GUSState *s = (GUSState *) der; */
+ ldebug ("dma request %d\n", der->gusdma);
+ DMA_hold_DREQ (der->gusdma);
+}
+
+int GUS_read_DMA (void *opaque, int nchan, int dma_pos, int dma_len)
+{
+ GUSState *s = opaque;
+ int8_t tmpbuf[4096];
+ int pos = dma_pos, mode, left = dma_len - dma_pos;
+
+ ldebug ("read DMA %#x %d\n", dma_pos, dma_len);
+ mode = DMA_get_channel_mode (s->emu.gusdma);
+ while (left) {
+ int to_copy = audio_MIN ((size_t) left, sizeof (tmpbuf));
+ int copied;
+
+ ldebug ("left=%d to_copy=%d pos=%d\n", left, to_copy, pos);
+ copied = DMA_read_memory (nchan, tmpbuf, pos, to_copy);
+ gus_dma_transferdata (&s->emu, tmpbuf, copied, left == copied);
+ left -= copied;
+ pos += copied;
+ }
+
+ if (0 == ((mode >> 4) & 1)) {
+ DMA_release_DREQ (s->emu.gusdma);
+ }
+ return dma_len;
+}
+
+int GUS_init (AudioState *audio, qemu_irq *pic)
+{
+ GUSState *s;
+ audsettings_t as;
+
+ if (!audio) {
+ dolog ("No audio state\n");
+ return -1;
+ }
+
+ s = qemu_mallocz (sizeof (*s));
+ if (!s) {
+ dolog ("Could not allocate memory for GUS (%zu bytes)\n",
+ sizeof (*s));
+ return -1;
+ }
+
+ AUD_register_card (audio, "gus", &s->card);
+
+ as.freq = conf.freq;
+ as.nchannels = 2;
+ as.fmt = AUD_FMT_S16;
+ as.endianness = GUS_ENDIANNESS;
+
+ s->voice = AUD_open_out (
+ &s->card,
+ NULL,
+ "gus",
+ s,
+ GUS_callback,
+ &as
+ );
+
+ if (!s->voice) {
+ AUD_remove_card (&s->card);
+ qemu_free (s);
+ return -1;
+ }
+
+ s->shift = 2;
+ s->samples = AUD_get_buffer_size_out (s->voice) >> s->shift;
+ s->mixbuf = qemu_mallocz (s->samples << s->shift);
+ if (!s->mixbuf) {
+ AUD_close_out (&s->card, s->voice);
+ AUD_remove_card (&s->card);
+ qemu_free (s);
+ return -1;
+ }
+
+ register_ioport_write (conf.port, 1, 1, gus_writeb, s);
+ register_ioport_write (conf.port, 1, 2, gus_writew, s);
+
+ register_ioport_read ((conf.port + 0x100) & 0xf00, 1, 1, gus_readb, s);
+ register_ioport_read ((conf.port + 0x100) & 0xf00, 1, 2, gus_readw, s);
+
+ register_ioport_write (conf.port + 6, 10, 1, gus_writeb, s);
+ register_ioport_write (conf.port + 6, 10, 2, gus_writew, s);
+ register_ioport_read (conf.port + 6, 10, 1, gus_readb, s);
+ register_ioport_read (conf.port + 6, 10, 2, gus_readw, s);
+
+
+ register_ioport_write (conf.port + 0x100, 8, 1, gus_writeb, s);
+ register_ioport_write (conf.port + 0x100, 8, 2, gus_writew, s);
+ register_ioport_read (conf.port + 0x100, 8, 1, gus_readb, s);
+ register_ioport_read (conf.port + 0x100, 8, 2, gus_readw, s);
+
+ DMA_register_channel (conf.dma, GUS_read_DMA, s);
+ s->emu.gusirq = conf.irq;
+ s->emu.gusdma = conf.dma;
+ s->emu.himemaddr = s->himem;
+ s->emu.gusdatapos = s->emu.himemaddr + 1024 * 1024 + 32;
+ s->emu.opaque = s;
+ s->freq = conf.freq;
+ s->pic = pic;
+
+ AUD_set_active_out (s->voice, 1);
+ return 0;
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-02 08:46:28 +0000