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safer sb16 code 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@728 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-04-16 22:09:02 +00:00
parent 3294b949eb
commit 202a456a2b
1 changed files with 22 additions and 12 deletions
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34
hw/sb16.c
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@ -26,7 +26,6 @@
#define MIN(a, b) ((a)>(b)?(b):(a))
#define LENOFA(a) ((int) (sizeof(a)/sizeof(a[0])))
#define DEREF(x) (void)x
#define log(...) fprintf (stderr, "sb16: " __VA_ARGS__)
/* #define DEBUG_SB16 */
@ -83,7 +82,7 @@ typedef struct SB16State {
/* mixer state */
int mixer_nreg;
uint8_t mixer_regs[0x83];
uint8_t mixer_regs[256];
} SB16State;
/* XXX: suppress that and use a context */
@ -192,6 +191,12 @@ static void dma_cmd (uint8_t cmd, uint8_t d0, int dma_len)
dsp.speaker = 1;
}
static inline void dsp_out_data(SB16State *dsp, int val)
{
if (dsp->out_data_len < sizeof(dsp->out_data))
dsp->out_data[dsp->out_data_len++] = val;
}
static void command (SB16State *dsp, uint8_t cmd)
{
linfo ("%#x\n", cmd);
@ -228,7 +233,7 @@ static void command (SB16State *dsp, uint8_t cmd)
break;
case 0x20:
dsp->out_data[dsp->out_data_len++] = 0xff;
dsp_out_data(dsp, 0xff);
break;
case 0x35:
@ -315,12 +320,12 @@ static void command (SB16State *dsp, uint8_t cmd)
break;
case 0xe1:
dsp->out_data[dsp->out_data_len++] = sb.ver_lo;
dsp->out_data[dsp->out_data_len++] = sb.ver_hi;
dsp_out_data(dsp, sb.ver_lo);
dsp_out_data(dsp, sb.ver_hi);
return;
case 0xf2:
dsp->out_data[dsp->out_data_len++] = 0xaa;
dsp_out_data(dsp, 0xaa);
dsp->mixer_regs[0x82] |= dsp->mixer_regs[0x80];
pic_set_irq (sb.irq, 1);
return;
@ -398,9 +403,9 @@ static void complete (SB16State *dsp)
break;
case 0xe0:
dsp->out_data_len = 1;
dsp->out_data_len = 0;
linfo ("data = %#x\n", dsp->in_data[0]);
dsp->out_data[0] = dsp->in_data[0] ^ 0xff;
dsp_out_data(dsp, dsp->in_data[0] ^ 0xff);
break;
default:
@ -426,7 +431,7 @@ static IO_WRITE_PROTO (dsp_write)
dsp->v2x6 = 0;
else if ((1 == val) && (0 == dsp->v2x6)) {
dsp->v2x6 = 1;
dsp->out_data[dsp->out_data_len++] = 0xaa;
dsp_out_data(dsp, 0xaa);
}
else
dsp->v2x6 = ~0;
@ -519,12 +524,15 @@ static IO_READ_PROTO (dsp_read)
static IO_WRITE_PROTO(mixer_write_indexb)
{
SB16State *dsp = opaque;
dsp->mixer_nreg = val & 0xff;
dsp->mixer_nreg = val;
}
static IO_WRITE_PROTO(mixer_write_datab)
{
SB16State *dsp = opaque;
if (dsp->mixer_nreg > 0x83)
return;
dsp->mixer_regs[dsp->mixer_nreg] = val;
}
@ -666,6 +674,7 @@ static int magic_of_irq (int irq)
}
}
#if 0
static int irq_of_magic (int magic)
{
switch (magic) {
@ -682,6 +691,7 @@ static int irq_of_magic (int magic)
return 2;
}
}
#endif
void SB16_init (void)
{
@ -690,12 +700,12 @@ void SB16_init (void)
static const uint8_t dsp_write_ports[] = {0x6, 0xc};
static const uint8_t dsp_read_ports[] = {0x6, 0xa, 0xc, 0xd, 0xe, 0xf};
memset(s->mixer_regs, 0xff, sizeof(s->mixer_regs));
s->mixer_regs[0x0e] = ~0;
s->mixer_regs[0x80] = magic_of_irq (sb.irq);
s->mixer_regs[0x81] = 0x20 | (sb.dma << 1);
DEREF (irq_of_magic);
for (i = 0x30; i < 0x48; i++) {
s->mixer_regs[i] = 0x20;
}