#define dolog(...) fprintf (stderr, "dma: " __VA_ARGS__)
#ifdef DEBUG_DMA
-#define lwarn(...) fprintf (stderr, "dma: " __VA_ARGS__)
#define linfo(...) fprintf (stderr, "dma: " __VA_ARGS__)
#define ldebug(...) fprintf (stderr, "dma: " __VA_ARGS__)
#else
-#define lwarn(...)
#define linfo(...)
#define ldebug(...)
#endif
-#define LENOFA(a) ((int) (sizeof(a)/sizeof(a[0])))
-
struct dma_regs {
int now[2];
uint16_t base[2];
uint8_t flip_flop;
int dshift;
struct dma_regs regs[4];
+ qemu_irq *cpu_request_exit;
} dma_controllers[2];
enum {
};
+static void DMA_run (void);
+
static int channels[8] = {-1, 2, 3, 1, -1, -1, -1, 0};
static void write_page (void *opaque, uint32_t nport, uint32_t data)
d->status &= ~(1 << (ichan + 4));
}
d->status &= ~(1 << ichan);
+ DMA_run();
break;
case 0x0a: /* single mask */
d->mask |= 1 << (data & 3);
else
d->mask &= ~(1 << (data & 3));
+ DMA_run();
break;
case 0x0b: /* mode */
case 0x0e: /* clear mask for all channels */
d->mask = 0;
+ DMA_run();
break;
case 0x0f: /* write mask for all channels */
d->mask = data;
+ DMA_run();
break;
default:
ichan = nchan & 3;
linfo ("held cont=%d chan=%d\n", ncont, ichan);
dma_controllers[ncont].status |= 1 << (ichan + 4);
+ DMA_run();
}
void DMA_release_DREQ (int nchan)
ichan = nchan & 3;
linfo ("released cont=%d chan=%d\n", ncont, ichan);
dma_controllers[ncont].status &= ~(1 << (ichan + 4));
+ DMA_run();
}
static void channel_run (int ncont, int ichan)
}
#endif
- r = dma_controllers[ncont].regs + ichan;
n = r->transfer_handler (r->opaque, ichan + (ncont << 2),
r->now[COUNT], (r->base[COUNT] + 1) << ncont);
r->now[COUNT] = n;
ldebug ("dma_pos %d size %d\n", n, (r->base[COUNT] + 1) << ncont);
}
-void DMA_run (void)
+static QEMUBH *dma_bh;
+
+static void DMA_run (void)
{
struct dma_cont *d;
int icont, ichan;
+ int rearm = 0;
+ static int running = 0;
+
+ if (running) {
+ rearm = 1;
+ goto out;
+ } else {
+ running = 1;
+ }
d = dma_controllers;
mask = 1 << ichan;
- if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4))))
+ if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4)))) {
channel_run (icont, ichan);
+ rearm = 1;
+ }
}
}
+
+ running = 0;
+out:
+ if (rearm)
+ qemu_bh_schedule_idle(dma_bh);
+}
+
+static void DMA_run_bh(void *unused)
+{
+ DMA_run();
}
void DMA_register_channel (int nchan,
/* request the emulator to transfer a new DMA memory block ASAP */
void DMA_schedule(int nchan)
{
- CPUState *env = cpu_single_env;
- if (env)
- cpu_interrupt(env, CPU_INTERRUPT_EXIT);
+ struct dma_cont *d = &dma_controllers[nchan > 3];
+
+ qemu_irq_pulse(*d->cpu_request_exit);
}
static void dma_reset(void *opaque)
write_cont (d, (0x0d << d->dshift), 0);
}
+static int dma_phony_handler (void *opaque, int nchan, int dma_pos, int dma_len)
+{
+ dolog ("unregistered DMA channel used nchan=%d dma_pos=%d dma_len=%d\n",
+ nchan, dma_pos, dma_len);
+ return dma_pos;
+}
+
/* dshift = 0: 8 bit DMA, 1 = 16 bit DMA */
static void dma_init2(struct dma_cont *d, int base, int dshift,
- int page_base, int pageh_base)
+ int page_base, int pageh_base,
+ qemu_irq *cpu_request_exit)
{
- const static int page_port_list[] = { 0x1, 0x2, 0x3, 0x7 };
+ static const int page_port_list[] = { 0x1, 0x2, 0x3, 0x7 };
int i;
d->dshift = dshift;
+ d->cpu_request_exit = cpu_request_exit;
for (i = 0; i < 8; i++) {
register_ioport_write (base + (i << dshift), 1, 1, write_chan, d);
register_ioport_read (base + (i << dshift), 1, 1, read_chan, d);
}
- for (i = 0; i < LENOFA (page_port_list); i++) {
+ for (i = 0; i < ARRAY_SIZE (page_port_list); i++) {
register_ioport_write (page_base + page_port_list[i], 1, 1,
write_page, d);
register_ioport_read (page_base + page_port_list[i], 1, 1,
}
qemu_register_reset(dma_reset, d);
dma_reset(d);
+ for (i = 0; i < ARRAY_SIZE (d->regs); ++i) {
+ d->regs[i].transfer_handler = dma_phony_handler;
+ }
}
-static void dma_save (QEMUFile *f, void *opaque)
-{
- struct dma_cont *d = opaque;
- int i;
-
- /* qemu_put_8s (f, &d->status); */
- qemu_put_8s (f, &d->command);
- qemu_put_8s (f, &d->mask);
- qemu_put_8s (f, &d->flip_flop);
- qemu_put_be32s (f, &d->dshift);
-
- for (i = 0; i < 4; ++i) {
- struct dma_regs *r = &d->regs[i];
- qemu_put_be32s (f, &r->now[0]);
- qemu_put_be32s (f, &r->now[1]);
- qemu_put_be16s (f, &r->base[0]);
- qemu_put_be16s (f, &r->base[1]);
- qemu_put_8s (f, &r->mode);
- qemu_put_8s (f, &r->page);
- qemu_put_8s (f, &r->pageh);
- qemu_put_8s (f, &r->dack);
- qemu_put_8s (f, &r->eop);
+static const VMStateDescription vmstate_dma_regs = {
+ .name = "dma_regs",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField []) {
+ VMSTATE_INT32_ARRAY(now, struct dma_regs, 2),
+ VMSTATE_UINT16_ARRAY(base, struct dma_regs, 2),
+ VMSTATE_UINT8(mode, struct dma_regs),
+ VMSTATE_UINT8(page, struct dma_regs),
+ VMSTATE_UINT8(pageh, struct dma_regs),
+ VMSTATE_UINT8(dack, struct dma_regs),
+ VMSTATE_UINT8(eop, struct dma_regs),
+ VMSTATE_END_OF_LIST()
}
-}
+};
-static int dma_load (QEMUFile *f, void *opaque, int version_id)
+static int dma_post_load(void *opaque, int version_id)
{
- struct dma_cont *d = opaque;
- int i;
+ DMA_run();
- if (version_id != 1)
- return -EINVAL;
-
- /* qemu_get_8s (f, &d->status); */
- qemu_get_8s (f, &d->command);
- qemu_get_8s (f, &d->mask);
- qemu_get_8s (f, &d->flip_flop);
- qemu_get_be32s (f, &d->dshift);
-
- for (i = 0; i < 4; ++i) {
- struct dma_regs *r = &d->regs[i];
- qemu_get_be32s (f, &r->now[0]);
- qemu_get_be32s (f, &r->now[1]);
- qemu_get_be16s (f, &r->base[0]);
- qemu_get_be16s (f, &r->base[1]);
- qemu_get_8s (f, &r->mode);
- qemu_get_8s (f, &r->page);
- qemu_get_8s (f, &r->pageh);
- qemu_get_8s (f, &r->dack);
- qemu_get_8s (f, &r->eop);
- }
return 0;
}
-void DMA_init (int high_page_enable)
+static const VMStateDescription vmstate_dma = {
+ .name = "dma",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .post_load = dma_post_load,
+ .fields = (VMStateField []) {
+ VMSTATE_UINT8(command, struct dma_cont),
+ VMSTATE_UINT8(mask, struct dma_cont),
+ VMSTATE_UINT8(flip_flop, struct dma_cont),
+ VMSTATE_INT32(dshift, struct dma_cont),
+ VMSTATE_STRUCT_ARRAY(regs, struct dma_cont, 4, 1, vmstate_dma_regs, struct dma_regs),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+void DMA_init(int high_page_enable, qemu_irq *cpu_request_exit)
{
dma_init2(&dma_controllers[0], 0x00, 0, 0x80,
- high_page_enable ? 0x480 : -1);
+ high_page_enable ? 0x480 : -1, cpu_request_exit);
dma_init2(&dma_controllers[1], 0xc0, 1, 0x88,
- high_page_enable ? 0x488 : -1);
- register_savevm ("dma", 0, 1, dma_save, dma_load, &dma_controllers[0]);
- register_savevm ("dma", 1, 1, dma_save, dma_load, &dma_controllers[1]);
+ high_page_enable ? 0x488 : -1, cpu_request_exit);
+ vmstate_register (NULL, 0, &vmstate_dma, &dma_controllers[0]);
+ vmstate_register (NULL, 1, &vmstate_dma, &dma_controllers[1]);
+
+ dma_bh = qemu_bh_new(DMA_run_bh, NULL);
}
projects / qemu.git / blobdiff