aboutsummaryrefslogtreecommitdiff
path: root/hw/dma
diff options
context:
space:
mode:
Diffstat (limited to 'hw/dma')
-rw-r--r--hw/dma/i82374.c5
-rw-r--r--hw/dma/i8257.c31
2 files changed, 17 insertions, 19 deletions
diff --git a/hw/dma/i82374.c b/hw/dma/i82374.c
index b8ad2e64ec..f63097154f 100644
--- a/hw/dma/i82374.c
+++ b/hw/dma/i82374.c
@@ -38,7 +38,6 @@ do { fprintf(stderr, "i82374 ERROR: " fmt , ## __VA_ARGS__); } while (0)
typedef struct I82374State {
uint8_t commands[8];
- qemu_irq out;
PortioList port_list;
} I82374State;
@@ -101,7 +100,7 @@ static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport)
static void i82374_realize(I82374State *s, Error **errp)
{
- DMA_init(1, &s->out);
+ DMA_init(1);
memset(s->commands, 0, sizeof(s->commands));
}
@@ -145,8 +144,6 @@ static void i82374_isa_realize(DeviceState *dev, Error **errp)
isa->iobase);
i82374_realize(s, errp);
-
- qdev_init_gpio_out(dev, &s->out, 1);
}
static Property i82374_properties[] = {
diff --git a/hw/dma/i8257.c b/hw/dma/i8257.c
index a414029bea..13984244a6 100644
--- a/hw/dma/i8257.c
+++ b/hw/dma/i8257.c
@@ -59,7 +59,6 @@ static struct dma_cont {
uint8_t flip_flop;
int dshift;
struct dma_regs regs[4];
- qemu_irq *cpu_request_exit;
MemoryRegion channel_io;
MemoryRegion cont_io;
} dma_controllers[2];
@@ -358,6 +357,7 @@ static void channel_run (int ncont, int ichan)
}
static QEMUBH *dma_bh;
+static bool dma_bh_scheduled;
static void DMA_run (void)
{
@@ -390,12 +390,15 @@ static void DMA_run (void)
running = 0;
out:
- if (rearm)
+ if (rearm) {
qemu_bh_schedule_idle(dma_bh);
+ dma_bh_scheduled = true;
+ }
}
static void DMA_run_bh(void *unused)
{
+ dma_bh_scheduled = false;
DMA_run();
}
@@ -458,12 +461,14 @@ int DMA_write_memory (int nchan, void *buf, int pos, int len)
return len;
}
-/* request the emulator to transfer a new DMA memory block ASAP */
-void DMA_schedule(int nchan)
+/* request the emulator to transfer a new DMA memory block ASAP (even
+ * if the idle bottom half would not have exited the iothread yet).
+ */
+void DMA_schedule(void)
{
- struct dma_cont *d = &dma_controllers[nchan > 3];
-
- qemu_irq_pulse(*d->cpu_request_exit);
+ if (dma_bh_scheduled) {
+ qemu_notify_event();
+ }
}
static void dma_reset(void *opaque)
@@ -515,13 +520,11 @@ static const MemoryRegionOps cont_io_ops = {
/* 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,
- qemu_irq *cpu_request_exit)
+ int page_base, int pageh_base)
{
int i;
d->dshift = dshift;
- d->cpu_request_exit = cpu_request_exit;
memory_region_init_io(&d->channel_io, NULL, &channel_io_ops, d,
"dma-chan", 8 << d->dshift);
@@ -585,12 +588,10 @@ static const VMStateDescription vmstate_dma = {
}
};
-void DMA_init(int high_page_enable, qemu_irq *cpu_request_exit)
+void DMA_init(int high_page_enable)
{
- dma_init2(&dma_controllers[0], 0x00, 0, 0x80,
- high_page_enable ? 0x480 : -1, cpu_request_exit);
- dma_init2(&dma_controllers[1], 0xc0, 1, 0x88,
- high_page_enable ? 0x488 : -1, cpu_request_exit);
+ dma_init2(&dma_controllers[0], 0x00, 0, 0x80, high_page_enable ? 0x480 : -1);
+ dma_init2(&dma_controllers[1], 0xc0, 1, 0x88, high_page_enable ? 0x488 : -1);
vmstate_register (NULL, 0, &vmstate_dma, &dma_controllers[0]);
vmstate_register (NULL, 1, &vmstate_dma, &dma_controllers[1]);