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hw/dma.c: Fix conversion of ioport_register* to MemoryRegion

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The commit 5822993368 introduced a 1-shift for
some offset in DMA emulation.

Before the previous commit, which converted ioport_register_* to
MemoryRegion, the DMA controller registered 8 ioports with the following
formula:
base + ((8 + i) << d->shift) where 0 <= i < 8
When an IO occured within a Memory Region, DMA callback receives an
offset relative to the start address. Here the start address is:
base + (8 << d->shift).
The offset should be: (i << d->shift). After the shift is reverted, the
offsets are 0..7 not 1..8.

Fixes LP#1089996.

Reported-by: Andreas Gustafsson <gson@gson.org>
Signed-off-by: Julien Grall <julien.grall@citrix.com>
Tested-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Julien Grall 2012-12-19 12:09:21 +00:00 committed by Andreas Färber
parent cf7c3f0cb5
commit ecd584b836
1 changed files with 11 additions and 11 deletions
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22
hw/dma.c
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@ -201,7 +201,7 @@ static void write_cont(void *opaque, hwaddr nport, uint64_t data,
iport = (nport >> d->dshift) & 0x0f;
switch (iport) {
case 0x01: /* command */
case 0x00: /* command */
if ((data != 0) && (data & CMD_NOT_SUPPORTED)) {
dolog("command %"PRIx64" not supported\n", data);
return;
@ -209,7 +209,7 @@ static void write_cont(void *opaque, hwaddr nport, uint64_t data,
d->command = data;
break;
case 0x02:
case 0x01:
ichan = data & 3;
if (data & 4) {
d->status |= 1 << (ichan + 4);
@ -221,7 +221,7 @@ static void write_cont(void *opaque, hwaddr nport, uint64_t data,
DMA_run();
break;
case 0x03: /* single mask */
case 0x02: /* single mask */
if (data & 4)
d->mask |= 1 << (data & 3);
else
@ -229,7 +229,7 @@ static void write_cont(void *opaque, hwaddr nport, uint64_t data,
DMA_run();
break;
case 0x04: /* mode */
case 0x03: /* mode */
{
ichan = data & 3;
#ifdef DEBUG_DMA
@ -248,23 +248,23 @@ static void write_cont(void *opaque, hwaddr nport, uint64_t data,
break;
}
case 0x05: /* clear flip flop */
case 0x04: /* clear flip flop */
d->flip_flop = 0;
break;
case 0x06: /* reset */
case 0x05: /* reset */
d->flip_flop = 0;
d->mask = ~0;
d->status = 0;
d->command = 0;
break;
case 0x07: /* clear mask for all channels */
case 0x06: /* clear mask for all channels */
d->mask = 0;
DMA_run();
break;
case 0x08: /* write mask for all channels */
case 0x07: /* write mask for all channels */
d->mask = data;
DMA_run();
break;
@ -289,11 +289,11 @@ static uint64_t read_cont(void *opaque, hwaddr nport, unsigned size)
iport = (nport >> d->dshift) & 0x0f;
switch (iport) {
case 0x08: /* status */
case 0x00: /* status */
val = d->status;
d->status &= 0xf0;
break;
case 0x0f: /* mask */
case 0x01: /* mask */
val = d->mask;
break;
default:
@ -468,7 +468,7 @@ void DMA_schedule(int nchan)
static void dma_reset(void *opaque)
{
struct dma_cont *d = opaque;
write_cont(d, (0x06 << d->dshift), 0, 1);
write_cont(d, (0x05 << d->dshift), 0, 1);
}
static int dma_phony_handler (void *opaque, int nchan, int dma_pos, int dma_len)