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memory: add MemoryRegionOps::valid.accepts

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MemoryRegionOps::valid tries to declaratively specify which transactions
are accepted by the device/bus, however it is not completely generic.  Add
a callback for special cases.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2011-11-13 13:05:27 +02:00
parent 5a31cd68ba
commit 897fa7cff2
2 changed files with 16 additions and 3 deletions
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12
memory.c
View file

@ -831,8 +831,14 @@ void memory_region_init(MemoryRegion *mr,
static bool memory_region_access_valid(MemoryRegion *mr,
target_phys_addr_t addr,
unsigned size)
unsigned size,
bool is_write)
{
if (mr->ops->valid.accepts
&& !mr->ops->valid.accepts(mr->opaque, addr, size, is_write)) {
return false;
}
if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
return false;
}
@ -856,7 +862,7 @@ static uint32_t memory_region_read_thunk_n(void *_mr,
MemoryRegion *mr = _mr;
uint64_t data = 0;
if (!memory_region_access_valid(mr, addr, size)) {
if (!memory_region_access_valid(mr, addr, size, false)) {
return -1U; /* FIXME: better signalling */
}
@ -880,7 +886,7 @@ static void memory_region_write_thunk_n(void *_mr,
{
MemoryRegion *mr = _mr;
if (!memory_region_access_valid(mr, addr, size)) {
if (!memory_region_access_valid(mr, addr, size, true)) {
return; /* FIXME: better signalling */
}

7
memory.h
View file

@ -71,6 +71,13 @@ struct MemoryRegionOps {
* accesses throw machine checks.
*/
bool unaligned;
/*
* If present, and returns #false, the transaction is not accepted
* by the device (and results in machine dependent behaviour such
* as a machine check exception).
*/
bool (*accepts)(void *opaque, target_phys_addr_t addr,
unsigned size, bool is_write);
} valid;
/* Internal implementation constraints: */
struct {