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memory: add backward compatibility for old portio registration 

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Avi Kivity 2011-07-26 14:26:09 +03:00 committed by Anthony Liguori
parent 658b222401
commit 627a0e90dc
2 changed files with 49 additions and 0 deletions
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32
memory.c
View File

@ -218,6 +218,21 @@ static AddressSpace address_space_memory = {
.ops = &address_space_ops_memory,
};
static const MemoryRegionPortio *find_portio(MemoryRegion *mr, uint64_t offset,
unsigned width, bool write)
{
const MemoryRegionPortio *mrp;
for (mrp = mr->ops->old_portio; mrp->size; ++mrp) {
if (offset >= mrp->offset && offset < mrp->offset + mrp->len
&& width == mrp->size
&& (write ? (bool)mrp->write : (bool)mrp->read)) {
return mrp;
}
}
return NULL;
}
static void memory_region_iorange_read(IORange *iorange,
uint64_t offset,
unsigned width,
@ -225,6 +240,15 @@ static void memory_region_iorange_read(IORange *iorange,
{
MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
if (mr->ops->old_portio) {
const MemoryRegionPortio *mrp = find_portio(mr, offset, width, false);
*data = ((uint64_t)1 << (width * 8)) - 1;
if (mrp) {
*data = mrp->read(mr->opaque, offset - mrp->offset);
}
return;
}
*data = mr->ops->read(mr->opaque, offset, width);
}
@ -235,6 +259,14 @@ static void memory_region_iorange_write(IORange *iorange,
{
MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
if (mr->ops->old_portio) {
const MemoryRegionPortio *mrp = find_portio(mr, offset, width, true);
if (mrp) {
mrp->write(mr->opaque, offset - mrp->offset, data);
}
return;
}
mr->ops->write(mr->opaque, offset, data, width);
}

17
memory.h
View File

@ -23,9 +23,11 @@
#include "targphys.h"
#include "qemu-queue.h"
#include "iorange.h"
#include "ioport.h"
typedef struct MemoryRegionOps MemoryRegionOps;
typedef struct MemoryRegion MemoryRegion;
typedef struct MemoryRegionPortio MemoryRegionPortio;
/* Must match *_DIRTY_FLAGS in cpu-all.h. To be replaced with dynamic
* registration.
@ -78,6 +80,11 @@ struct MemoryRegionOps {
*/
bool unaligned;
} impl;
/* If .read and .write are not present, old_portio may be used for
* backwards compatibility with old portio registration
*/
const MemoryRegionPortio *old_portio;
};
typedef struct CoalescedMemoryRange CoalescedMemoryRange;
@ -105,6 +112,16 @@ struct MemoryRegion {
uint8_t dirty_log_mask;
};
struct MemoryRegionPortio {
uint32_t offset;
uint32_t len;
unsigned size;
IOPortReadFunc *read;
IOPortWriteFunc *write;
};
#define PORTIO_END { }
/**
* memory_region_init: Initialize a memory region
*