qemu/rwhandler.h
Michael S. Tsirkin 049f7adbd5 rwhandler: simplified way to register for mem/io
Some users prefer a single callback with length passed as parameter to
using b/w/l callbacks. It would maybe be cleaner to just pass length to
existing callbacks but that's a lot of churn.  So for now add a wrapper.
For convenience use pcibus_t for address so a single callback can be
used for pci io and pci memory.

I did have to resort to preprocessor to reduce code duplication.  It is
however slightly more straightforward, and better contained than what we
had with pci_host_template.h. Again, it would go away if we just passed
len to existing callbacks.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-02-14 16:10:53 +02:00

28 lines
969 B
C

#ifndef READ_WRITE_HANDLER_H
#define READ_WRITE_HANDLER_H
#include "qemu-common.h"
#include "ioport.h"
typedef struct ReadWriteHandler ReadWriteHandler;
/* len is guaranteed to be one of 1, 2 or 4, addr is guaranteed to fit in an
* appropriate type (io/memory/etc). They do not need to be range checked. */
typedef void WriteHandlerFunc(ReadWriteHandler *, pcibus_t addr,
uint32_t value, int len);
typedef uint32_t ReadHandlerFunc(ReadWriteHandler *, pcibus_t addr, int len);
struct ReadWriteHandler {
WriteHandlerFunc *write;
ReadHandlerFunc *read;
};
/* Helpers for when we want to use a single routine with length. */
/* CPU memory handler: both read and write must be present. */
int cpu_register_io_memory_simple(ReadWriteHandler *);
/* io port handler: can supply only read or write handlers. */
int register_ioport_simple(ReadWriteHandler *,
pio_addr_t start, int length, int size);
#endif