Commit 620ac82e authored by Michael S. Tsirkin's avatar Michael S. Tsirkin
Browse files

range: add Range structure 



Sometimes we need to pass ranges around, add a
handy structure for this purpose.

Note: memory.c defines its own concept of AddrRange structure for
working with 128 addresses.  It's necessary there for doing range math.
This is not needed for most users: struct Range is
much simpler, and is only used for passing the range around.

Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent ab8bf290

include/qemu/range.h

+16 −0
Original line number Diff line number Diff line 
#ifndef QEMU_RANGE_H

#define QEMU_RANGE_H



#include <inttypes.h>



/*

 * Operations on 64 bit address ranges.

 * Notes:

 *   - ranges must not wrap around 0, but can include the last byte ~0x0LL.

 *   - this can not represent a full 0 to ~0x0LL range.

 */



/* A structure representing a range of addresses. */

struct Range {

    uint64_t begin; /* First byte of the range, or 0 if empty. */

    uint64_t end;   /* 1 + the last byte. 0 if range empty or ends at ~0x0LL. */

};

typedef struct Range Range;



/* Get last byte of a range from offset + length.

 * Undefined for ranges that wrap around 0. */

static inline uint64_t range_get_last(uint64_t offset, uint64_t len)