From: Michael S. Tsirkin Date: Mon, 13 May 2013 14:13:15 +0000 (+0300) Subject: range: add Range structure X-Git-Tag: TizenStudio_2.0_p2.3.2~208^2~1610^2~22 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=620ac82eb0fc4218fb6a4937bcef3fdab3126703;p=sdk%2Femulator%2Fqemu.git 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 Signed-off-by: Michael S. Tsirkin --- diff --git a/include/qemu/range.h b/include/qemu/range.h index 3502372..b76cc0d 100644 --- a/include/qemu/range.h +++ b/include/qemu/range.h @@ -1,6 +1,22 @@ #ifndef QEMU_RANGE_H #define QEMU_RANGE_H +#include + +/* + * 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)