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Introduce USD_{SET,GET}{BASE,LIMIT}. These help setting up the user

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segment descriptor hi and lo values. Idea from Solaris.

Reviewed by:	kib
This commit is contained in:
Rui Paulo 2010-07-06 16:56:27 +00:00
parent 67d187beb1
commit 8923c96ee1
1 changed files with 7 additions and 0 deletions
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7
sys/amd64/include/segments.h
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@ -74,6 +74,13 @@ struct user_segment_descriptor {
u_int64_t sd_hibase:8; /* segment base address (msb) */
} __packed;
#define USD_GETBASE(_sd) (((_sd)->sd_lobase) | (_sd)->sd_hibase << 24)
#define USD_SETBASE(_sd, _b) (_sd)->sd_lobase = (_b); \
(_sd)->sd_hibase = ((_b) >> 24);
#define USD_GETLIMIT(_sd) (((_sd)->sd_lolimit) | (_sd)->sd_hilimit << 16)
#define USD_SETLIMIT(_sd, _l) (_sd)->sd_lolimit = (_l); \
(_sd)->sd_hilimit = ((_l) >> 16);
/*
* System segment descriptors (128 bit wide)
*/