Date: Wed, 21 Sep 2016 10:10:36 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r306088 - head/sys/amd64/include Message-ID: <201609211010.u8LAAahN090202@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: kib Date: Wed Sep 21 10:10:36 2016 New Revision: 306088 URL: https://svnweb.freebsd.org/changeset/base/306088 Log: Add amd64 functions to load/store GDT register, store IDT and TR registers. Note that lgdt() name is already used for function which, besides loading GDT, also reloads segment descriptors cache, thus new function is named bare_lgdt(). Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/sys/amd64/include/cpufunc.h Modified: head/sys/amd64/include/cpufunc.h ============================================================================== --- head/sys/amd64/include/cpufunc.h Wed Sep 21 10:05:51 2016 (r306087) +++ head/sys/amd64/include/cpufunc.h Wed Sep 21 10:10:36 2016 (r306088) @@ -645,12 +645,36 @@ load_gs(u_short sel) #endif static __inline void +bare_lgdt(struct region_descriptor *addr) +{ + __asm __volatile("lgdt (%0)" : : "r" (addr)); +} + +static __inline void +sgdt(struct region_descriptor *addr) +{ + char *loc; + + loc = (char *)addr; + __asm __volatile("sgdt %0" : "=m" (*loc) : : "memory"); +} + +static __inline void lidt(struct region_descriptor *addr) { __asm __volatile("lidt (%0)" : : "r" (addr)); } static __inline void +sidt(struct region_descriptor *addr) +{ + char *loc; + + loc = (char *)addr; + __asm __volatile("sidt %0" : "=m" (*loc) : : "memory"); +} + +static __inline void lldt(u_short sel) { __asm __volatile("lldt %0" : : "r" (sel)); @@ -662,6 +686,15 @@ ltr(u_short sel) __asm __volatile("ltr %0" : : "r" (sel)); } +static __inline uint32_t +read_tr(void) +{ + u_short sel; + + __asm __volatile("str %0" : "=r" (sel)); + return (sel); +} + static __inline uint64_t rdr0(void) {
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201609211010.u8LAAahN090202>