In-Reply-To: <20060718091950.075712000 at sous-sol.org> On Tue, 18 Jul 2006 00:00:06 -0700, Chris Wright wrote: > > Add Xen interface header files. > --- /dev/null Thu Jan 01 00:00:00 1970 +0000 > +++ b/include/xen/interface/arch-x86_32.h Thu Jun 08 19:24:13 2006 -0400 > +#define FIRST_RESERVED_GDT_PAGE 14 > +#define FIRST_RESERVED_GDT_BYTE (FIRST_RESERVED_GDT_PAGE * 4096) > +#define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8) == 7168 > + > +/* > + * These flat segments are in the Xen-private section of every GDT. Since these > + * are also present in the initial GDT, many OSes will be able to avoid > + * installing their own GDT. > + */ > +#define FLAT_RING1_CS 0xe019 /* GDT index 259 */ > +#define FLAT_RING1_DS 0xe021 /* GDT index 260 */ > +#define FLAT_RING1_SS 0xe021 /* GDT index 260 */ > +#define FLAT_RING3_CS 0xe02b /* GDT index 261 */ > +#define FLAT_RING3_DS 0xe033 /* GDT index 262 */ > +#define FLAT_RING3_SS 0xe033 /* GDT index 262 */ Umm, these definitions are magic hardcoded constants that really refer to indexes 7171 through 7174. How about this instead? +#define FLAT_RING1_CS (((FIRST_RESERVED_GDT_ENTRY + 3) << 3) | 1) +#define FLAT_RING1_DS (((FIRST_RESERVED_GDT_ENTRY + 4) << 3) | 1) +#define FLAT_RING1_SS FLAT_RING1_DS +#define FLAT_RING3_CS (((FIRST_RESERVED_GDT_ENTRY + 5) << 3) | 3) +#define FLAT_RING3_DS (((FIRST_RESERVED_GDT_ENTRY + 6) << 3) | 3) +#define FLAT_RING3_SS FLAT_RING3_DS -- Chuck And did we tell you the name of the game, boy, we call it Riding the Gravy Train.
