1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __UM_SEGMENT_H 3 #define __UM_SEGMENT_H 4 5 extern int host_gdt_entry_tls_min; 6 7 #define GDT_ENTRY_TLS_ENTRIES 3 8 #define GDT_ENTRY_TLS_MIN host_gdt_entry_tls_min 9 #define GDT_ENTRY_TLS_MAX (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1) 10 11 typedef struct { 12 unsigned long seg; 13 } mm_segment_t; 14 15 #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) 16 #define KERNEL_DS MAKE_MM_SEG(~0UL) 17 #define USER_DS MAKE_MM_SEG(TASK_SIZE) 18 19 #endif 20