1 /* 2 * Copyright (C) 2004 Fujitsu Siemens Computers GmbH 3 * Licensed under the GPL 4 * 5 * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com> 6 */ 7 8 #ifndef __ASM_LDT_H 9 #define __ASM_LDT_H 10 11 #include <linux/mutex.h> 12 #include <asm/ldt.h> 13 14 #define LDT_PAGES_MAX \ 15 ((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE) 16 #define LDT_ENTRIES_PER_PAGE \ 17 (PAGE_SIZE/LDT_ENTRY_SIZE) 18 #define LDT_DIRECT_ENTRIES \ 19 ((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE) 20 21 struct ldt_entry { 22 __u32 a; 23 __u32 b; 24 }; 25 26 typedef struct uml_ldt { 27 int entry_count; 28 struct mutex lock; 29 union { 30 struct ldt_entry * pages[LDT_PAGES_MAX]; 31 struct ldt_entry entries[LDT_DIRECT_ENTRIES]; 32 } u; 33 } uml_ldt_t; 34 35 #define LDT_entry_a(info) \ 36 ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff)) 37 38 #define LDT_entry_b(info) \ 39 (((info)->base_addr & 0xff000000) | \ 40 (((info)->base_addr & 0x00ff0000) >> 16) | \ 41 ((info)->limit & 0xf0000) | \ 42 (((info)->read_exec_only ^ 1) << 9) | \ 43 ((info)->contents << 10) | \ 44 (((info)->seg_not_present ^ 1) << 15) | \ 45 ((info)->seg_32bit << 22) | \ 46 ((info)->limit_in_pages << 23) | \ 47 ((info)->useable << 20) | \ 48 0x7000) 49 50 #define _LDT_empty(info) (\ 51 (info)->base_addr == 0 && \ 52 (info)->limit == 0 && \ 53 (info)->contents == 0 && \ 54 (info)->read_exec_only == 1 && \ 55 (info)->seg_32bit == 0 && \ 56 (info)->limit_in_pages == 0 && \ 57 (info)->seg_not_present == 1 && \ 58 (info)->useable == 0 ) 59 60 #ifdef CONFIG_X86_64 61 #define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0)) 62 #else 63 #define LDT_empty(info) (_LDT_empty(info)) 64 #endif 65 66 struct uml_arch_mm_context { 67 uml_ldt_t ldt; 68 }; 69 70 #endif 71