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 extern void ldt_host_info(void); 15 16 #define LDT_PAGES_MAX \ 17 ((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE) 18 #define LDT_ENTRIES_PER_PAGE \ 19 (PAGE_SIZE/LDT_ENTRY_SIZE) 20 #define LDT_DIRECT_ENTRIES \ 21 ((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE) 22 23 struct ldt_entry { 24 __u32 a; 25 __u32 b; 26 }; 27 28 typedef struct uml_ldt { 29 int entry_count; 30 struct mutex lock; 31 union { 32 struct ldt_entry * pages[LDT_PAGES_MAX]; 33 struct ldt_entry entries[LDT_DIRECT_ENTRIES]; 34 } u; 35 } uml_ldt_t; 36 37 #define LDT_entry_a(info) \ 38 ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff)) 39 40 #define LDT_entry_b(info) \ 41 (((info)->base_addr & 0xff000000) | \ 42 (((info)->base_addr & 0x00ff0000) >> 16) | \ 43 ((info)->limit & 0xf0000) | \ 44 (((info)->read_exec_only ^ 1) << 9) | \ 45 ((info)->contents << 10) | \ 46 (((info)->seg_not_present ^ 1) << 15) | \ 47 ((info)->seg_32bit << 22) | \ 48 ((info)->limit_in_pages << 23) | \ 49 ((info)->useable << 20) | \ 50 0x7000) 51 52 #define _LDT_empty(info) (\ 53 (info)->base_addr == 0 && \ 54 (info)->limit == 0 && \ 55 (info)->contents == 0 && \ 56 (info)->read_exec_only == 1 && \ 57 (info)->seg_32bit == 0 && \ 58 (info)->limit_in_pages == 0 && \ 59 (info)->seg_not_present == 1 && \ 60 (info)->useable == 0 ) 61 62 #ifdef CONFIG_X86_64 63 #define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0)) 64 #else 65 #define LDT_empty(info) (_LDT_empty(info)) 66 #endif 67 68 struct uml_arch_mm_context { 69 uml_ldt_t ldt; 70 }; 71 72 #endif 73