/* * Copyright (C) 2004 Fujitsu Siemens Computers GmbH * Licensed under the GPL * * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com> */ #ifndef __ASM_LDT_I386_H #define __ASM_LDT_I386_H #include "asm/semaphore.h" #include "asm/arch/ldt.h" struct mmu_context_skas; extern void ldt_host_info(void); extern long init_new_ldt(struct mmu_context_skas * to_mm, struct mmu_context_skas * from_mm); extern void free_ldt(struct mmu_context_skas * mm); #define LDT_PAGES_MAX \ ((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE) #define LDT_ENTRIES_PER_PAGE \ (PAGE_SIZE/LDT_ENTRY_SIZE) #define LDT_DIRECT_ENTRIES \ ((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE) struct ldt_entry { __u32 a; __u32 b; }; typedef struct uml_ldt { int entry_count; struct semaphore semaphore; union { struct ldt_entry * pages[LDT_PAGES_MAX]; struct ldt_entry entries[LDT_DIRECT_ENTRIES]; }; } uml_ldt_t; /* * macros stolen from include/asm-i386/desc.h */ #define LDT_entry_a(info) \ ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff)) #define LDT_entry_b(info) \ (((info)->base_addr & 0xff000000) | \ (((info)->base_addr & 0x00ff0000) >> 16) | \ ((info)->limit & 0xf0000) | \ (((info)->read_exec_only ^ 1) << 9) | \ ((info)->contents << 10) | \ (((info)->seg_not_present ^ 1) << 15) | \ ((info)->seg_32bit << 22) | \ ((info)->limit_in_pages << 23) | \ ((info)->useable << 20) | \ 0x7000) #define LDT_empty(info) (\ (info)->base_addr == 0 && \ (info)->limit == 0 && \ (info)->contents == 0 && \ (info)->read_exec_only == 1 && \ (info)->seg_32bit == 0 && \ (info)->limit_in_pages == 0 && \ (info)->seg_not_present == 1 && \ (info)->useable == 0 ) #endif