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/*
* Copyright (C) 2004 Fujitsu Siemens Computers GmbH
* Licensed under the GPL
*
* Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
*/
#ifndef __ASM_LDT_H
#define __ASM_LDT_H
#include <linux/mutex.h>
#include <asm/ldt.h>
#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 mutex lock;
union {
struct ldt_entry * pages[LDT_PAGES_MAX];
struct ldt_entry entries[LDT_DIRECT_ENTRIES];
} u;
} uml_ldt_t;
#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 )
#ifdef CONFIG_X86_64
#define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0))
#else
#define LDT_empty(info) (_LDT_empty(info))
#endif
struct uml_arch_mm_context {
uml_ldt_t ldt;
};
#endif
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