/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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/*

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* ldt.h

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*

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* Definitions of structures used with the modify_ldt system call.

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*/

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#ifndef _ASM_X86_LDT_H

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#define _ASM_X86_LDT_H

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/* Maximum number of LDT entries supported. */

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#define LDT_ENTRIES 8192

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/* The size of each LDT entry. */

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#define LDT_ENTRY_SIZE 8

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#ifndef __ASSEMBLY__

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/*

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* Note on 64bit base and limit is ignored and you cannot set DS/ES/CS

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* not to the default values if you still want to do syscalls. This

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* call is more for 32bit mode therefore.

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*/

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struct user_desc {

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unsigned int entry_number;

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unsigned int base_addr;

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unsigned int limit;

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unsigned int seg_32bit:1;

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unsigned int contents:2;

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unsigned int read_exec_only:1;

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unsigned int limit_in_pages:1;

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unsigned int seg_not_present:1;

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unsigned int useable:1;

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#ifdef __x86_64__

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/*

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* Because this bit is not present in 32-bit user code, user

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* programs can pass uninitialized values here. Therefore, in

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* any context in which a user_desc comes from a 32-bit program,

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* the kernel must act as though lm == 0, regardless of the

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* actual value.

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*/

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unsigned int lm:1;

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#endif

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};

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#define MODIFY_LDT_CONTENTS_DATA 0

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#define MODIFY_LDT_CONTENTS_STACK 1

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#define MODIFY_LDT_CONTENTS_CODE 2

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#endif /* !__ASSEMBLY__ */

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#endif /* _ASM_X86_LDT_H */

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