1965aae3c9
Change header guards named "ASM_X86__*" to "_ASM_X86_*" since: a. the double underscore is ugly and pointless. b. no leading underscore violates namespace constraints. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
40 lines
963 B
C
40 lines
963 B
C
/*
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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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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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