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37 lines
909 B
37 lines
909 B
20 years ago
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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 _LINUX_LDT_H
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#define _LINUX_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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/* Note on 64bit base and limit is ignored and you cannot set
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DS/ES/CS 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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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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unsigned int lm:1;
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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
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