mirror of https://gitee.com/openkylin/linux.git
35 lines
839 B
C
35 lines
839 B
C
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#ifndef __ASM_SH_SEGMENT_H
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#define __ASM_SH_SEGMENT_H
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#ifndef __ASSEMBLY__
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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/*
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* The fs value determines whether argument validity checking should be
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* performed or not. If get_fs() == USER_DS, checking is performed, with
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* get_fs() == KERNEL_DS, checking is bypassed.
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*
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* For historical reasons, these macros are grossly misnamed.
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*/
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#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL)
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#ifdef CONFIG_MMU
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#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
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#else
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#define USER_DS KERNEL_DS
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#endif
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#define segment_eq(a,b) ((a).seg == (b).seg)
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#define get_ds() (KERNEL_DS)
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#define get_fs() (current_thread_info()->addr_limit)
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#define set_fs(x) (current_thread_info()->addr_limit = (x))
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_SH_SEGMENT_H */
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