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58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
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#ifndef _M68K_SEGMENT_H
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#define _M68K_SEGMENT_H
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/* define constants */
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/* Address spaces (FC0-FC2) */
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#define USER_DATA (1)
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#ifndef __USER_DS
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#define __USER_DS (USER_DATA)
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#endif
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#define USER_PROGRAM (2)
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#define SUPER_DATA (5)
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#ifndef __KERNEL_DS
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#define __KERNEL_DS (SUPER_DATA)
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#endif
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#define SUPER_PROGRAM (6)
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#define CPU_SPACE (7)
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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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#define USER_DS MAKE_MM_SEG(__USER_DS)
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#define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS)
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/*
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* Get/set the SFC/DFC registers for MOVES instructions
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*/
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static inline mm_segment_t get_fs(void)
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{
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mm_segment_t _v;
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__asm__ ("movec %/dfc,%0":"=r" (_v.seg):);
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return _v;
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}
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static inline mm_segment_t get_ds(void)
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{
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/* return the supervisor data space code */
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return KERNEL_DS;
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}
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static inline void set_fs(mm_segment_t val)
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{
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__asm__ __volatile__ ("movec %0,%/sfc\n\t"
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"movec %0,%/dfc\n\t"
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: /* no outputs */ : "r" (val.seg) : "memory");
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}
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#define segment_eq(a,b) ((a).seg == (b).seg)
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#endif /* __ASSEMBLY__ */
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#endif /* _M68K_SEGMENT_H */
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