Viewing file:  segment.h (1.12 KB) -rw-r--r--
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#ifndef _M68K_SEGMENT_H
#define _M68K_SEGMENT_H
/* define constants */
/* Address spaces (FC0-FC2) */
#define USER_DATA (1)
#ifndef __USER_DS
#define __USER_DS (USER_DATA)
#endif
#define USER_PROGRAM (2)
#define SUPER_DATA (5)
#ifndef __KERNEL_DS
#define __KERNEL_DS (SUPER_DATA)
#endif
#define SUPER_PROGRAM (6)
#define CPU_SPACE (7)
#ifndef __ASSEMBLY__
typedef struct {
unsigned long seg;
} mm_segment_t;
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define USER_DS MAKE_MM_SEG(__USER_DS)
#define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS)
/*
* Get/set the SFC/DFC registers for MOVES instructions
*/
static inline mm_segment_t get_fs(void)
{
mm_segment_t _v;
__asm__ ("movec %/dfc,%0":"=r" (_v.seg):);
return _v;
}
static inline mm_segment_t get_ds(void)
{
/* return the supervisor data space code */
return KERNEL_DS;
}
static inline void set_fs(mm_segment_t val)
{
__asm__ __volatile__ ("movec %0,%/sfc\n\t"
"movec %0,%/dfc\n\t"
: /* no outputs */ : "r" (val.seg) : "memory");
}
#define segment_eq(a,b) ((a).seg == (b).seg)
#endif /* __ASSEMBLY__ */
#endif /* _M68K_SEGMENT_H */
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