58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
#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 */
|