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author | Ingo Molnar <mingo@elte.hu> | 2009-03-05 14:47:28 +0300 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-03-05 14:47:28 +0300 |
commit | 7df4edb07cf54a4868b9a750424c0d2aa68f8d66 (patch) | |
tree | 0ad0ad3f3dcb6f9edf26dde42ba625053dddf54f /arch/m68k/include/asm/segment_mm.h | |
parent | 0d688da5505d77bcef2441e0a22d8cc26459702d (diff) | |
parent | 559595a985e106d2fa9f0c79b7f5805453fed593 (diff) | |
download | linux-7df4edb07cf54a4868b9a750424c0d2aa68f8d66.tar.xz |
Merge branch 'linus' into core/iommu
Diffstat (limited to 'arch/m68k/include/asm/segment_mm.h')
-rw-r--r-- | arch/m68k/include/asm/segment_mm.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/segment_mm.h b/arch/m68k/include/asm/segment_mm.h new file mode 100644 index 000000000000..7b0b2d3127f9 --- /dev/null +++ b/arch/m68k/include/asm/segment_mm.h @@ -0,0 +1,57 @@ +#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 */ |