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59 lines
1.3 KiB
59 lines
1.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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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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#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES |
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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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#define USER_DS MAKE_MM_SEG(__USER_DS) |
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#define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS) |
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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 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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#else |
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#define USER_DS MAKE_MM_SEG(TASK_SIZE) |
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#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) |
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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 |
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#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg) |
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#endif /* __ASSEMBLY__ */ |
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#endif /* _M68K_SEGMENT_H */
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