diff options
Diffstat (limited to 'arch/sh/include/asm/segment.h')
-rw-r--r-- | arch/sh/include/asm/segment.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/sh/include/asm/segment.h b/arch/sh/include/asm/segment.h new file mode 100644 index 000000000..101c13c0c --- /dev/null +++ b/arch/sh/include/asm/segment.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_SH_SEGMENT_H +#define __ASM_SH_SEGMENT_H + +#ifndef __ASSEMBLY__ + +typedef struct { + unsigned long seg; +} mm_segment_t; + +#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) + +/* + * The fs value determines whether argument validity checking should be + * performed or not. If get_fs() == USER_DS, checking is performed, with + * get_fs() == KERNEL_DS, checking is bypassed. + * + * For historical reasons, these macros are grossly misnamed. + */ +#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL) +#ifdef CONFIG_MMU +#define USER_DS MAKE_MM_SEG(PAGE_OFFSET) +#else +#define USER_DS KERNEL_DS +#endif + +#define segment_eq(a, b) ((a).seg == (b).seg) + +#define get_ds() (KERNEL_DS) + +#define get_fs() (current_thread_info()->addr_limit) +#define set_fs(x) (current_thread_info()->addr_limit = (x)) + +#endif /* __ASSEMBLY__ */ +#endif /* __ASM_SH_SEGMENT_H */ |