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- /* thread_info.h: m68knommu low-level thread information
- * adapted from the i386 and PPC versions by Greg Ungerer (gerg@snapgear.com)
- *
- * Copyright (C) 2002 David Howells (dhowells@redhat.com)
- * - Incorporating suggestions made by Linus Torvalds and Dave Miller
- */
- #ifndef _ASM_THREAD_INFO_H
- #define _ASM_THREAD_INFO_H
- #include <asm/page.h>
- #ifdef __KERNEL__
- #ifndef __ASSEMBLY__
- /*
- * Size of kernel stack for each process. This must be a power of 2...
- */
- #ifdef CONFIG_4KSTACKS
- #define THREAD_SIZE_ORDER (0)
- #else
- #define THREAD_SIZE_ORDER (1)
- #endif
-
- /*
- * for asm files, THREAD_SIZE is now generated by asm-offsets.c
- */
- #define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER)
- /*
- * low level task data.
- */
- struct thread_info {
- struct task_struct *task; /* main task structure */
- struct exec_domain *exec_domain; /* execution domain */
- unsigned long flags; /* low level flags */
- int cpu; /* cpu we're on */
- int preempt_count; /* 0 => preemptable, <0 => BUG */
- struct restart_block restart_block;
- };
- /*
- * macros/functions for gaining access to the thread information structure
- */
- #define INIT_THREAD_INFO(tsk) \
- { \
- .task = &tsk, \
- .exec_domain = &default_exec_domain, \
- .flags = 0, \
- .cpu = 0, \
- .restart_block = { \
- .fn = do_no_restart_syscall, \
- }, \
- }
- #define init_thread_info (init_thread_union.thread_info)
- #define init_stack (init_thread_union.stack)
- /* how to get the thread information struct from C */
- static inline struct thread_info *current_thread_info(void)
- {
- struct thread_info *ti;
- __asm__(
- "move.l %%sp, %0 \n\t"
- "and.l %1, %0"
- : "=&d"(ti)
- : "di" (~(THREAD_SIZE-1))
- );
- return ti;
- }
- /* thread information allocation */
- #define alloc_thread_info(tsk) ((struct thread_info *) \
- __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
- #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_SIZE_ORDER)
- #endif /* __ASSEMBLY__ */
- #define PREEMPT_ACTIVE 0x4000000
- /*
- * thread information flag bit numbers
- */
- #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
- #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
- #define TIF_SIGPENDING 2 /* signal pending */
- #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
- #define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
- TIF_NEED_RESCHED */
- #define TIF_MEMDIE 5
- /* as above, but as bit values */
- #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
- #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
- #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
- #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
- #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
- #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
- #endif /* __KERNEL__ */
- #endif /* _ASM_THREAD_INFO_H */
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