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Diffstat (limited to 'include/asm-v850/thread_info.h')
| -rw-r--r-- | include/asm-v850/thread_info.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/include/asm-v850/thread_info.h b/include/asm-v850/thread_info.h new file mode 100644 index 00000000000..e2ef4459375 --- /dev/null +++ b/include/asm-v850/thread_info.h @@ -0,0 +1,132 @@ +/* + * include/asm-v850/thread_info.h -- v850 low-level thread information + * + * Copyright (C) 2002 NEC Corporation + * Copyright (C) 2002 Miles Bader <miles@gnu.org> + * Copyright (C) 2002 David Howells (dhowells@redhat.com) + * - Incorporating suggestions made by Linus Torvalds and Dave Miller + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * This file was derived from the PPC version, include/asm-ppc/thread_info.h + * which was adapted from the i386 version by Paul Mackerras + */ + +#ifndef __V850_THREAD_INFO_H__ +#define __V850_THREAD_INFO_H__ + +#ifdef __KERNEL__ + +#ifndef __ASSEMBLY__ + +/* + * low level task data. + * If you change this, change the TI_* offsets below to match. + */ +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; + struct restart_block restart_block; +}; + +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task = &tsk, \ + .exec_domain = &default_exec_domain, \ + .flags = 0, \ + .cpu = 0, \ + .preempt_count = 1, \ + .restart_block = { \ + .fn = do_no_restart_syscall, \ + }, \ +} + +#define init_thread_info (init_thread_union.thread_info) +#define init_stack (init_thread_union.stack) + +/* + * macros/functions for gaining access to the thread information structure + */ + +/* thread information allocation */ +#define alloc_thread_info(tsk) ((struct thread_info *) \ + __get_free_pages(GFP_KERNEL, 1)) +#define free_thread_info(ti) free_pages((unsigned long) (ti), 1) +#define get_thread_info(ti) get_task_struct((ti)->task) +#define put_thread_info(ti) put_task_struct((ti)->task) + +#endif /* __ASSEMBLY__ */ + + +/* + * Offsets in thread_info structure, used in assembly code + */ +#define TI_TASK 0 +#define TI_EXECDOMAIN 4 +#define TI_FLAGS 8 +#define TI_CPU 12 +#define TI_PREEMPT 16 + +#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) + + +/* Size of kernel stack for each process. */ +#define THREAD_SIZE 0x2000 + +/* The alignment of kernel threads, with thread_info structures at their + base. Thus, a pointer for a task's task structure can be derived from + its kernel stack pointer. */ +#define THREAD_ALIGNMENT THREAD_SIZE +#define THREAD_MASK (-THREAD_ALIGNMENT) + + +#ifdef __ASSEMBLY__ + +/* Put a pointer to the current thread_info structure into REG. Note that + this definition requires THREAD_MASK to be representable as a signed + 16-bit value. */ +#define GET_CURRENT_THREAD(reg) \ + /* Use `addi' and then `and' instead of just `andi', because \ + `addi' sign-extends the immediate value, whereas `andi' \ + zero-extends it. */ \ + addi THREAD_MASK, r0, reg; \ + and sp, reg + +#else + +/* Return a pointer to the current thread_info structure. */ +static inline struct thread_info *current_thread_info (void) +{ + register unsigned long sp __asm__ ("sp"); + return (struct thread_info *)(sp & THREAD_MASK); +} + +#endif /* __ASSEMBLY__ */ + + +#endif /* __KERNEL__ */ + +#endif /* __V850_THREAD_INFO_H__ */ |