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Diffstat (limited to 'arch/nios2/include/asm/thread_info.h')
| -rw-r--r-- | arch/nios2/include/asm/thread_info.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/arch/nios2/include/asm/thread_info.h b/arch/nios2/include/asm/thread_info.h new file mode 100644 index 000000000..272d2c72a --- /dev/null +++ b/arch/nios2/include/asm/thread_info.h @@ -0,0 +1,113 @@ +/* + * NiosII low-level thread information + * + * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> + * Copyright (C) 2004 Microtronix Datacom Ltd. + * + * Based on asm/thread_info_no.h from m68k which is: + * + * Copyright (C) 2002 David Howells <dhowells@redhat.com> + * + * 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. + */ + +#ifndef _ASM_NIOS2_THREAD_INFO_H +#define _ASM_NIOS2_THREAD_INFO_H + +#ifdef __KERNEL__ + +/* + * Size of the kernel stack for each process. + */ +#define THREAD_SIZE_ORDER 1 +#define THREAD_SIZE 8192 /* 2 * PAGE_SIZE */ + +#ifndef __ASSEMBLY__ + +typedef struct { + unsigned long seg; +} mm_segment_t; + +/* + * low level task data that entry.S needs immediate access to + * - this struct should fit entirely inside of one cache line + * - this struct shares the supervisor stack pages + * - if the contents of this structure are changed, the assembly constants + * must also be changed + */ +struct thread_info { + struct task_struct *task; /* main task structure */ + unsigned long flags; /* low level flags */ + __u32 cpu; /* current CPU */ + int preempt_count; /* 0 => preemptable,<0 => BUG */ + mm_segment_t addr_limit; /* thread address space: + 0-0x7FFFFFFF for user-thead + 0-0xFFFFFFFF for kernel-thread + */ + struct pt_regs *regs; +}; + +/* + * macros/functions for gaining access to the thread information structure + * + * preempt_count needs to be 1 initially, until the scheduler is functional. + */ +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task = &tsk, \ + .flags = 0, \ + .cpu = 0, \ + .preempt_count = INIT_PREEMPT_COUNT, \ + .addr_limit = KERNEL_DS, \ +} + +/* how to get the thread information struct from C */ +static inline struct thread_info *current_thread_info(void) +{ + register unsigned long sp asm("sp"); + + return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); +} +#endif /* !__ASSEMBLY__ */ + +/* + * thread information flags + * - these are process state flags that various assembly files may need to + * access + * - pending work-to-be-done flags are in LSW + * - other flags in MSW + */ +#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_MEMDIE 4 /* is terminating due to OOM killer */ +#define TIF_SECCOMP 5 /* secure computing */ +#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */ +#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ +#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ + +#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling + TIF_NEED_RESCHED */ + +#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_SECCOMP (1 << TIF_SECCOMP) +#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) +#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) +#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) +#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) + +/* work to do on interrupt/exception return */ +#define _TIF_WORK_MASK 0x0000FFFE + +/* work to do on any return to u-space */ +# define _TIF_ALLWORK_MASK 0x0000FFFF + +#endif /* __KERNEL__ */ + +#endif /* _ASM_NIOS2_THREAD_INFO_H */ |