| /* |
| * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * Vineetg: Oct 2009 |
| * No need for ARC specific thread_info allocator (kmalloc/free). This is |
| * anyways one page allocation, thus slab alloc can be short-circuited and |
| * the generic version (get_free_page) would be loads better. |
| * |
| * Sameer Dhavale: Codito Technologies 2004 |
| */ |
| |
| #ifndef _ASM_THREAD_INFO_H |
| #define _ASM_THREAD_INFO_H |
| |
| #include <asm/page.h> |
| |
| #ifdef CONFIG_16KSTACKS |
| #define THREAD_SIZE_ORDER 1 |
| #else |
| #define THREAD_SIZE_ORDER 0 |
| #endif |
| |
| #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) |
| |
| #ifndef __ASSEMBLY__ |
| |
| #include <linux/thread_info.h> |
| #include <asm/segment.h> |
| |
| /* |
| * 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 { |
| unsigned long flags; /* low level flags */ |
| int preempt_count; /* 0 => preemptable, <0 => BUG */ |
| struct task_struct *task; /* main task structure */ |
| mm_segment_t addr_limit; /* thread address space */ |
| struct exec_domain *exec_domain;/* execution domain */ |
| __u32 cpu; /* current CPU */ |
| unsigned long thr_ptr; /* TLS ptr */ |
| }; |
| |
| /* |
| * 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, \ |
| .exec_domain = &default_exec_domain, \ |
| .flags = 0, \ |
| .cpu = 0, \ |
| .preempt_count = INIT_PREEMPT_COUNT, \ |
| .addr_limit = KERNEL_DS, \ |
| } |
| |
| #define init_thread_info (init_thread_union.thread_info) |
| #define init_stack (init_thread_union.stack) |
| |
| static inline __attribute_const__ 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_RESTORE_SIGMASK 0 /* restore sig mask in do_signal() */ |
| #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ |
| #define TIF_SIGPENDING 2 /* signal pending */ |
| #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ |
| #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ |
| #define TIF_SYSCALL_TRACE 15 /* syscall trace active */ |
| |
| /* true if poll_idle() is polling TIF_NEED_RESCHED */ |
| #define TIF_MEMDIE 16 |
| |
| #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_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
| #define _TIF_MEMDIE (1<<TIF_MEMDIE) |
| |
| /* work to do on interrupt/exception return */ |
| #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ |
| _TIF_NOTIFY_RESUME) |
| |
| /* |
| * _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it. |
| * SYSCALL_TRACE is anways seperately/unconditionally tested right after a |
| * syscall, so all that reamins to be tested is _TIF_WORK_MASK |
| */ |
| |
| #endif /* _ASM_THREAD_INFO_H */ |