forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
106 lines
3.3 KiB
106 lines
3.3 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
|
/* |
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
|
* |
|
* 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) |
|
#define THREAD_SHIFT (PAGE_SHIFT << 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 */ |
|
__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, \ |
|
.flags = 0, \ |
|
.cpu = 0, \ |
|
.preempt_count = INIT_PREEMPT_COUNT, \ |
|
.addr_limit = KERNEL_DS, \ |
|
} |
|
|
|
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_NOTIFY_SIGNAL 5 /* signal notifications exist */ |
|
#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_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) |
|
#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_NOTIFY_SIGNAL) |
|
|
|
/* |
|
* _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it. |
|
* SYSCALL_TRACE is anyway seperately/unconditionally tested right after a |
|
* syscall, so all that reamins to be tested is _TIF_WORK_MASK |
|
*/ |
|
|
|
#endif /* _ASM_THREAD_INFO_H */
|
|
|