1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
160 lines
4.6 KiB
C
160 lines
4.6 KiB
C
/* thread_info.h: description
|
|
*
|
|
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
* Derived from include/asm-i386/thread_info.h
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _ASM_THREAD_INFO_H
|
|
#define _ASM_THREAD_INFO_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <asm/processor.h>
|
|
#endif
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
|
|
struct thread_info {
|
|
struct task_struct *task; /* main task structure */
|
|
struct exec_domain *exec_domain; /* execution domain */
|
|
unsigned long flags; /* low level flags */
|
|
unsigned long status; /* thread-synchronous flags */
|
|
__u32 cpu; /* current CPU */
|
|
__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
|
|
|
|
mm_segment_t addr_limit; /* thread address space:
|
|
0-0xBFFFFFFF for user-thead
|
|
0-0xFFFFFFFF for kernel-thread
|
|
*/
|
|
struct restart_block restart_block;
|
|
|
|
__u8 supervisor_stack[0];
|
|
};
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
/* offsets into the thread_info struct for assembly code access */
|
|
#define TI_TASK 0x00000000
|
|
#define TI_EXEC_DOMAIN 0x00000004
|
|
#define TI_FLAGS 0x00000008
|
|
#define TI_STATUS 0x0000000C
|
|
#define TI_CPU 0x00000010
|
|
#define TI_PRE_COUNT 0x00000014
|
|
#define TI_ADDR_LIMIT 0x00000018
|
|
#define TI_RESTART_BLOCK 0x0000001C
|
|
|
|
#endif
|
|
|
|
#define PREEMPT_ACTIVE 0x4000000
|
|
|
|
/*
|
|
* macros/functions for gaining access to the thread information structure
|
|
*
|
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#define INIT_THREAD_INFO(tsk) \
|
|
{ \
|
|
.task = &tsk, \
|
|
.exec_domain = &default_exec_domain, \
|
|
.flags = 0, \
|
|
.cpu = 0, \
|
|
.preempt_count = 1, \
|
|
.addr_limit = KERNEL_DS, \
|
|
.restart_block = { \
|
|
.fn = do_no_restart_syscall, \
|
|
}, \
|
|
}
|
|
|
|
#define init_thread_info (init_thread_union.thread_info)
|
|
#define init_stack (init_thread_union.stack)
|
|
|
|
#ifdef CONFIG_SMALL_TASKS
|
|
#define THREAD_SIZE 4096
|
|
#else
|
|
#define THREAD_SIZE 8192
|
|
#endif
|
|
|
|
/* how to get the thread information struct from C */
|
|
register struct thread_info *__current_thread_info asm("gr15");
|
|
|
|
#define current_thread_info() ({ __current_thread_info; })
|
|
|
|
/* thread information allocation */
|
|
#ifdef CONFIG_DEBUG_STACK_USAGE
|
|
#define alloc_thread_info(tsk) \
|
|
({ \
|
|
struct thread_info *ret; \
|
|
\
|
|
ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
|
|
if (ret) \
|
|
memset(ret, 0, THREAD_SIZE); \
|
|
ret; \
|
|
})
|
|
#else
|
|
#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
|
|
#endif
|
|
|
|
#define free_thread_info(info) kfree(info)
|
|
#define get_thread_info(ti) get_task_struct((ti)->task)
|
|
#define put_thread_info(ti) put_task_struct((ti)->task)
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
#define THREAD_SIZE 8192
|
|
|
|
#endif
|
|
|
|
/*
|
|
* 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_SINGLESTEP 4 /* restore singlestep on return to user mode */
|
|
#define TIF_IRET 5 /* return with iret */
|
|
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
|
|
#define TIF_MEMDIE 17 /* OOM killer killed process */
|
|
|
|
#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_SINGLESTEP (1 << TIF_SINGLESTEP)
|
|
#define _TIF_IRET (1 << TIF_IRET)
|
|
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
|
|
|
|
#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
|
|
#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
|
|
|
|
/*
|
|
* Thread-synchronous status.
|
|
*
|
|
* This is different from the flags in that nobody else
|
|
* ever touches our thread-synchronous status, so we don't
|
|
* have to worry about atomic accesses.
|
|
*/
|
|
#define TS_USEDFPM 0x0001 /* FPU/Media was used by this task this quantum (SMP) */
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_THREAD_INFO_H */
|