f5a61d0c13
{get,put}_thread_info() were introduced in 2.5.4 and never
had been called by anything in the tree.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
/* thread_info.h: x86_64 low-level thread information
|
|
*
|
|
* Copyright (C) 2002 David Howells (dhowells@redhat.com)
|
|
* - Incorporating suggestions made by Linus Torvalds and Dave Miller
|
|
*/
|
|
|
|
#ifndef _ASM_THREAD_INFO_H
|
|
#define _ASM_THREAD_INFO_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/types.h>
|
|
#include <asm/pda.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
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
struct task_struct;
|
|
struct exec_domain;
|
|
#include <asm/mmsegment.h>
|
|
|
|
struct thread_info {
|
|
struct task_struct *task; /* main task structure */
|
|
struct exec_domain *exec_domain; /* execution domain */
|
|
__u32 flags; /* low level flags */
|
|
__u32 status; /* thread synchronous flags */
|
|
__u32 cpu; /* current CPU */
|
|
int preempt_count; /* 0 => preemptable, <0 => BUG */
|
|
|
|
mm_segment_t addr_limit;
|
|
struct restart_block restart_block;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* 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)
|
|
|
|
static inline struct thread_info *current_thread_info(void)
|
|
{
|
|
struct thread_info *ti;
|
|
ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
|
|
return ti;
|
|
}
|
|
|
|
/* do not use in interrupt context */
|
|
static inline struct thread_info *stack_thread_info(void)
|
|
{
|
|
struct thread_info *ti;
|
|
__asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1)));
|
|
return ti;
|
|
}
|
|
|
|
/* thread information allocation */
|
|
#define alloc_thread_info(tsk) \
|
|
((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER))
|
|
#define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
|
|
|
|
#else /* !__ASSEMBLY__ */
|
|
|
|
/* how to get the thread information struct from ASM */
|
|
#define GET_THREAD_INFO(reg) \
|
|
movq %gs:pda_kernelstack,reg ; \
|
|
subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
|
|
|
|
#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
|
|
* Warning: layout of LSW is hardcoded in entry.S
|
|
*/
|
|
#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 /* reenable singlestep on user return*/
|
|
#define TIF_IRET 5 /* force IRET */
|
|
#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
|
|
#define TIF_SECCOMP 8 /* secure computing */
|
|
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
|
|
#define TIF_IA32 17 /* 32bit process */
|
|
#define TIF_FORK 18 /* ret_from_fork */
|
|
#define TIF_ABI_PENDING 19
|
|
#define TIF_MEMDIE 20
|
|
|
|
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
|
|
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
|
|
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
|
|
#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
|
|
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
|
|
#define _TIF_IRET (1<<TIF_IRET)
|
|
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
|
|
#define _TIF_SECCOMP (1<<TIF_SECCOMP)
|
|
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
|
|
#define _TIF_IA32 (1<<TIF_IA32)
|
|
#define _TIF_FORK (1<<TIF_FORK)
|
|
#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
|
|
|
|
/* work to do on interrupt/exception return */
|
|
#define _TIF_WORK_MASK \
|
|
(0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP))
|
|
/* work to do on any return to user space */
|
|
#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
|
|
|
|
#define PREEMPT_ACTIVE 0x10000000
|
|
|
|
/*
|
|
* 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_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
|
|
#define TS_COMPAT 0x0002 /* 32bit syscall active */
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_THREAD_INFO_H */
|