+++ /dev/null
-/* 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 */
-#ifdef CONFIG_DEBUG_STACK_USAGE
-#define alloc_thread_info(tsk) \
- ({ \
- struct thread_info *ret; \
- \
- ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)); \
- if (ret) \
- memset(ret, 0, THREAD_SIZE); \
- ret; \
- })
-#else
-#define alloc_thread_info(tsk) \
- ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER))
-#endif
-
-#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_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_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
-#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
-/* 16 free */
-#define TIF_IA32 17 /* 32bit process */
-#define TIF_FORK 18 /* ret_from_fork */
-#define TIF_ABI_PENDING 19
-#define TIF_MEMDIE 20
-#define TIF_DEBUG 21 /* uses debug registers */
-#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
-#define TIF_FREEZE 23 /* is freezing for suspend */
-
-#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
-#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_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
-#define _TIF_MCE_NOTIFY (1<<TIF_MCE_NOTIFY)
-#define _TIF_IA32 (1<<TIF_IA32)
-#define _TIF_FORK (1<<TIF_FORK)
-#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
-#define _TIF_DEBUG (1<<TIF_DEBUG)
-#define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP)
-#define _TIF_FREEZE (1<<TIF_FREEZE)
-
-/* 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)
-
-/* flags to check in __switch_to() */
-#define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP)
-
-#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 */
-#define TS_POLLING 0x0004 /* true if in idle loop and not sleeping */
-
-#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
-
-#endif /* __KERNEL__ */
-
-#endif /* _ASM_THREAD_INFO_H */
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