cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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thread_info.h (3242B)

      1/*
      2 * NiosII low-level thread information
      3 *
      4 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
      5 * Copyright (C) 2004 Microtronix Datacom Ltd.
      6 *
      7 * Based on asm/thread_info_no.h from m68k which is:
      8 *
      9 * Copyright (C) 2002 David Howells <dhowells@redhat.com>
     10 *
     11 * This file is subject to the terms and conditions of the GNU General Public
     12 * License.  See the file "COPYING" in the main directory of this archive
     13 * for more details.
     14 */
     15
     16#ifndef _ASM_NIOS2_THREAD_INFO_H
     17#define _ASM_NIOS2_THREAD_INFO_H
     18
     19#ifdef __KERNEL__
     20
     21/*
     22 * Size of the kernel stack for each process.
     23 */
     24#define THREAD_SIZE_ORDER	1
     25#define THREAD_SIZE		8192 /* 2 * PAGE_SIZE */
     26
     27#ifndef __ASSEMBLY__
     28
     29/*
     30 * low level task data that entry.S needs immediate access to
     31 * - this struct should fit entirely inside of one cache line
     32 * - this struct shares the supervisor stack pages
     33 * - if the contents of this structure are changed, the assembly constants
     34 *   must also be changed
     35 */
     36struct thread_info {
     37	struct task_struct	*task;		/* main task structure */
     38	unsigned long		flags;		/* low level flags */
     39	__u32			cpu;		/* current CPU */
     40	int			preempt_count;	/* 0 => preemptable,<0 => BUG */
     41	struct pt_regs		*regs;
     42};
     43
     44/*
     45 * macros/functions for gaining access to the thread information structure
     46 *
     47 * preempt_count needs to be 1 initially, until the scheduler is functional.
     48 */
     49#define INIT_THREAD_INFO(tsk)			\
     50{						\
     51	.task		= &tsk,			\
     52	.flags		= 0,			\
     53	.cpu		= 0,			\
     54	.preempt_count	= INIT_PREEMPT_COUNT,	\
     55}
     56
     57/* how to get the thread information struct from C */
     58static inline struct thread_info *current_thread_info(void)
     59{
     60	register unsigned long sp asm("sp");
     61
     62	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
     63}
     64#endif /* !__ASSEMBLY__ */
     65
     66/*
     67 * thread information flags
     68 * - these are process state flags that various assembly files may need to
     69 *   access
     70 * - pending work-to-be-done flags are in LSW
     71 * - other flags in MSW
     72 */
     73#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
     74#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
     75#define TIF_SIGPENDING		2	/* signal pending */
     76#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
     77#define TIF_MEMDIE		4	/* is terminating due to OOM killer */
     78#define TIF_SECCOMP		5	/* secure computing */
     79#define TIF_SYSCALL_AUDIT	6	/* syscall auditing active */
     80#define TIF_NOTIFY_SIGNAL	7	/* signal notifications exist */
     81#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
     82
     83#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling
     84					   TIF_NEED_RESCHED */
     85
     86#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
     87#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
     88#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
     89#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
     90#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
     91#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
     92#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
     93#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
     94#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
     95
     96/* work to do on interrupt/exception return */
     97#define _TIF_WORK_MASK		0x0000FFFE
     98
     99/* work to do on any return to u-space */
    100# define _TIF_ALLWORK_MASK	0x0000FFFF
    101
    102#endif /* __KERNEL__ */
    103
    104#endif /* _ASM_NIOS2_THREAD_INFO_H */