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 (3572B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * OpenRISC Linux
      4 *
      5 * Linux architectural port borrowing liberally from similar works of
      6 * others.  All original copyrights apply as per the original source
      7 * declaration.
      8 *
      9 * OpenRISC implementation:
     10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
     11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
     12 * et al.
     13 */
     14
     15#ifndef _ASM_THREAD_INFO_H
     16#define _ASM_THREAD_INFO_H
     17
     18#ifdef __KERNEL__
     19
     20#ifndef __ASSEMBLY__
     21#include <asm/types.h>
     22#include <asm/processor.h>
     23#endif
     24
     25
     26/* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
     27 * normally, the stack is found by doing something like p + THREAD_SIZE
     28 * in or1k, a page is 8192 bytes, which seems like a sane size
     29 */
     30
     31#define THREAD_SIZE_ORDER 0
     32#define THREAD_SIZE       (PAGE_SIZE << THREAD_SIZE_ORDER)
     33
     34/*
     35 * low level task data that entry.S needs immediate access to
     36 * - this struct should fit entirely inside of one cache line
     37 * - this struct shares the supervisor stack pages
     38 * - if the contents of this structure are changed, the assembly constants
     39 *   must also be changed
     40 */
     41#ifndef __ASSEMBLY__
     42
     43struct thread_info {
     44	struct task_struct	*task;		/* main task structure */
     45	unsigned long		flags;		/* low level flags */
     46	__u32			cpu;		/* current CPU */
     47	__s32			preempt_count; /* 0 => preemptable, <0 => BUG */
     48
     49	__u8			supervisor_stack[0];
     50
     51	/* saved context data */
     52	unsigned long           ksp;
     53};
     54#endif
     55
     56/*
     57 * macros/functions for gaining access to the thread information structure
     58 *
     59 * preempt_count needs to be 1 initially, until the scheduler is functional.
     60 */
     61#ifndef __ASSEMBLY__
     62#define INIT_THREAD_INFO(tsk)				\
     63{							\
     64	.task		= &tsk,				\
     65	.flags		= 0,				\
     66	.cpu		= 0,				\
     67	.preempt_count	= INIT_PREEMPT_COUNT,		\
     68	.ksp            = 0,                            \
     69}
     70
     71/* how to get the thread information struct from C */
     72register struct thread_info *current_thread_info_reg asm("r10");
     73#define current_thread_info()   (current_thread_info_reg)
     74
     75#define get_thread_info(ti) get_task_struct((ti)->task)
     76#define put_thread_info(ti) put_task_struct((ti)->task)
     77
     78#endif /* !__ASSEMBLY__ */
     79
     80/*
     81 * thread information flags
     82 *   these are process state flags that various assembly files may need to
     83 *   access
     84 *   - pending work-to-be-done flags are in LSW
     85 *   - other flags in MSW
     86 */
     87#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
     88#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
     89#define TIF_SIGPENDING		2	/* signal pending */
     90#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
     91#define TIF_SINGLESTEP		4	/* restore singlestep on return to user
     92					 * mode
     93					 */
     94#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
     95#define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
     96#define TIF_RESTORE_SIGMASK     9
     97#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling						 * TIF_NEED_RESCHED
     98					 */
     99#define TIF_MEMDIE              17
    100
    101#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
    102#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
    103#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
    104#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
    105#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
    106#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
    107#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
    108
    109
    110/* Work to do when returning from interrupt/exception */
    111/* For OpenRISC, this is anything in the LSW other than syscall trace */
    112#define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
    113
    114#endif /* __KERNEL__ */
    115
    116#endif /* _ASM_THREAD_INFO_H */