1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Thread support for the Hexagon architecture
  4 *
  5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
  6 */
  7
  8#ifndef _ASM_THREAD_INFO_H
  9#define _ASM_THREAD_INFO_H
 10
 11#ifdef __KERNEL__
 12
 13#ifndef __ASSEMBLY__
 14#include <asm/processor.h>
 15#include <asm/registers.h>
 16#include <asm/page.h>
 17#endif
 18
 19#define THREAD_SHIFT		12
 20#define THREAD_SIZE		(1<<THREAD_SHIFT)
 21#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)
 22
 23#ifndef __ASSEMBLY__
 24
 25typedef struct {
 26	unsigned long seg;
 27} mm_segment_t;
 28
 29/*
 30 * This is union'd with the "bottom" of the kernel stack.
 31 * It keeps track of thread info which is handy for routines
 32 * to access quickly.
 33 */
 34
 35struct thread_info {
 36	struct task_struct	*task;		/* main task structure */
 37	unsigned long		flags;          /* low level flags */
 38	__u32                   cpu;            /* current cpu */
 39	int                     preempt_count;  /* 0=>preemptible,<0=>BUG */
 40	mm_segment_t            addr_limit;     /* segmentation sux */
 41	/*
 42	 * used for syscalls somehow;
 43	 * seems to have a function pointer and four arguments
 44	 */
 45	/* Points to the current pt_regs frame  */
 46	struct pt_regs		*regs;
 47	/*
 48	 * saved kernel sp at switch_to time;
 49	 * not sure if this is used (it's not in the VM model it seems;
 50	 * see thread_struct)
 51	 */
 52	unsigned long		sp;
 53};
 54
 55#else /* !__ASSEMBLY__ */
 56
 57#include <asm/asm-offsets.h>
 58
 59#endif  /* __ASSEMBLY__  */
 60
 61#ifndef __ASSEMBLY__
 62
 63#define INIT_THREAD_INFO(tsk)                   \
 64{                                               \
 65	.task           = &tsk,                 \
 66	.flags          = 0,                    \
 67	.cpu            = 0,                    \
 68	.preempt_count  = 1,                    \
 69	.addr_limit     = KERNEL_DS,            \
 70	.sp = 0,				\
 71	.regs = NULL,			\
 72}
 73
 74/* Tacky preprocessor trickery */
 75#define	qqstr(s) qstr(s)
 76#define qstr(s) #s
 77#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
 78
 79register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
 80#define current_thread_info()  __current_thread_info
 81
 82#endif /* __ASSEMBLY__ */
 83
 84/*
 85 * thread information flags
 86 * - these are process state flags that various assembly files
 87 *   may need to access
 88 * - pending work-to-be-done flags are in LSW
 89 * - other flags in MSW
 90 */
 91
 92#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 93#define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
 94#define TIF_SIGPENDING          2       /* signal pending */
 95#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 96#define TIF_SINGLESTEP          4       /* restore ss @ return to usr mode */
 97#define TIF_RESTORE_SIGMASK     6       /* restore sig mask in do_signal() */
 98/* true if poll_idle() is polling TIF_NEED_RESCHED */
 99#define TIF_MEMDIE              17      /* OOM killer killed process */
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
107/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
108#define _TIF_WORK_MASK          (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
109
110/* work to do on any return to u-space */
111#define _TIF_ALLWORK_MASK       0x0000FFFF
112
113#endif /* __KERNEL__ */
114
115#endif