thread_info.h

  1/*
  2 * include/asm-xtensa/thread_info.h
  3 *
  4 * This file is subject to the terms and conditions of the GNU General Public
  5 * License.  See the file "COPYING" in the main directory of this archive
  6 * for more details.
  7 *
  8 * Copyright (C) 2001 - 2005 Tensilica Inc.
  9 */
 10
 11#ifndef _XTENSA_THREAD_INFO_H
 12#define _XTENSA_THREAD_INFO_H
 13
 14#include <linux/stringify.h>
 15#include <asm/kmem_layout.h>
 16
 17#define CURRENT_SHIFT KERNEL_STACK_SHIFT
 18
 19#ifndef __ASSEMBLER__
 20# include <asm/processor.h>
 21#endif
 22
 23/*
 24 * low level task data that entry.S needs immediate access to
 25 * - this struct should fit entirely inside of one cache line
 26 * - this struct shares the supervisor stack pages
 27 * - if the contents of this structure are changed, the assembly constants
 28 *   must also be changed
 29 */
 30
 31#ifndef __ASSEMBLER__
 32
 33#if XTENSA_HAVE_COPROCESSORS
 34
 35typedef struct xtregs_coprocessor {
 36	xtregs_cp0_t cp0;
 37	xtregs_cp1_t cp1;
 38	xtregs_cp2_t cp2;
 39	xtregs_cp3_t cp3;
 40	xtregs_cp4_t cp4;
 41	xtregs_cp5_t cp5;
 42	xtregs_cp6_t cp6;
 43	xtregs_cp7_t cp7;
 44} xtregs_coprocessor_t;
 45
 46#endif
 47
 48struct thread_info {
 49	struct task_struct	*task;		/* main task structure */
 50	unsigned long		flags;		/* low level flags */
 51	unsigned long		status;		/* thread-synchronous flags */
 52	__u32			cpu;		/* current CPU */
 53	__s32			preempt_count;	/* 0 => preemptable,< 0 => BUG*/
 54
 55#if XCHAL_HAVE_EXCLUSIVE
 56	/* result of the most recent exclusive store */
 57	unsigned long		atomctl8;
 58#endif
 59#ifdef CONFIG_USER_ABI_CALL0_PROBE
 60	/* Address where PS.WOE was enabled by the ABI probing code */
 61	unsigned long		ps_woe_fix_addr;
 62#endif
 63
 64	/*
 65	 * If i-th bit is set then coprocessor state is loaded into the
 66	 * coprocessor i on CPU cp_owner_cpu.
 67	 */
 68	unsigned long		cpenable;
 69	u32			cp_owner_cpu;
 70	/* Allocate storage for extra user states and coprocessor states. */
 71#if XTENSA_HAVE_COPROCESSORS
 72	xtregs_coprocessor_t	xtregs_cp;
 73#endif
 74	xtregs_user_t		xtregs_user;
 75};
 76
 77#endif
 78
 79/*
 80 * macros/functions for gaining access to the thread information structure
 81 */
 82
 83#ifndef __ASSEMBLER__
 84
 85#define INIT_THREAD_INFO(tsk)			\
 86{						\
 87	.task		= &tsk,			\
 88	.flags		= 0,			\
 89	.cpu		= 0,			\
 90	.preempt_count	= INIT_PREEMPT_COUNT,	\
 91}
 92
 93/* how to get the thread information struct from C */
 94static __always_inline struct thread_info *current_thread_info(void)
 95{
 96	struct thread_info *ti;
 97	 __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t"
 98	         "xor %0, a1, %0" : "=&r" (ti) : );
 99	return ti;
100}
101
102#else /* !__ASSEMBLER__ */
103
104/* how to get the thread information struct from ASM */
105#define GET_THREAD_INFO(reg,sp) \
106	extui reg, sp, 0, CURRENT_SHIFT; \
107	xor   reg, sp, reg
108#endif
109
110
111/*
112 * thread information flags
113 * - these are process state flags that various assembly files may need to access
114 */
115#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
116#define TIF_SIGPENDING		1	/* signal pending */
117#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
118#define TIF_SINGLESTEP		3	/* restore singlestep on return to user mode */
119#define TIF_SYSCALL_TRACEPOINT	4	/* syscall tracepoint instrumentation */
120#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
121#define TIF_RESTORE_SIGMASK	6	/* restore signal mask in do_signal() */
122#define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
123#define TIF_DB_DISABLED		8	/* debug trap disabled for syscall */
124#define TIF_SYSCALL_AUDIT	9	/* syscall auditing active */
125#define TIF_SECCOMP		10	/* secure computing */
126#define TIF_MEMDIE		11	/* is terminating due to OOM killer */
127
128#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
129#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
130#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
131#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
132#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
133#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
134#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
135#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
136#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
137
138#define _TIF_WORK_MASK		(_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
139				 _TIF_SYSCALL_TRACEPOINT | \
140				 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
141
142#define THREAD_SIZE KERNEL_STACK_SIZE
143#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
144
145#endif	/* _XTENSA_THREAD_INFO */