/* * include/asm-xtensa/thread_info.h * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2001 - 2005 Tensilica Inc. */ #ifndef _XTENSA_THREAD_INFO_H#define _XTENSA_THREAD_INFO_H #ifdef __KERNEL__ #ifndef __ASSEMBLY__# include <asm/processor.h>#endif /* * 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 * - if the contents of this structure are changed, the assembly constants *   must also be changed */ #ifndef __ASSEMBLY__ struct thread_info {	struct task_struct	*task;		/* main task structure */	struct exec_domain	*exec_domain;	/* execution domain */	unsigned long		flags;		/* low level flags */	unsigned long		status;		/* thread-synchronous flags */	__u32			cpu;		/* current CPU */	__s32			preempt_count;	/* 0 => preemptable,< 0 => BUG*/ 	mm_segment_t		addr_limit;	/* thread address space */	struct restart_block    restart_block;  }; #else /* !__ASSEMBLY__ */ /* offsets into the thread_info struct for assembly code access */#define TI_TASK		 0x00000000#define TI_EXEC_DOMAIN	 0x00000004#define TI_FLAGS	 0x00000008#define TI_STATUS	 0x0000000C#define TI_CPU		 0x00000010#define TI_PRE_COUNT	 0x00000014#define TI_ADDR_LIMIT	 0x00000018#define TI_RESTART_BLOCK 0x000001C #endif #define PREEMPT_ACTIVE		0x10000000 /* * 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) /* how to get the thread information struct from C */static inline struct thread_info *current_thread_info(void){	struct thread_info *ti;	 __asm__("extui %0,a1,0,13\n\t"	         "xor %0, a1, %0" : "=&r" (ti) : );	return ti;} /* thread information allocation */#define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))#define free_thread_info(ti) free_pages((unsigned long) (ti), 1) #else /* !__ASSEMBLY__ */ /* how to get the thread information struct from ASM */#define GET_THREAD_INFO(reg,sp) \	extui reg, sp, 0, 13; \	xor   reg, sp, 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 */#define TIF_SYSCALL_TRACE	0	/* syscall trace active */#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */#define TIF_SIGPENDING		2	/* signal pending */#define TIF_NEED_RESCHED	3	/* rescheduling necessary */#define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */#define TIF_IRET		5	/* return with iret */#define TIF_MEMDIE		6#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */ #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)#define _TIF_IRET		(1<<TIF_IRET)#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG) #define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */#define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */ /* * 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 THREAD_SIZE 8192	//(2*PAGE_SIZE) #endif	/* __KERNEL__ */#endif	/* _XTENSA_THREAD_INFO */