/* * linux/arch/unicore32/include/asm/thread_info.h * * Code specific to PKUnity SoC and UniCore ISA * * Copyright (C) 2001-2010 GUAN Xue-tao * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef __UNICORE_THREAD_INFO_H__ #define __UNICORE_THREAD_INFO_H__ #ifdef __KERNEL__ #include <linux/compiler.h> #include <asm/fpstate.h> #define THREAD_SIZE_ORDER 1 #define THREAD_SIZE 8192 #define THREAD_START_SP (THREAD_SIZE - 8) #ifndef __ASSEMBLY__ struct task_struct; #include <asm/types.h> typedef struct { unsigned long seg; } mm_segment_t; struct cpu_context_save { __u32 r4; __u32 r5; __u32 r6; __u32 r7; __u32 r8; __u32 r9; __u32 r10; __u32 r11; __u32 r12; __u32 r13; __u32 r14; __u32 r15; __u32 r16; __u32 r17; __u32 r18; __u32 r19; __u32 r20; __u32 r21; __u32 r22; __u32 r23; __u32 r24; __u32 r25; __u32 r26; __u32 fp; __u32 sp; __u32 pc; }; /* * low level task data that entry.S needs immediate access to. * __switch_to() assumes cpu_context follows immediately after cpu_domain. */ struct thread_info { unsigned long flags; /* low level flags */ int preempt_count; /* 0 => preemptable */ /* <0 => bug */ mm_segment_t addr_limit; /* address limit */ struct task_struct *task; /* main task structure */ __u32 cpu; /* cpu */ struct cpu_context_save cpu_context; /* cpu context */ __u32 syscall; /* syscall number */ __u8 used_cp[16]; /* thread used copro */ #ifdef CONFIG_UNICORE_FPU_F64 struct fp_state fpstate __attribute__((aligned(8))); #endif }; #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .flags = 0, \ .preempt_count = INIT_PREEMPT_COUNT, \ .addr_limit = KERNEL_DS, \ } #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) __attribute_const__; static inline struct thread_info *current_thread_info(void) { register unsigned long sp asm ("sp"); return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); } #define thread_saved_pc(tsk) \ ((unsigned long)(task_thread_info(tsk)->cpu_context.pc)) #define thread_saved_sp(tsk) \ ((unsigned long)(task_thread_info(tsk)->cpu_context.sp)) #define thread_saved_fp(tsk) \ ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) #endif /* * thread information flags: * TIF_SYSCALL_TRACE - syscall trace active * TIF_SIGPENDING - signal pending * TIF_NEED_RESCHED - rescheduling necessary * TIF_NOTIFY_RESUME - callback before returning to user */ #define TIF_SIGPENDING 0 #define TIF_NEED_RESCHED 1 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ #define TIF_SYSCALL_TRACE 8 #define TIF_MEMDIE 18 #define TIF_RESTORE_SIGMASK 20 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) /* * Change these and you break ASM code in entry-common.S */ #define _TIF_WORK_MASK \ (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME) #endif /* __KERNEL__ */ #endif /* __UNICORE_THREAD_INFO_H__ */