/* * linux/include/asm-arm/thread_info.h * * Copyright (C) 2002 Russell King. * * 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 __ASM_ARM_THREAD_INFO_H #define __ASM_ARM_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; struct exec_domain; #include <asm/types.h> #include <asm/domain.h> typedef unsigned long mm_segment_t; struct cpu_context_save { __u32 r4; __u32 r5; __u32 r6; __u32 r7; __u32 r8; __u32 r9; __u32 sl; __u32 fp; __u32 sp; __u32 pc; __u32 extra[2]; /* Xscale 'acc' register, etc */ }; /* * 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 */ struct exec_domain *exec_domain; /* execution domain */ __u32 cpu; /* cpu */ __u32 cpu_domain; /* cpu domain */ struct cpu_context_save cpu_context; /* cpu context */ __u32 syscall; /* syscall number */ __u8 used_cp[16]; /* thread used copro */ unsigned long tp_value; struct crunch_state crunchstate; union fp_state fpstate __attribute__((aligned(8))); union vfp_state vfpstate; struct restart_block restart_block; }; #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .exec_domain = &default_exec_domain, \ .flags = 0, \ .preempt_count = 1, \ .addr_limit = KERNEL_DS, \ .cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ domain_val(DOMAIN_IO, DOMAIN_CLIENT), \ .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) __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)); } /* thread information allocation */ #ifdef CONFIG_DEBUG_STACK_USAGE #define alloc_thread_info(tsk) \ ((struct thread_info *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, \ THREAD_SIZE_ORDER)) #else #define alloc_thread_info(tsk) \ ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER)) #endif #define free_thread_info(info) \ free_pages((unsigned long)info, THREAD_SIZE_ORDER); #define thread_saved_pc(tsk) \ ((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc))) #define thread_saved_fp(tsk) \ ((unsigned long)(task_thread_info(tsk)->cpu_context.fp)) extern void crunch_task_disable(struct thread_info *); extern void crunch_task_copy(struct thread_info *, void *); extern void crunch_task_restore(struct thread_info *, void *); extern void crunch_task_release(struct thread_info *); extern void iwmmxt_task_disable(struct thread_info *); extern void iwmmxt_task_copy(struct thread_info *, void *); extern void iwmmxt_task_restore(struct thread_info *, void *); extern void iwmmxt_task_release(struct thread_info *); extern void iwmmxt_task_switch(struct thread_info *); #endif /* * We use bit 30 of the preempt_count to indicate that kernel * preemption is occurring. See include/asm-arm/hardirq.h. */ #define PREEMPT_ACTIVE 0x40000000 /* * thread information flags: * TIF_SYSCALL_TRACE - syscall trace active * TIF_SIGPENDING - signal pending * TIF_NEED_RESCHED - rescheduling necessary * TIF_USEDFPU - FPU was used by this task this quantum (SMP) * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_SIGPENDING 0 #define TIF_NEED_RESCHED 1 #define TIF_SYSCALL_TRACE 8 #define TIF_POLLING_NRFLAG 16 #define TIF_USING_IWMMXT 17 #define TIF_MEMDIE 18 #define TIF_FREEZE 19 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT) #define _TIF_FREEZE (1 << TIF_FREEZE) /* * Change these and you break ASM code in entry-common.S */ #define _TIF_WORK_MASK 0x000000ff #endif /* __KERNEL__ */ #endif /* __ASM_ARM_THREAD_INFO_H */