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Diffstat (limited to 'include/asm-arm26/thread_info.h')
| -rw-r--r-- | include/asm-arm26/thread_info.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/include/asm-arm26/thread_info.h b/include/asm-arm26/thread_info.h new file mode 100644 index 000000000000..50f41b50268a --- /dev/null +++ b/include/asm-arm26/thread_info.h @@ -0,0 +1,144 @@ +/* + * linux/include/asm-arm26/thread_info.h + * + * Copyright (C) 2002 Russell King. + * Copyright (C) 2003 Ian Molton. + * + * 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__ + +#ifndef __ASSEMBLY__ + +struct task_struct; +struct exec_domain; + +#include <linux/compiler.h> +#include <asm/fpstate.h> +#include <asm/ptrace.h> +#include <asm/types.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; +}; + +/* + * low level task data that entry.S needs immediate access to. + * We assume cpu_context follows immedately after cpu_domain. + */ +struct thread_info { + unsigned long flags; /* low level flags */ + __s32 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 */ + struct cpu_context_save cpu_context; /* cpu context */ + struct restart_block restart_block; + union fp_state fpstate; +}; + +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task &tsk, \ + .exec_domain &default_exec_domain, \ + .flags 0, \ + .preempt_count 0, \ + .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) __attribute_const__; + +static inline struct thread_info *current_thread_info(void) +{ + register unsigned long sp asm ("sp"); + return (struct thread_info *)(sp & ~0x1fff); +} + +/* FIXME - PAGE_SIZE < 32K */ +#define THREAD_SIZE (8*32768) // FIXME - this needs attention (see kernel/fork.c which gets a nice div by zero if this is lower than 8*32768 +#define __get_user_regs(x) (((struct pt_regs *)((unsigned long)(x) + THREAD_SIZE - 8)) - 1) + +extern struct thread_info *alloc_thread_info(struct task_struct *task); +extern void free_thread_info(struct thread_info *); + +#define get_thread_info(ti) get_task_struct((ti)->task) +#define put_thread_info(ti) put_task_struct((ti)->task) + +#define thread_saved_pc(tsk) \ + ((unsigned long)(pc_pointer((tsk)->thread_info->cpu_context.pc))) +#define thread_saved_fp(tsk) \ + ((unsigned long)((tsk)->thread_info->cpu_context.fp)) + +#else /* !__ASSEMBLY__ */ + +#define TI_FLAGS 0 +#define TI_PREEMPT 4 +#define TI_ADDR_LIMIT 8 +#define TI_TASK 12 +#define TI_EXEC_DOMAIN 16 +#define TI_CPU 20 +#define TI_CPU_SAVE 24 +#define TI_RESTART_BLOCK 28 +#define TI_FPSTATE 68 + +#endif + +#define PREEMPT_ACTIVE 0x04000000 + +/* + * thread information flags: + * TIF_SYSCALL_TRACE - syscall trace active + * TIF_NOTIFY_RESUME - resumption notification requested + * 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_NOTIFY_RESUME 0 +#define TIF_SIGPENDING 1 +#define TIF_NEED_RESCHED 2 +#define TIF_SYSCALL_TRACE 8 +#define TIF_USED_FPU 16 +#define TIF_POLLING_NRFLAG 17 +#define TIF_MEMDIE 18 + +#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) +#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) +#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) +#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) +#define _TIF_USED_FPU (1 << TIF_USED_FPU) +#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) + +/* + * Change these and you break ASM code in entry-common.S + */ +#define _TIF_WORK_MASK 0x000000ff + +#endif /* __KERNEL__ */ +#endif /* __ASM_ARM_THREAD_INFO_H */ |