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Diffstat (limited to 'arch/openrisc/include/asm/thread_info.h')
| -rw-r--r-- | arch/openrisc/include/asm/thread_info.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/openrisc/include/asm/thread_info.h b/arch/openrisc/include/asm/thread_info.h new file mode 100644 index 000000000..5c15dfa2f --- /dev/null +++ b/arch/openrisc/include/asm/thread_info.h @@ -0,0 +1,125 @@ +/* + * OpenRISC Linux + * + * Linux architectural port borrowing liberally from similar works of + * others. All original copyrights apply as per the original source + * declaration. + * + * OpenRISC implementation: + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> + * et al. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#ifndef _ASM_THREAD_INFO_H +#define _ASM_THREAD_INFO_H + +#ifdef __KERNEL__ + +#ifndef __ASSEMBLY__ +#include <asm/types.h> +#include <asm/processor.h> +#endif + + +/* THREAD_SIZE is the size of the task_struct/kernel_stack combo. + * normally, the stack is found by doing something like p + THREAD_SIZE + * in or32, a page is 8192 bytes, which seems like a sane size + */ + +#define THREAD_SIZE_ORDER 0 +#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) + +/* + * 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__ + +typedef unsigned long mm_segment_t; + +struct thread_info { + struct task_struct *task; /* main task structure */ + unsigned long flags; /* low level flags */ + __u32 cpu; /* current CPU */ + __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ + + mm_segment_t addr_limit; /* thread address space: + 0-0x7FFFFFFF for user-thead + 0-0xFFFFFFFF for kernel-thread + */ + __u8 supervisor_stack[0]; + + /* saved context data */ + unsigned long ksp; +}; +#endif + +/* + * 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, \ + .flags = 0, \ + .cpu = 0, \ + .preempt_count = INIT_PREEMPT_COUNT, \ + .addr_limit = KERNEL_DS, \ + .ksp = 0, \ +} + +/* how to get the thread information struct from C */ +register struct thread_info *current_thread_info_reg asm("r10"); +#define current_thread_info() (current_thread_info_reg) + +#define get_thread_info(ti) get_task_struct((ti)->task) +#define put_thread_info(ti) put_task_struct((ti)->task) + +#endif /* !__ASSEMBLY__ */ + +/* + * 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_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ +#define TIF_RESTORE_SIGMASK 9 +#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling * TIF_NEED_RESCHED + */ +#define TIF_MEMDIE 17 + +#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_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) + + +/* Work to do when returning from interrupt/exception */ +/* For OpenRISC, this is anything in the LSW other than syscall trace */ +#define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP)) + +#endif /* __KERNEL__ */ + +#endif /* _ASM_THREAD_INFO_H */ |