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Diffstat (limited to 'kernel/arch/mn10300/include/asm/thread_info.h')
| -rw-r--r-- | kernel/arch/mn10300/include/asm/thread_info.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/kernel/arch/mn10300/include/asm/thread_info.h b/kernel/arch/mn10300/include/asm/thread_info.h new file mode 100644 index 000000000..4861a78c7 --- /dev/null +++ b/kernel/arch/mn10300/include/asm/thread_info.h @@ -0,0 +1,162 @@ +/* MN10300 Low-level thread information + * + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ + +#ifndef _ASM_THREAD_INFO_H +#define _ASM_THREAD_INFO_H + +#ifdef __KERNEL__ + +#include <asm/page.h> + +#ifdef CONFIG_4KSTACKS +#define THREAD_SIZE (4096) +#define THREAD_SIZE_ORDER (0) +#else +#define THREAD_SIZE (8192) +#define THREAD_SIZE_ORDER (1) +#endif + +#define STACK_WARN (THREAD_SIZE / 8) + +/* + * 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 struct { + unsigned long seg; +} mm_segment_t; + +struct thread_info { + struct task_struct *task; /* main task structure */ + struct pt_regs *frame; /* current exception frame */ + 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: + 0-0xBFFFFFFF for user-thead + 0-0xFFFFFFFF for kernel-thread + */ + + __u8 supervisor_stack[0]; +}; + +#define thread_info_to_uregs(ti) \ + ((struct pt_regs *) \ + ((unsigned long)ti + THREAD_SIZE - sizeof(struct pt_regs))) + +#else /* !__ASSEMBLY__ */ + +#ifndef __ASM_OFFSETS_H__ +#include <asm/asm-offsets.h> +#endif + +#endif + +/* + * macros/functions for gaining access to the thread information structure + */ +#ifndef __ASSEMBLY__ + +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task = &tsk, \ + .flags = 0, \ + .cpu = 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) +#define init_uregs \ + ((struct pt_regs *) \ + ((unsigned long) init_stack + THREAD_SIZE - sizeof(struct pt_regs))) + +extern struct thread_info *__current_ti; + +/* how to get the thread information struct from C */ +static inline __attribute__((const)) +struct thread_info *current_thread_info(void) +{ + struct thread_info *ti; + asm("mov sp,%0\n" + "and %1,%0\n" + : "=d" (ti) + : "i" (~(THREAD_SIZE - 1)) + : "cc"); + return ti; +} + +static inline __attribute__((const)) +struct pt_regs *current_frame(void) +{ + return current_thread_info()->frame; +} + +/* how to get the current stack pointer from C */ +static inline unsigned long current_stack_pointer(void) +{ + unsigned long sp; + asm("mov sp,%0; ":"=r" (sp)); + return sp; +} + +#ifndef CONFIG_KGDB +void arch_release_thread_info(struct thread_info *ti); +#endif +#define get_thread_info(ti) get_task_struct((ti)->task) +#define put_thread_info(ti) put_task_struct((ti)->task) + +#else /* !__ASSEMBLY__ */ + +#ifndef __VMLINUX_LDS__ +/* how to get the thread information struct from ASM */ +.macro GET_THREAD_INFO reg + mov sp,\reg + and -THREAD_SIZE,\reg +.endm +#endif +#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_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */ +#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ +#define TIF_MEMDIE 17 /* is terminating due to OOM killer */ + +#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) + +#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 */ + +#endif /* __KERNEL__ */ + +#endif /* _ASM_THREAD_INFO_H */ |