/* 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> #ifndef __ASSEMBLY__ #include <asm/processor.h> #endif #define PREEMPT_ACTIVE 0x10000000 #ifdef CONFIG_4KSTACKS #define THREAD_SIZE (4096) #else #define THREAD_SIZE (8192) #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__ struct thread_info { struct task_struct *task; /* main task structure */ struct exec_domain *exec_domain; /* execution domain */ 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 */ struct restart_block restart_block; __u8 supervisor_stack[0]; }; #else /* !__ASSEMBLY__ */ #ifndef __ASM_OFFSETS_H__ #include <asm/asm-offsets.h> #endif #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, \ .exec_domain = &default_exec_domain, \ .flags = 0, \ .cpu = 0, \ .preempt_count = 1, \ .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) #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; } /* 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; } #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR /* thread information allocation */ #ifdef CONFIG_DEBUG_STACK_USAGE #define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL) #else #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) #endif #define free_thread_info(ti) kfree((ti)) #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 /* OOM killer killed process */ #define TIF_FREEZE 18 /* freezing for suspend */ #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_RESTORE_SIGMASK +(1 << TIF_RESTORE_SIGMASK) #define _TIF_POLLING_NRFLAG +(1 << TIF_POLLING_NRFLAG) #define _TIF_FREEZE +(1 << TIF_FREEZE) #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 */