#ifndef __ASM_SH_THREAD_INFO_H #define __ASM_SH_THREAD_INFO_H /* SuperH version * Copyright (C) 2002 Niibe Yutaka * * The copyright of original i386 version is: * * Copyright (C) 2002 David Howells (dhowells@redhat.com) * - Incorporating suggestions made by Linus Torvalds and Dave Miller */ #ifdef __KERNEL__ #include <asm/page.h> #ifndef __ASSEMBLY__ #include <asm/processor.h> 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; int preempt_count; /* 0 => preemptable, <0 => BUG */ mm_segment_t addr_limit; /* thread address space */ struct restart_block restart_block; unsigned long previous_sp; /* sp of previous stack in case of nested IRQ stacks */ __u8 supervisor_stack[0]; }; #endif #define PREEMPT_ACTIVE 0x10000000 #if defined(CONFIG_4KSTACKS) #define THREAD_SIZE_ORDER (0) #elif defined(CONFIG_PAGE_SIZE_4KB) #define THREAD_SIZE_ORDER (1) #elif defined(CONFIG_PAGE_SIZE_8KB) #define THREAD_SIZE_ORDER (1) #elif defined(CONFIG_PAGE_SIZE_64KB) #define THREAD_SIZE_ORDER (0) #else #error "Unknown thread size" #endif #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) #define STACK_WARN (THREAD_SIZE >> 3) /* * macros/functions for gaining access to the thread information structure */ #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) /* how to get the current stack pointer from C */ register unsigned long current_stack_pointer asm("r15") __used; /* how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) { struct thread_info *ti; #if defined(CONFIG_SUPERH64) __asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti)); #elif defined(CONFIG_CPU_HAS_SR_RB) __asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti)); #else unsigned long __dummy; __asm__ __volatile__ ( "mov r15, %0\n\t" "and %1, %0\n\t" : "=&r" (ti), "=r" (__dummy) : "1" (~(THREAD_SIZE - 1)) : "memory"); #endif return ti; } /* thread information allocation */ #ifdef CONFIG_DEBUG_STACK_USAGE #define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL) #else #define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL) #endif #define free_thread_info(ti) kfree(ti) #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_SIGPENDING 1 /* signal pending */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ #define TIF_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */ #define TIF_SINGLESTEP 4 /* singlestepping active */ #define TIF_SYSCALL_AUDIT 5 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_MEMDIE 18 #define TIF_FREEZE 19 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) #define _TIF_USEDFPU (1<<TIF_USEDFPU) #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) #define _TIF_FREEZE (1<<TIF_FREEZE) #define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */ #define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */ #endif /* __KERNEL__ */ #endif /* __ASM_SH_THREAD_INFO_H */