| /* thread_info.h: MIPS low-level thread information |
| * |
| * Copyright (C) 2002 David Howells (dhowells@redhat.com) |
| * - Incorporating suggestions made by Linus Torvalds and Dave Miller |
| */ |
| |
| #ifndef _ASM_THREAD_INFO_H |
| #define _ASM_THREAD_INFO_H |
| |
| #ifdef __KERNEL__ |
| |
| |
| #ifndef __ASSEMBLY__ |
| |
| #include <asm/processor.h> |
| |
| /* |
| * 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 |
| */ |
| struct thread_info { |
| struct task_struct *task; /* main task structure */ |
| struct exec_domain *exec_domain; /* execution domain */ |
| unsigned long flags; /* low level flags */ |
| unsigned long tp_value; /* thread pointer */ |
| __u32 cpu; /* current CPU */ |
| int 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; |
| struct pt_regs *regs; |
| }; |
| |
| /* |
| * macros/functions for gaining access to the thread information structure |
| */ |
| #define INIT_THREAD_INFO(tsk) \ |
| { \ |
| .task = &tsk, \ |
| .exec_domain = &default_exec_domain, \ |
| .flags = _TIF_FIXADE, \ |
| .cpu = 0, \ |
| .preempt_count = INIT_PREEMPT_COUNT, \ |
| .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. */ |
| register struct thread_info *__current_thread_info __asm__("$28"); |
| #define current_thread_info() __current_thread_info |
| |
| /* thread information allocation */ |
| #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT) |
| #define THREAD_SIZE_ORDER (1) |
| #endif |
| #if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT) |
| #define THREAD_SIZE_ORDER (2) |
| #endif |
| #ifdef CONFIG_PAGE_SIZE_8KB |
| #define THREAD_SIZE_ORDER (1) |
| #endif |
| #ifdef CONFIG_PAGE_SIZE_16KB |
| #define THREAD_SIZE_ORDER (0) |
| #endif |
| #ifdef CONFIG_PAGE_SIZE_32KB |
| #define THREAD_SIZE_ORDER (0) |
| #endif |
| #ifdef CONFIG_PAGE_SIZE_64KB |
| #define THREAD_SIZE_ORDER (0) |
| #endif |
| |
| #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) |
| #define THREAD_MASK (THREAD_SIZE - 1UL) |
| |
| #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR |
| |
| #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(info) kfree(info) |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #define PREEMPT_ACTIVE 0x10000000 |
| |
| /* |
| * 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_SIGPENDING 1 /* signal pending */ |
| #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ |
| #define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */ |
| #define TIF_SECCOMP 4 /* secure computing */ |
| #define TIF_NOTIFY_RESUME 5 /* callback before returning to user */ |
| #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ |
| #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 /* is terminating due to OOM killer */ |
| #define TIF_FREEZE 19 |
| #define TIF_FIXADE 20 /* Fix address errors in software */ |
| #define TIF_LOGADE 21 /* Log address errors to syslog */ |
| #define TIF_32BIT_REGS 22 /* also implies 16/32 fprs */ |
| #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */ |
| #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */ |
| #define TIF_LOAD_WATCH 25 /* If set, load watch registers */ |
| #define TIF_SYSCALL_TRACE 31 /* syscall trace active */ |
| |
| #ifdef CONFIG_MIPS32_O32 |
| #define TIF_32BIT TIF_32BIT_REGS |
| #elif defined(CONFIG_MIPS32_N32) |
| #define TIF_32BIT _TIF_32BIT_ADDR |
| #endif /* CONFIG_MIPS32_O32 */ |
| |
| #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
| #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
| #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
| #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
| #define _TIF_SECCOMP (1<<TIF_SECCOMP) |
| #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) |
| #define _TIF_USEDFPU (1<<TIF_USEDFPU) |
| #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) |
| #define _TIF_FREEZE (1<<TIF_FREEZE) |
| #define _TIF_FIXADE (1<<TIF_FIXADE) |
| #define _TIF_LOGADE (1<<TIF_LOGADE) |
| #define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS) |
| #define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR) |
| #define _TIF_FPUBOUND (1<<TIF_FPUBOUND) |
| #define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH) |
| |
| /* work to do on interrupt/exception return */ |
| #define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP) |
| /* work to do on any return to u-space */ |
| #define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP) |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _ASM_THREAD_INFO_H */ |