1/* 2 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 3 * Copyright 2010 Tilera Corporation. All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License 7 * as published by the Free Software Foundation, version 2. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 12 * NON INFRINGEMENT. See the GNU General Public License for 13 * more details. 14 */ 15 16#ifndef _ASM_TILE_THREAD_INFO_H 17#define _ASM_TILE_THREAD_INFO_H 18 19#include <asm/processor.h> 20#include <asm/page.h> 21#ifndef __ASSEMBLY__ 22 23/* 24 * Low level task data that assembly code needs immediate access to. 25 * The structure is placed at the bottom of the supervisor stack. 26 */ 27struct thread_info { 28 struct task_struct *task; /* main task structure */ 29 struct exec_domain *exec_domain; /* execution domain */ 30 unsigned long flags; /* low level flags */ 31 unsigned long status; /* thread-synchronous flags */ 32 __u32 homecache_cpu; /* CPU we are homecached on */ 33 __u32 cpu; /* current CPU */ 34 int preempt_count; /* 0 => preemptable, 35 <0 => BUG */ 36 37 mm_segment_t addr_limit; /* thread address space 38 (KERNEL_DS or USER_DS) */ 39 struct restart_block restart_block; 40 struct single_step_state *step_state; /* single step state 41 (if non-zero) */ 42}; 43 44/* 45 * macros/functions for gaining access to the thread information structure. 46 */ 47#define INIT_THREAD_INFO(tsk) \ 48{ \ 49 .task = &tsk, \ 50 .exec_domain = &default_exec_domain, \ 51 .flags = 0, \ 52 .cpu = 0, \ 53 .preempt_count = INIT_PREEMPT_COUNT, \ 54 .addr_limit = KERNEL_DS, \ 55 .restart_block = { \ 56 .fn = do_no_restart_syscall, \ 57 }, \ 58 .step_state = NULL, \ 59} 60 61#define init_thread_info (init_thread_union.thread_info) 62#define init_stack (init_thread_union.stack) 63 64#endif /* !__ASSEMBLY__ */ 65 66#if PAGE_SIZE < 8192 67#define THREAD_SIZE_ORDER (13 - PAGE_SHIFT) 68#else 69#define THREAD_SIZE_ORDER (0) 70#endif 71 72#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 73#define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER) 74 75#define STACK_WARN (THREAD_SIZE/8) 76 77#ifndef __ASSEMBLY__ 78 79/* How to get the thread information struct from C. */ 80register unsigned long stack_pointer __asm__("sp"); 81 82#define current_thread_info() \ 83 ((struct thread_info *)(stack_pointer & -THREAD_SIZE)) 84 85#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 86extern struct thread_info *alloc_thread_info(struct task_struct *task); 87extern void free_thread_info(struct thread_info *info); 88 89/* Sit on a nap instruction until interrupted. */ 90extern void smp_nap(void); 91 92/* Enable interrupts racelessly and nap forever: helper for cpu_idle(). */ 93extern void _cpu_idle(void); 94 95/* Switch boot idle thread to a freshly-allocated stack and free old stack. */ 96extern void cpu_idle_on_new_stack(struct thread_info *old_ti, 97 unsigned long new_sp, 98 unsigned long new_ss10); 99 100#else /* __ASSEMBLY__ */ 101 102/* how to get the thread information struct from ASM */ 103#ifdef __tilegx__ 104#define GET_THREAD_INFO(reg) move reg, sp; mm reg, zero, LOG2_THREAD_SIZE, 63 105#else 106#define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31 107#endif 108 109#endif /* !__ASSEMBLY__ */ 110 111#define PREEMPT_ACTIVE 0x10000000 112 113/* 114 * Thread information flags that various assembly files may need to access. 115 * Keep flags accessed frequently in low bits, particular since it makes 116 * it easier to build constants in assembly. 117 */ 118#define TIF_SIGPENDING 0 /* signal pending */ 119#define TIF_NEED_RESCHED 1 /* rescheduling necessary */ 120#define TIF_SINGLESTEP 2 /* restore singlestep on return to 121 user mode */ 122#define TIF_ASYNC_TLB 3 /* got an async TLB fault in kernel */ 123#define TIF_SYSCALL_TRACE 4 /* syscall trace active */ 124#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 125#define TIF_SECCOMP 6 /* secure computing */ 126#define TIF_MEMDIE 7 /* OOM killer at work */ 127 128#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 129#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 130#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 131#define _TIF_ASYNC_TLB (1<<TIF_ASYNC_TLB) 132#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 133#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 134#define _TIF_SECCOMP (1<<TIF_SECCOMP) 135#define _TIF_MEMDIE (1<<TIF_MEMDIE) 136 137/* Work to do on any return to user space. */ 138#define _TIF_ALLWORK_MASK \ 139 (_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SINGLESTEP|_TIF_ASYNC_TLB) 140 141/* 142 * Thread-synchronous status. 143 * 144 * This is different from the flags in that nobody else 145 * ever touches our thread-synchronous status, so we don't 146 * have to worry about atomic accesses. 147 */ 148#ifdef __tilegx__ 149#define TS_COMPAT 0x0001 /* 32-bit compatibility mode */ 150#endif 151#define TS_POLLING 0x0004 /* in idle loop but not sleeping */ 152#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal */ 153 154#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING) 155 156#ifndef __ASSEMBLY__ 157#define HAVE_SET_RESTORE_SIGMASK 1 158static inline void set_restore_sigmask(void) 159{ 160 struct thread_info *ti = current_thread_info(); 161 ti->status |= TS_RESTORE_SIGMASK; 162 set_bit(TIF_SIGPENDING, &ti->flags); 163} 164#endif /* !__ASSEMBLY__ */ 165 166#endif /* _ASM_TILE_THREAD_INFO_H */ 167