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 unsigned long flags; /* low level flags */ 30 unsigned long status; /* thread-synchronous flags */ 31 __u32 homecache_cpu; /* CPU we are homecached on */ 32 __u32 cpu; /* current CPU */ 33 int preempt_count; /* 0 => preemptable, 34 <0 => BUG */ 35 36 mm_segment_t addr_limit; /* thread address space 37 (KERNEL_DS or USER_DS) */ 38 struct single_step_state *step_state; /* single step state 39 (if non-zero) */ 40 int align_ctl; /* controls unaligned access */ 41#ifdef __tilegx__ 42 unsigned long unalign_jit_tmp[4]; /* temp r0..r3 storage */ 43 void __user *unalign_jit_base; /* unalign fixup JIT base */ 44#endif 45}; 46 47/* 48 * macros/functions for gaining access to the thread information structure. 49 */ 50#define INIT_THREAD_INFO(tsk) \ 51{ \ 52 .task = &tsk, \ 53 .flags = 0, \ 54 .cpu = 0, \ 55 .preempt_count = INIT_PREEMPT_COUNT, \ 56 .addr_limit = KERNEL_DS, \ 57 .step_state = NULL, \ 58 .align_ctl = 0, \ 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#define THREAD_SIZE_PAGES (1 << THREAD_SIZE_ORDER) 72 73#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 74#define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER) 75 76#define STACK_WARN (THREAD_SIZE/8) 77 78#ifndef __ASSEMBLY__ 79 80void arch_release_thread_info(struct thread_info *info); 81 82/* How to get the thread information struct from C. */ 83register unsigned long stack_pointer __asm__("sp"); 84 85#define current_thread_info() \ 86 ((struct thread_info *)(stack_pointer & -THREAD_SIZE)) 87 88/* Sit on a nap instruction until interrupted. */ 89extern void smp_nap(void); 90 91/* Enable interrupts racelessly and nap forever: helper for arch_cpu_idle(). */ 92extern void _cpu_idle(void); 93 94#else /* __ASSEMBLY__ */ 95 96/* 97 * How to get the thread information struct from assembly. 98 * Note that we use different macros since different architectures 99 * have different semantics in their "mm" instruction and we would 100 * like to guarantee that the macro expands to exactly one instruction. 101 */ 102#ifdef __tilegx__ 103#define EXTRACT_THREAD_INFO(reg) mm reg, zero, LOG2_THREAD_SIZE, 63 104#else 105#define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31 106#endif 107 108#endif /* !__ASSEMBLY__ */ 109 110/* 111 * Thread information flags that various assembly files may need to access. 112 * Keep flags accessed frequently in low bits, particular since it makes 113 * it easier to build constants in assembly. 114 */ 115#define TIF_SIGPENDING 0 /* signal pending */ 116#define TIF_NEED_RESCHED 1 /* rescheduling necessary */ 117#define TIF_SINGLESTEP 2 /* restore singlestep on return to 118 user mode */ 119#define TIF_ASYNC_TLB 3 /* got an async TLB fault in kernel */ 120#define TIF_SYSCALL_TRACE 4 /* syscall trace active */ 121#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 122#define TIF_SECCOMP 6 /* secure computing */ 123#define TIF_MEMDIE 7 /* OOM killer at work */ 124#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */ 125#define TIF_SYSCALL_TRACEPOINT 9 /* syscall tracepoint instrumentation */ 126#define TIF_POLLING_NRFLAG 10 /* idle is polling for TIF_NEED_RESCHED */ 127#define TIF_NOHZ 11 /* in adaptive nohz mode */ 128 129#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 130#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 131#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 132#define _TIF_ASYNC_TLB (1<<TIF_ASYNC_TLB) 133#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 134#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 135#define _TIF_SECCOMP (1<<TIF_SECCOMP) 136#define _TIF_MEMDIE (1<<TIF_MEMDIE) 137#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 138#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 139#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 140#define _TIF_NOHZ (1<<TIF_NOHZ) 141 142/* Work to do on any return to user space. */ 143#define _TIF_ALLWORK_MASK \ 144 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_SINGLESTEP | \ 145 _TIF_ASYNC_TLB | _TIF_NOTIFY_RESUME | _TIF_NOHZ) 146 147/* Work to do at syscall entry. */ 148#define _TIF_SYSCALL_ENTRY_WORK \ 149 (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_NOHZ) 150 151/* Work to do at syscall exit. */ 152#define _TIF_SYSCALL_EXIT_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT) 153 154/* 155 * Thread-synchronous status. 156 * 157 * This is different from the flags in that nobody else 158 * ever touches our thread-synchronous status, so we don't 159 * have to worry about atomic accesses. 160 */ 161#ifdef __tilegx__ 162#define TS_COMPAT 0x0001 /* 32-bit compatibility mode */ 163#endif 164#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal */ 165 166#ifndef __ASSEMBLY__ 167#define HAVE_SET_RESTORE_SIGMASK 1 168static inline void set_restore_sigmask(void) 169{ 170 struct thread_info *ti = current_thread_info(); 171 ti->status |= TS_RESTORE_SIGMASK; 172 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags)); 173} 174static inline void clear_restore_sigmask(void) 175{ 176 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 177} 178static inline bool test_restore_sigmask(void) 179{ 180 return current_thread_info()->status & TS_RESTORE_SIGMASK; 181} 182static inline bool test_and_clear_restore_sigmask(void) 183{ 184 struct thread_info *ti = current_thread_info(); 185 if (!(ti->status & TS_RESTORE_SIGMASK)) 186 return false; 187 ti->status &= ~TS_RESTORE_SIGMASK; 188 return true; 189} 190#endif /* !__ASSEMBLY__ */ 191 192#endif /* _ASM_TILE_THREAD_INFO_H */ 193