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 */ 27 struct 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 bool in_backtrace; /* currently doing backtrace? */ 46 }; 47 48 /* 49 * macros/functions for gaining access to the thread information structure. 50 */ 51 #define INIT_THREAD_INFO(tsk) \ 52 { \ 53 .task = &tsk, \ 54 .flags = 0, \ 55 .cpu = 0, \ 56 .preempt_count = INIT_PREEMPT_COUNT, \ 57 .addr_limit = KERNEL_DS, \ 58 .step_state = NULL, \ 59 .align_ctl = 0, \ 60 } 61 62 #define init_thread_info (init_thread_union.thread_info) 63 #define init_stack (init_thread_union.stack) 64 65 #endif /* !__ASSEMBLY__ */ 66 67 #if PAGE_SIZE < 8192 68 #define THREAD_SIZE_ORDER (13 - PAGE_SHIFT) 69 #else 70 #define THREAD_SIZE_ORDER (0) 71 #endif 72 #define THREAD_SIZE_PAGES (1 << THREAD_SIZE_ORDER) 73 74 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 75 #define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER) 76 77 #define STACK_WARN (THREAD_SIZE/8) 78 79 #ifndef __ASSEMBLY__ 80 81 void arch_release_thread_stack(unsigned long *stack); 82 83 /* How to get the thread information struct from C. */ 84 register unsigned long stack_pointer __asm__("sp"); 85 86 #define current_thread_info() \ 87 ((struct thread_info *)(stack_pointer & -THREAD_SIZE)) 88 89 /* Sit on a nap instruction until interrupted. */ 90 extern void smp_nap(void); 91 92 /* Enable interrupts racelessly and nap forever: helper for arch_cpu_idle(). */ 93 extern void _cpu_idle(void); 94 95 #else /* __ASSEMBLY__ */ 96 97 /* 98 * How to get the thread information struct from assembly. 99 * Note that we use different macros since different architectures 100 * have different semantics in their "mm" instruction and we would 101 * like to guarantee that the macro expands to exactly one instruction. 102 */ 103 #ifdef __tilegx__ 104 #define EXTRACT_THREAD_INFO(reg) 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 /* 112 * Thread information flags that various assembly files may need to access. 113 * Keep flags accessed frequently in low bits, particular since it makes 114 * it easier to build constants in assembly. 115 */ 116 #define TIF_SIGPENDING 0 /* signal pending */ 117 #define TIF_NEED_RESCHED 1 /* rescheduling necessary */ 118 #define TIF_SINGLESTEP 2 /* restore singlestep on return to 119 user mode */ 120 #define TIF_ASYNC_TLB 3 /* got an async TLB fault in kernel */ 121 #define TIF_SYSCALL_TRACE 4 /* syscall trace active */ 122 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 123 #define TIF_SECCOMP 6 /* secure computing */ 124 #define TIF_MEMDIE 7 /* OOM killer at work */ 125 #define TIF_NOTIFY_RESUME 8 /* callback before returning to user */ 126 #define TIF_SYSCALL_TRACEPOINT 9 /* syscall tracepoint instrumentation */ 127 #define TIF_POLLING_NRFLAG 10 /* idle is polling for TIF_NEED_RESCHED */ 128 #define TIF_NOHZ 11 /* in adaptive nohz mode */ 129 130 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 131 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 132 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 133 #define _TIF_ASYNC_TLB (1<<TIF_ASYNC_TLB) 134 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 135 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 136 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 137 #define _TIF_MEMDIE (1<<TIF_MEMDIE) 138 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 139 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 140 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 141 #define _TIF_NOHZ (1<<TIF_NOHZ) 142 143 /* Work to do as we loop to exit to user space. */ 144 #define _TIF_WORK_MASK \ 145 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 146 _TIF_ASYNC_TLB | _TIF_NOTIFY_RESUME) 147 148 /* Work to do on any return to user space. */ 149 #define _TIF_ALLWORK_MASK \ 150 (_TIF_WORK_MASK | _TIF_SINGLESTEP | _TIF_NOHZ) 151 152 /* Work to do at syscall entry. */ 153 #define _TIF_SYSCALL_ENTRY_WORK \ 154 (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_NOHZ) 155 156 /* Work to do at syscall exit. */ 157 #define _TIF_SYSCALL_EXIT_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT) 158 159 /* 160 * Thread-synchronous status. 161 * 162 * This is different from the flags in that nobody else 163 * ever touches our thread-synchronous status, so we don't 164 * have to worry about atomic accesses. 165 */ 166 #ifdef __tilegx__ 167 #define TS_COMPAT 0x0001 /* 32-bit compatibility mode */ 168 #endif 169 170 #endif /* _ASM_TILE_THREAD_INFO_H */ 171