1 /* thread_info.h: PowerPC low-level thread information 2 * adapted from the i386 version by Paul Mackerras 3 * 4 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 6 */ 7 8 #ifndef _ASM_POWERPC_THREAD_INFO_H 9 #define _ASM_POWERPC_THREAD_INFO_H 10 11 #ifdef __KERNEL__ 12 13 /* We have 8k stacks on ppc32 and 16k on ppc64 */ 14 15 #if defined(CONFIG_PPC64) 16 #define THREAD_SHIFT 14 17 #elif defined(CONFIG_PPC_256K_PAGES) 18 #define THREAD_SHIFT 15 19 #else 20 #define THREAD_SHIFT 13 21 #endif 22 23 #define THREAD_SIZE (1 << THREAD_SHIFT) 24 25 #ifdef CONFIG_PPC64 26 #define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(clrrdi dest, sp, THREAD_SHIFT) 27 #else 28 #define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT) 29 #endif 30 31 #ifndef __ASSEMBLY__ 32 #include <linux/cache.h> 33 #include <asm/processor.h> 34 #include <asm/page.h> 35 #include <linux/stringify.h> 36 #include <asm/accounting.h> 37 38 /* 39 * low level task data. 40 */ 41 struct thread_info { 42 struct task_struct *task; /* main task structure */ 43 int cpu; /* cpu we're on */ 44 int preempt_count; /* 0 => preemptable, 45 <0 => BUG */ 46 unsigned long local_flags; /* private flags for thread */ 47 #ifdef CONFIG_LIVEPATCH 48 unsigned long *livepatch_sp; 49 #endif 50 #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32) 51 struct cpu_accounting_data accounting; 52 #endif 53 /* low level flags - has atomic operations done on it */ 54 unsigned long flags ____cacheline_aligned_in_smp; 55 }; 56 57 /* 58 * macros/functions for gaining access to the thread information structure 59 */ 60 #define INIT_THREAD_INFO(tsk) \ 61 { \ 62 .task = &tsk, \ 63 .cpu = 0, \ 64 .preempt_count = INIT_PREEMPT_COUNT, \ 65 .flags = 0, \ 66 } 67 68 #define init_thread_info (init_thread_union.thread_info) 69 #define init_stack (init_thread_union.stack) 70 71 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 72 73 /* how to get the thread information struct from C */ 74 static inline struct thread_info *current_thread_info(void) 75 { 76 unsigned long val; 77 78 asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val)); 79 80 return (struct thread_info *)val; 81 } 82 83 #endif /* __ASSEMBLY__ */ 84 85 /* 86 * thread information flag bit numbers 87 */ 88 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 89 #define TIF_SIGPENDING 1 /* signal pending */ 90 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 91 #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 92 TIF_NEED_RESCHED */ 93 #define TIF_32BIT 4 /* 32 bit binary */ 94 #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ 95 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 96 #define TIF_SINGLESTEP 8 /* singlestepping active */ 97 #define TIF_NOHZ 9 /* in adaptive nohz mode */ 98 #define TIF_SECCOMP 10 /* secure computing */ 99 #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ 100 #define TIF_NOERROR 12 /* Force successful syscall return */ 101 #define TIF_NOTIFY_RESUME 13 /* callback before returning to user */ 102 #define TIF_UPROBE 14 /* breakpointed or single-stepping */ 103 #define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */ 104 #define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation 105 for stack store? */ 106 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 107 #if defined(CONFIG_PPC64) 108 #define TIF_ELF2ABI 18 /* function descriptors must die! */ 109 #endif 110 111 /* as above, but as bit values */ 112 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 113 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 114 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 115 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 116 #define _TIF_32BIT (1<<TIF_32BIT) 117 #define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM) 118 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 119 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 120 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 121 #define _TIF_RESTOREALL (1<<TIF_RESTOREALL) 122 #define _TIF_NOERROR (1<<TIF_NOERROR) 123 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 124 #define _TIF_UPROBE (1<<TIF_UPROBE) 125 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 126 #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) 127 #define _TIF_NOHZ (1<<TIF_NOHZ) 128 #define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ 129 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ 130 _TIF_NOHZ) 131 132 #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ 133 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ 134 _TIF_RESTORE_TM) 135 #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) 136 137 /* Bits in local_flags */ 138 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ 139 #define TLF_NAPPING 0 /* idle thread enabled NAP mode */ 140 #define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */ 141 #define TLF_LAZY_MMU 3 /* tlb_batch is active */ 142 #define TLF_RUNLATCH 4 /* Is the runlatch enabled? */ 143 144 #define _TLF_NAPPING (1 << TLF_NAPPING) 145 #define _TLF_SLEEPING (1 << TLF_SLEEPING) 146 #define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU) 147 #define _TLF_RUNLATCH (1 << TLF_RUNLATCH) 148 149 #ifndef __ASSEMBLY__ 150 151 static inline bool test_thread_local_flags(unsigned int flags) 152 { 153 struct thread_info *ti = current_thread_info(); 154 return (ti->local_flags & flags) != 0; 155 } 156 157 #ifdef CONFIG_PPC64 158 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 159 #else 160 #define is_32bit_task() (1) 161 #endif 162 163 #if defined(CONFIG_PPC64) 164 #define is_elf2_task() (test_thread_flag(TIF_ELF2ABI)) 165 #else 166 #define is_elf2_task() (0) 167 #endif 168 169 #endif /* !__ASSEMBLY__ */ 170 171 #endif /* __KERNEL__ */ 172 173 #endif /* _ASM_POWERPC_THREAD_INFO_H */ 174