| 1 | /* |
| 2 | * Based on arch/arm/include/asm/thread_info.h |
| 3 | * |
| 4 | * Copyright (C) 2002 Russell King. |
| 5 | * Copyright (C) 2012 ARM Ltd. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | #ifndef __ASM_THREAD_INFO_H |
| 20 | #define __ASM_THREAD_INFO_H |
| 21 | |
| 22 | #ifdef __KERNEL__ |
| 23 | |
| 24 | #include <linux/compiler.h> |
| 25 | |
| 26 | #ifndef CONFIG_ARM64_64K_PAGES |
| 27 | #define THREAD_SIZE_ORDER 1 |
| 28 | #endif |
| 29 | |
| 30 | #define THREAD_SIZE 8192 |
| 31 | #define THREAD_START_SP (THREAD_SIZE - 16) |
| 32 | |
| 33 | #ifndef __ASSEMBLY__ |
| 34 | |
| 35 | struct task_struct; |
| 36 | struct exec_domain; |
| 37 | |
| 38 | #include <asm/types.h> |
| 39 | |
| 40 | typedef unsigned long mm_segment_t; |
| 41 | |
| 42 | /* |
| 43 | * low level task data that entry.S needs immediate access to. |
| 44 | * __switch_to() assumes cpu_context follows immediately after cpu_domain. |
| 45 | */ |
| 46 | struct thread_info { |
| 47 | unsigned long flags; /* low level flags */ |
| 48 | mm_segment_t addr_limit; /* address limit */ |
| 49 | struct task_struct *task; /* main task structure */ |
| 50 | struct exec_domain *exec_domain; /* execution domain */ |
| 51 | struct restart_block restart_block; |
| 52 | int preempt_count; /* 0 => preemptable, <0 => bug */ |
| 53 | int cpu; /* cpu */ |
| 54 | }; |
| 55 | |
| 56 | #define INIT_THREAD_INFO(tsk) \ |
| 57 | { \ |
| 58 | .task = &tsk, \ |
| 59 | .exec_domain = &default_exec_domain, \ |
| 60 | .flags = 0, \ |
| 61 | .preempt_count = INIT_PREEMPT_COUNT, \ |
| 62 | .addr_limit = KERNEL_DS, \ |
| 63 | .restart_block = { \ |
| 64 | .fn = do_no_restart_syscall, \ |
| 65 | }, \ |
| 66 | } |
| 67 | |
| 68 | #define init_thread_info (init_thread_union.thread_info) |
| 69 | #define init_stack (init_thread_union.stack) |
| 70 | |
| 71 | /* |
| 72 | * how to get the thread information struct from C |
| 73 | */ |
| 74 | static inline struct thread_info *current_thread_info(void) __attribute_const__; |
| 75 | |
| 76 | static inline struct thread_info *current_thread_info(void) |
| 77 | { |
| 78 | register unsigned long sp asm ("sp"); |
| 79 | return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); |
| 80 | } |
| 81 | |
| 82 | #define thread_saved_pc(tsk) \ |
| 83 | ((unsigned long)(tsk->thread.cpu_context.pc)) |
| 84 | #define thread_saved_sp(tsk) \ |
| 85 | ((unsigned long)(tsk->thread.cpu_context.sp)) |
| 86 | #define thread_saved_fp(tsk) \ |
| 87 | ((unsigned long)(tsk->thread.cpu_context.fp)) |
| 88 | |
| 89 | #endif |
| 90 | |
| 91 | /* |
| 92 | * We use bit 30 of the preempt_count to indicate that kernel |
| 93 | * preemption is occurring. See <asm/hardirq.h>. |
| 94 | */ |
| 95 | #define PREEMPT_ACTIVE 0x40000000 |
| 96 | |
| 97 | /* |
| 98 | * thread information flags: |
| 99 | * TIF_SYSCALL_TRACE - syscall trace active |
| 100 | * TIF_SIGPENDING - signal pending |
| 101 | * TIF_NEED_RESCHED - rescheduling necessary |
| 102 | * TIF_NOTIFY_RESUME - callback before returning to user |
| 103 | * TIF_USEDFPU - FPU was used by this task this quantum (SMP) |
| 104 | * TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED |
| 105 | */ |
| 106 | #define TIF_SIGPENDING 0 |
| 107 | #define TIF_NEED_RESCHED 1 |
| 108 | #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ |
| 109 | #define TIF_SYSCALL_TRACE 8 |
| 110 | #define TIF_POLLING_NRFLAG 16 |
| 111 | #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ |
| 112 | #define TIF_FREEZE 19 |
| 113 | #define TIF_RESTORE_SIGMASK 20 |
| 114 | #define TIF_SINGLESTEP 21 |
| 115 | #define TIF_32BIT 22 /* 32bit process */ |
| 116 | #define TIF_SWITCH_MM 23 /* deferred switch_mm */ |
| 117 | |
| 118 | #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) |
| 119 | #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) |
| 120 | #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) |
| 121 | #define _TIF_32BIT (1 << TIF_32BIT) |
| 122 | |
| 123 | #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ |
| 124 | _TIF_NOTIFY_RESUME) |
| 125 | |
| 126 | #endif /* __KERNEL__ */ |
| 127 | #endif /* __ASM_THREAD_INFO_H */ |