1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Thread support for the Hexagon architecture 4 * 5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. 6 */ 7 8 #ifndef _ASM_THREAD_INFO_H 9 #define _ASM_THREAD_INFO_H 10 11 #ifdef __KERNEL__ 12 13 #ifndef __ASSEMBLY__ 14 #include <asm/processor.h> 15 #include <asm/registers.h> 16 #include <asm/page.h> 17 #endif 18 19 #define THREAD_SHIFT 12 20 #define THREAD_SIZE (1<<THREAD_SHIFT) 21 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 22 23 #ifndef __ASSEMBLY__ 24 25 /* 26 * This is union'd with the "bottom" of the kernel stack. 27 * It keeps track of thread info which is handy for routines 28 * to access quickly. 29 */ 30 31 struct thread_info { 32 struct task_struct *task; /* main task structure */ 33 unsigned long flags; /* low level flags */ 34 __u32 cpu; /* current cpu */ 35 int preempt_count; /* 0=>preemptible,<0=>BUG */ 36 /* 37 * used for syscalls somehow; 38 * seems to have a function pointer and four arguments 39 */ 40 /* Points to the current pt_regs frame */ 41 struct pt_regs *regs; 42 /* 43 * saved kernel sp at switch_to time; 44 * not sure if this is used (it's not in the VM model it seems; 45 * see thread_struct) 46 */ 47 unsigned long sp; 48 }; 49 50 #else /* !__ASSEMBLY__ */ 51 52 #include <asm/asm-offsets.h> 53 54 #endif /* __ASSEMBLY__ */ 55 56 #ifndef __ASSEMBLY__ 57 58 #define INIT_THREAD_INFO(tsk) \ 59 { \ 60 .task = &tsk, \ 61 .flags = 0, \ 62 .cpu = 0, \ 63 .preempt_count = 1, \ 64 .sp = 0, \ 65 .regs = NULL, \ 66 } 67 68 /* Tacky preprocessor trickery */ 69 #define qqstr(s) qstr(s) 70 #define qstr(s) #s 71 #define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG) 72 73 register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG); 74 #define current_thread_info() __current_thread_info 75 76 #endif /* __ASSEMBLY__ */ 77 78 /* 79 * thread information flags 80 * - these are process state flags that various assembly files 81 * may need to access 82 * - pending work-to-be-done flags are in LSW 83 * - other flags in MSW 84 */ 85 86 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 87 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 88 #define TIF_SIGPENDING 2 /* signal pending */ 89 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 90 #define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */ 91 #define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */ 92 #define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ 93 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 94 #define TIF_MEMDIE 17 /* OOM killer killed process */ 95 96 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 97 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 98 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 99 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 100 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 101 #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) 102 103 /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */ 104 #define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE) 105 106 /* work to do on any return to u-space */ 107 #define _TIF_ALLWORK_MASK 0x0000FFFF 108 109 #endif /* __KERNEL__ */ 110 111 #endif 112