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 typedef struct { 26 unsigned long seg; 27 } mm_segment_t; 28 29 /* 30 * This is union'd with the "bottom" of the kernel stack. 31 * It keeps track of thread info which is handy for routines 32 * to access quickly. 33 */ 34 35 struct thread_info { 36 struct task_struct *task; /* main task structure */ 37 unsigned long flags; /* low level flags */ 38 __u32 cpu; /* current cpu */ 39 int preempt_count; /* 0=>preemptible,<0=>BUG */ 40 mm_segment_t addr_limit; /* segmentation sux */ 41 /* 42 * used for syscalls somehow; 43 * seems to have a function pointer and four arguments 44 */ 45 /* Points to the current pt_regs frame */ 46 struct pt_regs *regs; 47 /* 48 * saved kernel sp at switch_to time; 49 * not sure if this is used (it's not in the VM model it seems; 50 * see thread_struct) 51 */ 52 unsigned long sp; 53 }; 54 55 #else /* !__ASSEMBLY__ */ 56 57 #include <asm/asm-offsets.h> 58 59 #endif /* __ASSEMBLY__ */ 60 61 #ifndef __ASSEMBLY__ 62 63 #define INIT_THREAD_INFO(tsk) \ 64 { \ 65 .task = &tsk, \ 66 .flags = 0, \ 67 .cpu = 0, \ 68 .preempt_count = 1, \ 69 .addr_limit = KERNEL_DS, \ 70 .sp = 0, \ 71 .regs = NULL, \ 72 } 73 74 /* Tacky preprocessor trickery */ 75 #define qqstr(s) qstr(s) 76 #define qstr(s) #s 77 #define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG) 78 79 register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG); 80 #define current_thread_info() __current_thread_info 81 82 #endif /* __ASSEMBLY__ */ 83 84 /* 85 * thread information flags 86 * - these are process state flags that various assembly files 87 * may need to access 88 * - pending work-to-be-done flags are in LSW 89 * - other flags in MSW 90 */ 91 92 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 93 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 94 #define TIF_SIGPENDING 2 /* signal pending */ 95 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 96 #define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */ 97 #define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */ 98 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 99 #define TIF_MEMDIE 17 /* OOM killer killed process */ 100 101 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 102 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 103 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 104 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 105 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 106 107 /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */ 108 #define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE) 109 110 /* work to do on any return to u-space */ 111 #define _TIF_ALLWORK_MASK 0x0000FFFF 112 113 #endif /* __KERNEL__ */ 114 115 #endif 116