1 /* 2 * Thread support for the Hexagon architecture 3 * 4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 and 8 * only version 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 18 * 02110-1301, USA. 19 */ 20 21 #ifndef _ASM_THREAD_INFO_H 22 #define _ASM_THREAD_INFO_H 23 24 #ifdef __KERNEL__ 25 26 #ifndef __ASSEMBLY__ 27 #include <asm/processor.h> 28 #include <asm/registers.h> 29 #include <asm/page.h> 30 #endif 31 32 #define THREAD_SHIFT 12 33 #define THREAD_SIZE (1<<THREAD_SHIFT) 34 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 35 36 #ifndef __ASSEMBLY__ 37 38 typedef struct { 39 unsigned long seg; 40 } mm_segment_t; 41 42 /* 43 * This is union'd with the "bottom" of the kernel stack. 44 * It keeps track of thread info which is handy for routines 45 * to access quickly. 46 */ 47 48 struct thread_info { 49 struct task_struct *task; /* main task structure */ 50 struct exec_domain *exec_domain; /* execution domain */ 51 unsigned long flags; /* low level flags */ 52 __u32 cpu; /* current cpu */ 53 int preempt_count; /* 0=>preemptible,<0=>BUG */ 54 mm_segment_t addr_limit; /* segmentation sux */ 55 /* 56 * used for syscalls somehow; 57 * seems to have a function pointer and four arguments 58 */ 59 struct restart_block restart_block; 60 /* Points to the current pt_regs frame */ 61 struct pt_regs *regs; 62 /* 63 * saved kernel sp at switch_to time; 64 * not sure if this is used (it's not in the VM model it seems; 65 * see thread_struct) 66 */ 67 unsigned long sp; 68 }; 69 70 #else /* !__ASSEMBLY__ */ 71 72 #include <asm/asm-offsets.h> 73 74 #endif /* __ASSEMBLY__ */ 75 76 /* looks like "linux/hardirq.h" uses this. */ 77 78 #define PREEMPT_ACTIVE 0x10000000 79 80 #ifndef __ASSEMBLY__ 81 82 #define INIT_THREAD_INFO(tsk) \ 83 { \ 84 .task = &tsk, \ 85 .exec_domain = &default_exec_domain, \ 86 .flags = 0, \ 87 .cpu = 0, \ 88 .preempt_count = 1, \ 89 .addr_limit = KERNEL_DS, \ 90 .restart_block = { \ 91 .fn = do_no_restart_syscall, \ 92 }, \ 93 .sp = 0, \ 94 .regs = NULL, \ 95 } 96 97 #define init_thread_info (init_thread_union.thread_info) 98 #define init_stack (init_thread_union.stack) 99 100 /* Tacky preprocessor trickery */ 101 #define qqstr(s) qstr(s) 102 #define qstr(s) #s 103 #define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG) 104 105 register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG); 106 #define current_thread_info() __current_thread_info 107 108 #endif /* __ASSEMBLY__ */ 109 110 /* 111 * thread information flags 112 * - these are process state flags that various assembly files 113 * may need to access 114 * - pending work-to-be-done flags are in LSW 115 * - other flags in MSW 116 */ 117 118 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 119 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 120 #define TIF_SIGPENDING 2 /* signal pending */ 121 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 122 #define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */ 123 #define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */ 124 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 125 #define TIF_MEMDIE 17 /* OOM killer killed process */ 126 127 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 128 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 129 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 130 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 131 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 132 133 /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */ 134 #define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE) 135 136 /* work to do on any return to u-space */ 137 #define _TIF_ALLWORK_MASK 0x0000FFFF 138 139 #endif /* __KERNEL__ */ 140 141 #endif 142