Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * include/asm-xtensa/thread_info.h |
| 3 | * |
| 4 | * This file is subject to the terms and conditions of the GNU General Public |
| 5 | * License. See the file "COPYING" in the main directory of this archive |
| 6 | * for more details. |
| 7 | * |
| 8 | * Copyright (C) 2001 - 2005 Tensilica Inc. |
| 9 | */ |
| 10 | |
| 11 | #ifndef _XTENSA_THREAD_INFO_H |
| 12 | #define _XTENSA_THREAD_INFO_H |
| 13 | |
| 14 | #ifdef __KERNEL__ |
| 15 | |
| 16 | #ifndef __ASSEMBLY__ |
| 17 | # include <asm/processor.h> |
| 18 | #endif |
| 19 | |
| 20 | /* |
| 21 | * low level task data that entry.S needs immediate access to |
| 22 | * - this struct should fit entirely inside of one cache line |
| 23 | * - this struct shares the supervisor stack pages |
| 24 | * - if the contents of this structure are changed, the assembly constants |
| 25 | * must also be changed |
| 26 | */ |
| 27 | |
| 28 | #ifndef __ASSEMBLY__ |
| 29 | |
Chris Zankel | c658eac | 2008-02-12 13:17:07 -0800 | [diff] [blame] | 30 | #if XTENSA_HAVE_COPROCESSORS |
| 31 | |
| 32 | typedef struct xtregs_coprocessor { |
| 33 | xtregs_cp0_t cp0; |
| 34 | xtregs_cp1_t cp1; |
| 35 | xtregs_cp2_t cp2; |
| 36 | xtregs_cp3_t cp3; |
| 37 | xtregs_cp4_t cp4; |
| 38 | xtregs_cp5_t cp5; |
| 39 | xtregs_cp6_t cp6; |
| 40 | xtregs_cp7_t cp7; |
| 41 | } xtregs_coprocessor_t; |
| 42 | |
| 43 | #endif |
| 44 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 45 | struct thread_info { |
| 46 | struct task_struct *task; /* main task structure */ |
| 47 | struct exec_domain *exec_domain; /* execution domain */ |
| 48 | unsigned long flags; /* low level flags */ |
| 49 | unsigned long status; /* thread-synchronous flags */ |
| 50 | __u32 cpu; /* current CPU */ |
| 51 | __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ |
| 52 | |
| 53 | mm_segment_t addr_limit; /* thread address space */ |
| 54 | struct restart_block restart_block; |
| 55 | |
Chris Zankel | c658eac | 2008-02-12 13:17:07 -0800 | [diff] [blame] | 56 | unsigned long cpenable; |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 57 | |
Chris Zankel | c658eac | 2008-02-12 13:17:07 -0800 | [diff] [blame] | 58 | /* Allocate storage for extra user states and coprocessor states. */ |
| 59 | #if XTENSA_HAVE_COPROCESSORS |
| 60 | xtregs_coprocessor_t xtregs_cp; |
| 61 | #endif |
| 62 | xtregs_user_t xtregs_user; |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 63 | }; |
| 64 | |
| 65 | #else /* !__ASSEMBLY__ */ |
| 66 | |
| 67 | /* offsets into the thread_info struct for assembly code access */ |
| 68 | #define TI_TASK 0x00000000 |
| 69 | #define TI_EXEC_DOMAIN 0x00000004 |
| 70 | #define TI_FLAGS 0x00000008 |
| 71 | #define TI_STATUS 0x0000000C |
| 72 | #define TI_CPU 0x00000010 |
| 73 | #define TI_PRE_COUNT 0x00000014 |
| 74 | #define TI_ADDR_LIMIT 0x00000018 |
| 75 | #define TI_RESTART_BLOCK 0x000001C |
| 76 | |
| 77 | #endif |
| 78 | |
| 79 | #define PREEMPT_ACTIVE 0x10000000 |
| 80 | |
| 81 | /* |
| 82 | * macros/functions for gaining access to the thread information structure |
| 83 | * |
| 84 | * preempt_count needs to be 1 initially, until the scheduler is functional. |
| 85 | */ |
| 86 | |
| 87 | #ifndef __ASSEMBLY__ |
| 88 | |
| 89 | #define INIT_THREAD_INFO(tsk) \ |
| 90 | { \ |
| 91 | .task = &tsk, \ |
| 92 | .exec_domain = &default_exec_domain, \ |
| 93 | .flags = 0, \ |
| 94 | .cpu = 0, \ |
| 95 | .preempt_count = 1, \ |
| 96 | .addr_limit = KERNEL_DS, \ |
| 97 | .restart_block = { \ |
| 98 | .fn = do_no_restart_syscall, \ |
| 99 | }, \ |
| 100 | } |
| 101 | |
| 102 | #define init_thread_info (init_thread_union.thread_info) |
| 103 | #define init_stack (init_thread_union.stack) |
| 104 | |
| 105 | /* how to get the thread information struct from C */ |
| 106 | static inline struct thread_info *current_thread_info(void) |
| 107 | { |
| 108 | struct thread_info *ti; |
| 109 | __asm__("extui %0,a1,0,13\n\t" |
| 110 | "xor %0, a1, %0" : "=&r" (ti) : ); |
| 111 | return ti; |
| 112 | } |
| 113 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 114 | #else /* !__ASSEMBLY__ */ |
| 115 | |
| 116 | /* how to get the thread information struct from ASM */ |
| 117 | #define GET_THREAD_INFO(reg,sp) \ |
| 118 | extui reg, sp, 0, 13; \ |
| 119 | xor reg, sp, reg |
| 120 | #endif |
| 121 | |
| 122 | |
| 123 | /* |
| 124 | * thread information flags |
| 125 | * - these are process state flags that various assembly files may need to access |
| 126 | * - pending work-to-be-done flags are in LSW |
| 127 | * - other flags in MSW |
| 128 | */ |
| 129 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ |
Stephane Eranian | a583f1b | 2007-07-31 00:38:00 -0700 | [diff] [blame] | 130 | #define TIF_SIGPENDING 1 /* signal pending */ |
| 131 | #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ |
| 132 | #define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */ |
| 133 | #define TIF_IRET 4 /* return with iret */ |
| 134 | #define TIF_MEMDIE 5 |
| 135 | #define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 136 | #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ |
Matt Helsley | 83224b0 | 2008-10-18 20:27:18 -0700 | [diff] [blame] | 137 | #define TIF_FREEZE 17 /* is freezing for suspend */ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 138 | |
| 139 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 140 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
| 141 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
| 142 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) |
| 143 | #define _TIF_IRET (1<<TIF_IRET) |
| 144 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) |
Chris Zankel | de4f6e5 | 2007-05-31 17:47:01 -0700 | [diff] [blame] | 145 | #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) |
Matt Helsley | 83224b0 | 2008-10-18 20:27:18 -0700 | [diff] [blame] | 146 | #define _TIF_FREEZE (1<<TIF_FREEZE) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 147 | |
| 148 | #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ |
| 149 | #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ |
| 150 | |
| 151 | /* |
| 152 | * Thread-synchronous status. |
| 153 | * |
| 154 | * This is different from the flags in that nobody else |
| 155 | * ever touches our thread-synchronous status, so we don't |
| 156 | * have to worry about atomic accesses. |
| 157 | */ |
| 158 | #define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */ |
| 159 | |
| 160 | #define THREAD_SIZE 8192 //(2*PAGE_SIZE) |
FUJITA Tomonori | b69c49b | 2008-07-25 01:45:40 -0700 | [diff] [blame] | 161 | #define THREAD_SIZE_ORDER 1 |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 162 | |
| 163 | #endif /* __KERNEL__ */ |
| 164 | #endif /* _XTENSA_THREAD_INFO */ |