David Gibson | 6cb7bfe | 2005-10-21 15:45:50 +1000 | [diff] [blame] | 1 | /* thread_info.h: PowerPC low-level thread information |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * adapted from the i386 version by Paul Mackerras |
| 3 | * |
| 4 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) |
| 5 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller |
| 6 | */ |
| 7 | |
David Gibson | 6cb7bfe | 2005-10-21 15:45:50 +1000 | [diff] [blame] | 8 | #ifndef _ASM_POWERPC_THREAD_INFO_H |
| 9 | #define _ASM_POWERPC_THREAD_INFO_H |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | |
| 11 | #ifdef __KERNEL__ |
| 12 | |
David Gibson | 6cb7bfe | 2005-10-21 15:45:50 +1000 | [diff] [blame] | 13 | /* We have 8k stacks on ppc32 and 16k on ppc64 */ |
| 14 | |
| 15 | #ifdef CONFIG_PPC64 |
| 16 | #define THREAD_SHIFT 14 |
| 17 | #else |
| 18 | #define THREAD_SHIFT 13 |
| 19 | #endif |
| 20 | |
| 21 | #define THREAD_SIZE (1 << THREAD_SHIFT) |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #ifndef __ASSEMBLY__ |
| 24 | #include <linux/config.h> |
| 25 | #include <linux/cache.h> |
| 26 | #include <asm/processor.h> |
| 27 | #include <asm/page.h> |
| 28 | #include <linux/stringify.h> |
| 29 | |
| 30 | /* |
| 31 | * low level task data. |
| 32 | */ |
| 33 | struct thread_info { |
| 34 | struct task_struct *task; /* main task structure */ |
| 35 | struct exec_domain *exec_domain; /* execution domain */ |
| 36 | int cpu; /* cpu we're on */ |
David Gibson | 6cb7bfe | 2005-10-21 15:45:50 +1000 | [diff] [blame] | 37 | int preempt_count; /* 0 => preemptable, |
| 38 | <0 => BUG */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | struct restart_block restart_block; |
| 40 | /* set by force_successful_syscall_return */ |
| 41 | unsigned char syscall_noerror; |
| 42 | /* low level flags - has atomic operations done on it */ |
| 43 | unsigned long flags ____cacheline_aligned_in_smp; |
| 44 | }; |
| 45 | |
| 46 | /* |
| 47 | * macros/functions for gaining access to the thread information structure |
| 48 | * |
| 49 | * preempt_count needs to be 1 initially, until the scheduler is functional. |
| 50 | */ |
| 51 | #define INIT_THREAD_INFO(tsk) \ |
| 52 | { \ |
| 53 | .task = &tsk, \ |
| 54 | .exec_domain = &default_exec_domain, \ |
| 55 | .cpu = 0, \ |
| 56 | .preempt_count = 1, \ |
| 57 | .restart_block = { \ |
| 58 | .fn = do_no_restart_syscall, \ |
| 59 | }, \ |
| 60 | .flags = 0, \ |
| 61 | } |
| 62 | |
| 63 | #define init_thread_info (init_thread_union.thread_info) |
| 64 | #define init_stack (init_thread_union.stack) |
| 65 | |
| 66 | /* thread information allocation */ |
| 67 | |
David Gibson | 328985b | 2005-10-24 14:05:38 +1000 | [diff] [blame] | 68 | #if THREAD_SHIFT >= PAGE_SHIFT |
| 69 | |
| 70 | #define THREAD_ORDER (THREAD_SHIFT - PAGE_SHIFT) |
| 71 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 72 | #ifdef CONFIG_DEBUG_STACK_USAGE |
David Gibson | 328985b | 2005-10-24 14:05:38 +1000 | [diff] [blame] | 73 | #define alloc_thread_info(tsk) \ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 74 | ((struct thread_info *)__get_free_pages(GFP_KERNEL | \ |
| 75 | __GFP_ZERO, THREAD_ORDER)) |
| 76 | #else |
| 77 | #define alloc_thread_info(tsk) \ |
| 78 | ((struct thread_info *)__get_free_pages(GFP_KERNEL, THREAD_ORDER)) |
| 79 | #endif |
David Gibson | 328985b | 2005-10-24 14:05:38 +1000 | [diff] [blame] | 80 | #define free_thread_info(ti) free_pages((unsigned long)ti, THREAD_ORDER) |
| 81 | |
| 82 | #else /* THREAD_SHIFT < PAGE_SHIFT */ |
| 83 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 84 | #ifdef CONFIG_DEBUG_STACK_USAGE |
| 85 | #define alloc_thread_info(tsk) kzalloc(THREAD_SIZE, GFP_KERNEL) |
| 86 | #else |
| 87 | #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) |
| 88 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | #define free_thread_info(ti) kfree(ti) |
David Gibson | 328985b | 2005-10-24 14:05:38 +1000 | [diff] [blame] | 90 | |
| 91 | #endif /* THREAD_SHIFT < PAGE_SHIFT */ |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | #define get_thread_info(ti) get_task_struct((ti)->task) |
| 94 | #define put_thread_info(ti) put_task_struct((ti)->task) |
| 95 | |
| 96 | /* how to get the thread information struct from C */ |
| 97 | static inline struct thread_info *current_thread_info(void) |
| 98 | { |
David Gibson | 6cb7bfe | 2005-10-21 15:45:50 +1000 | [diff] [blame] | 99 | register unsigned long sp asm("r1"); |
| 100 | |
| 101 | /* gcc4, at least, is smart enough to turn this into a single |
| 102 | * rlwinm for ppc32 and clrrdi for ppc64 */ |
| 103 | return (struct thread_info *)(sp & ~(THREAD_SIZE-1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | #endif /* __ASSEMBLY__ */ |
| 107 | |
| 108 | #define PREEMPT_ACTIVE 0x10000000 |
| 109 | |
| 110 | /* |
| 111 | * thread information flag bit numbers |
| 112 | */ |
| 113 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ |
| 114 | #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ |
| 115 | #define TIF_SIGPENDING 2 /* signal pending */ |
| 116 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ |
| 117 | #define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling |
| 118 | TIF_NEED_RESCHED */ |
| 119 | #define TIF_32BIT 5 /* 32 bit binary */ |
Anton Blanchard | 6dc2f0c | 2005-06-02 14:02:02 -0700 | [diff] [blame] | 120 | /* #define SPARE 6 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | #define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */ |
| 122 | #define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */ |
| 123 | #define TIF_SINGLESTEP 9 /* singlestepping active */ |
| 124 | #define TIF_MEMDIE 10 |
| 125 | #define TIF_SECCOMP 11 /* secure computing */ |
| 126 | |
| 127 | /* as above, but as bit values */ |
| 128 | #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) |
| 129 | #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| 130 | #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) |
| 131 | #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) |
| 132 | #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) |
| 133 | #define _TIF_32BIT (1<<TIF_32BIT) |
Anton Blanchard | 6dc2f0c | 2005-06-02 14:02:02 -0700 | [diff] [blame] | 134 | /* #define _SPARE (1<<SPARE) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) |
| 136 | #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
| 137 | #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) |
| 138 | #define _TIF_SECCOMP (1<<TIF_SECCOMP) |
| 139 | #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP) |
| 140 | |
| 141 | #define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \ |
| 142 | _TIF_NEED_RESCHED) |
| 143 | |
| 144 | #endif /* __KERNEL__ */ |
| 145 | |
David Gibson | 6cb7bfe | 2005-10-21 15:45:50 +1000 | [diff] [blame] | 146 | #endif /* _ASM_POWERPC_THREAD_INFO_H */ |