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Diffstat (limited to 'arch/tile/include/asm/thread_info.h')
| -rw-r--r-- | arch/tile/include/asm/thread_info.h | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/tile/include/asm/thread_info.h b/arch/tile/include/asm/thread_info.h new file mode 100644 index 00000000000..3872f2b345d --- /dev/null +++ b/arch/tile/include/asm/thread_info.h @@ -0,0 +1,166 @@ +/* + * Copyright (C) 2002 David Howells (dhowells@redhat.com) + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#ifndef _ASM_TILE_THREAD_INFO_H +#define _ASM_TILE_THREAD_INFO_H + +#include <asm/processor.h> +#include <asm/page.h> +#ifndef __ASSEMBLY__ + +/* + * Low level task data that assembly code needs immediate access to. + * The structure is placed at the bottom of the supervisor stack. + */ +struct thread_info { + struct task_struct *task; /* main task structure */ + struct exec_domain *exec_domain; /* execution domain */ + unsigned long flags; /* low level flags */ + unsigned long status; /* thread-synchronous flags */ + __u32 homecache_cpu; /* CPU we are homecached on */ + __u32 cpu; /* current CPU */ + int preempt_count; /* 0 => preemptable, + <0 => BUG */ + + mm_segment_t addr_limit; /* thread address space + (KERNEL_DS or USER_DS) */ + struct restart_block restart_block; + struct single_step_state *step_state; /* single step state + (if non-zero) */ +}; + +/* + * macros/functions for gaining access to the thread information structure. + */ +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task = &tsk, \ + .exec_domain = &default_exec_domain, \ + .flags = 0, \ + .cpu = 0, \ + .preempt_count = INIT_PREEMPT_COUNT, \ + .addr_limit = KERNEL_DS, \ + .restart_block = { \ + .fn = do_no_restart_syscall, \ + }, \ + .step_state = NULL, \ +} + +#define init_thread_info (init_thread_union.thread_info) +#define init_stack (init_thread_union.stack) + +#endif /* !__ASSEMBLY__ */ + +#if PAGE_SIZE < 8192 +#define THREAD_SIZE_ORDER (13 - PAGE_SHIFT) +#else +#define THREAD_SIZE_ORDER (0) +#endif + +#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) +#define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER) + +#define STACK_WARN (THREAD_SIZE/8) + +#ifndef __ASSEMBLY__ + +/* How to get the thread information struct from C. */ +register unsigned long stack_pointer __asm__("sp"); + +#define current_thread_info() \ + ((struct thread_info *)(stack_pointer & -THREAD_SIZE)) + +#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR +extern struct thread_info *alloc_thread_info(struct task_struct *task); +extern void free_thread_info(struct thread_info *info); + +/* Sit on a nap instruction until interrupted. */ +extern void smp_nap(void); + +/* Enable interrupts racelessly and nap forever: helper for cpu_idle(). */ +extern void _cpu_idle(void); + +/* Switch boot idle thread to a freshly-allocated stack and free old stack. */ +extern void cpu_idle_on_new_stack(struct thread_info *old_ti, + unsigned long new_sp, + unsigned long new_ss10); + +#else /* __ASSEMBLY__ */ + +/* how to get the thread information struct from ASM */ +#ifdef __tilegx__ +#define GET_THREAD_INFO(reg) move reg, sp; mm reg, zero, LOG2_THREAD_SIZE, 63 +#else +#define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31 +#endif + +#endif /* !__ASSEMBLY__ */ + +#define PREEMPT_ACTIVE 0x10000000 + +/* + * Thread information flags that various assembly files may need to access. + * Keep flags accessed frequently in low bits, particular since it makes + * it easier to build constants in assembly. + */ +#define TIF_SIGPENDING 0 /* signal pending */ +#define TIF_NEED_RESCHED 1 /* rescheduling necessary */ +#define TIF_SINGLESTEP 2 /* restore singlestep on return to + user mode */ +#define TIF_ASYNC_TLB 3 /* got an async TLB fault in kernel */ +#define TIF_SYSCALL_TRACE 4 /* syscall trace active */ +#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ +#define TIF_SECCOMP 6 /* secure computing */ +#define TIF_MEMDIE 7 /* OOM killer at work */ + +#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) +#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) +#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) +#define _TIF_ASYNC_TLB (1<<TIF_ASYNC_TLB) +#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) +#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) +#define _TIF_SECCOMP (1<<TIF_SECCOMP) +#define _TIF_MEMDIE (1<<TIF_MEMDIE) + +/* Work to do on any return to user space. */ +#define _TIF_ALLWORK_MASK \ + (_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SINGLESTEP|_TIF_ASYNC_TLB) + +/* + * Thread-synchronous status. + * + * This is different from the flags in that nobody else + * ever touches our thread-synchronous status, so we don't + * have to worry about atomic accesses. + */ +#ifdef __tilegx__ +#define TS_COMPAT 0x0001 /* 32-bit compatibility mode */ +#endif +#define TS_POLLING 0x0004 /* in idle loop but not sleeping */ +#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal */ + +#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING) + +#ifndef __ASSEMBLY__ +#define HAVE_SET_RESTORE_SIGMASK 1 +static inline void set_restore_sigmask(void) +{ + struct thread_info *ti = current_thread_info(); + ti->status |= TS_RESTORE_SIGMASK; + set_bit(TIF_SIGPENDING, &ti->flags); +} +#endif /* !__ASSEMBLY__ */ + +#endif /* _ASM_TILE_THREAD_INFO_H */ |