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Diffstat (limited to 'include/asm-mips/thread_info.h')
| -rw-r--r-- | include/asm-mips/thread_info.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/include/asm-mips/thread_info.h b/include/asm-mips/thread_info.h new file mode 100644 index 00000000000..768900305e2 --- /dev/null +++ b/include/asm-mips/thread_info.h @@ -0,0 +1,137 @@ +/* thread_info.h: MIPS low-level thread information + * + * Copyright (C) 2002 David Howells (dhowells@redhat.com) + * - Incorporating suggestions made by Linus Torvalds and Dave Miller + */ + +#ifndef _ASM_THREAD_INFO_H +#define _ASM_THREAD_INFO_H + +#ifdef __KERNEL__ + +#include <linux/config.h> + +#ifndef __ASSEMBLY__ + +#include <asm/processor.h> + +/* + * low level task data that entry.S needs immediate access to + * - this struct should fit entirely inside of one cache line + * - this struct shares the supervisor stack pages + * - if the contents of this structure are changed, the assembly constants + * must also be changed + */ +struct thread_info { + struct task_struct *task; /* main task structure */ + struct exec_domain *exec_domain; /* execution domain */ + unsigned long flags; /* low level flags */ + __u32 cpu; /* current CPU */ + __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ + + mm_segment_t addr_limit; /* thread address space: + 0-0xBFFFFFFF for user-thead + 0-0xFFFFFFFF for kernel-thread + */ + struct restart_block restart_block; +}; + +/* + * macros/functions for gaining access to the thread information structure + * + * preempt_count needs to be 1 initially, until the scheduler is functional. + */ +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task = &tsk, \ + .exec_domain = &default_exec_domain, \ + .flags = 0, \ + .cpu = 0, \ + .preempt_count = 1, \ + .addr_limit = KERNEL_DS, \ + .restart_block = { \ + .fn = do_no_restart_syscall, \ + }, \ +} + +#define init_thread_info (init_thread_union.thread_info) +#define init_stack (init_thread_union.stack) + +/* How to get the thread information struct from C. */ +register struct thread_info *__current_thread_info __asm__("$28"); +#define current_thread_info() __current_thread_info + +/* thread information allocation */ +#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_MIPS32) +#define THREAD_SIZE_ORDER (1) +#endif +#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_MIPS64) +#define THREAD_SIZE_ORDER (2) +#endif +#ifdef CONFIG_PAGE_SIZE_8KB +#define THREAD_SIZE_ORDER (1) +#endif +#ifdef CONFIG_PAGE_SIZE_16KB +#define THREAD_SIZE_ORDER (0) +#endif +#ifdef CONFIG_PAGE_SIZE_64KB +#define THREAD_SIZE_ORDER (0) +#endif + +#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) +#define THREAD_MASK (THREAD_SIZE - 1UL) + +#ifdef CONFIG_DEBUG_STACK_USAGE +#define alloc_thread_info(tsk) \ +({ \ + struct thread_info *ret; \ + \ + ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \ + if (ret) \ + memset(ret, 0, THREAD_SIZE); \ + ret; \ +}) +#else +#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL) +#endif + +#define free_thread_info(info) kfree(info) +#define get_thread_info(ti) get_task_struct((ti)->task) +#define put_thread_info(ti) put_task_struct((ti)->task) + +#endif /* !__ASSEMBLY__ */ + +#define PREEMPT_ACTIVE 0x10000000 + +/* + * thread information flags + * - these are process state flags that various assembly files may need to + * access + * - pending work-to-be-done flags are in LSW + * - other flags in MSW + */ +#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ +#define TIF_SIGPENDING 2 /* signal pending */ +#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ +#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ +#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ +#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ +#define TIF_MEMDIE 18 +#define TIF_SYSCALL_TRACE 31 /* syscall trace active */ + +#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) +#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) +#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) +#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) +#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) +#define _TIF_USEDFPU (1<<TIF_USEDFPU) +#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) + +#define _TIF_WORK_MASK 0x0000ffef /* work to do on + interrupt/exception return */ +#define _TIF_ALLWORK_MASK 0x8000ffff /* work to do on any return to + u-space */ + +#endif /* __KERNEL__ */ + +#endif /* _ASM_THREAD_INFO_H */ |