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Diffstat (limited to '')
| -rw-r--r-- | arch/xtensa/include/asm/thread_info.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/thread_info.h b/arch/xtensa/include/asm/thread_info.h new file mode 100644 index 000000000..2bd19ae61 --- /dev/null +++ b/arch/xtensa/include/asm/thread_info.h @@ -0,0 +1,135 @@ +/* + * include/asm-xtensa/thread_info.h + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2001 - 2005 Tensilica Inc. + */ + +#ifndef _XTENSA_THREAD_INFO_H +#define _XTENSA_THREAD_INFO_H + +#include <asm/kmem_layout.h> + +#define CURRENT_SHIFT KERNEL_STACK_SHIFT + +#ifndef __ASSEMBLY__ +# include <asm/processor.h> +#endif + +/* + * 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 + */ + +#ifndef __ASSEMBLY__ + +#if XTENSA_HAVE_COPROCESSORS + +typedef struct xtregs_coprocessor { + xtregs_cp0_t cp0; + xtregs_cp1_t cp1; + xtregs_cp2_t cp2; + xtregs_cp3_t cp3; + xtregs_cp4_t cp4; + xtregs_cp5_t cp5; + xtregs_cp6_t cp6; + xtregs_cp7_t cp7; +} xtregs_coprocessor_t; + +#endif + +struct thread_info { + struct task_struct *task; /* main task structure */ + unsigned long flags; /* low level flags */ + unsigned long status; /* thread-synchronous flags */ + __u32 cpu; /* current CPU */ + __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/ + + mm_segment_t addr_limit; /* thread address space */ + + unsigned long cpenable; + + /* Allocate storage for extra user states and coprocessor states. */ +#if XTENSA_HAVE_COPROCESSORS + xtregs_coprocessor_t xtregs_cp; +#endif + xtregs_user_t xtregs_user; +}; + +#endif + +/* + * macros/functions for gaining access to the thread information structure + */ + +#ifndef __ASSEMBLY__ + +#define INIT_THREAD_INFO(tsk) \ +{ \ + .task = &tsk, \ + .flags = 0, \ + .cpu = 0, \ + .preempt_count = INIT_PREEMPT_COUNT, \ + .addr_limit = KERNEL_DS, \ +} + +/* how to get the thread information struct from C */ +static inline struct thread_info *current_thread_info(void) +{ + struct thread_info *ti; + __asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t" + "xor %0, a1, %0" : "=&r" (ti) : ); + return ti; +} + +#else /* !__ASSEMBLY__ */ + +/* how to get the thread information struct from ASM */ +#define GET_THREAD_INFO(reg,sp) \ + extui reg, sp, 0, CURRENT_SHIFT; \ + xor reg, sp, reg +#endif + + +/* + * 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_SYSCALL_TRACE 0 /* syscall trace active */ +#define TIF_SIGPENDING 1 /* signal pending */ +#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ +#define TIF_SINGLESTEP 3 /* restore singlestep on return to user mode */ +#define TIF_MEMDIE 5 /* is terminating due to OOM killer */ +#define TIF_RESTORE_SIGMASK 6 /* restore signal mask in do_signal() */ +#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ +#define TIF_DB_DISABLED 8 /* debug trap disabled for syscall */ + +#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) +#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) +#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) +#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) + +#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ +#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ + +/* + * 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. + */ +#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */ + +#define THREAD_SIZE KERNEL_STACK_SIZE +#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT) + +#endif /* _XTENSA_THREAD_INFO */ |