| /* |
| * 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 <linux/stringify.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; |
| #if XCHAL_HAVE_EXCLUSIVE |
| /* result of the most recent exclusive store */ |
| unsigned long atomctl8; |
| #endif |
| |
| /* 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 |
| */ |
| #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_SYSCALL_TRACEPOINT 4 /* syscall tracepoint instrumentation */ |
| #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ |
| #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_AUDIT 9 /* syscall auditing active */ |
| #define TIF_SECCOMP 10 /* secure computing */ |
| #define TIF_MEMDIE 11 /* is terminating due to OOM killer */ |
| |
| #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_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) |
| #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) |
| #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) |
| #define _TIF_SECCOMP (1<<TIF_SECCOMP) |
| |
| #define _TIF_WORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ |
| _TIF_SYSCALL_TRACEPOINT | \ |
| _TIF_SYSCALL_AUDIT | _TIF_SECCOMP) |
| |
| #define THREAD_SIZE KERNEL_STACK_SIZE |
| #define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT) |
| |
| #endif /* _XTENSA_THREAD_INFO */ |