summaryrefslogtreecommitdiffstats
path: root/kernel/arch/m32r/include/asm/thread_info.h
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/arch/m32r/include/asm/thread_info.h')
-rw-r--r--kernel/arch/m32r/include/asm/thread_info.h128
1 files changed, 128 insertions, 0 deletions
diff --git a/kernel/arch/m32r/include/asm/thread_info.h b/kernel/arch/m32r/include/asm/thread_info.h
new file mode 100644
index 000000000..f630d9c30
--- /dev/null
+++ b/kernel/arch/m32r/include/asm/thread_info.h
@@ -0,0 +1,128 @@
+#ifndef _ASM_M32R_THREAD_INFO_H
+#define _ASM_M32R_THREAD_INFO_H
+
+/* thread_info.h: m32r low-level thread information
+ *
+ * Copyright (C) 2002 David Howells (dhowells@redhat.com)
+ * - Incorporating suggestions made by Linus Torvalds and Dave Miller
+ * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
+ */
+
+#ifdef __KERNEL__
+
+#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__
+
+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 */
+ int preempt_count; /* 0 => preemptable, <0 => BUG */
+
+ mm_segment_t addr_limit; /* thread address space:
+ 0-0xBFFFFFFF for user-thread
+ 0-0xFFFFFFFF for kernel-thread
+ */
+
+ __u8 supervisor_stack[0];
+};
+
+#endif /* !__ASSEMBLY__ */
+
+#define THREAD_SIZE (PAGE_SIZE << 1)
+#define THREAD_SIZE_ORDER 1
+/*
+ * 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, \
+}
+
+#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 */
+static inline struct thread_info *current_thread_info(void)
+{
+ struct thread_info *ti;
+
+ __asm__ __volatile__ (
+ "ldi %0, #%1 \n\t"
+ "and %0, sp \n\t"
+ : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
+ );
+
+ return ti;
+}
+
+#define TI_FLAG_FAULT_CODE_SHIFT 28
+
+static inline void set_thread_fault_code(unsigned int val)
+{
+ struct thread_info *ti = current_thread_info();
+ ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
+ | (val << TI_FLAG_FAULT_CODE_SHIFT);
+}
+
+static inline unsigned int get_thread_fault_code(void)
+{
+ struct thread_info *ti = current_thread_info();
+ return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
+}
+
+#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_NOTIFY_RESUME 5 /* callback before returning to user */
+#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
+#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
+#define TIF_MEMDIE 18 /* 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_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
+#define _TIF_USEDFPU (1<<TIF_USEDFPU)
+
+#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
+#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
+
+/*
+ * 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) */
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_M32R_THREAD_INFO_H */