1 files changed, 127 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
new file mode 100644
index 00000000000..3659e460071
--- /dev/null
+++ b/arch/arm64/include/asm/thread_info.h
@@ -0,0 +1,127 @@
+/*
+ * Based on arch/arm/include/asm/thread_info.h
+ *
+ * Copyright (C) 2002 Russell King.
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_THREAD_INFO_H
+#define __ASM_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+#include <linux/compiler.h>
+
+#ifndef CONFIG_ARM64_64K_PAGES
+#define THREAD_SIZE_ORDER       1
+#endif
+
+#define THREAD_SIZE             8192
+#define THREAD_START_SP         (THREAD_SIZE - 16)
+
+#ifndef __ASSEMBLY__
+
+struct task_struct;
+struct exec_domain;
+
+#include <asm/types.h>
+
+typedef unsigned long mm_segment_t;
+
+/*
+ * low level task data that entry.S needs immediate access to.
+ * __switch_to() assumes cpu_context follows immediately after cpu_domain.
+ */
+struct thread_info {
+        unsigned long           flags;          /* low level flags */
+        mm_segment_t            addr_limit;     /* address limit */
+        struct task_struct      *task;          /* main task structure */
+        struct exec_domain      *exec_domain;   /* execution domain */
+        struct restart_block    restart_block;
+        int                     preempt_count;  /* 0 => preemptable, <0 => bug */
+        int                     cpu;            /* cpu */
+};
+
+#define INIT_THREAD_INFO(tsk)                                           \
+{                                                                       \
+        .task           = &tsk,                                         \
+        .exec_domain    = &default_exec_domain,                         \
+        .flags          = 0,                                            \
+        .preempt_count  = INIT_PREEMPT_COUNT,                           \
+        .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
+ */
+static inline struct thread_info *current_thread_info(void) __attribute_const__;
+
+static inline struct thread_info *current_thread_info(void)
+{
+        register unsigned long sp asm ("sp");
+        return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
+}
+
+#define thread_saved_pc(tsk)    \
+        ((unsigned long)(tsk->thread.cpu_context.pc))
+#define thread_saved_sp(tsk)    \
+        ((unsigned long)(tsk->thread.cpu_context.sp))
+#define thread_saved_fp(tsk)    \
+        ((unsigned long)(tsk->thread.cpu_context.fp))
+
+#endif
+
+/*
+ * We use bit 30 of the preempt_count to indicate that kernel
+ * preemption is occurring.  See <asm/hardirq.h>.
+ */
+#define PREEMPT_ACTIVE  0x40000000
+
+/*
+ * thread information flags:
+ *  TIF_SYSCALL_TRACE   - syscall trace active
+ *  TIF_SIGPENDING      - signal pending
+ *  TIF_NEED_RESCHED    - rescheduling necessary
+ *  TIF_NOTIFY_RESUME   - callback before returning to user
+ *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
+ *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
+ */
+#define TIF_SIGPENDING          0
+#define TIF_NEED_RESCHED        1
+#define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
+#define TIF_SYSCALL_TRACE       8
+#define TIF_POLLING_NRFLAG      16
+#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
+#define TIF_FREEZE              19
+#define TIF_RESTORE_SIGMASK     20
+#define TIF_SINGLESTEP          21
+#define TIF_32BIT               22      /* 32bit process */
+#define TIF_SWITCH_MM           23      /* deferred switch_mm */
+
+#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
+#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
+#define _TIF_32BIT              (1 << TIF_32BIT)
+
+#define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
+                                 _TIF_NOTIFY_RESUME)
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_THREAD_INFO_H */