1 files changed, 169 insertions, 0 deletions

diff --git a/include/asm-x86/thread_info_64.h b/include/asm-x86/thread_info_64.h
new file mode 100644
index 000000000000..beae2bfb62ca
--- /dev/null
+++ b/include/asm-x86/thread_info_64.h
@@ -0,0 +1,169 @@
+/* thread_info.h: x86_64 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 <asm/page.h>
+#include <asm/types.h>
+#include <asm/pda.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
+ */
+#ifndef __ASSEMBLY__
+struct task_struct;
+struct exec_domain;
+#include <asm/mmsegment.h>
+
+struct thread_info {
+        struct task_struct      *task;          /* main task structure */
+        struct exec_domain      *exec_domain;   /* execution domain */
+        __u32                   flags;          /* low level flags */
+        __u32                   status;         /* thread synchronous flags */
+        __u32                   cpu;            /* current CPU */
+        int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
+
+        mm_segment_t            addr_limit;     
+        struct restart_block    restart_block;
+};
+#endif
+
+/*
+ * macros/functions for gaining access to the thread information structure
+ * preempt_count needs to be 1 initially, until the scheduler is functional.
+ */
+#ifndef __ASSEMBLY__
+#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)
+
+static inline struct thread_info *current_thread_info(void)
+{ 
+        struct thread_info *ti;
+        ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
+        return ti; 
+}
+
+/* do not use in interrupt context */
+static inline struct thread_info *stack_thread_info(void)
+{
+        struct thread_info *ti;
+        __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1)));
+        return ti;
+}
+
+/* thread information allocation */
+#ifdef CONFIG_DEBUG_STACK_USAGE
+#define alloc_thread_info(tsk)                                  \
+    ({                                                          \
+        struct thread_info *ret;                                \
+                                                                \
+        ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)); \
+        if (ret)                                                \
+                memset(ret, 0, THREAD_SIZE);                    \
+        ret;                                                    \
+    })
+#else
+#define alloc_thread_info(tsk) \
+        ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER))
+#endif
+
+#define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
+
+#else /* !__ASSEMBLY__ */
+
+/* how to get the thread information struct from ASM */
+#define GET_THREAD_INFO(reg) \
+        movq %gs:pda_kernelstack,reg ; \
+        subq $(THREAD_SIZE-PDA_STACKOFFSET),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
+ * Warning: layout of LSW is hardcoded in entry.S
+ */
+#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
+#define TIF_SIGPENDING          2       /* signal pending */
+#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
+#define TIF_SINGLESTEP          4       /* reenable singlestep on user return*/
+#define TIF_IRET                5       /* force IRET */
+#define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
+#define TIF_SECCOMP             8       /* secure computing */
+#define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal */
+#define TIF_MCE_NOTIFY          10      /* notify userspace of an MCE */
+/* 16 free */
+#define TIF_IA32                17      /* 32bit process */ 
+#define TIF_FORK                18      /* ret_from_fork */
+#define TIF_ABI_PENDING         19
+#define TIF_MEMDIE              20
+#define TIF_DEBUG               21      /* uses debug registers */
+#define TIF_IO_BITMAP           22      /* uses I/O bitmap */
+#define TIF_FREEZE              23      /* is freezing for suspend */
+
+#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
+#define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
+#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
+#define _TIF_IRET               (1<<TIF_IRET)
+#define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
+#define _TIF_SECCOMP            (1<<TIF_SECCOMP)
+#define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
+#define _TIF_MCE_NOTIFY         (1<<TIF_MCE_NOTIFY)
+#define _TIF_IA32               (1<<TIF_IA32)
+#define _TIF_FORK               (1<<TIF_FORK)
+#define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
+#define _TIF_DEBUG              (1<<TIF_DEBUG)
+#define _TIF_IO_BITMAP          (1<<TIF_IO_BITMAP)
+#define _TIF_FREEZE             (1<<TIF_FREEZE)
+
+/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK \
+  (0x0000FFFF & ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP|_TIF_SECCOMP))
+/* work to do on any return to user space */
+#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
+
+/* flags to check in __switch_to() */
+#define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP)
+
+#define PREEMPT_ACTIVE     0x10000000
+
+/*
+ * 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 TS_COMPAT               0x0002  /* 32bit syscall active */
+#define TS_POLLING              0x0004  /* true if in idle loop and not sleeping */
+
+#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_THREAD_INFO_H */