microblaze_v8: string.h thread_info.h

Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 159 insertions, 0 deletions

diff --git a/arch/microblaze/include/asm/thread_info.h b/arch/microblaze/include/asm/thread_info.h
new file mode 100644
index 000000000000..4c3943e3f403
--- /dev/null
+++ b/arch/microblaze/include/asm/thread_info.h
@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * 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.
+ */
+
+#ifndef _ASM_MICROBLAZE_THREAD_INFO_H
+#define _ASM_MICROBLAZE_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+/* we have 8k stack */
+#define THREAD_SHIFT            13
+#define THREAD_SIZE             (1 << THREAD_SHIFT)
+#define THREAD_SIZE_ORDER       1
+
+#ifndef __ASSEMBLY__
+# include <linux/types.h>
+# include <asm/processor.h>
+# include <asm/segment.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
+ * - if the contents of this structure are changed, the assembly constants
+ *       must also be changed
+ */
+
+struct cpu_context {
+        __u32   r1; /* stack pointer */
+        __u32   r2;
+        /* dedicated registers */
+        __u32   r13;
+        __u32   r14;
+        __u32   r15;
+        __u32   r16;
+        __u32   r17;
+        __u32   r18;
+        /* non-volatile registers */
+        __u32   r19;
+        __u32   r20;
+        __u32   r21;
+        __u32   r22;
+        __u32   r23;
+        __u32   r24;
+        __u32   r25;
+        __u32   r26;
+        __u32   r27;
+        __u32   r28;
+        __u32   r29;
+        __u32   r30;
+        /* r31 is used as current task pointer */
+        /* special purpose registers */
+        __u32   msr;
+        __u32   ear;
+        __u32   esr;
+        __u32   fsr;
+};
+
+struct thread_info {
+        struct task_struct      *task; /* main task structure */
+        struct exec_domain      *exec_domain; /* execution domain */
+        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 */
+        struct restart_block    restart_block;
+
+        struct cpu_context      cpu_context;
+};
+
+/*
+ * macros/functions for gaining access to the thread information structure
+ *
+ * preempt_count needs to be 1 initially, until the scheduler is functional.
+ */
+#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)
+
+/* how to get the thread information struct from C */
+static inline struct thread_info *current_thread_info(void)
+{
+        register unsigned long sp asm("r1");
+
+        return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
+}
+
+/* thread information allocation */
+#endif /* __ASSEMBLY__ */
+
+#define PREEMPT_ACTIVE          0x10000000
+
+/*
+ * 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_NOTIFY_RESUME       1 /* resumption notification requested */
+#define TIF_SIGPENDING          2 /* signal pending */
+#define TIF_NEED_RESCHED        3 /* rescheduling necessary */
+/* restore singlestep on return to user mode */
+#define TIF_SINGLESTEP          4
+#define TIF_IRET                5 /* return with iret */
+#define TIF_MEMDIE              6
+#define TIF_FREEZE              14      /* Freezing for suspend */
+
+/* FIXME change in entry.S */
+#define TIF_KERNEL_TRACE        8       /* kernel trace active */
+
+/* true if poll_idle() is polling TIF_NEED_RESCHED */
+#define TIF_POLLING_NRFLAG      16
+
+#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
+#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
+#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
+#define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
+#define _TIF_IRET               (1<<TIF_IRET)
+#define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
+#define _TIF_FREEZE             (1<<TIF_FREEZE)
+#define _TIF_KERNEL_TRACE       (1 << TIF_KERNEL_TRACE)
+
+/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK          0x0000FFFE
+/* work to do on any return to u-space */
+#define _TIF_ALLWORK_MASK       0x0000FFFF
+
+/*
+ * 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.
+ */
+/* FPU was used by this task this quantum (SMP) */
+#define TS_USEDFPU              0x0001
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */