This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-xtensa / thread_info.h

diff --git a/include/asm-xtensa/thread_info.h b/include/asm-xtensa/thread_info.h
new file mode 100644 (file)
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+++ b/include/asm-xtensa/thread_info.h
@@ -0,0 +1,144 @@
+/*
+ * 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
+
+#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 */
+       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;
+
+
+};
+
+#else /* !__ASSEMBLY__ */
+
+/* offsets into the thread_info struct for assembly code access */
+#define TI_TASK                 0x00000000
+#define TI_EXEC_DOMAIN  0x00000004
+#define TI_FLAGS        0x00000008
+#define TI_STATUS       0x0000000C
+#define TI_CPU          0x00000010
+#define TI_PRE_COUNT    0x00000014
+#define TI_ADDR_LIMIT   0x00000018
+#define TI_RESTART_BLOCK 0x000001C
+
+#endif
+
+#define PREEMPT_ACTIVE         0x10000000
+
+/*
+ * 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)
+
+/* 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,a1,0,13\n\t"
+                "xor %0, a1, %0" : "=&r" (ti) : );
+       return ti;
+}
+
+/* thread information allocation */
+#define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
+#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
+
+#else /* !__ASSEMBLY__ */
+
+/* how to get the thread information struct from ASM */
+#define GET_THREAD_INFO(reg,sp) \
+       extui reg, sp, 0, 13; \
+       xor   reg, sp, 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
+ */
+#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 */
+#define TIF_SINGLESTEP         4       /* restore singlestep on return to user mode */
+#define TIF_IRET               5       /* return with iret */
+#define TIF_MEMDIE             6
+#define TIF_POLLING_NRFLAG     16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
+
+#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_WORK_MASK         0x0000FFFE      /* work to do on interrupt/exception return */
+#define _TIF_ALLWORK_MASK      0x0000FFFF      /* work to do on any return to u-space */
+
+/*
+ * 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 THREAD_SIZE 8192       //(2*PAGE_SIZE)
+
+#endif /* __KERNEL__ */
+#endif /* _XTENSA_THREAD_INFO */