include/asm-v850/processor.h

   1 /*
   2  * include/asm-v850/processor.h
   3  *
   4  *  Copyright (C) 2001,02,03  NEC Electronics Corporation
   5  *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License.  See the file COPYING in the main directory of this
   9  * archive for more details.
  10  *
  11  * Written by Miles Bader <miles@gnu.org>
  12  */
  13
  14 #ifndef __V850_PROCESSOR_H__
  15 #define __V850_PROCESSOR_H__
  16
  17 #ifndef __ASSEMBLY__ /* <linux/thread_info.h> is not asm-safe.  */
  18 #include <linux/thread_info.h>
  19 #endif
  20
  21 #include <asm/ptrace.h>
  22 #include <asm/entry.h>
  23
  24 /* Some code expects `segment' stuff to be defined here.  */
  25 #include <asm/segment.h>
  26
  27
  28 /*
  29  * The only places this is used seem to be horrible bletcherous kludges,
  30  * so we just define it to be as large as possible.
  31  */
  32 #define TASK_SIZE       (0xFFFFFFFF)
  33
  34 /*
  35  * This decides where the kernel will search for a free chunk of vm
  36  * space during mmap's.  We won't be using it.
  37  */
  38 #define TASK_UNMAPPED_BASE      0
  39
  40
  41 #ifndef __ASSEMBLY__
  42
  43
  44 /*
  45  * Default implementation of macro that returns current
  46  * instruction pointer ("program counter").
  47  */
  48 #define current_text_addr()     ({ __label__ _l; _l: &&_l;})
  49
  50 /* If you change this, you must change the associated assembly-languages
  51    constants defined below, THREAD_*.  */
  52 struct thread_struct {
  53         /* kernel stack pointer (must be first field in structure) */
  54         unsigned long  ksp;
  55 };
  56
  57 #define INIT_THREAD { sizeof init_stack + (unsigned long)init_stack }
  58
  59
  60 /* Do necessary setup to start up a newly executed thread.  */
  61 static inline void start_thread (struct pt_regs *regs,
  62                                  unsigned long pc, unsigned long usp)
  63 {
  64         regs->pc = pc;
  65         regs->gpr[GPR_SP] = usp;
  66         regs->kernel_mode = 0;
  67 }
  68
  69 /* Free all resources held by a thread. */
  70 static inline void release_thread (struct task_struct *dead_task)
  71 {
  72 }
  73
  74 /* Prepare to copy thread state - unlazy all lazy status */
  75 #define prepare_to_copy(tsk)    do { } while (0)
  76
  77 extern int kernel_thread (int (*fn)(void *), void * arg, unsigned long flags);
  78
  79 /* Free current thread data structures etc.  */
  80 static inline void exit_thread (void)
  81 {
  82 }
  83
  84
  85 /* Return the registers saved during context-switch by the currently
  86    not-running thread T.  Note that this only includes some registers!
  87    See entry.S for details.  */
  88 #define thread_saved_regs(t) \
  89    ((struct pt_regs*)((t)->thread.ksp + STATE_SAVE_PT_OFFSET))
  90 /* Return saved (kernel) PC of a blocked thread.  Actually, we return the
  91    LP register, because the thread is actually blocked in switch_thread,
  92    and we're interested in the PC it will _return_ to.  */
  93 #define thread_saved_pc(t)   (thread_saved_regs(t)->gpr[GPR_LP])
  94
  95
  96 unsigned long get_wchan (struct task_struct *p);
  97
  98
  99 /* Return some info about the user process TASK.  */
 100 #define task_tos(task)  ((unsigned long)task_stack_page(task) + THREAD_SIZE)
 101 #define task_pt_regs(task) ((struct pt_regs *)task_tos (task) - 1)
 102 #define task_sp(task)   (task_pt_regs (task)->gpr[GPR_SP])
 103 #define task_pc(task)   (task_pt_regs (task)->pc)
 104 /* Grotty old names for some.  */
 105 #define KSTK_EIP(task)  task_pc (task)
 106 #define KSTK_ESP(task)  task_sp (task)
 107
 108
 109 #define cpu_relax()    ((void)0)
 110
 111
 112 #else /* __ASSEMBLY__ */
 113
 114 #define THREAD_KSP      0
 115
 116 #endif /* !__ASSEMBLY__ */
 117
 118
 119 #endif /* __V850_PROCESSOR_H__ */