arch/nios2/include/asm/processor.h

   1 /*
   2  * Copyright (C) 2013 Altera Corporation
   3  * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
   4  * Copyright (C) 2004 Microtronix Datacom Ltd
   5  * Copyright (C) 2001 Ken Hill (khill@microtronix.com)
   6  *                    Vic Phillips (vic@microtronix.com)
   7  *
   8  * based on SPARC asm/processor_32.h which is:
   9  *
  10  * Copyright (C) 1994 David S. Miller
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file "COPYING" in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 #ifndef _ASM_NIOS2_PROCESSOR_H
  18 #define _ASM_NIOS2_PROCESSOR_H
  19
  20 #include <asm/ptrace.h>
  21 #include <asm/registers.h>
  22 #include <asm/page.h>
  23
  24 #define NIOS2_FLAG_KTHREAD      0x00000001      /* task is a kernel thread */
  25
  26 #define NIOS2_OP_NOP            0x1883a
  27 #define NIOS2_OP_BREAK          0x3da03a
  28
  29 #ifdef __KERNEL__
  30
  31 #define STACK_TOP       TASK_SIZE
  32 #define STACK_TOP_MAX   STACK_TOP
  33
  34 #endif /* __KERNEL__ */
  35
  36 /* Kuser helpers is mapped to this user space address */
  37 #define KUSER_BASE              0x1000
  38 #define KUSER_SIZE              (PAGE_SIZE)
  39 #ifndef __ASSEMBLY__
  40
  41 # define TASK_SIZE              0x7FFF0000UL
  42 # define TASK_UNMAPPED_BASE     (PAGE_ALIGN(TASK_SIZE / 3))
  43
  44 /* The Nios processor specific thread struct. */
  45 struct thread_struct {
  46         struct pt_regs *kregs;
  47
  48         /* Context switch saved kernel state. */
  49         unsigned long ksp;
  50         unsigned long kpsr;
  51 };
  52
  53 #define INIT_MMAP \
  54         { &init_mm, (0), (0), __pgprot(0x0), VM_READ | VM_WRITE | VM_EXEC }
  55
  56 # define INIT_THREAD {                  \
  57         .kregs  = NULL,                 \
  58         .ksp    = 0,                    \
  59         .kpsr   = 0,                    \
  60 }
  61
  62 extern void start_thread(struct pt_regs *regs, unsigned long pc,
  63                         unsigned long sp);
  64
  65 struct task_struct;
  66
  67 /* Free all resources held by a thread. */
  68 static inline void release_thread(struct task_struct *dead_task)
  69 {
  70 }
  71
  72 extern unsigned long get_wchan(struct task_struct *p);
  73
  74 #define task_pt_regs(p) \
  75         ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
  76
  77 /* Used by procfs */
  78 #define KSTK_EIP(tsk)   ((tsk)->thread.kregs->ea)
  79 #define KSTK_ESP(tsk)   ((tsk)->thread.kregs->sp)
  80
  81 #define cpu_relax()     barrier()
  82
  83 #endif /* __ASSEMBLY__ */
  84
  85 #endif /* _ASM_NIOS2_PROCESSOR_H */