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 /*
  42  * Default implementation of macro that returns current
  43  * instruction pointer ("program counter").
  44  */
  45 #define current_text_addr() ({ __label__ _l; _l: &&_l; })
  46
  47 # define TASK_SIZE              0x7FFF0000UL
  48 # define TASK_UNMAPPED_BASE     (PAGE_ALIGN(TASK_SIZE / 3))
  49
  50 /* The Nios processor specific thread struct. */
  51 struct thread_struct {
  52         struct pt_regs *kregs;
  53
  54         /* Context switch saved kernel state. */
  55         unsigned long ksp;
  56         unsigned long kpsr;
  57 };
  58
  59 #define INIT_MMAP \
  60         { &init_mm, (0), (0), __pgprot(0x0), VM_READ | VM_WRITE | VM_EXEC }
  61
  62 # define INIT_THREAD {                  \
  63         .kregs  = NULL,                 \
  64         .ksp    = 0,                    \
  65         .kpsr   = 0,                    \
  66 }
  67
  68 extern void start_thread(struct pt_regs *regs, unsigned long pc,
  69                         unsigned long sp);
  70
  71 struct task_struct;
  72
  73 /* Free all resources held by a thread. */
  74 static inline void release_thread(struct task_struct *dead_task)
  75 {
  76 }
  77
  78 /* Free current thread data structures etc.. */
  79 static inline void exit_thread(void)
  80 {
  81 }
  82
  83 /* Return saved PC of a blocked thread. */
  84 #define thread_saved_pc(tsk)    ((tsk)->thread.kregs->ea)
  85
  86 extern unsigned long get_wchan(struct task_struct *p);
  87
  88 #define task_pt_regs(p) \
  89         ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
  90
  91 /* Used by procfs */
  92 #define KSTK_EIP(tsk)   ((tsk)->thread.kregs->ea)
  93 #define KSTK_ESP(tsk)   ((tsk)->thread.kregs->sp)
  94
  95 #define cpu_relax()     barrier()
  96 #define cpu_relax_lowlatency()  cpu_relax()
  97
  98 #endif /* __ASSEMBLY__ */
  99
 100 #endif /* _ASM_NIOS2_PROCESSOR_H */