LXR linux/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. */
  51struct 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
  68extern void start_thread(struct pt_regs *regs, unsigned long pc,
  69                        unsigned long sp);
  70
  71struct task_struct;
  72
  73/* Free all resources held by a thread. */
  74static inline void release_thread(struct task_struct *dead_task)
  75{
  76}
  77
  78/* Return saved PC of a blocked thread. */
  79#define thread_saved_pc(tsk)    ((tsk)->thread.kregs->ea)
  80
  81extern unsigned long get_wchan(struct task_struct *p);
  82
  83#define task_pt_regs(p) \
  84        ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
  85
  86/* Used by procfs */
  87#define KSTK_EIP(tsk)   ((tsk)->thread.kregs->ea)
  88#define KSTK_ESP(tsk)   ((tsk)->thread.kregs->sp)
  89
  90#define cpu_relax()     barrier()
  91
  92#endif /* __ASSEMBLY__ */
  93
  94#endif /* _ASM_NIOS2_PROCESSOR_H */
  95