include/asm-nios2nommu/processor.h

   1 /*--------------------------------------------------------------------
   2  *
   3  * include/asm-nios2nommu/processor.h
   4  *
   5  * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
   6  * Copyright (C) 2001  Ken Hill (khill@microtronix.com)
   7  *                     Vic Phillips (vic@microtronix.com)
   8  * Copyright (C) 2004   Microtronix Datacom Ltd
   9  *
  10  * hacked from:
  11  *      include/asm-sparc/processor.h
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  *
  24  * Jan/20/2004          dgt         NiosII
  25  * Nov/02/2003      dgt     Fix task_size
  26  *
  27  ---------------------------------------------------------------------*/
  28
  29 #ifndef __ASM_NIOS_PROCESSOR_H
  30 #define __ASM_NIOS_PROCESSOR_H
  31
  32 #define NIOS2_FLAG_KTHREAD      0x00000001      /* task is a kernel thread */
  33 #define NIOS2_FLAG_COPROC       0x00000002      /* Thread used coprocess */
  34 #define NIOS2_FLAG_DEBUG        0x00000004      /* task is being debugged */
  35
  36 #define NIOS2_OP_NOP 0x1883a
  37 #define NIOS2_OP_BREAK  0x3da03a
  38
  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 #include <linux/a.out.h>
  48 #include <linux/string.h>
  49
  50 #include <asm/ptrace.h>
  51 #include <asm/signal.h>
  52 #include <asm/segment.h>
  53 #include <asm/current.h>
  54 #include <asm/system.h> /* for get_hi_limit */
  55
  56 /*
  57  * Bus types
  58  */
  59 #define EISA_bus 0
  60 #define EISA_bus__is_a_macro /* for versions in ksyms.c */
  61 #define MCA_bus 0
  62 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
  63
  64 /*
  65  * The nios has no problems with write protection
  66  */
  67 #define wp_works_ok 1
  68 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
  69
  70 /* Whee, this is STACK_TOP and the lowest kernel address too... */
  71 #if 0
  72 #define KERNBASE        0x00000000  /* First address the kernel will eventually be */
  73 #define TASK_SIZE       (KERNBASE)
  74 #define MAX_USER_ADDR   TASK_SIZE
  75 #define MMAP_SEARCH_START (TASK_SIZE/3)
  76 #endif
  77
  78 #define TASK_SIZE       ((unsigned int) nasys_program_mem_end)   //...this is better...
  79
  80 /*
  81  * This decides where the kernel will search for a free chunk of vm
  82  * space during mmap's. We won't be using it
  83  */
  84 #define TASK_UNMAPPED_BASE      0
  85
  86 /* The Nios processor specific thread struct. */
  87 struct thread_struct {
  88         struct pt_regs *kregs;
  89
  90         /* For signal handling */
  91         unsigned long sig_address;
  92         unsigned long sig_desc;
  93
  94         /* Context switch saved kernel state. */
  95         unsigned long ksp;
  96         unsigned long kpsr;
  97         unsigned long kesr;
  98
  99         /* Flags are defined below */
 100
 101         unsigned long flags;
 102         int current_ds;
 103         struct exec core_exec;     /* just what it says. */
 104 };
 105
 106 #define INIT_MMAP { &init_mm, (0), (0), \
 107                     __pgprot(0x0) , VM_READ | VM_WRITE | VM_EXEC }
 108
 109 #define INIT_THREAD  { \
 110         .kregs          = 0,                    \
 111         .sig_address    = 0,                    \
 112         .sig_desc       = 0,                    \
 113         .ksp            = 0,                    \
 114         .kpsr           = 0,                    \
 115         .kesr           = PS_S,                 \
 116         .flags          = NIOS2_FLAG_KTHREAD,   \
 117         .current_ds     = __KERNEL_DS,          \
 118         .core_exec      = INIT_EXEC             \
 119 }
 120
 121 /* Free all resources held by a thread. */
 122 extern void release_thread(struct task_struct *);
 123
 124 extern unsigned long thread_saved_pc(struct task_struct *t);
 125
 126 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
 127
 128 /* Prepare to copy thread state - unlazy all lazy status */
 129 #define prepare_to_copy(tsk)    do { } while (0)
 130
 131 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 132
 133 unsigned long get_wchan(struct task_struct *p);
 134
 135 #define KSTK_EIP(tsk)  ((tsk)->thread.kregs->ea)
 136 #define KSTK_ESP(tsk)  ((tsk)->thread.kregs->sp)
 137
 138 #ifdef __KERNEL__
 139 /* Allocation and freeing of basic task resources. */
 140
 141 //;dgt2;#define alloc_task_struct() ((struct task_struct *) xx..see..linux..fork..xx __get_free_pages(GFP_KERNEL,1))
 142 //;dgt2;#define get_task_struct(tsk) xx..see..linux..sched.h...atomic_inc(&mem_map[MAP_NR(tsk)].count)
 143
 144 #endif
 145
 146 #define cpu_relax()    do { } while (0)
 147 #endif /* __ASSEMBLY__ */
 148 #endif /* __ASM_NIOS_PROCESSOR_H */