include/asm-arm26/processor.h

   1 /*
   2  *  linux/include/asm-arm26/processor.h
   3  *
   4  *  Copyright (C) 1995 Russell King
   5  *  Copyright (C) 2003 Ian Molton
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #ifndef __ASM_ARM_PROCESSOR_H
  13 #define __ASM_ARM_PROCESSOR_H
  14
  15 /*
  16  * Default implementation of macro that returns current
  17  * instruction pointer ("program counter").
  18  */
  19 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  20
  21 #ifdef __KERNEL__
  22
  23 #define MCA_bus 0
  24 #define MCA_bus__is_a_macro
  25
  26 #include <asm/atomic.h>
  27 #include <asm/ptrace.h>
  28 #include <linux/string.h>
  29
  30 #define KERNEL_STACK_SIZE 4096
  31
  32 typedef struct {
  33         void (*put_byte)(void);               /* Special calling convention */
  34         void (*get_byte)(void);               /* Special calling convention */
  35         void (*put_half)(void);               /* Special calling convention */
  36         void (*get_half)(void);               /* Special calling convention */
  37         void (*put_word)(void);               /* Special calling convention */
  38         void (*get_word)(void);               /* Special calling convention */
  39         void (*put_dword)(void);              /* Special calling convention */
  40         unsigned long (*copy_from_user)(void *to, const void *from, unsigned long sz);
  41         unsigned long (*copy_to_user)(void *to, const void *from, unsigned long sz);
  42         unsigned long (*clear_user)(void *addr, unsigned long sz);
  43         unsigned long (*strncpy_from_user)(char *to, const char *from, unsigned long sz);
  44         unsigned long (*strnlen_user)(const char *s, long n);
  45 } uaccess_t;
  46
  47 extern uaccess_t uaccess_user, uaccess_kernel;
  48
  49 #define EXTRA_THREAD_STRUCT                     \
  50         uaccess_t       *uaccess;         /* User access functions*/
  51
  52 #define EXTRA_THREAD_STRUCT_INIT                \
  53         .uaccess        = &uaccess_kernel,
  54
  55 // FIXME?!!
  56
  57 #define start_thread(regs,pc,sp)                                        \
  58 ({                                                                      \
  59         unsigned long *stack = (unsigned long *)sp;                     \
  60         set_fs(USER_DS);                                                \
  61         memzero(regs->uregs, sizeof (regs->uregs));                     \
  62         regs->ARM_pc = pc | ~0xfc000003;        /* pc */                \
  63         regs->ARM_sp = sp;              /* sp */                        \
  64         regs->ARM_r2 = stack[2];        /* r2 (envp) */                 \
  65         regs->ARM_r1 = stack[1];        /* r1 (argv) */                 \
  66         regs->ARM_r0 = stack[0];        /* r0 (argc) */                 \
  67 })
  68
  69 #define KSTK_EIP(tsk)   (((unsigned long *)(4096+(unsigned long)(tsk)))[1020])
  70 #define KSTK_ESP(tsk)   (((unsigned long *)(4096+(unsigned long)(tsk)))[1018])
  71
  72 struct debug_entry {
  73         u32                     address;
  74         u32                     insn;
  75 };
  76
  77 struct debug_info {
  78         int                     nsaved;
  79         struct debug_entry      bp[2];
  80 };
  81
  82 struct thread_struct {
  83                                                         /* fault info     */
  84         unsigned long                   address;
  85         unsigned long                   trap_no;
  86         unsigned long                   error_code;
  87                                                         /* debugging      */
  88         struct debug_info               debug;
  89         EXTRA_THREAD_STRUCT
  90 };
  91
  92 #define INIT_THREAD  { \
  93 EXTRA_THREAD_STRUCT_INIT \
  94 }
  95
  96 /* Forward declaration, a strange C thing */
  97 struct task_struct;
  98
  99 /* Free all resources held by a thread. */
 100 extern void release_thread(struct task_struct *);
 101
 102 unsigned long get_wchan(struct task_struct *p);
 103
 104 #define cpu_relax()                     barrier()
 105
 106 /* Prepare to copy thread state - unlazy all lazy status */
 107 #define prepare_to_copy(tsk)    do { } while (0)
 108
 109 /*
 110  * Create a new kernel thread
 111  */
 112 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 113
 114 #endif
 115
 116 #endif /* __ASM_ARM_PROCESSOR_H */