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 EISA_bus 0
  24 #define MCA_bus 0
  25 #define MCA_bus__is_a_macro
  26
  27 #include <asm/atomic.h>
  28 #include <asm/ptrace.h>
  29 #include <linux/string.h>
  30
  31 #define KERNEL_STACK_SIZE 4096
  32
  33 typedef struct {
  34         void (*put_byte)(void);               /* Special calling convention */
  35         void (*get_byte)(void);               /* Special calling convention */
  36         void (*put_half)(void);               /* Special calling convention */
  37         void (*get_half)(void);               /* Special calling convention */
  38         void (*put_word)(void);               /* Special calling convention */
  39         void (*get_word)(void);               /* Special calling convention */
  40         void (*put_dword)(void);              /* Special calling convention */
  41         unsigned long (*copy_from_user)(void *to, const void *from, unsigned long sz);
  42         unsigned long (*copy_to_user)(void *to, const void *from, unsigned long sz);
  43         unsigned long (*clear_user)(void *addr, unsigned long sz);
  44         unsigned long (*strncpy_from_user)(char *to, const char *from, unsigned long sz);
  45         unsigned long (*strnlen_user)(const char *s, long n);
  46 } uaccess_t;
  47
  48 extern uaccess_t uaccess_user, uaccess_kernel;
  49
  50 #define EXTRA_THREAD_STRUCT                     \
  51         uaccess_t       *uaccess;         /* User access functions*/
  52
  53 #define EXTRA_THREAD_STRUCT_INIT                \
  54         uaccess:        &uaccess_kernel,
  55
  56 // FIXME?!!
  57
  58 #define start_thread(regs,pc,sp)                                        \
  59 ({                                                                      \
  60         unsigned long *stack = (unsigned long *)sp;                     \
  61         set_fs(USER_DS);                                                \
  62         memzero(regs->uregs, sizeof (regs->uregs));                     \
  63         regs->ARM_pc = pc | ~0xfc000003;        /* pc */                \
  64         regs->ARM_sp = sp;              /* sp */                        \
  65         regs->ARM_r2 = stack[2];        /* r2 (envp) */                 \
  66         regs->ARM_r1 = stack[1];        /* r1 (argv) */                 \
  67         regs->ARM_r0 = stack[0];        /* r0 (argc) */                 \
  68 })
  69
  70 #define KSTK_EIP(tsk)   (((unsigned long *)(4096+(unsigned long)(tsk)))[1020])
  71 #define KSTK_ESP(tsk)   (((unsigned long *)(4096+(unsigned long)(tsk)))[1018])
  72
  73 struct debug_entry {
  74         u32                     address;
  75         u32                     insn;
  76 };
  77
  78 struct debug_info {
  79         int                     nsaved;
  80         struct debug_entry      bp[2];
  81 };
  82
  83 struct thread_struct {
  84                                                         /* fault info     */
  85         unsigned long                   address;
  86         unsigned long                   trap_no;
  87         unsigned long                   error_code;
  88                                                         /* debugging      */
  89         struct debug_info               debug;
  90         EXTRA_THREAD_STRUCT
  91 };
  92
  93 #define INIT_THREAD  { \
  94 EXTRA_THREAD_STRUCT_INIT \
  95 }
  96
  97 /* Forward declaration, a strange C thing */
  98 struct task_struct;
  99
 100 /* Free all resources held by a thread. */
 101 extern void release_thread(struct task_struct *);
 102
 103 unsigned long get_wchan(struct task_struct *p);
 104
 105 #define cpu_relax()                     barrier()
 106
 107 /* Prepare to copy thread state - unlazy all lazy status */
 108 #define prepare_to_copy(tsk)    do { } while (0)
 109
 110 /*
 111  * Create a new kernel thread
 112  */
 113 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 114
 115 #endif
 116
 117 #endif /* __ASM_ARM_PROCESSOR_H */