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   1 /*
   2  *  linux/include/asm-arm/processor.h
   3  *
   4  *  Copyright (C) 1995-1999 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #ifndef __ASM_ARM_PROCESSOR_H
  12 #define __ASM_ARM_PROCESSOR_H
  13
  14 /*
  15  * Default implementation of macro that returns current
  16  * instruction pointer ("program counter").
  17  */
  18 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  19
  20 #ifdef __KERNEL__
  21
  22 #include <asm/ptrace.h>
  23 #include <asm/procinfo.h>
  24 #include <asm/types.h>
  25
  26 union debug_insn {
  27         u32     arm;
  28         u16     thumb;
  29 };
  30
  31 struct debug_entry {
  32         u32                     address;
  33         union debug_insn        insn;
  34 };
  35
  36 struct debug_info {
  37         int                     nsaved;
  38         struct debug_entry      bp[2];
  39 };
  40
  41 struct thread_struct {
  42                                                         /* fault info     */
  43         unsigned long           address;
  44         unsigned long           trap_no;
  45         unsigned long           error_code;
  46                                                         /* debugging      */
  47         struct debug_info       debug;
  48 };
  49
  50 #define INIT_THREAD  {  }
  51
  52 #define start_thread(regs,pc,sp)                                        \
  53 ({                                                                      \
  54         unsigned long *stack = (unsigned long *)sp;                     \
  55         set_fs(USER_DS);                                                \
  56         memzero(regs->uregs, sizeof(regs->uregs));                      \
  57         if (current->personality & ADDR_LIMIT_32BIT)                    \
  58                 regs->ARM_cpsr = USR_MODE;                              \
  59         else                                                            \
  60                 regs->ARM_cpsr = USR26_MODE;                            \
  61         if (elf_hwcap & HWCAP_THUMB && pc & 1)                          \
  62                 regs->ARM_cpsr |= PSR_T_BIT;                            \
  63         regs->ARM_pc = pc & ~1;         /* 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 /* Forward declaration, a strange C thing */
  71 struct task_struct;
  72
  73 /* Free all resources held by a thread. */
  74 extern void release_thread(struct task_struct *);
  75
  76 /* Prepare to copy thread state - unlazy all lazy status */
  77 #define prepare_to_copy(tsk)    do { } while (0)
  78
  79 unsigned long get_wchan(struct task_struct *p);
  80
  81 #define cpu_relax()                     barrier()
  82
  83 /*
  84  * Create a new kernel thread
  85  */
  86 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  87
  88 #define KSTK_REGS(tsk)  (((struct pt_regs *)(THREAD_START_SP + (unsigned long)(tsk)->thread_info)) - 1)
  89 #define KSTK_EIP(tsk)   KSTK_REGS(tsk)->ARM_pc
  90 #define KSTK_ESP(tsk)   KSTK_REGS(tsk)->ARM_sp
  91
  92 /*
  93  * Prefetching support - only ARMv5.
  94  */
  95 #if __LINUX_ARM_ARCH__ >= 5
  96
  97 #define ARCH_HAS_PREFETCH
  98 #define prefetch(ptr)                           \
  99         ({                                      \
 100                 __asm__ __volatile__(           \
 101                 "pld\t%0"                       \
 102                 :                               \
 103                 : "o" (*(char *)(ptr))          \
 104                 : "cc");                        \
 105         })
 106
 107 #define ARCH_HAS_PREFETCHW
 108 #define prefetchw(ptr)  prefetch(ptr)
 109
 110 #define ARCH_HAS_SPINLOCK_PREFETCH
 111 #define spin_lock_prefetch(x) do { } while (0)
 112
 113 #endif
 114
 115 #endif
 116
 117 #endif /* __ASM_ARM_PROCESSOR_H */