include/asm-arm/processor.h

   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/types.h>
  24
  25 union debug_insn {
  26         u32     arm;
  27         u16     thumb;
  28 };
  29
  30 struct debug_entry {
  31         u32                     address;
  32         union debug_insn        insn;
  33 };
  34
  35 struct debug_info {
  36         int                     nsaved;
  37         struct debug_entry      bp[2];
  38 };
  39
  40 struct thread_struct {
  41                                                         /* fault info     */
  42         unsigned long           address;
  43         unsigned long           trap_no;
  44         unsigned long           error_code;
  45                                                         /* debugging      */
  46         struct debug_info       debug;
  47 };
  48
  49 #define INIT_THREAD  {  }
  50
  51 #ifdef CONFIG_MMU
  52 #define nommu_start_thread(regs) do { } while (0)
  53 #else
  54 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
  55 #endif
  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         if (current->personality & ADDR_LIMIT_32BIT)                    \
  63                 regs->ARM_cpsr = USR_MODE;                              \
  64         else                                                            \
  65                 regs->ARM_cpsr = USR26_MODE;                            \
  66         if (elf_hwcap & HWCAP_THUMB && pc & 1)                          \
  67                 regs->ARM_cpsr |= PSR_T_BIT;                            \
  68         regs->ARM_pc = pc & ~1;         /* pc */                        \
  69         regs->ARM_sp = sp;              /* sp */                        \
  70         regs->ARM_r2 = stack[2];        /* r2 (envp) */                 \
  71         regs->ARM_r1 = stack[1];        /* r1 (argv) */                 \
  72         regs->ARM_r0 = stack[0];        /* r0 (argc) */                 \
  73         nommu_start_thread(regs);                                       \
  74 })
  75
  76 /* Forward declaration, a strange C thing */
  77 struct task_struct;
  78
  79 /* Free all resources held by a thread. */
  80 extern void release_thread(struct task_struct *);
  81
  82 /* Prepare to copy thread state - unlazy all lazy status */
  83 #define prepare_to_copy(tsk)    do { } while (0)
  84
  85 unsigned long get_wchan(struct task_struct *p);
  86
  87 #define cpu_relax()                     barrier()
  88
  89 /*
  90  * Create a new kernel thread
  91  */
  92 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  93
  94 #define task_pt_regs(p) \
  95         ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
  96
  97 #define KSTK_EIP(tsk)   task_pt_regs(tsk)->ARM_pc
  98 #define KSTK_ESP(tsk)   task_pt_regs(tsk)->ARM_sp
  99
 100 /*
 101  * Prefetching support - only ARMv5.
 102  */
 103 #if __LINUX_ARM_ARCH__ >= 5
 104
 105 #define ARCH_HAS_PREFETCH
 106 static inline void prefetch(const void *ptr)
 107 {
 108         __asm__ __volatile__(
 109                 "pld\t%0"
 110                 :
 111                 : "o" (*(char *)ptr)
 112                 : "cc");
 113 }
 114
 115 #define ARCH_HAS_PREFETCHW
 116 #define prefetchw(ptr)  prefetch(ptr)
 117
 118 #define ARCH_HAS_SPINLOCK_PREFETCH
 119 #define spin_lock_prefetch(x) do { } while (0)
 120
 121 #endif
 122
 123 #endif
 124
 125 #endif /* __ASM_ARM_PROCESSOR_H */