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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 #ifdef CONFIG_MMU
  53 #define nommu_start_thread(regs) do { } while (0)
  54 #else
  55 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
  56 #endif
  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         if (current->personality & ADDR_LIMIT_32BIT)                    \
  64                 regs->ARM_cpsr = USR_MODE;                              \
  65         else                                                            \
  66                 regs->ARM_cpsr = USR26_MODE;                            \
  67         if (elf_hwcap & HWCAP_THUMB && pc & 1)                          \
  68                 regs->ARM_cpsr |= PSR_T_BIT;                            \
  69         regs->ARM_pc = pc & ~1;         /* pc */                        \
  70         regs->ARM_sp = sp;              /* sp */                        \
  71         regs->ARM_r2 = stack[2];        /* r2 (envp) */                 \
  72         regs->ARM_r1 = stack[1];        /* r1 (argv) */                 \
  73         regs->ARM_r0 = stack[0];        /* r0 (argc) */                 \
  74         nommu_start_thread(regs);                                       \
  75 })
  76
  77 /* Forward declaration, a strange C thing */
  78 struct task_struct;
  79
  80 /* Free all resources held by a thread. */
  81 extern void release_thread(struct task_struct *);
  82
  83 /* Prepare to copy thread state - unlazy all lazy status */
  84 #define prepare_to_copy(tsk)    do { } while (0)
  85
  86 unsigned long get_wchan(struct task_struct *p);
  87
  88 #define cpu_relax()                     barrier()
  89
  90 /*
  91  * Create a new kernel thread
  92  */
  93 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  94
  95 #define task_pt_regs(p) \
  96         ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
  97
  98 #define KSTK_EIP(tsk)   task_pt_regs(tsk)->ARM_pc
  99 #define KSTK_ESP(tsk)   task_pt_regs(tsk)->ARM_sp
 100
 101 /*
 102  * Prefetching support - only ARMv5.
 103  */
 104 #if __LINUX_ARM_ARCH__ >= 5
 105
 106 #define ARCH_HAS_PREFETCH
 107 #define prefetch(ptr)                           \
 108         ({                                      \
 109                 __asm__ __volatile__(           \
 110                 "pld\t%0"                       \
 111                 :                               \
 112                 : "o" (*(char *)(ptr))          \
 113                 : "cc");                        \
 114         })
 115
 116 #define ARCH_HAS_PREFETCHW
 117 #define prefetchw(ptr)  prefetch(ptr)
 118
 119 #define ARCH_HAS_SPINLOCK_PREFETCH
 120 #define spin_lock_prefetch(x) do { } while (0)
 121
 122 #endif
 123
 124 #endif
 125
 126 #endif /* __ASM_ARM_PROCESSOR_H */