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   1 /*
   2  *  arch/arm/include/asm/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 #ifdef __KERNEL__
  26 #define STACK_TOP       ((current->personality & ADDR_LIMIT_32BIT) ? \
  27                          TASK_SIZE : TASK_SIZE_26)
  28 #define STACK_TOP_MAX   TASK_SIZE
  29 #endif
  30
  31 union debug_insn {
  32         u32     arm;
  33         u16     thumb;
  34 };
  35
  36 struct debug_entry {
  37         u32                     address;
  38         union debug_insn        insn;
  39 };
  40
  41 struct debug_info {
  42         int                     nsaved;
  43         struct debug_entry      bp[2];
  44 };
  45
  46 struct thread_struct {
  47                                                         /* fault info     */
  48         unsigned long           address;
  49         unsigned long           trap_no;
  50         unsigned long           error_code;
  51                                                         /* debugging      */
  52         struct debug_info       debug;
  53 };
  54
  55 #define INIT_THREAD  {  }
  56
  57 #ifdef CONFIG_MMU
  58 #define nommu_start_thread(regs) do { } while (0)
  59 #else
  60 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
  61 #endif
  62
  63 #define start_thread(regs,pc,sp)                                        \
  64 ({                                                                      \
  65         unsigned long *stack = (unsigned long *)sp;                     \
  66         set_fs(USER_DS);                                                \
  67         memzero(regs->uregs, sizeof(regs->uregs));                      \
  68         if (current->personality & ADDR_LIMIT_32BIT)                    \
  69                 regs->ARM_cpsr = USR_MODE;                              \
  70         else                                                            \
  71                 regs->ARM_cpsr = USR26_MODE;                            \
  72         if (elf_hwcap & HWCAP_THUMB && pc & 1)                          \
  73                 regs->ARM_cpsr |= PSR_T_BIT;                            \
  74         regs->ARM_pc = pc & ~1;         /* pc */                        \
  75         regs->ARM_sp = sp;              /* sp */                        \
  76         regs->ARM_r2 = stack[2];        /* r2 (envp) */                 \
  77         regs->ARM_r1 = stack[1];        /* r1 (argv) */                 \
  78         regs->ARM_r0 = stack[0];        /* r0 (argc) */                 \
  79         nommu_start_thread(regs);                                       \
  80 })
  81
  82 /* Forward declaration, a strange C thing */
  83 struct task_struct;
  84
  85 /* Free all resources held by a thread. */
  86 extern void release_thread(struct task_struct *);
  87
  88 /* Prepare to copy thread state - unlazy all lazy status */
  89 #define prepare_to_copy(tsk)    do { } while (0)
  90
  91 unsigned long get_wchan(struct task_struct *p);
  92
  93 #define cpu_relax()                     barrier()
  94
  95 /*
  96  * Create a new kernel thread
  97  */
  98 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  99
 100 #define task_pt_regs(p) \
 101         ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
 102
 103 #define KSTK_EIP(tsk)   task_pt_regs(tsk)->ARM_pc
 104 #define KSTK_ESP(tsk)   task_pt_regs(tsk)->ARM_sp
 105
 106 /*
 107  * Prefetching support - only ARMv5.
 108  */
 109 #if __LINUX_ARM_ARCH__ >= 5
 110
 111 #define ARCH_HAS_PREFETCH
 112 static inline void prefetch(const void *ptr)
 113 {
 114         __asm__ __volatile__(
 115                 "pld\t%a0"
 116                 :
 117                 : "p" (ptr)
 118                 : "cc");
 119 }
 120
 121 #define ARCH_HAS_PREFETCHW
 122 #define prefetchw(ptr)  prefetch(ptr)
 123
 124 #define ARCH_HAS_SPINLOCK_PREFETCH
 125 #define spin_lock_prefetch(x) do { } while (0)
 126
 127 #endif
 128
 129 #endif
 130
 131 #endif /* __ASM_ARM_PROCESSOR_H */