arch/arm/include/asm/processor.h

   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/hw_breakpoint.h>
  23 #include <asm/ptrace.h>
  24 #include <asm/types.h>
  25
  26 #ifdef __KERNEL__
  27 #define STACK_TOP       ((current->personality & ADDR_LIMIT_32BIT) ? \
  28                          TASK_SIZE : TASK_SIZE_26)
  29 #define STACK_TOP_MAX   TASK_SIZE
  30 #endif
  31
  32 union debug_insn {
  33         u32     arm;
  34         u16     thumb;
  35 };
  36
  37 struct debug_entry {
  38         u32                     address;
  39         union debug_insn        insn;
  40 };
  41
  42 struct debug_info {
  43         int                     nsaved;
  44         struct debug_entry      bp[2];
  45 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  46         struct perf_event       *hbp[ARM_MAX_HBP_SLOTS];
  47 #endif
  48 };
  49
  50 struct thread_struct {
  51                                                         /* fault info     */
  52         unsigned long           address;
  53         unsigned long           trap_no;
  54         unsigned long           error_code;
  55                                                         /* debugging      */
  56         struct debug_info       debug;
  57 };
  58
  59 #define INIT_THREAD  {  }
  60
  61 #ifdef CONFIG_MMU
  62 #define nommu_start_thread(regs) do { } while (0)
  63 #else
  64 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
  65 #endif
  66
  67 #define start_thread(regs,pc,sp)                                        \
  68 ({                                                                      \
  69         unsigned long *stack = (unsigned long *)sp;                     \
  70         set_fs(USER_DS);                                                \
  71         memset(regs->uregs, 0, sizeof(regs->uregs));                    \
  72         if (current->personality & ADDR_LIMIT_32BIT)                    \
  73                 regs->ARM_cpsr = USR_MODE;                              \
  74         else                                                            \
  75                 regs->ARM_cpsr = USR26_MODE;                            \
  76         if (elf_hwcap & HWCAP_THUMB && pc & 1)                          \
  77                 regs->ARM_cpsr |= PSR_T_BIT;                            \
  78         regs->ARM_cpsr |= PSR_ENDSTATE;                                 \
  79         regs->ARM_pc = pc & ~1;         /* pc */                        \
  80         regs->ARM_sp = sp;              /* sp */                        \
  81         regs->ARM_r2 = stack[2];        /* r2 (envp) */                 \
  82         regs->ARM_r1 = stack[1];        /* r1 (argv) */                 \
  83         regs->ARM_r0 = stack[0];        /* r0 (argc) */                 \
  84         nommu_start_thread(regs);                                       \
  85 })
  86
  87 /* Forward declaration, a strange C thing */
  88 struct task_struct;
  89
  90 /* Free all resources held by a thread. */
  91 extern void release_thread(struct task_struct *);
  92
  93 /* Prepare to copy thread state - unlazy all lazy status */
  94 #define prepare_to_copy(tsk)    do { } while (0)
  95
  96 unsigned long get_wchan(struct task_struct *p);
  97
  98 #if __LINUX_ARM_ARCH__ == 6
  99 #define cpu_relax()                     smp_mb()
 100 #else
 101 #define cpu_relax()                     barrier()
 102 #endif
 103
 104 /*
 105  * Create a new kernel thread
 106  */
 107 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 108
 109 #define task_pt_regs(p) \
 110         ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
 111
 112 #define KSTK_EIP(tsk)   task_pt_regs(tsk)->ARM_pc
 113 #define KSTK_ESP(tsk)   task_pt_regs(tsk)->ARM_sp
 114
 115 /*
 116  * Prefetching support - only ARMv5.
 117  */
 118 #if __LINUX_ARM_ARCH__ >= 5
 119
 120 #define ARCH_HAS_PREFETCH
 121 static inline void prefetch(const void *ptr)
 122 {
 123         __asm__ __volatile__(
 124                 "pld\t%a0"
 125                 :
 126                 : "p" (ptr)
 127                 : "cc");
 128 }
 129
 130 #define ARCH_HAS_PREFETCHW
 131 #define prefetchw(ptr)  prefetch(ptr)
 132
 133 #define ARCH_HAS_SPINLOCK_PREFETCH
 134 #define spin_lock_prefetch(x) do { } while (0)
 135
 136 #endif
 137
 138 #endif
 139
 140 #endif /* __ASM_ARM_PROCESSOR_H */