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 #define MCA_bus 0
  23 #define MCA_bus__is_a_macro
  24
  25 #include <asm/atomic.h>
  26 #include <asm/ptrace.h>
  27 #include <asm/procinfo.h>
  28 #include <asm/types.h>
  29
  30 #define KERNEL_STACK_SIZE       PAGE_SIZE
  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 };
  46
  47 struct thread_struct {
  48                                                         /* fault info     */
  49         unsigned long           address;
  50         unsigned long           trap_no;
  51         unsigned long           error_code;
  52                                                         /* debugging      */
  53         struct debug_info       debug;
  54 };
  55
  56 #define INIT_THREAD  {  }
  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 })
  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 KSTK_EIP(tsk)   (((unsigned long *)(4096+(unsigned long)(tsk)->thread_info))[1019])
  95 #define KSTK_ESP(tsk)   (((unsigned long *)(4096+(unsigned long)(tsk)->thread_info))[1017])
  96
  97 /*
  98  * Prefetching support - only ARMv5.
  99  */
 100 #if __LINUX_ARM_ARCH__ >= 5
 101
 102 #define ARCH_HAS_PREFETCH
 103 #define prefetch(ptr)                           \
 104         ({                                      \
 105                 __asm__ __volatile__(           \
 106                 "pld\t%0"                       \
 107                 :                               \
 108                 : "o" (*(char *)(ptr))          \
 109                 : "cc");                        \
 110         })
 111
 112 #define ARCH_HAS_PREFETCHW
 113 #define prefetchw(ptr)  prefetch(ptr)
 114
 115 #define ARCH_HAS_SPINLOCK_PREFETCH
 116 #define spin_lock_prefetch(x) do { } while (0)
 117
 118 #endif
 119
 120 #endif
 121
 122 #endif /* __ASM_ARM_PROCESSOR_H */