LXR linux/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
  32struct debug_info {
  33#ifdef CONFIG_HAVE_HW_BREAKPOINT
  34        struct perf_event       *hbp[ARM_MAX_HBP_SLOTS];
  35#endif
  36};
  37
  38struct thread_struct {
  39                                                        /* fault info     */
  40        unsigned long           address;
  41        unsigned long           trap_no;
  42        unsigned long           error_code;
  43                                                        /* debugging      */
  44        struct debug_info       debug;
  45};
  46
  47#define INIT_THREAD  {  }
  48
  49#ifdef CONFIG_MMU
  50#define nommu_start_thread(regs) do { } while (0)
  51#else
  52#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
  53#endif
  54
  55#define start_thread(regs,pc,sp)                                        \
  56({                                                                      \
  57        unsigned long *stack = (unsigned long *)sp;                     \
  58        memset(regs->uregs, 0, sizeof(regs->uregs));                    \
  59        if (current->personality & ADDR_LIMIT_32BIT)                    \
  60                regs->ARM_cpsr = USR_MODE;                              \
  61        else                                                            \
  62                regs->ARM_cpsr = USR26_MODE;                            \
  63        if (elf_hwcap & HWCAP_THUMB && pc & 1)                          \
  64                regs->ARM_cpsr |= PSR_T_BIT;                            \
  65        regs->ARM_cpsr |= PSR_ENDSTATE;                                 \
  66        regs->ARM_pc = pc & ~1;         /* pc */                        \
  67        regs->ARM_sp = sp;              /* sp */                        \
  68        regs->ARM_r2 = stack[2];        /* r2 (envp) */                 \
  69        regs->ARM_r1 = stack[1];        /* r1 (argv) */                 \
  70        regs->ARM_r0 = stack[0];        /* r0 (argc) */                 \
  71        nommu_start_thread(regs);                                       \
  72})
  73
  74/* Forward declaration, a strange C thing */
  75struct task_struct;
  76
  77/* Free all resources held by a thread. */
  78extern void release_thread(struct task_struct *);
  79
  80unsigned long get_wchan(struct task_struct *p);
  81
  82#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
  83#define cpu_relax()                     smp_mb()
  84#else
  85#define cpu_relax()                     barrier()
  86#endif
  87
  88/*
  89 * Create a new kernel thread
  90 */
  91extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  92
  93#define task_pt_regs(p) \
  94        ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
  95
  96#define KSTK_EIP(tsk)   task_pt_regs(tsk)->ARM_pc
  97#define KSTK_ESP(tsk)   task_pt_regs(tsk)->ARM_sp
  98
  99/*
 100 * Prefetching support - only ARMv5.
 101 */
 102#if __LINUX_ARM_ARCH__ >= 5
 103
 104#define ARCH_HAS_PREFETCH
 105static inline void prefetch(const void *ptr)
 106{
 107        __asm__ __volatile__(
 108                "pld\t%a0"
 109                :
 110                : "p" (ptr)
 111                : "cc");
 112}
 113
 114#define ARCH_HAS_PREFETCHW
 115#define prefetchw(ptr)  prefetch(ptr)
 116
 117#define ARCH_HAS_SPINLOCK_PREFETCH
 118#define spin_lock_prefetch(x) do { } while (0)
 119
 120#endif
 121
 122#define HAVE_ARCH_PICK_MMAP_LAYOUT
 123
 124#endif
 125
 126#endif /* __ASM_ARM_PROCESSOR_H */
 127