LXR linux/arch/mn10300/include/asm/processor.h

   1/* MN10300 Processor specifics
   2 *
   3 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
   4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5 * Written by David Howells (dhowells@redhat.com)
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public Licence
   9 * as published by the Free Software Foundation; either version
  10 * 2 of the Licence, or (at your option) any later version.
  11 */
  12
  13#ifndef _ASM_PROCESSOR_H
  14#define _ASM_PROCESSOR_H
  15
  16#include <linux/threads.h>
  17#include <linux/thread_info.h>
  18#include <asm/page.h>
  19#include <asm/ptrace.h>
  20#include <asm/cpu-regs.h>
  21#include <asm/uaccess.h>
  22#include <asm/current.h>
  23
  24/* Forward declaration, a strange C thing */
  25struct task_struct;
  26struct mm_struct;
  27
  28/*
  29 * Default implementation of macro that returns current
  30 * instruction pointer ("program counter").
  31 */
  32#define current_text_addr()                     \
  33({                                              \
  34        void *__pc;                             \
  35        asm("mov pc,%0" : "=a"(__pc));          \
  36        __pc;                                   \
  37})
  38
  39extern void get_mem_info(unsigned long *mem_base, unsigned long *mem_size);
  40
  41extern void show_registers(struct pt_regs *regs);
  42
  43/*
  44 *  CPU type and hardware bug flags. Kept separately for each CPU.
  45 *  Members of this structure are referenced in head.S, so think twice
  46 *  before touching them. [mj]
  47 */
  48
  49struct mn10300_cpuinfo {
  50        int             type;
  51        unsigned long   loops_per_jiffy;
  52        char            hard_math;
  53};
  54
  55extern struct mn10300_cpuinfo boot_cpu_data;
  56
  57#ifdef CONFIG_SMP
  58#if CONFIG_NR_CPUS < 2 || CONFIG_NR_CPUS > 8
  59# error Sorry, NR_CPUS should be 2 to 8
  60#endif
  61extern struct mn10300_cpuinfo cpu_data[];
  62#define current_cpu_data cpu_data[smp_processor_id()]
  63#else  /* CONFIG_SMP */
  64#define cpu_data &boot_cpu_data
  65#define current_cpu_data boot_cpu_data
  66#endif /* CONFIG_SMP */
  67
  68extern void identify_cpu(struct mn10300_cpuinfo *);
  69extern void print_cpu_info(struct mn10300_cpuinfo *);
  70extern void dodgy_tsc(void);
  71#define cpu_relax() barrier()
  72
  73/*
  74 * User space process size: 1.75GB (default).
  75 */
  76#define TASK_SIZE               0x70000000
  77
  78/*
  79 * Where to put the userspace stack by default
  80 */
  81#define STACK_TOP               0x70000000
  82#define STACK_TOP_MAX           STACK_TOP
  83
  84/* This decides where the kernel will search for a free chunk of vm
  85 * space during mmap's.
  86 */
  87#define TASK_UNMAPPED_BASE      0x30000000
  88
  89struct fpu_state_struct {
  90        unsigned long   fs[32];         /* fpu registers */
  91        unsigned long   fpcr;           /* fpu control register */
  92};
  93
  94struct thread_struct {
  95        struct pt_regs          *uregs;         /* userspace register frame */
  96        unsigned long           pc;             /* kernel PC */
  97        unsigned long           sp;             /* kernel SP */
  98        unsigned long           a3;             /* kernel FP */
  99        unsigned long           wchan;
 100        unsigned long           usp;
 101        unsigned long           fpu_flags;
 102#define THREAD_USING_FPU        0x00000001      /* T if this task is using the FPU */
 103#define THREAD_HAS_FPU          0x00000002      /* T if this task owns the FPU right now */
 104        struct fpu_state_struct fpu_state;
 105};
 106
 107#define INIT_THREAD             \
 108{                               \
 109        .uregs  = init_uregs,   \
 110        .pc     = 0,            \
 111        .sp     = 0,            \
 112        .a3     = 0,            \
 113        .wchan  = 0,            \
 114}
 115
 116#define INIT_MMAP \
 117{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
 118  NULL, NULL }
 119
 120/*
 121 * do necessary setup to start up a newly executed thread
 122 */
 123static inline void start_thread(struct pt_regs *regs,
 124                                unsigned long new_pc, unsigned long new_sp)
 125{
 126        regs->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
 127        regs->pc = new_pc;
 128        regs->sp = new_sp;
 129}
 130
 131
 132/* Free all resources held by a thread. */
 133extern void release_thread(struct task_struct *);
 134
 135/*
 136 * Return saved PC of a blocked thread.
 137 */
 138extern unsigned long thread_saved_pc(struct task_struct *tsk);
 139
 140unsigned long get_wchan(struct task_struct *p);
 141
 142#define task_pt_regs(task) ((task)->thread.uregs)
 143#define KSTK_EIP(task) (task_pt_regs(task)->pc)
 144#define KSTK_ESP(task) (task_pt_regs(task)->sp)
 145
 146#define KSTK_TOP(info)                          \
 147({                                              \
 148        (unsigned long)(info) + THREAD_SIZE;    \
 149})
 150
 151#define ARCH_HAS_PREFETCH
 152#define ARCH_HAS_PREFETCHW
 153
 154static inline void prefetch(const void *x)
 155{
 156#ifdef CONFIG_MN10300_CACHE_ENABLED
 157#ifdef CONFIG_MN10300_PROC_MN103E010
 158        asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
 159#else
 160        asm volatile ("dcpf (%0)" : : "r"(x));
 161#endif
 162#endif
 163}
 164
 165static inline void prefetchw(const void *x)
 166{
 167#ifdef CONFIG_MN10300_CACHE_ENABLED
 168#ifdef CONFIG_MN10300_PROC_MN103E010
 169        asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
 170#else
 171        asm volatile ("dcpf (%0)" : : "r"(x));
 172#endif
 173#endif
 174}
 175
 176#endif /* _ASM_PROCESSOR_H */
 177