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 */
  25 struct task_struct;
  26 struct 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
  39 extern void get_mem_info(unsigned long *mem_base, unsigned long *mem_size);
  40
  41 extern 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
  49 struct mn10300_cpuinfo {
  50         int             type;
  51         unsigned long   loops_per_jiffy;
  52         char            hard_math;
  53 };
  54
  55 extern 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
  61 extern 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
  68 extern void identify_cpu(struct mn10300_cpuinfo *);
  69 extern void print_cpu_info(struct mn10300_cpuinfo *);
  70 extern void dodgy_tsc(void);
  71
  72 #define cpu_relax() barrier()
  73 #define cpu_relax_lowlatency() cpu_relax()
  74
  75 /*
  76  * User space process size: 1.75GB (default).
  77  */
  78 #define TASK_SIZE               0x70000000
  79
  80 /*
  81  * Where to put the userspace stack by default
  82  */
  83 #define STACK_TOP               0x70000000
  84 #define STACK_TOP_MAX           STACK_TOP
  85
  86 /* This decides where the kernel will search for a free chunk of vm
  87  * space during mmap's.
  88  */
  89 #define TASK_UNMAPPED_BASE      0x30000000
  90
  91 struct fpu_state_struct {
  92         unsigned long   fs[32];         /* fpu registers */
  93         unsigned long   fpcr;           /* fpu control register */
  94 };
  95
  96 struct thread_struct {
  97         struct pt_regs          *uregs;         /* userspace register frame */
  98         unsigned long           pc;             /* kernel PC */
  99         unsigned long           sp;             /* kernel SP */
 100         unsigned long           a3;             /* kernel FP */
 101         unsigned long           wchan;
 102         unsigned long           usp;
 103         unsigned long           fpu_flags;
 104 #define THREAD_USING_FPU        0x00000001      /* T if this task is using the FPU */
 105 #define THREAD_HAS_FPU          0x00000002      /* T if this task owns the FPU right now */
 106         struct fpu_state_struct fpu_state;
 107 };
 108
 109 #define INIT_THREAD             \
 110 {                               \
 111         .uregs  = init_uregs,   \
 112         .pc     = 0,            \
 113         .sp     = 0,            \
 114         .a3     = 0,            \
 115         .wchan  = 0,            \
 116 }
 117
 118 #define INIT_MMAP \
 119 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
 120   NULL, NULL }
 121
 122 /*
 123  * do necessary setup to start up a newly executed thread
 124  */
 125 static inline void start_thread(struct pt_regs *regs,
 126                                 unsigned long new_pc, unsigned long new_sp)
 127 {
 128         regs->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;
 129         regs->pc = new_pc;
 130         regs->sp = new_sp;
 131 }
 132
 133
 134 /* Free all resources held by a thread. */
 135 extern void release_thread(struct task_struct *);
 136
 137 /*
 138  * Return saved PC of a blocked thread.
 139  */
 140 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 141
 142 unsigned long get_wchan(struct task_struct *p);
 143
 144 #define task_pt_regs(task) ((task)->thread.uregs)
 145 #define KSTK_EIP(task) (task_pt_regs(task)->pc)
 146 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
 147
 148 #define KSTK_TOP(info)                          \
 149 ({                                              \
 150         (unsigned long)(info) + THREAD_SIZE;    \
 151 })
 152
 153 #define ARCH_HAS_PREFETCH
 154 #define ARCH_HAS_PREFETCHW
 155
 156 static inline void prefetch(const void *x)
 157 {
 158 #ifdef CONFIG_MN10300_CACHE_ENABLED
 159 #ifdef CONFIG_MN10300_PROC_MN103E010
 160         asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
 161 #else
 162         asm volatile ("dcpf (%0)" : : "r"(x));
 163 #endif
 164 #endif
 165 }
 166
 167 static inline void prefetchw(const void *x)
 168 {
 169 #ifdef CONFIG_MN10300_CACHE_ENABLED
 170 #ifdef CONFIG_MN10300_PROC_MN103E010
 171         asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
 172 #else
 173         asm volatile ("dcpf (%0)" : : "r"(x));
 174 #endif
 175 #endif
 176 }
 177
 178 #endif /* _ASM_PROCESSOR_H */