include/asm-mn10300/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 <asm/page.h>
  17 #include <asm/ptrace.h>
  18 #include <asm/cpu-regs.h>
  19 #include <linux/threads.h>
  20
  21 /* Forward declaration, a strange C thing */
  22 struct task_struct;
  23 struct mm_struct;
  24
  25 /*
  26  * Default implementation of macro that returns current
  27  * instruction pointer ("program counter").
  28  */
  29 #define current_text_addr()                     \
  30 ({                                              \
  31         void *__pc;                             \
  32         asm("mov pc,%0" : "=a"(__pc));          \
  33         __pc;                                   \
  34 })
  35
  36 extern void show_registers(struct pt_regs *regs);
  37
  38 /*
  39  *  CPU type and hardware bug flags. Kept separately for each CPU.
  40  *  Members of this structure are referenced in head.S, so think twice
  41  *  before touching them. [mj]
  42  */
  43
  44 struct mn10300_cpuinfo {
  45         int             type;
  46         unsigned long   loops_per_sec;
  47         char            hard_math;
  48         unsigned long   *pgd_quick;
  49         unsigned long   *pte_quick;
  50         unsigned long   pgtable_cache_sz;
  51 };
  52
  53 extern struct mn10300_cpuinfo boot_cpu_data;
  54
  55 #define cpu_data &boot_cpu_data
  56 #define current_cpu_data boot_cpu_data
  57
  58 extern void identify_cpu(struct mn10300_cpuinfo *);
  59 extern void print_cpu_info(struct mn10300_cpuinfo *);
  60 extern void dodgy_tsc(void);
  61 #define cpu_relax() barrier()
  62
  63 /*
  64  * User space process size: 1.75GB (default).
  65  */
  66 #define TASK_SIZE               0x70000000
  67
  68 /*
  69  * Where to put the userspace stack by default
  70  */
  71 #define STACK_TOP               0x70000000
  72 #define STACK_TOP_MAX           STACK_TOP
  73
  74 /* This decides where the kernel will search for a free chunk of vm
  75  * space during mmap's.
  76  */
  77 #define TASK_UNMAPPED_BASE      0x30000000
  78
  79 typedef struct {
  80         unsigned long   seg;
  81 } mm_segment_t;
  82
  83 struct fpu_state_struct {
  84         unsigned long   fs[32];         /* fpu registers */
  85         unsigned long   fpcr;           /* fpu control register */
  86 };
  87
  88 struct thread_struct {
  89         struct pt_regs          *uregs;         /* userspace register frame */
  90         unsigned long           pc;             /* kernel PC */
  91         unsigned long           sp;             /* kernel SP */
  92         unsigned long           a3;             /* kernel FP */
  93         unsigned long           wchan;
  94         unsigned long           usp;
  95         struct pt_regs          *__frame;
  96         unsigned long           fpu_flags;
  97 #define THREAD_USING_FPU        0x00000001      /* T if this task is using the FPU */
  98         struct fpu_state_struct fpu_state;
  99 };
 100
 101 #define INIT_THREAD                             \
 102 {                                               \
 103         .uregs          = init_uregs,           \
 104         .pc             = 0,                    \
 105         .sp             = 0,                    \
 106         .a3             = 0,                    \
 107         .wchan          = 0,                    \
 108         .__frame        = NULL,                 \
 109 }
 110
 111 #define INIT_MMAP \
 112 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, \
 113   NULL, NULL }
 114
 115 /*
 116  * do necessary setup to start up a newly executed thread
 117  * - need to discard the frame stacked by the kernel thread invoking the execve
 118  *   syscall (see RESTORE_ALL macro)
 119  */
 120 #define start_thread(regs, new_pc, new_sp) do {         \
 121         set_fs(USER_DS);                                \
 122         __frame = current->thread.uregs;                \
 123         __frame->epsw = EPSW_nSL | EPSW_IE | EPSW_IM;   \
 124         __frame->pc = new_pc;                           \
 125         __frame->sp = new_sp;                           \
 126 } while (0)
 127
 128 /* Free all resources held by a thread. */
 129 extern void release_thread(struct task_struct *);
 130
 131 /* Prepare to copy thread state - unlazy all lazy status */
 132 extern void prepare_to_copy(struct task_struct *tsk);
 133
 134 /*
 135  * create a kernel thread without removing it from tasklists
 136  */
 137 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 138
 139 /*
 140  * Return saved PC of a blocked thread.
 141  */
 142 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 143
 144 unsigned long get_wchan(struct task_struct *p);
 145
 146 #define task_pt_regs(task)                                              \
 147 ({                                                                      \
 148        struct pt_regs *__regs__;                                        \
 149        __regs__ = (struct pt_regs *) (KSTK_TOP(task_stack_page(task)) - 8); \
 150        __regs__ - 1;                                                    \
 151 })
 152
 153 #define KSTK_EIP(task) (task_pt_regs(task)->pc)
 154 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
 155
 156 #define KSTK_TOP(info)                          \
 157 ({                                              \
 158         (unsigned long)(info) + THREAD_SIZE;    \
 159 })
 160
 161 #define ARCH_HAS_PREFETCH
 162 #define ARCH_HAS_PREFETCHW
 163
 164 static inline void prefetch(const void *x)
 165 {
 166 #ifndef CONFIG_MN10300_CACHE_DISABLED
 167 #ifdef CONFIG_MN10300_PROC_MN103E010
 168         asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
 169 #else
 170         asm volatile ("dcpf (%0)" : : "r"(x));
 171 #endif
 172 #endif
 173 }
 174
 175 static inline void prefetchw(const void *x)
 176 {
 177 #ifndef CONFIG_MN10300_CACHE_DISABLED
 178 #ifdef CONFIG_MN10300_PROC_MN103E010
 179         asm volatile ("nop; nop; dcpf (%0)" : : "r"(x));
 180 #else
 181         asm volatile ("dcpf (%0)" : : "r"(x));
 182 #endif
 183 #endif
 184 }
 185
 186 #endif /* _ASM_PROCESSOR_H */