include/asm-frv/processor.h

   1 /* processor.h: FRV processor definitions
   2  *
   3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifndef _ASM_PROCESSOR_H
  13 #define _ASM_PROCESSOR_H
  14
  15 #include <linux/config.h>
  16 #include <asm/mem-layout.h>
  17
  18 #ifndef __ASSEMBLY__
  19 /*
  20  * Default implementation of macro that returns current
  21  * instruction pointer ("program counter").
  22  */
  23 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
  24
  25 #include <linux/linkage.h>
  26 #include <asm/sections.h>
  27 #include <asm/segment.h>
  28 #include <asm/fpu.h>
  29 #include <asm/registers.h>
  30 #include <asm/ptrace.h>
  31 #include <asm/current.h>
  32 #include <asm/cache.h>
  33
  34 /* Forward declaration, a strange C thing */
  35 struct task_struct;
  36
  37 /*
  38  *  CPU type and hardware bug flags. Kept separately for each CPU.
  39  */
  40 struct cpuinfo_frv {
  41 #ifdef CONFIG_MMU
  42         unsigned long   *pgd_quick;
  43         unsigned long   *pte_quick;
  44         unsigned long   pgtable_cache_sz;
  45 #endif
  46 } __cacheline_aligned;
  47
  48 extern struct cpuinfo_frv __nongprelbss boot_cpu_data;
  49
  50 #define cpu_data                (&boot_cpu_data)
  51 #define current_cpu_data        boot_cpu_data
  52
  53 /*
  54  * Bus types
  55  */
  56 #define EISA_bus 0
  57 #define MCA_bus 0
  58
  59 struct thread_struct {
  60         struct pt_regs          *frame;         /* [GR28] exception frame ptr for this thread */
  61         struct task_struct      *curr;          /* [GR29] current pointer for this thread */
  62         unsigned long           sp;             /* [GR1 ] kernel stack pointer */
  63         unsigned long           fp;             /* [GR2 ] kernel frame pointer */
  64         unsigned long           lr;             /* link register */
  65         unsigned long           pc;             /* program counter */
  66         unsigned long           gr[12];         /* [GR16-GR27] */
  67         unsigned long           sched_lr;       /* LR from schedule() */
  68
  69         union {
  70                 struct pt_regs          *frame0;        /* top (user) stack frame */
  71                 struct user_context     *user;          /* userspace context */
  72         };
  73 } __attribute__((aligned(8)));
  74
  75 extern struct pt_regs *__kernel_frame0_ptr;
  76 extern struct task_struct *__kernel_current_task;
  77
  78 #endif
  79
  80 #ifndef __ASSEMBLY__
  81 #define INIT_THREAD_FRAME0 \
  82         ((struct pt_regs *) \
  83         (sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))
  84
  85 #define INIT_THREAD {                           \
  86         NULL,                                   \
  87         (struct task_struct *) init_stack,      \
  88         0, 0, 0, 0,                             \
  89         { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
  90         0,                                      \
  91         { INIT_THREAD_FRAME0 },                 \
  92 }
  93
  94 /*
  95  * do necessary setup to start up a newly executed thread.
  96  * - need to discard the frame stacked by init() invoking the execve syscall
  97  */
  98 #define start_thread(_regs, _pc, _usp)                  \
  99 do {                                                    \
 100         set_fs(USER_DS); /* reads from user space */    \
 101         __frame = __kernel_frame0_ptr;                  \
 102         __frame->pc     = (_pc);                        \
 103         __frame->psr    &= ~PSR_S;                      \
 104         __frame->sp     = (_usp);                       \
 105 } while(0)
 106
 107 extern void prepare_to_copy(struct task_struct *tsk);
 108
 109 /* Free all resources held by a thread. */
 110 static inline void release_thread(struct task_struct *dead_task)
 111 {
 112 }
 113
 114 extern asmlinkage int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 115 extern asmlinkage void save_user_regs(struct user_context *target);
 116 extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
 117
 118 #define copy_segments(tsk, mm)          do { } while (0)
 119 #define release_segments(mm)            do { } while (0)
 120 #define forget_segments()               do { } while (0)
 121
 122 /*
 123  * Free current thread data structures etc..
 124  */
 125 static inline void exit_thread(void)
 126 {
 127 }
 128
 129 /*
 130  * Return saved PC of a blocked thread.
 131  */
 132 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 133
 134 unsigned long get_wchan(struct task_struct *p);
 135
 136 #define KSTK_EIP(tsk)   ((tsk)->thread.frame0->pc)
 137 #define KSTK_ESP(tsk)   ((tsk)->thread.frame0->sp)
 138
 139 /* Allocation and freeing of basic task resources. */
 140 extern struct task_struct *alloc_task_struct(void);
 141 extern void free_task_struct(struct task_struct *p);
 142
 143 #define cpu_relax()    do { } while (0)
 144
 145 /* data cache prefetch */
 146 #define ARCH_HAS_PREFETCH
 147 static inline void prefetch(const void *x)
 148 {
 149         asm volatile("dcpl %0,gr0,#0" : : "r"(x));
 150 }
 151
 152 #endif /* __ASSEMBLY__ */
 153 #endif /* _ASM_PROCESSOR_H */