arch/m32r/include/asm/processor.h

   1 #ifndef _ASM_M32R_PROCESSOR_H
   2 #define _ASM_M32R_PROCESSOR_H
   3
   4 /*
   5  * include/asm-m32r/processor.h
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  *
  11  * Copyright (C) 1994  Linus Torvalds
  12  * Copyright (C) 2001  Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto
  13  * Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <asm/cache.h>
  18 #include <asm/ptrace.h>  /* pt_regs */
  19
  20 /*
  21  * Default implementation of macro that returns current
  22  * instruction pointer ("program counter").
  23  */
  24 #define current_text_addr() ({ __label__ _l; _l: &&_l; })
  25
  26 /*
  27  *  CPU type and hardware bug flags. Kept separately for each CPU.
  28  *  Members of this structure are referenced in head.S, so think twice
  29  *  before touching them. [mj]
  30  */
  31
  32 struct cpuinfo_m32r {
  33         unsigned long pgtable_cache_sz;
  34         unsigned long cpu_clock;
  35         unsigned long bus_clock;
  36         unsigned long timer_divide;
  37         unsigned long loops_per_jiffy;
  38 };
  39
  40 /*
  41  * capabilities of CPUs
  42  */
  43
  44 extern struct cpuinfo_m32r boot_cpu_data;
  45
  46 #ifdef CONFIG_SMP
  47 extern struct cpuinfo_m32r cpu_data[];
  48 #define current_cpu_data cpu_data[smp_processor_id()]
  49 #else
  50 #define cpu_data (&boot_cpu_data)
  51 #define current_cpu_data boot_cpu_data
  52 #endif
  53
  54 /*
  55  * User space process size: 2GB (default).
  56  */
  57 #ifdef CONFIG_MMU
  58 #define TASK_SIZE  (0x80000000UL)
  59 #else
  60 #define TASK_SIZE  (0x00400000UL)
  61 #endif
  62
  63 #ifdef __KERNEL__
  64 #define STACK_TOP       TASK_SIZE
  65 #define STACK_TOP_MAX   STACK_TOP
  66 #endif
  67
  68 /* This decides where the kernel will search for a free chunk of vm
  69  * space during mmap's.
  70  */
  71 #define TASK_UNMAPPED_BASE      PAGE_ALIGN(TASK_SIZE / 3)
  72
  73 typedef struct {
  74         unsigned long seg;
  75 } mm_segment_t;
  76
  77 #define MAX_TRAPS 10
  78
  79 struct debug_trap {
  80         int nr_trap;
  81         unsigned long   addr[MAX_TRAPS];
  82         unsigned long   insn[MAX_TRAPS];
  83 };
  84
  85 struct thread_struct {
  86         unsigned long address;
  87         unsigned long trap_no;          /* Trap number  */
  88         unsigned long error_code;       /* Error code of trap */
  89         unsigned long lr;               /* saved pc */
  90         unsigned long sp;               /* user stack pointer */
  91         struct debug_trap debug_trap;
  92 };
  93
  94 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
  95
  96 #define INIT_THREAD     {       \
  97         .sp = INIT_SP,          \
  98 }
  99
 100 /*
 101  * Do necessary setup to start up a newly executed thread.
 102  */
 103
 104 /* User process Backup PSW */
 105 #define USERPS_BPSW (M32R_PSW_BSM|M32R_PSW_BIE|M32R_PSW_BPM)
 106
 107 #define start_thread(regs, new_pc, new_spu)                             \
 108         do {                                                            \
 109                 regs->psw = (regs->psw | USERPS_BPSW) & 0x0000FFFFUL;   \
 110                 regs->bpc = new_pc;                                     \
 111                 regs->spu = new_spu;                                    \
 112         } while (0)
 113
 114 /* Forward declaration, a strange C thing */
 115 struct task_struct;
 116 struct mm_struct;
 117
 118 /* Free all resources held by a thread. */
 119 extern void release_thread(struct task_struct *);
 120
 121 #define prepare_to_copy(tsk)    do { } while (0)
 122
 123 /*
 124  * create a kernel thread without removing it from tasklists
 125  */
 126 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 127
 128 /* Copy and release all segment info associated with a VM */
 129 extern void copy_segments(struct task_struct *p, struct mm_struct * mm);
 130 extern void release_segments(struct mm_struct * mm);
 131
 132 extern unsigned long thread_saved_pc(struct task_struct *);
 133
 134 /* Copy and release all segment info associated with a VM */
 135 #define copy_segments(p, mm)  do { } while (0)
 136 #define release_segments(mm)  do { } while (0)
 137
 138 unsigned long get_wchan(struct task_struct *p);
 139 #define KSTK_EIP(tsk)  ((tsk)->thread.lr)
 140 #define KSTK_ESP(tsk)  ((tsk)->thread.sp)
 141
 142 #define cpu_relax()     barrier()
 143
 144 #endif /* _ASM_M32R_PROCESSOR_H */