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