arch/um/include/asm/processor-generic.h

   1 /*
   2  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __UM_PROCESSOR_GENERIC_H
   7 #define __UM_PROCESSOR_GENERIC_H
   8
   9 struct pt_regs;
  10
  11 struct task_struct;
  12
  13 #include <asm/ptrace.h>
  14 #include <registers.h>
  15 #include <sysdep/archsetjmp.h>
  16
  17 #include <linux/prefetch.h>
  18
  19 struct mm_struct;
  20
  21 struct thread_struct {
  22         struct task_struct *saved_task;
  23         struct pt_regs regs;
  24         int singlestep_syscall;
  25         void *fault_addr;
  26         jmp_buf *fault_catcher;
  27         struct task_struct *prev_sched;
  28         unsigned long temp_stack;
  29         struct arch_thread arch;
  30         jmp_buf switch_buf;
  31         int mm_count;
  32         struct {
  33                 int op;
  34                 union {
  35                         struct {
  36                                 int pid;
  37                         } fork, exec;
  38                         struct {
  39                                 int (*proc)(void *);
  40                                 void *arg;
  41                         } thread;
  42                         struct {
  43                                 void (*proc)(void *);
  44                                 void *arg;
  45                         } cb;
  46                 } u;
  47         } request;
  48 };
  49
  50 #define INIT_THREAD \
  51 { \
  52         .regs                   = EMPTY_REGS,   \
  53         .fault_addr             = NULL, \
  54         .prev_sched             = NULL, \
  55         .temp_stack             = 0, \
  56         .arch                   = INIT_ARCH_THREAD, \
  57         .request                = { 0 } \
  58 }
  59
  60 static inline void release_thread(struct task_struct *task)
  61 {
  62 }
  63
  64 extern unsigned long thread_saved_pc(struct task_struct *t);
  65
  66 static inline void mm_copy_segments(struct mm_struct *from_mm,
  67                                     struct mm_struct *new_mm)
  68 {
  69 }
  70
  71 #define init_stack      (init_thread_union.stack)
  72
  73 /*
  74  * User space process size: 3GB (default).
  75  */
  76 extern unsigned long task_size;
  77
  78 #define TASK_SIZE (task_size)
  79
  80 #undef STACK_TOP
  81 #undef STACK_TOP_MAX
  82
  83 extern unsigned long stacksizelim;
  84
  85 #define STACK_ROOM      (stacksizelim)
  86 #define STACK_TOP       (TASK_SIZE - 2 * PAGE_SIZE)
  87 #define STACK_TOP_MAX   STACK_TOP
  88
  89 /* This decides where the kernel will search for a free chunk of vm
  90  * space during mmap's.
  91  */
  92 #define TASK_UNMAPPED_BASE      (0x40000000)
  93
  94 extern void start_thread(struct pt_regs *regs, unsigned long entry,
  95                          unsigned long stack);
  96
  97 struct cpuinfo_um {
  98         unsigned long loops_per_jiffy;
  99         int ipi_pipe[2];
 100 };
 101
 102 extern struct cpuinfo_um boot_cpu_data;
 103
 104 #define my_cpu_data             cpu_data[smp_processor_id()]
 105
 106 #ifdef CONFIG_SMP
 107 extern struct cpuinfo_um cpu_data[];
 108 #define current_cpu_data cpu_data[smp_processor_id()]
 109 #else
 110 #define cpu_data (&boot_cpu_data)
 111 #define current_cpu_data boot_cpu_data
 112 #endif
 113
 114
 115 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
 116 extern unsigned long get_wchan(struct task_struct *p);
 117
 118 #endif