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 pt_regs regs;
  23         struct pt_regs *segv_regs;
  24         int singlestep_syscall;
  25         void *fault_addr;
  26         jmp_buf *fault_catcher;
  27         struct task_struct *prev_sched;
  28         struct arch_thread arch;
  29         jmp_buf switch_buf;
  30         struct {
  31                 int op;
  32                 union {
  33                         struct {
  34                                 int pid;
  35                         } fork, exec;
  36                         struct {
  37                                 int (*proc)(void *);
  38                                 void *arg;
  39                         } thread;
  40                         struct {
  41                                 void (*proc)(void *);
  42                                 void *arg;
  43                         } cb;
  44                 } u;
  45         } request;
  46 };
  47
  48 #define INIT_THREAD \
  49 { \
  50         .regs                   = EMPTY_REGS,   \
  51         .fault_addr             = NULL, \
  52         .prev_sched             = NULL, \
  53         .arch                   = INIT_ARCH_THREAD, \
  54         .request                = { 0 } \
  55 }
  56
  57 static inline void release_thread(struct task_struct *task)
  58 {
  59 }
  60
  61 extern unsigned long thread_saved_pc(struct task_struct *t);
  62
  63 static inline void mm_copy_segments(struct mm_struct *from_mm,
  64                                     struct mm_struct *new_mm)
  65 {
  66 }
  67
  68 #define init_stack      (init_thread_union.stack)
  69
  70 /*
  71  * User space process size: 3GB (default).
  72  */
  73 extern unsigned long task_size;
  74
  75 #define TASK_SIZE (task_size)
  76
  77 #undef STACK_TOP
  78 #undef STACK_TOP_MAX
  79
  80 extern unsigned long stacksizelim;
  81
  82 #define STACK_ROOM      (stacksizelim)
  83 #define STACK_TOP       (TASK_SIZE - 2 * PAGE_SIZE)
  84 #define STACK_TOP_MAX   STACK_TOP
  85
  86 /* This decides where the kernel will search for a free chunk of vm
  87  * space during mmap's.
  88  */
  89 #define TASK_UNMAPPED_BASE      (0x40000000)
  90
  91 extern void start_thread(struct pt_regs *regs, unsigned long entry,
  92                          unsigned long stack);
  93
  94 struct cpuinfo_um {
  95         unsigned long loops_per_jiffy;
  96         int ipi_pipe[2];
  97 };
  98
  99 extern struct cpuinfo_um boot_cpu_data;
 100
 101 #define cpu_data (&boot_cpu_data)
 102 #define current_cpu_data boot_cpu_data
 103
 104 #define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
 105 extern unsigned long get_wchan(struct task_struct *p);
 106
 107 #endif